More about Flood Maps

I’ve been getting a lot of questions about my Flood Maps web-site. Here’s a compilation of all the thing’s I’ve had to say about them so far.

The questions are from Pierre Grumberg of Emap France.

How did you make the maps?

It breaks down into two parts:

The website needs to be put together using Google’s mapping API. That was a little bit of a challenge because I was trying to stretch Google’s code a bit further than was intended. However there are plenty of people who’ve done already done similar things, so most of the problems had already been solved by someone, somewhere on the Internet. Google have since brought out version 2 of their API, which makes doing the same thing much easier.

The harder part was writing a tile server, to feed the website with graphic files such as this one: link

The raw data from NASA is 50Gb. A complete set of tiles for Google Maps needs 22,906,492,245 files. I need 15 sets of tiles for the 15 different flood levels, which comes to 343,597,383,675 files!! I only have limited disk space, so I wrote a tile server in C++ that would generate tile files on demand, and then cache them.

I cut down NASA’s data so that each datapoint fits into 4 bits, rather than the original 16 – that’s where the limit of 0-14m comes from. 15 levels of elevation, and one extra for “NO DATA”.

The calculation of each tile is quite simple. If that coordinate is at the given level or below, then the tile is coloured blue, otherwise it is left transparent. There’s a slight cheat for areas of the world that are currently below sea level (large parts of the Netherlands for example)… Such areas are actually listed as +1m in my data files, so they appear dry at +0 metres, but flooded for any other value. Areas that are naturally at exactly sea-level are always coloured blue regardless, that’s why this map of England’s fen-land is peppered with blue, even at +0m: fenland at +0m

I chose to use a rather unpleasant ‘chequerboard’ pattern for the translucent blue areas of the tiles. That’s because it maximises compatibility with less capable browsers, especially Internet Explorer. An alpha channel would have made the images prettier, but only on better browsers, such as Firefox or Safari.

And is it really accurate ?

There are a number of significant sources of inaccuracy. All of these inaccuracies are optimistic – correcting the inaccuracy would make the consequences of sea level rise look worse. I’ve made a conscious effort to avoid ad hoc corrections for these effects. If these maps have a purpose, it is to encourage the general public to consider the consequences of global warming. If I were to make corrections that make more bits of the map shaded blue, then I would run the risk of having the whole thing discredited as alarmist.

Firstly, the model knows nothing about the tides. Since tidal variation can be 10m or more in some parts of the world, this is a major deficiency.

Secondly, the NASA data itself is not very accurate. Jonathon Stott has said that “NASA claims their height data is accurate to +/- 16m with 90% certainty”. NASA gathered the data by radar from orbit, so buildings and trees cause a systematic overestimation of the elevation of built-up and forested areas.

Thirdly, the NASA data does not extend beyond +/-60 degrees latitude. Its accuracy becomes degraded at the extremes of its range, especially in the Southern hemisphere, I am told.

Fourthly, the simulation takes no account of the effects of coastal erosion. I believe that anywhere within a metre or so of daily maximum sea level would be swiftly eroded. So areas which my model shows as future ‘coastline’ would almost certainly be quickly eroded away.

Fifthly, I don’t take any account of coastal defences. It’s obviously possible to build defences that protect habitable land far below sea level. I’ve got no way of knowing whether current defences (in Holland, say) are able to withstand an extra +1 metre of mean sea level. I imagine that the impact would depend upon how quickly the oceans rise, and how much money was available for building new defences.

Finally, there are areas of the world far from the oceans that are far below sea level. These areas are shown as flooded on my map, where clearly they are not in danger. The area North of the Caspian Sea is the most striking example.

Do you plan more versions (I’ve seen a lot messages asking for a 50-100 m rise).

I could certainly replace some of the levels with more extreme scenarios like this. I’m not sure whether its such a good idea. I’m more interested in alerting people to the certain consequences of current global warming than on indulging people’s fascination with science-fiction scenarios.

I’m currently working on a system that would allow people to turn the maps into images on T-shirts. I hope that will help to get the message beyond its Internet ghetto, into pubs and workplaces.

If you know of anyone who has better data, then let me know. I’d love to work with them to get their work to a wider audience.

Comment · Comments Feed · TrackBack

  1. Leon Geschwind said,

    19 May, 2006 @ 03:54

    Hi Alex,

    I work as a science educator at Bishop Museum (the largest museum in the state and the premier natural and cultural history institution in the Pacific) and I absolutely loved your flood maps site. We are working on developing an exhibit on climate change and would be interested in producing a Google Earth type kiosk where the visitor could zoom into their locale and see how it would be affected by global climate change (temp increase, sea level rise, etc.). If you have a moment, I would love to chat with you. Let me know what the best way would be to contact you. Or feel free to email me as well.

    Aloha, Leon

  2. günther said,

    22 May, 2006 @ 01:23

    Hallo, this is a nice theorie, but the most ice is on the south pole. Grönland was in earlier time ice free! without any change on the sea level. you see, your theorie is bullshit.


  3. Joerg Maass said,

    22 May, 2006 @ 19:44

    In Response to Günther:

    Ignorance is Bliss (George Orwell). ‘Nuff said…

  4. alex said,

    22 May, 2006 @ 23:03

    günther: Your elegant proof has convinced me. Of course Greenland’s millions of cubic kilometres of ice would have no impact on global sea levels if they were to melt. Silly me.

  5. Henning said,

    24 May, 2006 @ 10:56

    Hi, this will be the blue planet ;-).

    I looked at a map of my home and let the water rise. We have a river (ok, a small river) that is connected to the baltic sea but I couldn’t see any changes there – isn’t it right that rivers are getting higher levels too?

    Greetz Henning

  6. Trinidadian in New York said,

    24 May, 2006 @ 17:09

    Alex, I don’t believe your efforts are in vain. Not everything seen or experienced are able to be explained, but some people have vision to see things that others can’t.

    That’s the way GOD made us.

    Please keep my email address in your alert lists (ESPECIALLY IN YOUR EMERGENCY ALERT LIST)

  7. Crooked Timber » » Swimming with the fishes said,

    25 May, 2006 @ 16:18

    […] Blogger Alex Tingle has made enterprising use of Google Maps by designing an overlay that shows the effects of the sea level rising . You can choose your level (up to 14m) and the map will show if a given bit of land would be underwater, and you can toggle between a map view (with placenames) and a satellite view, and you can zoom in and out. Of course, there are lots of caveats since he’s ignored tides and flood defences, the data may be less that 100% accurate, etc. Still, it’s an entertaining and instructive bit of coding. I’m happy to report that my own house will remain dry (though I’ll be dead long before we get to 14m, anyway). posted on Thursday, May 25th, 2006 at 11:18 am Post a comment […]

  8. Owen’s Photolog » Blog Archive » Future Beach-front Property said,

    26 May, 2006 @ 20:34

    […] Based on this google maps hack, I can look forward to a great ocean-front view from my current apartment if sealevels rise 14m. There are a lot of caveats, it’s an interesting exercise regardless. […]

  9. sombra digital » Flood Maps said,

    9 June, 2006 @ 09:13

    […] ¿Sube el nivel de los océanos? ¿Qué tierras quedarán inundadas?. Esto es lo que se preguntaba Alex Tingle, especialista en sistemas,mientras  buscaba datos sobre el impacto del crecimiento de los mares en las ciudades, tras leer el informe que en enero de este año el gobierno de Gran Bretaña dio a conocer señalando que la emisión de gases que causan el efecto invernadero era más peligrosa que lo pensado. […]

  10. Ara Pacis said,

    14 June, 2006 @ 18:58

    Great app. I wish it was built into Google Earth (there’s a KML for a limited flood at –I’ll have to figure out how to fix it to work in the US). You say that you want to avoid alarmist global warming, but maybe you could make a couple levels at higher levels as geologic/geographic curiosities for full melts of Greenland, West Antarctica, and East Antarctica. Just a suggestion. Thanks for the hard work.


  11. Ian Hargraves said,

    19 June, 2006 @ 10:42

    Hi, I am a member of a Local Agenda 21 group in Medway, Kent. We are a voluntary organisation trying to promote the reduction of wastage of all types, resources, energy, water etc. etc. We are pulling this altogether under Global Climate Change.

    I would like to make a presentation for our roadshow that shows the effects that rising sea levels would have on Medway. Your simulation is brilliant but I would like to discuss how we could use it to make a poster size image of Medway at several different sea levels to graphically show the impacts.

    Regards Ian

  12. Neville Kingdon said,

    21 June, 2006 @ 12:17

    When viewing certain of England (Somerset Levels, around the Isle of Thanet, the Fens etc) it helps provides a visualisation of past coastlines lost to historic siltation, articifial drainage etc that has occur since the Middle Ages (and before). Winchelsea and Rye (Sussex) and other lost ports regain access to the sea, the many “Isle’s” resume their island nature. The courses of many roman roman roads near to low lying land exemplify their reasoning to build where they did. This is a fasinating tool with a serious message of sea level effects in our future – the displaced millions will have to go somewhere.


  13. Valerie said,

    28 June, 2006 @ 23:48

    While 50 meters may be too extreme even by the most pessimistic standards, 20 meters is being talked about as possible. Can/would you add functionality to that level?

    VT, San Rafael CA

  14. L Vin said,

    2 July, 2006 @ 02:08

    Hi thank you for the wounderfull work you are doing. Curiousity, have you ever explored what the world map would look like if all of the polar ice water enteres into the earths oceans. I would love to see what a 1000 foot rise in water mean to the earths coast line, but especialy i would like to see thise effects on the califonria/oregon coastline. if you please=) Thank you L

  15. dan wynne said,

    7 July, 2006 @ 22:25

    Hooray for Alex for making this product.

    The 6 m rise is the most appropriate. There is ample research that sea level rose 6 m within a period of one century, sometime in the last 150,000 years; the field work was out of Barbados or some place and the record has apparently been accepted. To me this is key because it is based on fact of what the planet has done, not the highly charged emotion and half-completed “science” of global warming.

    Crank in 6m and cry…

  16. JJ said,

    8 July, 2006 @ 16:21

    As of july 2006 rises of up to 120 metres are seriously being discussed should the Greenland icecap melt. Worst case scenario is within 10 years.

  17. Tim Brew said,

    11 July, 2006 @ 08:30

    Hi Alex I am the Climate Change Project officer at the West Wales Ecocentre. We are producing interactive white board teaching resources for use in schools and I have been looking for some time for a map like the one you have produced. The aim of our project is to show the impacts of climate change in Wales and what we can do as individuals and a community to reduce these impacts. I would love to incorporate your work into the resources we are producing and am interested in having a discussion on the options for doing this. Tim

  18. Christian Rioux said,

    11 July, 2006 @ 17:14

    I was looking for something like this for years. Thanks for the superb job!

  19. ahmed said,

    13 July, 2006 @ 16:18

    Kudos Alex! Keep up the G-R-E-A-T work!

  20. RichardG said,

    18 July, 2006 @ 22:09

    Very nice! As a geologist, I have wanted to do this little exercise for a long time, but I don’t have enough computer background to do it. So, thanks very much. I like it a lot.

    Do you want to know where our climate could end up and how far inland you’d have to move to escape the rising tide?

    If we assume that the current trigger (humans releasing carbon that has been stored for millions of years) causes Earth to continue warming and return to an average temperature that is similar to what it has been during most of its history, then both polar ice caps and Greenland will melt completely (this can’t happen overnight, but conceivably could happen over several decades).

    That would cause a sea level rise of about 67 meters. It would also leave a layer of fresh water 10s of meters deep on the sea surface, which could cause a pelagic extinction event as great as the one at the end of the Paleozoic – when 90 to 95 percent of all marine life vanished.

    We won’t fare very well if that happens.

  21. Amy said,

    19 July, 2006 @ 04:18

    Hi Alex,

    my name is Amy and like Leon I work as an exhibition developer at a science centre. We’re currently looking for ideas for exhibits for Polar Year 2007 and I’d love to talk to you about your software. You can contact me via email.

    Have a great day!


  22. Clive Bates said,

    22 July, 2006 @ 18:06

    Alex – greetings. Love the flood mapping application – I’ve featured it on my blog today. here

  23. Susie Stockton-Link said,

    2 August, 2006 @ 22:00

    Dear Alex,

    Is there any way in which you can use the UK’s Ordnance Survey maps’ contours to make a more accurate map for that area? Judging by what I’ve seen, England would be hit very hard indeed… but, there again, I don’t live in the Netherlands… This makes me very glad that we are based in mid-Wales! Thanks so much for doing this – it’s something I wish could be made compulsory viewing for an awful lot of politicians. Susie

  24. Erich said,

    17 August, 2006 @ 13:34

    After all is said and done… Mother Nature has never lost a battle. Hmmmm… why do so many people think that the battle over global warming will be any different. Me, I’ve taken up long distance swimming and am looking forward to many new and amazing underwater sites.

  25. Noah said,

    2 September, 2006 @ 20:23

    Jeez Alex, You are a forgiving optimist. At the highest flood level you have me sitting high and dry. After 35 years of ocean mapping for the US Navy, I know that your map is absolutly wrong. You have no inland low level basins filling up. I will be under water at a 20 foot ocean level rise. You should see my boat!! Why is thier still ice on your land masses. Back to the drawing board. And double all your figures. Use proper math and stay away from that silly ass Google, it’s a search engine, not a Prophet of Doom.

  26. dubuc said,

    5 September, 2006 @ 07:29

    Alex, great work on a popular basis, never mind those spoiling your efforts. As stated by german scientists, ( by the melting of the iceshield in Greenland, sea level will rise about 7 meters, the Antarctic will add ca. 62 meters. So your calculations for the UK and Western Europe are basically o.k.! Nonetheless, the 70 meter calculation as a worst-case scenario would be highly interesting. I’ve been trying to calculate it for my region (Northrhine-Westphalia, the northwestern part of Germany). At the moment, I am lacking the computing power and the knowledge but I’ll keep trying. so long, and thanks in the name of the fish

  27. Boston Lass said,

    9 September, 2006 @ 15:01

    Another request for a similar map with higher water-marks — though not in response to global warming. Scientists are talking about a tsunami that will slam the Eastern seaboard (of the US) with a significant wall of water. A map showing a rise of, say, 75 feet (25 meters, if my basic math is correct) might help those of us thinking about evacuation routes.

    Also, kudos and thank you for your work.

  28. Jason Warren said,

    24 September, 2006 @ 21:19

    Alex, superb work… an excellent site in a crazy world. Jason

  29. Leo Kerr said,

    26 September, 2006 @ 07:54

    Hi Alex – great work you’ve done on the flood maps – would you mind if we take some snapshots and use them on our website and also put a link to your site. We are a voluntary, not for profit, community environmental group and we have offered carbon offsets to the local Australian community since 2001 (but we’ve been planting trees since 1978 here in Western Australia). Would appreciate your permission to do so.

    regards Leo Chair – Carbon Neutral Program Men of The Trees WA

  30. Andrew said,

    1 October, 2006 @ 08:47


    I think, like one of the other respondents, that you are an optimist. Why did you stop at 14 metres? I would like to see the effect of a 50 metre and 100 metre rise AND fall in sea levels.

    In recent geologic time,

  31. Strangeprogress said,

    1 October, 2006 @ 12:06

    I found your flood maps really interesting, especially as I’m currently developing a googlemaps API based website (not to mention the fact that it’s intriguing to realise that we’re currently alive at a turning point for our species survival!)

    Living in a coastal city on a small island nation (New Zealand), I have a front row seat…. oh goody :/

  32. Belly said,

    6 October, 2006 @ 02:05


    I live in Perth Australia and have been facinated by the recent information on nine msn and other sources talking about the impending water rises. They have said it will be 25m though in 15 years. Can you update your site to show the effects of this? I would love to see if the new house I just built will be under water. hardly seems worth paying for it if this is really gonna happen ; )

  33. Alex said,

    8 October, 2006 @ 21:32


    Thanks for the info. Could you please adjust for the worse case 300 foot rise.



  34. Dave Sag said,

    10 October, 2006 @ 22:43

    You’ve done a fantastic job. I came across this while searching for sea-level rise simulations in GoogleEarth, but this is the next best thing, and the best site I have found online like this so far.

    Other links I have found doing similar things: – very static – with animations. – Java applet – Java but focussed on the USA only really.

    If anyone knows of a GoogleEarth project that uses this data I’d love to know, especially GE4 as it supports changes over time.

    Cheers Dave – (CEO of Carbon Planet –

  35. Andrew said,

    12 October, 2006 @ 06:57

    I had difficulty with the application of flood at reasonable resolution – not sure why – specified lack of resolution data for that area (metropolitan australia). any thoughts? great excercise: I tried to get State govt support to do something similar a year ago as an education tool, but was advised that support wouldn’t happen due to political ramifications of any impacts on the property market!

  36. Richard said,

    14 October, 2006 @ 07:39

    Thanks so much for your great work on the flodmaps site. It reallybrings home in the most graphic way the relaity of global warming and the threat of rising ocean levels.

    I’d like to suggest a coding change that would make the site a lot easier to use while reducing the amount of data transfer.

    A big difficulty in zooming in to an area at present is locking in on your target. It would really help if you could click a “target” icon onto a specific area and then zoom precisely to that area, with each increase or decrease in resolution remaing centered on the target.

    It’d be much faster to locate precisely the area you want to see and greatly reduce the data transfer with less jumping about.

    Thanks again for your great work.

  37. alex said,

    14 October, 2006 @ 10:58

    Richard: Double-click on the map to centre it on a point. Then you can zoom in/out as much as you like, and that point will remain in the centre.

  38. Michael Williams said,

    14 October, 2006 @ 12:57

    Well done on your research. For the past twelve years I have been aware of the ramifications of this scenario, based on projections of the concequences of coal comsumption in 1899, as mused about by John Munro, in ” Is the End of the World Near?- A Question and an Answer.” (Cassell’s, January 1899),who suggested, based on warnings by Lord Kelvin even then that our pollution would lead to Global Warming, though he never guessed our consumption and population would have multiplied to their present extent, exponentially multipling the rate of this effect. {I still have a copy of the reprint of this work, interesting for the modern conclusions and speculations it raises, including alternatives in hydroelectricity, and would be happy to scan it for those interested.} This is why i now live in the Great Dividing Range in Victoria, Australia at an elevation of between 200-300 metres above sealevel. My original projections suggested a rise of 125- 300 metres, we will see who’s bet is closest eventually i guess. I attempted to make people I knew aware of the polar melting back then but recieved only scepticism and scorn, so I left the low lands, figuring it better to reach high ground long before mobs of refugees could block escape paths. I am a private individual, with a scientific approach to my environment, and continue to research without funding or recognition. In many ways I prefer the freedom this situation allows me. I would remind your critics, and mine for that matter, that the epoch when the polar seas were last free of ice was prior to the last ice age, and the coastal areas from that time are now far inland and at great elevations between 100-1300 feet above present sea level, these pre glacial beaches were not all stranded by elevation of land mass but mostly by recedence of the ocean levels due to the ice age. Conversely, around the tenth century B.C. the sea level was between 450-500 feet lower than its present level and rose by 500 feet due to the melting and receding of the third glacial spread, with accompaning rain torrents and volcanic activity, roughly 11000 – 12000 years ago, leading to the global myths of the great flood. Over the last several thousand years it has risen by about a foot each century. These are scientific facts backed up by geological and oceanographic studies and tests. One begins to feel like Noah/Teocipactli, being doubted by those who later demand help and shelter. In any event I am seeking to preserve as much usefull knowledge as possible in the hope that should there be a worse case scenario such as we are disscusing, or even a nuclear winter scenario, some of our knowledge and achievments might survive to be of use in the future. I prefer written records to computer ones for this on account of possible magnetic disturbance destruction. It only takes ten years to forget a hundred years of learning, and how many school leavers today know even a fraction of their own cultures history even now? Ultimately I don’t feel one can be too alarmist, only too complacent. There is a real need for this matter to be taken much more seriously by our world leaders – let them panic; they may actually be moved towards action then. Anyhow thanks again for this pioneering work, good to see i am not alone in reaching these conclusions.

  39. Duncan Hare said,

    19 October, 2006 @ 19:21

    II live in Orange County, CA. At 2-4 m rise, the OC Sanitation District Plant (The sewage works) is flooded, leaving Most of Orange County Uninhabitable. I suspect the same will happen to LA, San Diego, San Francisco, San Mateo, Western Contra Costa and Santa Clara Counties. That’s only 60-80% of the CA population. 20 to 24 million people displaced.

    And you have an assumption which I’d like to challenge. I doubt the sea level rise will be gradual and linear. If a large piece of the Antarctic ice shelf slides into the sea, I suspect we’ll have a tsunami or two – they will make Katrina’s urban clearance look like a limited event.

  40. Ed said,

    26 October, 2006 @ 12:35

    Hi ~

    How odd that people think you’re doing more than playing with data to demonstrate a point.

    Anyway – is this available as a WMS?

    Drop me a line – we might be able to help out with hosting some more granular data.

  41. Veronica said,

    30 October, 2006 @ 15:46

    Hi Alex et al

    I think these maps are fascinating and would be very grateful to be pointed in the direction of any other similar work around. Like many others I would be interested to see effects of rises higher than 14m – also help working out what might happen in some areas further from the coast but where rivers would behave differently because of the rise in sea level. I am interested, obviously, in what may happen to us all in reality, but my current particular interests are because I’m writing a children’s novel set in a future more watery England after a big rise in sea level. My picture of what the country might look like has always I think been very influenced by the picture painted many years ago by John Wyndham in The Kraken Wakes – a great depiction also of public and government denial in the face of disaster – but I think he imagined a rise of around 100-125 ft if the polar ice caps melted – no idea if he just made this up or if it was based on ideas around at the time he was writing. thanks for an interesting site and also thanks for any suggestions from people for where I might find more info or people to talk to. Have had some useful help already from a geologist found via a brilliant website which I recommend to any other writers/artists – – puts scientists in touch with writers and artists etc.

  42. Steve said,

    30 October, 2006 @ 22:17

    Nice piece of work Alex.

    You are doing a great job of getting folks thinking about the ‘what if’ scenarios regardless of their views on the probability of a rise happening.

    It would be great to get into some more detailed resolution of densely populated politically important areas such as London, New York, Tokyo etc. I think this will really get the message across where it really matters most – the global impact of a rise in sea level can only be tackled by people having a good understanding of the local impact on them and their futures.

    I do think there is more accurate source data out there and you might consider trying to get some sponsorship to do father work from Friends of the earth or similar environmental campaigners.

    Good luck and keep up the good work.

  43. David Moorhouse said,

    1 November, 2006 @ 10:30

    Excellent work.

    Do you mind if I cut and paste some for an educational poster for a local non profit I do volunteer work for ?

    I think this is the quickest way of getting the seriousness of the situation across to people.

  44. alex said,

    1 November, 2006 @ 10:55

    David Moorhouse: My images are the translucent blue overlay tiles. They are derived from NASA data. You may use them, but you should credit both NASA and myself.

    The map or satellite images are provided by Google. You should consult their terms of service before using them.

  45. Samantha Turnbull said,

    2 November, 2006 @ 02:07

    I work for a regional Australian newspaper and we were wondering if it’s possible to download images from your site? Please let me know on the above email address

  46. Mary K. said,

    5 November, 2006 @ 23:32

    Hi Alex,

    Fantastic site. I’m working for a production company and I’ve love to ask you some questions about your map. Would you please respond to the address above?

    Thank you!


  47. Sean said,

    13 November, 2006 @ 13:29

    Hello Alex,

    This is a great article. I am new to your blog and i like what I see. I look forward to your future work.

    Thanks a lot!


  48. Seminara said,

    16 November, 2006 @ 09:35

    Having just seen Al Gore’s ‘An Inconvenient Truth’, a rise of 20 feet following the loss of Greenland’s ice shelf isn’t science fiction.

    As someone who lives on the coast in England, I would be both interested and grateful if you could – please – offer us a vision of what the coast lines would look like following this disaster scenario.

    Many thanks!

  49. alex said,

    16 November, 2006 @ 09:44

    Seminara: Hey! I know of this great website that already does exactly what you’re looking for…!

  50. Seminara said,

    16 November, 2006 @ 20:06

    Thanks Alex, I’m of course already looking at that site. :) However it’s forecast ends at 14 meters. Ahhh – I see my mistake – I said 20 feet whilst I’d meant 20 meters (I’m pretty sure it was meters they’d mentioned in the movie).

    So yes, sorry, please include stats which reach a disaster scenario of 20 meters increase as soon as you possibly can.

    Thanks again

  51. Seminara said,

    17 November, 2006 @ 19:46

    Sorry – wish I could delete the previous 2 entries (I was right the first time – it was feet) so your map covers the calculations.

    Apologies for being a scatter brain (one of those manic weeks)!

  52. OceKo » Attention aux l’inondations said,

    17 November, 2006 @ 22:06

    […] Voici une carte Google Map nous permettant de régler le niveau de montée des eaux de la Mer. Cette carte est basée sur les éléments de recherche de la NASA et mise en application par Alex Tingle. […]

  53. hablandodesigs » Blog Archive » Mapa del Incremento en el Nivel del Mar said,

    1 December, 2006 @ 06:19

    […] Hace pocos días leí nuevamente la nota sobre Tulavu, un país isleño del Pacífico que debido al incremento del nivel del mar calcula que su país desaparecerá en no más de 50 años y solicita a Australia y Nueva Zelanda apoyo para trasladar a su población a otras regiones. Y justamente hoy leo sobre el mismo tema en b l o g r a p h o s donde josé barreda nos platica sobre un Mashup con Google Maps para visualizar lo que sucedería si el nivel del mar se elevara 1, 2, 3 o hasta 14 metros. Dicha aplicación se llama FloodMap y la ha desarrollado Alex Tingle  a partir de la información de la NASA. […]

  54. the tweney review » Blog Archive » Flood maps. said,

    6 December, 2006 @ 22:29

    […] There’s a disclaimer by the mashup’s developer which states that this map isn’t necessarily very accurate, and takes no account of tidal changes (obviously an important detail). […]

  55. Mark Lynch said,

    9 December, 2006 @ 17:41

    Alex First off, brilliant site. There is a very good reason to put higher depths of water if it’s possible without becoming alarmist. For those interested in pre history, before this present ice age, the sea levels were higher than 14 Metres. I believe I have stumbled across something significant, using amongst other things, your site. Not sure what I’m going to do with what I have noticed yet. Cheers Mark

  56. Simon said,

    14 December, 2006 @ 19:30

    Alex, thank you. Another big thumbs up and another vote for higher sea levels. Seeing as people like Lovelock are talking about 80m scenarios(I think). As for the risk of being alarmist. I really dont think that a small amount of alarm would be terrible given the circumstances.

  57. MOSES said,

    15 December, 2006 @ 00:16


    I would like to thank you for this great web site..I’m looking at the future (around 2050) with an estimated sea rise of 14m And your map is very accurate. In old carthagenian times utica was a port..and this is true with 14m. The biggest catastrophical event is in cairo, holland, belgium (north), UK (cambridge under water). I think that we need to consider this in road construction, evacuation plan….and also use this for archiological research.

    Is it possible to have a scale upto 30m. Thank you.


  58. Jim Linnnane said,

    16 December, 2006 @ 09:59

    This is an interesting piece of work. I hope it is widely distributed because of its impact. I have a few questions though.

    Do people realize that they can do the same analysis, including all of the caveats that you rightfully noted, in greater detail for their local area by consulting topographical maps? For the US you can look at free topo maps by going to These maps are usually drawn at a scale of 1:24,000, and have contour intervals of 100’/30m in hilly areas and 10’/3m in flat areas. In the UK and Ireland, ordnance survey maps contain similar information at similar scales. Of course the beauty of your analysis is its world-wide scale.

    Has anyone credibly calculated the rise in sea level to be expected in this century? Al Gore’s 20’/6m sounds about right. In a warmer climate, water will expand. Ice above sea level, mountain glaciers, the Greenland ice cap, and some of the Antarctic ice cap will melt and contribute their volume. Please remember, though, that just about all Arctic ice, with the important exception of Greenland, and some part of Antarctic ice is already at or below sea level. Melting of this ice, although disastrous because of its feedback on climate, would not, in and of itself, cause sea levels to rise significantly.

    The thing to consider in studying local topo maps is the impact of climate warming and consequent sea level rise on storms and wave action. Even if you are 1000’/300m above sea level, your local streams might be more prone to flooding as snow melts and forests are destroyed.

  59. Jim Linnnane said,

    16 December, 2006 @ 11:47

    One more thing, if you are interested in the effects of a higher shoreline, check out Cadillac Cliffs in Acadia National Park. These cliffs are about 10m high and occur at an elevation of about 60m. To most observers, it is obvious that these cliffs were carved by ocean waves. Within a couple of miles and down 60 meters one can see the process at work in the present. The National Park Service ( says that these cliffs were carved when the land was depressed by the weight of 3 km thickness of ice during the last ice age, and had not fully rebounded to its present height immediately after the ice departed.

  60. sd express » Blog Archives » Flood Maps said,

    16 December, 2006 @ 15:24

    […] ” Le niveau des océans connaîtra une hausse beaucoup plus rapide qu’évalué usqu’à maintenant, à cause du réchauffement climatique et de la dilatation de l’eau. ” — Radio-Canada. […]

  61. meck said,

    17 December, 2006 @ 04:51

    ok. we have all heard the reports of sea levels rising above the 14m that your map shows…time to take it up to 50-100m level that people are requesting.

  62. Explore Our Planet » About Rising Sea Level - it’s simply Global Warming and Climate Change said,

    31 December, 2006 @ 19:23

    […] Read more: Earth Observatory, ARGO, PNAS, NASA JPL, GLOSS, SEDAC More about Flood Maps or google. […]

  63. Mike Trousdell said,

    9 January, 2007 @ 15:48


    Fantastic site!!

    I also think it would be good to include more sea level rise.

    I read in Wikipedia that if all the ice in Greenland Antarctica melted the seas would raise by 68.8m, maybe it would be good to put 30m instead of 14m on your website.

    For further information read:

  64. Eric Avebury said,

    11 January, 2007 @ 23:13

    This is a brilliant piece of work Alex! I will mention it if I may in next Monday’s debate in the House of Lords on the benefits to be expected from the International Polar Year 2007-08 following the British hosting of the Antarctic Treaty consultative meeting in Edinburgh in June.

  65. alex said,

    11 January, 2007 @ 23:34

    Lord Avebury: Thank you for your kind words. Of course I would be happy to have you mention Flood Maps in your debate on Monday.

  66. Lauren said,

    13 January, 2007 @ 04:24

    Hi Alex, This is a great site! I’ve started up a climate change website and would really love to include some of this sort of data on it… Is there any chance I could expand some of your code or use it on the site? Please let me know what your terms are :-) Thanks,!

  67. Harvey said,

    14 January, 2007 @ 17:29

    I just read in Time that a complete Antartic ice cap melt would raise see levels by 215 feet (if you add Greenland, in total about 80 metres). Do you have a map for that? I’m going to start work on an Ark. Good luck.

  68. Harvey said,

    14 January, 2007 @ 18:03

    Ok, now that I’ve read the blogs I can see lot’s of people are asking about the rises of around 70 metres. Note to self: Read first, write second. By the way I started a stie to try to get younger people interested in discussing, thinking about ways to innovate in business with green ideas at if anyone’s interested.

  69. JBurt said,

    16 January, 2007 @ 10:56

    My understanding from all realistic projections is that if ALL ice on earth melted, sea levels would rise only 0.6 – 0.8 m. Having an allowance of 14 m, therefore, seems excessive given that we’re not going to be creating more water on earth. Could this be realistically re-tweaked to have cm increments from 1 – 2m?


  70. alex said,

    16 January, 2007 @ 11:20

    JBurt: Sorry but you are misinformed.

    Greenland’s ice sheet alone contains 2,620,000 cubic kilimetres of ice. That’s enough to raise the sea levels by 6.5 metres. Source:

    The UK government’s panel of scientists have determined that this ice is irrevocably melting, and it will be all gone within 1000 years. The problem is that once it starts to melt, there’s a positive feedback effect. Greenland’s ice sheet is 4km thick on average. The air is much colder 4km up than at sea level. As the ice melts, the thickness reduces and the effective air temperature to which it is exposed rises and rises…

  71. Alessandro said,

    20 January, 2007 @ 20:26

    Congratulations on your flood map, it is amazing! Nice job.

  72. Julie said,

    22 January, 2007 @ 21:15

    Hi Alex

    As a middle aged Mum I find this terrifying. What time scale are you forcasting for this? We live at the edge of the sea and a one metre increase in sea levels would destroy our home.

  73. Aidan Luce said,

    22 January, 2007 @ 23:50

    Hi Alex, I can’t get this to work at all. i just get the google map. i want to see the world washed free of sinners (myself included)

  74. Aidan Luce said,

    23 January, 2007 @ 19:28

    hi Alex, still can’t get it working. I know nothing about computing, i just want to use your fabulous resource. i use internet explorer as my browser, is it worth downloading firefox or another alternative?

  75. Mark Tinley said,

    28 January, 2007 @ 13:34

    At 10m flooding the map shows the extent of the flooding in the area around our house as being less flooded than it was last week during the heavy rains.

    What is really strange about this is that we live next to the river and had the water level here risen 10m then our house would be under water.

    Even more odd is that we live at the bottom of a hill yet your map showed an area at the top of the hill as being OK.

    I imagine this map is actually pretty inaccurate at high zoom levels but as an overall indication I am astonished to be honest. Keep up the good work!

    I read some of the FAQ and this may help those curious to know what would happen if all the World’s ice melted.

    This study has been carried out by the University of London.

    I think a lot of other environmental stuff would be very wrong if all the World’s ice melted and flooding would be the least of our worries.

    Would be interested to see a bit more depth though.

    I am 43 and the speed with which things are changing is causing me to think carefully about where to buy my next home.

    I don’t want to be rowing to the doctors surgery etc when I am in my eighties.



  76. Kate said,

    30 January, 2007 @ 04:14

    Great Map Work; Good Job!

    What many don’t seem to realize though, is that once enough of the earth’s ice has melted away, and the sea level has risen a few feet; perhaps 20 to 50, we will most likely be in the throws of a major ice age that may outdo the ice ages of the past. With that much fresh water entering the salt oceans, our world’s tropical currents will literally stop for a while, and it will suddenly become VERY cold; or VERY hot, depending on where you live. Basically, our thermostat will break, and it will not be able to regulate the temperatures on earth. We will not suddenly have lovely waterfront property if we were living inland: 50 or 60, or so feet above sea level. We will, perhaps, be reduced to a world of no electricity, or modern conveniences.

    Life will be so very different, that we cannot even imagine what our lives will be like. One thing that is for sure though, is that our world population will be GREATLY reduced if this takes place.

    I am just hoping that our leaders can make a decision very FAST, to change our way of living to reduce the world’s emissions. We can do a lot ourselves, but I am afraid that it is going to take the whole world on a gigantic level, to abruptly change the way we live, and this will have to be done at the world leader’s levels.

    The tee-shirt idea is great. The more people that know of this alarming information that is already occurring; not in the future, but NOW, then maybe we will have a chance.

    It’s good to find so many people that ARE trying to make the leaders listen. I’m glad I tripped over this site. Thanks for being here.

  77. Kate said,

    30 January, 2007 @ 04:32

    One more thing I might add, is that I am going to have this map, of the area I live in, air brushed on my van, with Al Gores Web site address: on it. That can also help to make more see what is happening.

    Also, for further viewing, for anyone here, go to: “This talk is a follow-up to his now-famous presentation, featured in the movie, “An Inconvenient Truth.” In it, he outlines what we can do to avert a global climate crisis.” It’s less than 20 minutes long. Enjoy.

  78. Tanja said,

    30 January, 2007 @ 10:16

    Hi Alex, I’m fond of your maps and would like to include it into a background paper on Health security for my job. Of course referencing you- but how can I put the map into a usable format? Even printing to pdf doesn’t work…. Tanja

  79. Grace said,

    31 January, 2007 @ 00:03

    I am looking for a way to demonstrate the effect of storm surges and tides. Please do add the capability of looking at ocean levels of up to 30-50 meters above MSL.

  80. C. Stuart Whipple said,

    3 February, 2007 @ 16:32

    Alex, is your global warming sea-rising map available on disk?

    I am setting up a global warming display at Gulf Coast National Park ranger station and thought your interactive map might be a fine “grabber” for our visitors. We cannot set up a web connected computer for the public but want to take advantage of an inquiry from “upstairs” wondering what we are doing to provide interpretive information at our park. Thanks for your work in creating a useful tool for education.

    Stu Whipple

  81. Andy Cars said,

    3 February, 2007 @ 23:22

    Hi, I have looked at your map and cannot understand how Stockholm, Sweden (where I live) cannot be completely under water if the sea level would rise by 14 meter. Infact the map shows that “Strandvägen” (main road just by the water), would still not be under water at 14 meter plus. Given what I can see with my own eyes when walking downtown by the water, it would be enough with a sea level rise of no more than 2 meters to put most of central Stockholm completely under water. Or have I misunderstood your map? In any case, a great initative for which I thank you. Regards, Andy Cars, Stockholm

  82. alex said,

    4 February, 2007 @ 01:42

    Andy Cars: Stockholm is right on the boundary of the available data. I’m afraid that the accuracy gets really bad up that far North. Sorry.

  83. Michael Hoffmann said,

    4 February, 2007 @ 21:15

    I am missing flood levels between 19 and 58 centi(!)meters (0.19 to 0.58 meters), which are the values prognosed in the current IPCC report.


  84. alex said,

    5 February, 2007 @ 21:45

    Michael Hoffman: Sorry, but NASA’s data is only available in whole metres. If you know of a more fine-grained dataset, then please let me know.

  85. Peter Lee said,

    9 February, 2007 @ 12:48

    Your maps show bays and inlets but don’t go up river much. I am looking to see ancient river leels (the Avon at Stone Henge and the Nile at Giza) from when the sea level was 6 – 7 metres higher. Your map shows Glastonbury as a foreshore and the old Roman/briton sea levels line up with the old harbours but i really want to see the effects inland. Are you able to help?

  86. James Haughton said,

    19 February, 2007 @ 06:09

    Any chance of showing what the level would be like if sea level declined (as it was in the last ice age)?

  87. Robert Mann said,

    21 February, 2007 @ 05:37

    How does one save these images? I want to use some of the images to put in a leaflet about ‘what would happen’ if the sea levels in my area rise

    Many thanks for your work

  88. Enterik said,

    26 February, 2007 @ 18:37

    Why doesn’t Narragansett Bay of Rhode Island, United States (northeast just south of Boston) register any flooding?

  89. David William Fairbairn said,

    2 March, 2007 @ 04:08


    I am a student at the Nova Scotia College of Art and Design, and i am producing a body of work that is meant to raise global warming awareness. I was thrilled to come across your site, as it is a great resource for a peice of public art i intend to install. The peice consists of a line of large helium balloons stretching uphill from the current shoreline of downtown halifax, at the predicted height of the ocean, until it reaches the predicted shoreline as indicated on your map. I hope that with the aid of a brief explaination at the base of each balloon, this project will function as a haunting indication of what is to come if nothing is to change. I have one question in regards to the map, which will be a deciding factor in my peice; at the maximum height of 14 metres, is that an indication of the rise in sea level from the current sea level? because i have found in my research that a rise of a mere centimetre above sea the current sea level would cause shoreline recession of 10 metres, so in the case of your map, a rise in sea level of 14 metres would cause significantly larger distances of shoreline recession. I suppose what i am asking is, at sea level, what height should should my first balloon be?

    Thank you, i appreciate and admire your intentions in creating this map. I will make it avaliable to as many people as possible.

  90. Andy House said,

    6 March, 2007 @ 22:02

    Thanks Alex – This is fascinating.

    I have found something similar to your excellent work for the UK only – but nowhere near the usability..

    Is there any way that the computing power you need could be spread amongst us all as with the recent UK Meterological Office climate projections?

    My unused cycles await…

    So with a 14m rise Glastonbury’s mythical ‘Isle of Avalon’ ( returns – does this suggest that such a flood event has occurred somewhere before in our very ancient past?

    That makes me optimistic for the future – if we can survive it once..

  91. claudia reed said,

    7 March, 2007 @ 01:05

    I write for the Sonoma Index-Tribune (California, United States) and wanted to use your map for a story on the local impact of global warming. I was able to focus in on the City of Sonoma and surroundings (east to Napa and West to Petaluma) but unable to find sufficiently high resolution for use in the paper. Are there alternative maps you could send us?

    I would also like more information on who you are. As far as I can tell you are an interested citizen with a lot of technical savvy who has done an amazing amount of work. Are you also identifiable as a degreed scientist or someone associated with a known organization?

  92. Landon Silla said,

    29 March, 2007 @ 18:35

    First off, great work! this is truly fabulous. I have been working on a similar project for my company dedicated to promoting awareness for heritage sites around the world. I need to find a way to use this NASA info to generate some images. But i can’t seem to figure out how to read the files. PHP is my drug of choice, but I can do any language. So far i’m trying:

    $filename=’N48W126.hgt'; $handle = fopen( $filename, ‘rb’); $contents = fread($handle, 1024); echo $contents; fclose($handle);

    That doesn’t really show me anything cool. If you could, by chance, let me know how you read the darn file, i would greatly appreciate it. We are a non profit company so you would be helping preserve heritage sites around the world.

    Thank you for your time.

  93. alex said,

    30 March, 2007 @ 00:32

    Landon Silla: Code

  94. Jason said,

    31 March, 2007 @ 23:26

    Nice work, What are your thoughts about historical sea levels and how they due to ice ages. Would love to see what the world looked like 15K years ago. Thanks J

  95. Susan Ring said,

    3 April, 2007 @ 14:38

    Dear Alex, I have been looking for a map like this (for the admittedly petty reason of wanting to buy a property in London that I can leave to my children without fear of it being flooded in the future – Unfortunately, it looks like a lot of property near the Thames is out of the question). It seems to me that people are prepared to spend enormous amounts of money on property without thinking this through in global warming terms; they could be left with property liable to flood and worthless. That really would make people think more seriously about trying to combat global warming. Thank you for taking the trouble to start this process. Best wishes.

  96. John Hare said,

    8 April, 2007 @ 18:47

    Thanks for your mashup. It is a great service to the world.

    I’d like to offer a comment about the coverage of Mahattan. It looks like the NASA data you are using is skewed by the presence of a lot of dense buildings. Since the island is basically at sea level and essentially flat, even a modest rise in sea level would mean that there would be water everywhere, several stories up. You might consider (if possible) altering your data set to take that into account, as you did with the Netherlands.

    Again, great work!

  97. Michael Schmeling said,

    9 April, 2007 @ 15:54

    My earth screensaver at lets you change the sea level between -250m and +250m interactively and see the resulting changes in real time. A free 30-day trial is available. Perhaps it is interesting for some of the visitors of your site.

  98. shawn said,

    9 April, 2007 @ 18:14

    What about the great lakes, do you have any data on how they would be affected?

  99. Jack said,

    10 April, 2007 @ 16:23

    This is great, a bit inaccurate but very interesting. You say that you are “more interested in alerting people to the certain consequences of current global warming than on indulging people’s fascination with science-fiction scenarios.” even though a nearly 70 metre rise is possible. I think that map would be really intersting. I want to see at what point Bangladesh is completely submergerd, because it’s on it’s way at 14 metres.

  100. Tom Davis said,

    18 April, 2007 @ 20:08

    Outstanding work, and I love your response to Gunther. I hope that continued patient efforts to communicate the likely consequenses of global warming will eventually get through to people who bury their heads in the sand.

    What would be nice (just dreaming) would be if we could combine your maps with real estate values or endangered species habitat or population!

    To Kate, who airbrushed climate change info onto her van: how many tons of CO2 does your low mileage van pump into the air each year? It is nice to be concerned about global warming, but it is even better to actually do something about it. (My appologies if all you do is park it where people can see it).

  101. Steve from Australia said,

    21 April, 2007 @ 03:02

    Alex, I doffs me lid to yer. An exceptional project which can educate visually. Based on some of the requests you recieve (“What’s going to happen in my bit of the world”, and “Why haven’t YOU shown it correctly”), people are basically too lazy to read and understand about the data sets that are available to you. Maybe they need a pictorial FAQ also! ;-)

  102. Philip Sutton said,

    5 May, 2007 @ 01:06


    I would be great to have the map system also calculate a spread of years when the indicated level of inundation might occur. Maybe using Jim Hansen’s estimates, plus ….??? For example plug in 5m and it says could occur in 100 years plus or minus x or y.

    I know that adding this data might lead some people to become complacent. (I checked out one local govenment area I’m working on and figured out it’s ‘safe’ for about 60-70 years and then by century’s end it’s almost totally underwater! But the people in this area could take the view that they would be best to work flat out on prevention of global warming before they put a big effort into adaptation (ie. sea defences).

    Cheers, Philip

  103. Chris P said,

    14 May, 2007 @ 23:55

    Very nice, too bad you gave into what most designers these days have learned not to worry about… that is what programs versions have fallen behind.

    more sites like these force people to upgrade. hence provide a better, more accurate, depiction of what is trying to be said. its like designing a website for 800×600 monitors… users know they are on an archaic machine…

    Anyhow, morons saying this is all wrong clearly did read you points.

    HOWEVER, you might like to add one more point.

    Should Gleenland continue to melt as it currently is, the sea level will not riase souly becasue of it, but because other large ice mass such as antarctica and the many glaciers arround the world would be melting too. NOT JUST THAT, but the more the sea rises, the more land falls in to the sea as well.

    Keep up the good work, and i hope you get something out of this.


  104. Letitia said,

    23 May, 2007 @ 18:49

    I’d buy t-shirts like that – great idea!! I think you’d find a market for them if they were considered ‘cool’ enough for young people!

  105. mcarleton said,

    23 May, 2007 @ 20:00

    There appears to be a hole in the data for North America around Narragansett Bay on the Massachusetts-Rhode Island border. I need to be able to tell my relatives there when they need to sell out.

  106. Johan said,

    24 May, 2007 @ 13:26


    I’m living in that country that will submerge with one meter see level rising, The Netherlands. I’m very surprised by the fact that the biggest part of Holland will disappear with only one meter sea level rising! The fact is that a big part of Holland is already at least 3-7 meters below sea level and one meter will not change that while the map shows some thing else. Very strange and questionable date if you ask me while I’m absolutely not blind for the danger and challenges that we have here on this climate change.

  107. patrick richard said,

    25 May, 2007 @ 01:29

    About 10 years ago I was wandering into the Dowser Society’s office and store in St. Johnsbury VT and was intrigued by a very large special USGS map co-authored with …name unknown! and I wish I did know. Because Al Gore showed some of the map and I wish I had one…the south part of Florida was gone..California was islands (the Sierra Nevada range was flooded around the base and they became islands)…and Phoenix was the new westcoast harbor —oh POO!…but WHO authored that map in conjunction with the USGS- I’ve been trying to find out.l I’ve contacted the Dowsers of Britain and Canada but have no answers yet —that was Sept. and I’ve gone online with USGS to no avail lest one thinks Katrinas damage is a one-timer. Everyone should have this map. The folks inside the store in St. Johnsbury said little and I think they knew the author. I recall with confidence leaving thiniking — in 1992 — it would be easy to find out in the library or on the computer somehow. NOT. Got a clue? Anyone might want this map for higher ground folks. Not only for global warming, but if the Poles tip over and disorient all of us, we’ll need to see what’s there and what’s GONE bye-bye. Thank you. Patrick — New Mexico USA–

  108. Ian said,

    28 May, 2007 @ 07:03

    This is a great site! Saved my life on an assignment. Another website similar to this: It seems for some reason to show roughly the same sea levels as this engine on 14m. Any ideas why? The site linked above is good because it also lets you display different things such as population etc. but it only goes to 7m. A very interesting site!

  109. Ian Orchard said,

    10 June, 2007 @ 07:33

    I believe a map option showing the contour for 100m would be a good idea, given that the Kyoto Agreement hopes to stabilise atmospheric CO2 at 550ppm, but the last time they were at that level, during the Paleocene-Eocene thermal maximum (PETM)55 million ya, the oceans were 100m above their present levels.

  110. Alexander Shirfield said,

    11 June, 2007 @ 19:39

    My URL in this comment links to a video from the discovery channel. Although it seems to me that it may be scare mongering, it would be interesting to see what would happen if the Greenland sheet melted and sea level rose 25m. Great site, by the way, I’ve linked all my friends to it.

  111. Marieke Sander said,

    18 June, 2007 @ 08:07

    Dear Alex,

    Would it be possible to use some screenshots for a travelling exhibition on climate change in German high schools?

  112. Matt Zerega said,

    19 June, 2007 @ 20:44

    I appreciate your effort to help people understand that just because a particular scenario i) has never been seen or experienced before and, ii) is associated with consequences of a magnitude that has never been experienced, that one cannot reasonably conclude that the scenario is not feasible.

    As for your T-shirt idea, give a call to customink — they’ve got a friendly Web UI and my be willing to work with you to directly integrate your two sites.

  113. Yvonne Federowicz said,

    19 June, 2007 @ 21:59

    This is a repeat, but Narragansett Bay, Rhode Island, U.S.A. does not change coastline with sea level changes. Also the water color is a lighter shade of blue as if data is missing there for some reason.

    As a small state with lots of coastline, we’re very interested (although islanders have a much more severe problem.)

    Great website, Thanks! Yvonne

  114. Yvonne Federowicz said,

    19 June, 2007 @ 22:01

    This is a repeat, but Narragansett Bay, Rhode Island, U.S.A. does not change coastline with sea level changes. Also the water color is a lighter shade of blue as if data is missing there for some reason.

    Please see:,-71.2711&z=8

    As a small state with lots of coastline, we’re very interested (although islanders have a much more severe problem.)

    Great website, Thanks! Yvonne

  115. Global Warming and sea level » Nuno’s blog said,

    21 June, 2007 @ 01:21

    […] Check here to read how this was implemented. Tags:english, global warming sea level   « Últimas sobre a lei anti-tabaco em Portugal |   […]

  116. Danny G said,

    6 July, 2007 @ 16:04

    A few weeks ago, I was curious about rising sea-levels. I’d heard about the rise of 20 feet should the Ross Ice Shelf break off (and then, more importantly, melt). Curious about if all the ice everywhere melted, I managed to track down a site that gave the figures of 66 meteres or 216 feet. I’d heard a figure around 200 feet before, so this seemed to be the correct consensus. (Hey, I’m not a professional researcher).

    SO…I went to the USGS website, and downloaded topographic maps of any state with a coastline. I could not work with the US topographic map as a whole, as there is not enough definition on that scale. On the State-level, there usually is.

    The Method – Using Adobe Photoshop, I traveled up and down the coasts searching for any areas below 200 feet. I selected these areas and deleted them, turning them white (as the background, as you will shortly see.) All elevations remaining above sea-level remain filled as black.

    Errors – As I said, I’m not a pro at this. For many maps, the nearest scale cut off was 0-250 feet, or one or two were 0-300 feet or so. Meaning there will be at least a few areas that have been deleted which should not have been. Secondly, I assumed that this rise would also travel up the Mississippi. While I’m convinced a 200 ft. rise in sea level would travel at least some distance up the Miss., it would probably not rise to the levels I have given it (since there is obviously some sort of elevation change allowing the river to flow downstream). Third, working with only USGS maps, I was not able to take into account how flooding may breach the northern or southern states through Canada or Mexico. (I also did not apply the same 200 ft. rise up the Rio Grande, for instance, that I did with the Mississippi.)

    Anyway, for those doom and gloom people who want to see higher levels, maybe this will placate you a certain amount –

  117. Danny G said,

    6 July, 2007 @ 16:12

    Whoops –

  118.   Map Rising Sea Levels from Global Warming - One Man’s Blog said,

    9 July, 2007 @ 21:48

    […] Well, Alex Tingle now brings us the Flood Maps Website which allows you to see a visual representation of what will happen at varying levels of rising sea. He actually put a great deal of thought and effort into building this tool and even includes a detailed analysis of the level of accuracy you can assume – incidentally he claims the maps are actually optimistic, meaning sea level rise would probably be worse than the map projects. […]

  119. Annerose said,

    10 July, 2007 @ 15:23

    These comments have been invaluable to me as is this whole site. I thank you for your comment.

  120. dorothy said,

    10 July, 2007 @ 16:00

    Hi Alex,

    Two questions:

    1 Could you refine the maps with elevation data that are more accurate than NASA’s – USGS or state (US) GIS databases, other?

    2 With respect to tides – what reference elevation does NASA data reflect?


  121. Atlanta Luxury Homes said,

    12 July, 2007 @ 18:19

    Thanks so much for doing this – it’s something I wish could be made for the viewing for the politicians in Washington.

  122. John Hartley said,

    13 July, 2007 @ 11:31

    Hi Alex really great bit of work as I’m sure many people have already said. I’m an artist creating an exhibition about london being flooded and I wanted to know where you get your Nasa data from. What I’m doing is not about realistic scenarios, but the realisation of many scientists is that imagination shapes our perception of our surroundings much more powerfully than accurate data. Any chance of suggestions about how to make a map where Crystal Palace is a lone island? Currently I’m tracing OS maps…! cheers J

  123. Shilah said,

    6 August, 2007 @ 01:03

    VERY interesting. Thanks for all the work you’ve put into this project. I’m glad my mom (in Florida) can swim…unfortunately my stepdad is in a wheelchair… but for me, in northern Minnesota, I wonder how the rise in ocean levels will affect us. I think such a change in water levels & amounts will cause and affect temperatures all over the continent, and thus affect the rainfall amounts & hence Great Lake levels… I’m no expert, but I’ve been reading “Climate Change” & trying to understand. Seems like even a slight change in the temp of an oceran current can cause enormous changes on weather inland. (oh, yeah, el Nino…I forgot) So I’m guessing we better be ready for both: flood and drought.

  124. Midge said,

    31 August, 2007 @ 01:07

    I love the map. Been looking for one for a long time and it must have been a lot of work to build this excellent tool … however, I agree with others in asking for the map to include 100 meter rise.

    This is especially important now that the official date of total polar ice and glacial meltdown has been changed to 2020 and was covered by major network news broadcasts just a couple weeks ago. 2020 is just 13 years away and this melt and sea level rise will be progressive over the next 13 years. Frankly, I don’t think it will take half that long.

    While it is understandable that it is probably impossible to show the extent of sea level increase on the rivers, etc, the great lakes region is one area which should be included in the sea level rise maps. This is a huge body of water, tied to the ocean through the St Lawrence Seaway and this would affect major cities Chicago, Erie, Detroit and Cleaveland… just to name a few on the US side.

    Since this new 2020 meltdown estimate is less than 13 years away, the public should have the option to see what affect those sea levels may present on the location of their homes or businesses. Especially important since the sea levels will not be waiting until 2020 to rise. It will be a continuing process reaching maximum height in 2020 if this new official date is accurate. Either way, people will need to plan for those contingencies and use their own judgement to determine if they need to relocate.

    Once the sea level problem becomes too overt to ignore, the mass exodus and loss of coastal property values will become a nightmare. With cities like NYC, Boston, Miami, Washington DC, Baltimore, Houston, Corpus Christie, New Orleans, San Francisco, San Diego, LA, Seattle and the entire state of Florida will be a nightmare to relocated hundreds of millions in the US alone…. not to mention DC with all of the gov’t buildings, archives, documents museums, corporations, power plants…. just to name a few, will be of catastrophic levels in the US not to forget the entire globe…. so any tool such as a map which can help the public to start taking a serious look at their options would be invaluable to people around the world living in those areas.

  125. Simon said,

    8 September, 2007 @ 15:33

    Dear Alex,

    Great website! I saw it your earlier comment about making T-shirts with the flood map images on — have you made any further progress with this? I think it is a really interesting idea and one that is bound to get lots of interest and make people think.

    Kind regards,


  126. Flood Risk Assessment said,

    10 September, 2007 @ 14:19


    This is a great, user friendly flood map. The truth is that flood mapping and flood modelling are increasingly complicated and expensive affairs. Yet, the only parties remotely interested in the level of precision that can be achieved with the latest sims are insurers and risk managers. Most people will be happy to be told whether their house is at risk or not.
    How about a fluvial flood map along the same principles next?

  127. maning said,

    11 September, 2007 @ 07:20


    Inspired by your flood map. We created a similar map for the Philippines:


    This time we used SRTM DEM data for the elevation.

    The sea-level-rise script was derived using GRASS’ r.lake module. Starting from the coastline, the “module uses a 3×3 moving window approach to find all cells that match three criteria and to define the area: (a)cells are below the specified elevation; (b) cells are connected with an initial cell; (c) cells are not NULL or masked.

    The resulting raster map contains cells with values representing water depth”.

    This minimizes the problem of submerged “areas of the world far from the oceans that are far below sea level.”


  128. maning said,

    11 September, 2007 @ 07:22

    Rereading again your article I think we used the same SRTM data.


  129. David Page said,

    12 September, 2007 @ 17:37

    What a fascinating site you have developed. I have looked at where I live in Plymouth and, if the sea levels do rise by 14mtr ( + an extra 5.9 mtr for a Spring tide ) I will have a “Beach Front” house.

    There is lately much talk of around 80 Mtr sea level rises if all the Ice caps melt. Are you considering, as many seem to have inquired already, extending your site to cover up to, say, 100 mtr sea level changes.

    It has been 3 – 400 mtr lower in the past than it is at present, so a 100 mtr rise is not beyond the realms of possibility.

  130. Gwen Boucher said,

    23 September, 2007 @ 01:16

    Hello Alex:

    Your explanation seems to have covered my objections suitably. It is easy to see that 14 meters of flooding would flood far more of the city.

    I am writing a Science Fiction Novel and I forcasted about 200 Feet in my book simply to have something more dramatic to write about.

    I do notice that I am seeing many headlines that the “rate of melt” is constantly being revised upward. I suspicion that the melt off will be an exponential situation and that we will see significant disruption in the world in as little as 20 years. Just guessing.

    Many blessings

    Gwen Boucher

  131. Tom said,

    1 October, 2007 @ 18:14

    Thank you for your Flood mapping. I am a Amatuer Global watcher so to speak, I was interested in the Monterey California area. Having grown up there I noticed your model flooding certain areas. I had lived in Monterey for over 20 years and seen strange floods over the last ten years. DEl Monte Blvd near Lake Elestero that went under water about 2 feet. Did make it pretty rough for the lower vehicles.Not huge but something that had not happened in the time I was there previously, also a Hotel Holiday INN has an Upper and under ground parking area, Sad to say there was a extra high tide and those cars did not far so well in the lower sections. The water merrily went aound thier sea wall and looked like water going down a drain. From your map it was easy to see how the area would become flooded and the area that you marked flooded in the stages seemed on the money. Figure 20+ years living there you notice odd changes in weather.

    Thanks. Shows I am not totally mad

    Please Keep me up to date, be nice to know things that I may miss.

  132. Brad said,

    5 October, 2007 @ 01:47

    Alex, Great work you have done. Might I make a request. Your blue shading pixels are quite large. Any chance they could be at least a quarter of the size that they are presently? Mahalo, Brad

  133. Paul Klinkman said,

    6 October, 2007 @ 15:25

    Have you considered James Hansen and collaberators’ speculation that 3 million years ago sea levels were 25 meters higher than now? This was deliberately written into a global warming article.

    We must simultaneously be responsible to the credible skeptics, who honestly want to gauge whether global warming is much of a certainty, and be responsible to the world in general, who honestly want to know the 50% and 10% worst-case possibilities. Dr. Hansen does a service to the latter group in raising the possibility of a massive meltdown, based on historical records.

    Given that all empirical evidence of north pole melting is badly outstripping the theories, I’d like to see what a 25 meter ocean level rise would look like. For a bonus, I’d like to see what Greenland and Antarctica would look like post-melt.

    I live in Rhode Island, and I would hope that our bayfront property would be properly flooded (whenever you can get to that section). Half of our state’s buildings are in the flood area. Rhode Island could be half-gone!

    Thanks for listening, -Paul Klinkman

  134. John Melendy said,

    17 October, 2007 @ 03:18

    Since I am interested in try to visualize sea-level rise in Google Earth, I tried creating a similar type of overlay. Being very impatient, and a lot less concerned with accuracy, I simply used a groundOverlay to take advantage of GoogleEarth’s built in elevation data. This approach is very simple, but has a number of major limitations. The elevation data in the GE app appears to be pretty crude, especially outside of the USA. Also, the rendering is almost useless above about 10 miles view elevation. One great advantage is that the file can be edited to view any arbitrary sea-level rise. Since I am mostly concerned with creating perspective views of altered sea-levels as references for drawings and illustrations the limitations are not a problem for me. Other uses may get significantly less mileage.

    For those interested, a KML can be found here: and Hopefully, somebody can take that idea and do something more useful with it, or will be of some interest to someone else.

    Cheers, John Melendy

  135. John Melendy said,

    17 October, 2007 @ 03:19

    Actually, these links might work better:

    Sorry about that….

  136. jo said,

    20 October, 2007 @ 12:24


    Sorry, neither of your two links work for me.

    Perhaps there’s something I don’t know that you could please explain to me ?


  137. John Melendy said,

    21 October, 2007 @ 22:07

    I apoogize, this is my first attempt at doing anything in KML, so it is pretty unsophisticated.

    There also seems to be a mime type issue with the webserver hosting my files. I don’t have control over it, so there are a couple of things you could try. If you use IE7, it will download as a zip file. Either un-zip it, or change the extension to “.kmz”. If you are using FireFox, you will need to right-click on the link and use “Save Target As…”. Since it uses KML 2.2, you need to have a very recent version of Google Earth. I am using Google Earth 4.2.0198.2451, which is (I think) the latest one posted on the Google website.

    In terms of actually using it, I assume that you have the sidebar in Google Earth enabled. If not you will need to. Then pick the location on the coast that you would like to look at. You will need to be zoomed in pretty close to start with – the closer, the smoother the image. Once you open the .KML or .KMZ file, there should be some new layers in the “Temporary Places” section. I set up 1-meter through 7-meter layers. Check and uncheck the desired layers.

    If there is another problem going on, you can try emailing me at: jmelendy(replace this section with the appropriate character)

  138. Flood Risk Assessment said,

    1 November, 2007 @ 20:37

    Alex, you seem to have inspired a multitude to follow in your footsteps. I would be very interested to see the use of .KML or.KMZ more widespread.

  139. Sarant said,

    6 November, 2007 @ 22:15

    Working in disaster mitigation and emergency preparedness I am very interested in this forum. So many thanks. The api for Google Earth is very useful but the levels presented by John are false on my own floods experiences. On this site, the pixel level is not enough precise for my tasks. But all of you are on the good way for the next future.

    Please tell me when you reach a new step and I will tell you how it is corresponding with my back floods experiences.

  140. Mark Northrup said,

    9 November, 2007 @ 23:25


    I am a university student who will be doing a presentation on the effects of Climate Change for an assignment and would like to use some of your flooding images as part of my Power Point presentation. What is necessary for gaining the permission to do so. It would be used for strictly academic, non-commercial purposes and the source would be properly cited, of course.

    Thank You for replying in advance.

  141. Allan Pinvidic said,

    2 February, 2008 @ 22:03

    Hello, This is an interesting application. I have been working on a documentary about tsunamis and Cascadia Subduction zone earthquake that will cause a huge tsunami in the order of the 2004 Indian Ocean event. That event saw floods of over 30m in some areas. Various scientists along the west coast of North America are trying to model the tsunami danger zones. Although you have purposed this app. for global warming, tsunami could be another use of your application, in a simpler way, for people to know if they are in the danger zone or not. Coastal towns and cities could use this for emergency planning if they don’t have access to the latest CG tsunami modelling.

    NOAA in Seattle, Pacific Geoscience Centre in Victoria,BC and Oregon State University in Corvallis could, I think, also be interested in this.

  142. Amy Boleszny said,

    14 June, 2008 @ 11:14


    I thought you would like to know that our dumb government is about to pay out $2 million to do what you have already done.

    I sent Penny Wong the following message as I think your work should be recognised.



    I was horrified to find out that you are planning to spend $2 million on digital mapping to find out what homes/cities are likely to flood due to climate change when this work has not only already been done but has been available on the Internet from a reputable source for at least 2 years using quite sophisticated mapping technology and reported in the late lamented Bulletin!!

    Check out and

    The link from the Nova article is still operative and the full URL appears in the extract below as the short form of the URL does not always work. Teh map is able to be manipulated for the whole of Australia and for rises in sea levels in incremental values up to 14 metres.

    Sea level rise ( Shows map of Australia with possible sea levels due to global warming. Controls for sea level rise and zooming in on a region are available.,138.1640&z=13&m=7

  143. alberto said,

    30 September, 2008 @ 19:31

    Buenas tardes. Me van a publicar dentro de unos dias un artículo en un diario local, y me gustaría usar una imagen de su interesante página (flood map), para ilustrarlo. No percibo remuneración alguna y es para uso informativo (non-commercial purposes and the source would be properly cited). Eso pueden ustedes comprobarlo. Si ustedes me dan una dirección de correo les enviaré encantado el citado artículo, y si juzgan conveniente su publicación en alguna revista especializada. Lo hago porque hace un año que hice un estudio de la red de canales antiguos y perfil de costa de la zona de Jerez,(hoy a a 20 kms. del mar) hace tres mil años. También de la unión entre los estuarios del Guadalete y Guadalquivir, localización geográfica de Tartessos, y la antigua doble desembocadura del río Guadalquivir. Curiosamente, el nivel máximo de la cota de subida del nivel mar, que ustedes proponen en su mapa(14 metros), coincide al 100% con las conclusiones a las que llegué en el trazado de la red de canales que he estudiado, y con la descripción de la antigua linea costera que hicieron los autores clásicos (Estrabon, Avieno, Pomponio Mela…). El referido estudio saldrá publicado también este año, a finales. Les doy las gracias anticipadas por su amabilidad.

    Good afternoon. They are going to me to publish within days an article in a local newspaper, and I would like to use an image of his interesting page (flood map), to illustrate it. Collection remuneration some and is not for informative use (non-commercial purposes and the source would sees properly cited). That you can verify it. If you give a mail direction me I will send to them enchanted the mentioned article, and if they judge advisable its publication in some specialized magazine. I do it because a year ago I made a study of the network of old channels and profile of coast of the zone of Jerez- Spain (Sherry), (today to 20 a kms. of the sea) it does three thousand years. Also of the union between the estuaries of the Guadalete and Guadalquivir, geographic location of Tartessos, and the old double mouth of the Guadalquivir river. Peculiarly, the maximum level of the level of ascent of the level sea, that you propose in your map (14 meters), agrees to the 100% with the conclusions at which I arrived in the layout of the network of channels which I have studied, and with the description of the old coastal line which the authors made classic (Estrabon, Avieno, Pomponio Mela). The referred study will leave also published this year, to end. I thank to them anticipated by its amiability

  144. Carolyn said,

    26 November, 2008 @ 08:16

    This is a very useful tool. However, I am unclear why you are mapping sea level rise in metres and not centremeters. My understanding is that in the worse case scenario (e.g. melting of Greenland and Antarctic West Ice Sheets) sea levels will rise by 6-7 meters (relative to 1980-1999 as per IPCC) only and over many centuries. However, this does translate to 600-700 metres approx retreat of shorelines. The latest predictions for this century are for 80 cm rise which means shoreline retreat of 80 meters. Can you comment please?

  145. Aileen said,

    27 November, 2008 @ 07:12

    I love you so much! Great place to visit!,

  146. Kerry said,

    11 December, 2008 @ 07:40

    Can you modify the flood map program to allow for sea level rises of up to at least 40 meters? Because that is what things are looking like now….

    25 +/- 12 meters


  147. Toby said,

    15 December, 2008 @ 10:25

    I really like your flood map: fantastic work & it must have taken a long while to get right.

    In response to Ara Pacis’s comment above, there is a ‘flood map’ on Google Earth: download Google Earth ( and a .kmz file from and you can see +1 m and +4 m sea level rises and also the -120 m sea level probable during the Last Glacial Maximum around 20 000 years ago.

    I would like to emphasise, as mentioned by Michael Hoffmann above, that the current IPCC projections for sea level rise to 2100 on ARE ALL <1 METRE (; contrary to Dan Wynne’s suggestion that +6 m was “the most appropriate” level to be thinking about, or other more extreme suggestions above), although levels up to 1.5 m have also been suggested (e.g. I think it would avoid scare-mongering to have this mentioned somewhere on the site?

    Apart from potentially scaring people with a +14 m rise(which may or may not be a good thing), I thought your site was really good: by far the most user-friendly tool like this I’ve seen.

    Best, Toby

  148. Shawn said,

    12 January, 2009 @ 07:58

    An interesting map but with a flaw, allthough this map show sea level rise of up to 14 meters it does not show the greenland ice cap, antartica or any other ice caps receding…..So were is the water coming from.

    For sea levels to rise more than 14 meters some ice has to melt somewhere

  149. Talat Chaudhri said,

    13 January, 2009 @ 10:43

    For historical purposes, it would be interesting to see this working in reverse, allowing negative values and lowered sea level. Is this technically possible with the NASA data? Thanks for the interesting site: unavoidable innacuracies notwithstanding, it’s a great resource.

  150. Dr Peter Heffernan said,

    14 January, 2009 @ 07:40

    Great project.

    I doubt the coal fired power stations of Texas, India, China, and Australia, etc, etc, will be turned off in the near future. The contries involved seem to have only one solution-

    “Move to higher ground”.

    I would greatly appreciate access to a ’65 metre scenario’ map.

    Such a project might help us all to appreciate the potential catastrophe our world governments and the corporate giants are taking us to- not that I’m suggesting the planet would actually be habitable at the ’65 metre scenario’.

  151. Noel Ferguson said,

    14 January, 2009 @ 22:45

    Hi Alex

    I see that other people have asked a similar question, but could you perhaps rearrange some of the slots you have? I appreciate the limitation re bits – the following suggestions fit within that constraint while increasing the scope:

    0 to 5m – no change 6m to 10m 7m to 15m 8m to 20m 9m to 25m 10m to 50m 11m to 75m 12m to 100m 13m to 125m 14m to 150m

    To me this provides a more realistic scale based on current estimates. See the newspaper coverage of a recent Climatic and Biotic Events of the Paleogene conference in Wellington, New Zealand where people are talking 100m:

    Also, don’t worry about the naysayers and the people who are picking away at minor technical stuff (like Greenland and Antarctica still being on the map etc). You have done a GREAT job and their great-great grandchildren will thank you for it.

  152. Sal said,

    15 January, 2009 @ 21:16

    The readings that you have from +1M to +13M, is M in meters

  153. Liba Jelinek said,

    19 January, 2009 @ 04:48

    Hi I am trying to find all locations on Earth (liveable temperature locations only, preferably not too cold so one can grow food on the land for own supply) which are higher than 650feet above the seal level. Could I somehow get this information from your flood maps? Please let me know, if you do not mind…… Many thanks and kindest regards Liba

  154. Greta said,

    10 February, 2009 @ 19:34

    This site has really been on my mind since I came across it three days ago. Wow!! How long would this take to happen? I have seen videos of the Antarctic melting and it is scary. Should we be discussing this with our Governments here on the Sunshine Coast of BC? Should we be preparing? We are in Sechelt, British Columbia.

  155. Lars said,

    13 February, 2009 @ 19:44

    Alex, I and some colleagues are thinking up a project to mash up flood level data like yours with information on where endangered languages are spoken. The result would help visualize an approximate answer to the question, Which endangered languages would become even more endangered if the sea level rose e.g. 7m?

    I suppose we could technically use your RESTful tile server at e.g. as a data source to mash up, but that would put a load on your servers. Probably a small extra load compared to what you have now. But I wanted to check with you first. Alternatively, we could set up our own server serving the same tiles. But we don’t want to reinvent the wheel, and so would appreciate whatever help you are willing to offer, such as source code.

    Thanks, Lars

  156. Toni said,

    24 March, 2009 @ 15:02

    Thank you, this map was exactly what I was looking for. I’m not excited to know my house (near Greenville NC) will one day be “beach front property.” Especially since most sources of income here will be underwater and transportation nearly cut-off. Your hard work is very valuable. Thank you.

  157. Andreas Panagiotopoulos said,

    24 April, 2009 @ 12:55

    Hello Alex and thank you for the excellent work!

    Could you please tell me if I could extract these data to grid or other format? I am asking so, because I have downloaded Map Server and in my free time I am “playing” with it!

    Thank you in advance!


  158. Caroline said,

    5 June, 2009 @ 00:37

    There seems to be a black hole of data surrounding Narragansett Bay in Rhode Island. Your map shows ZERO effect there.

  159. mynorthtrip said,

    21 June, 2009 @ 16:37

    thank for map

  160. Mitch Chester said,

    6 July, 2009 @ 02:37

    Local governments need to start planning now for the effects of increasing sea levels. See article entitled “Rising Sea Levels- The Salt Water Solution” at

  161. Charlie said,

    24 July, 2009 @ 20:35

    hey why don’t you display up to 80m sea level rise to simulate the melting of the polar caps? That would be really interesting.

  162. Akatenvi said,

    28 July, 2009 @ 02:19

    Very interesting info. I wonder if you have any favorite models? I take it that you live across the pond. I used your model on Florida. I have seen some models project both a rise and fall of sea level, depending on the area and gravitational effect.

  163. Graeme said,

    5 August, 2009 @ 05:11

    Hi. Very nice work with this tool. Do you have any objections to me using you flood maps here

  164. BeBop said,

    21 August, 2009 @ 13:34

    Mr. Alex,

    Thank you for the maps and data. My simple suggestion is for you to change the semi hard to see grey to a bright blue. It might make the maps easier to read for some.

    Kind regards,

    Be Bop NYC

  165. Anatol Heib said,

    7 September, 2009 @ 08:17

    Hi from Switzerland

    I’m an editor from Switzerland an I have some questions about your Website. Please tell me your E-Mail: Thank you.

    A. Heib

  166. Dani said,

    26 September, 2009 @ 12:06

    I am unable to access the map at Is it still available for viewing?

  167. luisa teixidor sancho said,

    1 October, 2009 @ 11:38

    Hola ¡ I am most interested in your food map . Since 2 o 3 years ago I consuslt it from timr to time . The thing is that I have a pretty small house in the north-east coast of Spain, not far from the french border : the place is named Sant Martí d´Empúries : concretely El Riuet. Th thing is that my hous is located at 50 0r 60 meters far from the sea and I have a small river at 30 far from my samll house . I know it is a risk area and in fact, in the map it is remarked as it, with the blue color of the flood water .The question is : can you, please, more or less tell me when it can become a dangerous area ? I caculate in 50 years : one meter or more ¿ do you think that dikes or seawalls would resolve the problem ?? Thank you very very much from Barcelona, Spain

  168. Paul Syrett said,

    11 October, 2009 @ 09:29

    Hi, Great map and a valuable resource for the future. I was looking for a map solution to see the effects of seal level rises in between 20 to 40M. The reason was the results of the BBC news item on the revised CO2 predictions based on new sea core data – url CO2 levels of today, yeilded sea levels of 25M+ If you are able to amend the depth calibrations to those potenital rises, I think your data could make a lot of people think. Anyway Im off to make a jetty in the garden.

  169. Krishna said,

    26 October, 2009 @ 11:24

    Hello Alex,

    I am working on a project called prediction of impact due to sea level rise in coastal areas of India. Is it possible to get the area of submergence for every 0.1m level rise. if possible please inform how to do it.

    Thanks in advance

  170. Joy said,

    2 November, 2009 @ 07:12

    Hi Alex. Thank you so much for sharing your work. Is it possible to get the model you are using? I am working to promote solar parking lots in the states and will greatly appreciate this tool to use in order to better show why we do not want to build any more coal plants! I, too, live in North Carolina and the state has approved another coal plant, raise all electricity rates 4.5% and is now seriously entertaining Duke Energy’s request for another 18% residential rate increase! To pay for that bloody coal plant!

    ( I was stationed at RAF Mildenhall for four years, how am I doing with the cussing? Appropriately placed? Spelled ok? Back to the matter at hand ~ )

    The day to day citizen here in North Carolina really has no clue of the magnitude of the climate crisis. And the media seems to do absolutely nothing to enlighten them. It’s still a profit-driven society and honestly, I get rather discouraged at times. Then someone like you comes along and I know that I am not the only one working (and working bloody hard!) at getting our climate into recovery which entails a whole lot of beaming & shining positivity while you endeavor to get people to change their every (seems) way of doing things!

    Anyhoos, thx for the chat, and send along a Cadbury Flake with your model, eh?

    many smiles~ Joy King Chapel Hill NC

  171. Bernard MICHEL said,

    8 December, 2009 @ 13:48

    Loved your work !!! One meter rise is more than enough to put me underwater !!! I am in Cabo Frio , Brazil !!! Please let me know when ( and how ) we will be able to print that maps . Should be wonderfull to show in the schools I work . Bernard

  172. Rodney said,

    2 January, 2010 @ 08:03

    Hi, thank you for this sea level map display. When will you implement the ability to show a 50 m rise in sea level? This website alerts people to the very real consequence of carbon dioxide atmosphere concentration greater than .048%. Regards Rodney

  173. George Blahusiak said,

    7 January, 2010 @ 04:08

    Did you take into account rises and falls in continental plates. For exmple, in another place I see Norway is still rising owing to the loss of glaciers from the last ice age. Other places are sinking.

  174. George Blahusiak said,

    7 January, 2010 @ 04:09

    Did you take into account rises and falls in continental plates. For exmple, in another place I see Norway is still rising owing to the loss of glaciers from the last ice age. Other places are sinking. Antarctica is expected to rise by several hundred metres.

  175. Priscilla said,

    9 January, 2010 @ 09:19

    Quick question,if the global sea level rises 1m does this mean transgression and coastal retreat worldwide?

  176. rt said,

    18 February, 2010 @ 22:14

    any chance of putting a transparency control on these? thanks

  177. Jan said,

    3 March, 2010 @ 15:14

    The outcome for The Netherlands is wrong. Without human interfering for about 1500 years the low countries would be flooded by now. The current measures could withstand about a 2m rise in sea level.

    AFAIK the ice cap thickness from both Greenland and the Antarctic are raw estimates.

  178. JOHAN VRANKEN said,

    7 October, 2010 @ 20:34

    Hi there The reason I would like you to get scenarios up to 75 meters is simple: if all ice melts this is approx. the sealevel rise. And it is interesting to see where I cen choose my next living environment within the worst case perimeters. Since hard disk in the meantime is extremely cheap, I suppose the limit there is not really a burden any more, is it? Kind Regards Johan, Belgium

  179. Alexander Jacubowsky said,

    22 October, 2010 @ 21:07,-43.1575&z=1&t=2

    mistake in calculating: The hill is nearly 100m high, but flooded with 14m?

  180. S. Neelamani said,

    19 January, 2011 @ 07:13

    Thanks Mr. Alex for this wonderful work. We are planning to study the effect of sealevel rise on the coastal infrastructures in Kuwait. Your work is a pre-runner and I am using it to advocate what will happen to Kuwaiti coastal areas if sea level rises by 1m, 2m, 3m etc. Though the flooding area is approximate, we are getting some thought provoking informations to alert people what will happen to the important coastal infrastructures for diferent magnitudes of sea level rise. I appreciate your good work. Please keep my email in your alert list and share any new information you get on high resolution digital elevations and other informations related to impact of sea level rise.

    Dr. S. Neelamani Senior Resaerch Scientist and Program Manager of Coastal Engineering Program, Kuwait Institute for Scientific Research, Kuwait. email: /

  181. JC said,

    11 February, 2011 @ 02:04

    Any way to get Rhode Island data into your map?

  182. Ku Yee Kee said,

    13 February, 2011 @ 15:52

    amazing website! this is exactly the data that I am looking for.

  183. Wordpress autopost software said,

    20 May, 2011 @ 06:26

    Glad to see that this site works well on my Blackberry Bold, everything I want to do is functional. Thanks for keeping it up to date with the latest.

  184. Hakon said,

    29 May, 2011 @ 16:43

    I would like to see a +100 and +150 version, why you ask, well i have a very good reason, tsunamis, all coasts can be hit by them and the worst are about 150m high. this is assuming worst case scenario, but with the upcoming 2012 doomsday, a lot of people are curious and or worried about earthquakes and meteorites causing tsunamis, and the recent events in japan only heighten this curiosity, is there any chance you could make a tsunami level version for +100 and +150m thanks.

  185. Jack said,

    14 June, 2011 @ 08:33

    What a great project! I’ve heard some scientists say that increased ice melt could actually trigger some kind of reversal leading to a premature ice age. I wonder if your maps could be modified to include opposite values (sea level lower than normal), especially now that Google has ocean topography data?

  186. Best Futures Trading Systems said,

    20 June, 2011 @ 04:22

    Hmm it seems like your website ate my first comment (it was extremely long) so I guess I’ll just sum it up what I submitted and say, I’m thoroughly enjoying your blog. I too am an aspiring blog blogger but I’m still new to everything. Do you have any helpful hints for rookie blog writers? I’d definitely appreciate it.

  187. Jonny Barsby said,

    5 July, 2011 @ 15:53

    Hi alex. fantastic site! great help for my 3rd year dissertation project at university. Is it possible to download any of the images from the site? could you please respond to my email address! Im looking to forcast sea levels across the south west region of the UK, in particular the bristol channel coast to show the extent of coastal flooding… preferably across a 20 / 50 / 80 year period to show the relationship with climate change figures and the relationship between the two. If you can help me in anyway then please repond to me email! Would be highly appreciated! Thanks Jonny

  188. sharon sweat said,

    22 July, 2011 @ 17:42

    Yes, I live in Florida so , think about using your information in feet and not millimeters in the US we think in feet , inches had to look for a conversion table .

  189. jason YU said,

    10 August, 2011 @ 14:36

    Dear Sir,

    We would like to use the data provided by your site Flood Map in a program. Therefore, we would like to seek for your permission. Please contact me an email at so we can discuss this in detail. Thank you very much.
  190. Lamak said,

    30 August, 2011 @ 21:29

    Is it possible to input 60M+ level rise on your map. I know where the water level will reach in a certain part of the world & your limit of 60M just does not do it ???

  191. trudy said,

    8 September, 2011 @ 14:25

    What’s the jagged edge missing area in RI and Mass about?

  192. V. said,

    5 October, 2011 @ 09:16

    1. Congratulations – terrific job.

    2. According to some genious scientists, if all ice melts the land beneath it will rise, because it will be no more pressure that ice making.

    3. According to some other genious scientists, because some areas beneath sea level not conected in any ways with water it is another thing why sea level should rise even higher.

    4. According to some other genious scientists, even if we stop doing any impact on global warming all ice going to melt, it is just a matter of time.

    5. If we combine all this, we got 3 numbers that can look a bit science fictious but they are: 124 m., 154 m. and 180 m.

    6. Because NASA data is not accurate enough it could be even +16, so tatally maximum is 196 m.

    7. Because of coastal corrosion possibility +4, with total 200 m.

    8. I do not think so, what we will going to live long enough to see all these, if any of these will happen at all, that is why it would be cool at least to see a theoretical shapes of future planet Earth, so it would be really realy col to include 100 & 200 and any amount in between

    9. Thank You!

    10. Godspeed!

  193. Mark Huisjes said,

    10 October, 2011 @ 18:21

    Dear Alex Tingle,

    I’m a wikipedian working on articles about areas below sea level. Your images are unique on and off the net. They give an incredible insight in the geology of our planet and would very much contribute to the understanding of the general public. I would like to formally request the inclusion of low resolution images of +1m to the English wikipedia with a fair use license. Although I am legally free to include these images as fair use images I wanted to ask your permission and leave you the full ability to disagree or agree. If you do not agree than I will not upload anything to wikipedia. If you do agree this means that I will add low resolution images of areas below sea level to pages complying to the following rules:

    The images must ”be kept to a minimum of borrowed work” >> low resolution. The images must ”not devalue the original work(s) in any way” >> apart from not offering the changeable water level height it’s also not very detailed. If people want information about these points they still have to visit your site. The images must ”include a full acknowledgement of the ownership of the owner as well as the source from which the image was taken” >> ‘you are the owner’ and this is the site the image comes from ‘’. The images must ”stimulate creativity for the enrichment of the general public” >> educate people through wikipedia. The images must ”have been published” >> you did so already The images must ”have a certain usefulness to the public” >> considering climate change and hydroelectric projects in the area, it is important for everyone to know which areas lie below sea level and/or are threatened.

    I hope that you will agree with this proposal. If you want more information these two sites contain the entire legal structure about is: &

    About your site in itself I want to tell you that I enjoyed it very much. As I live in Holland this site and what it tells everyone is very important to me and us Hollanders, but sadly we forget about rising sea levels too often.

    Whatever you decide I would like to add a link in several articles to your site if that’s all right with you?

    With the highest regards, Mark Huisjes, alias AlwaysUnite.

  194. NathapolJ said,

    20 October, 2011 @ 02:08

    Many many thank for your effort. Hope this information help us for now SE Asia flooding situation.

  195. Rob Williams said,

    23 October, 2011 @ 20:33

    Congratulations Alex, on a very interesting map, & thanks for allowing we inet users to enjoy the fruits of your considerable efforts. Plse allow me to raise one point, which I trust will not make me look foolish. You state that “NASA claims their height data is accurate to +/- 16m with 90% certainty”. Surely, if that is the case, any height less than 16m will be less accurate, with 1m being especially inaccurate. If so, then it would suggest that using your map for the smaller values is almost a wasted exercise. I hope I am wrong, so plse tell me where my assumptions are incorrect. Cheers, & thanks again.

  196. mike mahlerler said,

    27 October, 2011 @ 17:46

    Global warming is a red herring. There is none. There is more ice on Greenland than there was when the Vikings left in 1350 AD. In 1950, when congressman Jim McDermott (D WA) was 14 there were 288 million people in Africa. The mighty Tse Tse fly kept the population in control. Now there are a billion even after the almost total elimination of the European population. Similar situation on all the planet. Everybody wanted to make babies but noone wants to cross the riveer styx. Now the ice age is upon us and the 2.5 billion in 1950 has become 7.0 billion. The problem is food. And too many nuclear weapons. Science has known of the cycle since 1985 when they started looking at ice cores. Why they have encouraged this warming bs is beyond me.

  197. Guido Vanhaleweyk said,

    29 October, 2011 @ 09:07

    Hello, I noticed hugely different elevations on maps about Bangkok. A recent map produced by Chulalongkorn University in Bangkok, has quite different measurements. Higher lying areas on your map (like Sukhumvit road at about 5 meters), are located at just around 1 meter above sea level on their map. Lower lying areas on your map then again seems to get higher readings. Is it possible that there are major errors on the Bangkok map. It read here that built-up areas may give erroneous data when measured by radar. Does that apply here? It would explain a lot, and would the map you display rather less useful. Greetings. Guido Vanhaleweyk, Bangkok

  198. Patrick said,

    11 November, 2011 @ 00:35


    Great Maps but I noticed a weird error – there are two geometric squares of land along the US East Coast when sea level is raised 60m. These areas are obviously supposed to be submerged.

  199. R.J. Archer said,

    7 December, 2011 @ 16:40

    I see that there hasn’t been a post here in quite a while, so you may not be monitoring this blog anymore. Unfortunately, I just discovered your flood maps so I’m going to give this comment a try.

    I’m keenly aware of the issues relating to global warming, etc. and I applaud your work with the flood maps and the message you hope to spread. HOWEVER, I’m interested in your maps for an entirely different purpose. I have a keen interest in some underwater research being conducted in the Bahamas which suggests that an ancient maritime culture once existed there. It would be a HUGE help if it were possible to run your model BACKWARDS and represent the coastal areas when the seal levels were LOWER, rather than higher. Specifically, I would like to go back to the end of the last ice age, when sea levels around the world were 120 meters LOWER than they are now. Would this be possible?

    R.J. Archer,

  200. Jose said,

    22 December, 2011 @ 06:58

    I am interested in this app more for historical education than Global warming and flooding, but what I would like to see is when the level of the oceans was at 50-60m below today’s level, and about 100m below today’s level during the last ice age 18,000yrs ago.

    A full melting of the polar ice caps today would imply a rise of about 70-80 meters, from what I have researched. The level of the oceans was: about 300m above the present value 95 millions years ago, about 600m above the present value 450 millions years ago.

  201. Allister McIlwrick said,

    26 January, 2012 @ 11:53


    My friends and I have been extremely impressed with the work that’s gone in to these maps – Thanks for your efforts.

    Have you considered including minus levels to show the effects on sea levels if there was an increase in glaciation?

    I recently read that at the height of the last ice age sea levels were arould 130 meters below current levels.


    Allister McIlwrick Edinburgh.

  202. Jon said,

    28 January, 2012 @ 20:07

    I like what you’ve done here, and I like that you state your maps are not accurate. I live in Denville, NJ, USA. Hurricane Irene in 2011 caused a 10+ foot rise in the Rockaway River, which flooded a good percentage of our town. However, even a 60 meter sea level rise on your map marks Denville as high and dry. You say that a truly accurate map would be alarmist. I do not agree. It is necessary to make our fellow humans realize the fragility of our eco-system.

    I do not agree that carbon emissions are the cause of “global warming.” The largest single contributing factor made by humans is the destruction of rain forests. Termites emit more CO2 than humans across the globe. It is our own narcissism that started this “global warming” scare to start.

  203. Mike K said,

    2 February, 2012 @ 04:49

    Looks great. Wonder if you could do the reverse. What did the coastlines look like 15,000 years ago when the water was 50, 100 or 200 meters down. That would be really cool. Just a thought…

  204. bobby wolff said,

    15 February, 2012 @ 23:43

    Hello, I would like to say that your map is a great help, and just to let you know, the melting of Greenland will have a huge impact on sea level. National Geographic has said that if they were to melt, it will increase the sea levels by 7 meters. Along with that, parts of the Antarctic can melt if Global warming keeps up. Some ice shelves have already melted.

    sincerely, lol :)

  205. Jeremiah said,

    28 February, 2012 @ 16:13

    Is there a way to turn off the text so that just an image is available for a given area?

  206. Vipa Hemstapat said,

    10 March, 2012 @ 21:26

    I lived in Nonthaburi, north of Bangkok thailand. My house and car were flooded for 2 months. It was a nightmare. I am now planning for retirement and looking for a place to settle down in my old age. Thank you so much for sharing with us this wonderful map.

  207. Pavel said,

    23 March, 2012 @ 08:51

    Can you please make negative of flood level? It will VERY usefull for historians. In the ice age sea level was lower than now, so many islands was peninsulas and humans travel there overland, not by sea.

  208. Mosaic Man said,

    8 June, 2012 @ 14:38

    I was looking at putting something together similar to what you are doing here. The Google API is however quite fragile in my opinion and for some time I have experienced difficulties with it. I note this post was written back in 2006 – have you noticed a degradation in the api functionality? I am thinking there maybe another way to make the calls…any thoughts on this?

  209. Aaron said,

    28 July, 2012 @ 11:41

    Apologies for double posting, but this site has maps of predicted fallout patterns from Fukushima like failures

    It would be great to be able to combine your maps with the data from this one as it may provide a more realistic look at what could happen if sea levels rise sufficiently quickly to prevent safe shutdown and decommissioning of nuclear reactors near sea level or near large sources of water effected by sea level rise.

    Not to be too much of a fear monger but I have been wondering about this ever since Fukushima.

    Thank you again for all of your hard work.

  210. rytyujstj said,

    11 October, 2012 @ 19:45

    Why doesn’t it show northern scandinavia?

  211. android uygulama said,

    14 October, 2012 @ 09:06

    I lived in Nonthaburi, north of Bangkok thailand. My house and car were flooded for 2 months. It was a nightmare. I am now planning for retirement and looking for a place to settle down in my old age. Thank you so much for sharing with us this wonderful map.

  212. Search Answer: Will the Plex be underwater? said,

    30 November, 2012 @ 05:16

    […] The thing I like about THIS map is that the author explains the limits of the accuracy of his data set (a practice I find deeply encouraging-I wish more places would do this kind of thing). See: here […]

  213. Richard said,

    7 January, 2013 @ 19:21


    I don’t know why but I was wondering why you chose to stop at 60m? Why not just let it run to 100m as an example. Why 60 and is there any way we can make it go to our heats limit?

  214. Gram said,

    13 January, 2013 @ 22:00

    I’m noticing a problem. Whatever I put in, three diamond-shaped areas stay dry. They are in Florida, the Carolinas, and Rhode Island. Could that be fixed?

  215. Howard said,

    14 January, 2013 @ 05:21

    Thanks ever so much for this! It’s an extremely useful educational tool. After the past two years of flooding in Queensland (Australia), insurance firms are starting to get serious about charging relevant premiums for flood-prone areas. That’s been a real wake-up call for at least some people. Friends of mine want to buy in an area that’s entirely flooded at just +3m. Given that your data & modelling are conservative, and that storm surges can add +4m, I really hope they reconsider.

  216. Meg Muckenhoupt said,

    4 February, 2013 @ 19:21

    Your simulation is actually optimistic–for Boston. For some reason, it doesn’t show Boston’s low-lying center as being flooded until there’s an ocean rise of more than 13 meters. The Boston Harbor Association put together flooding maps in 2010 for Boston following a 7.5 foot (2.5 meter) sea level rise during a high tide (ca. 11 feet/ 3.5 meters), for a total of ca. 6 meters.

    Those maps show a much broader region being flooded, partly because the dams on two of Boston’s tidal rivers (the Mystic and the Charles)will be overtopped and unable to control storm surges. See

  217. romerrr said,

    24 February, 2013 @ 02:03

    Great work Alex. I know from geologic history that sea levels WILL rise a total of 122 m or 400 ft as they have done several times in geologic history, regardless of what man does. Therefore, I’d would also like to see your maps to 122 m and categorically disagree that this magnitude of sea level rise are “people’s fascination with science-fiction scenarios”. As of about 1.8 million years ago, we have started incremental increasing towards that will maximum of a 122m rise.

    Keep up the brillant work!

  218. Egmont Ouerveture said,

    3 March, 2013 @ 07:43

    Can a 70m level be added?

    I ask because of

    4th paragraph of abstract:

    “Unless immediate and concerted action is taken by governments and oil companies to depressurize the Arctic subsea methane reserves by extracting the methane, liquefying it and selling it as a green house gas energy source, rising sea levels will breach the Thames Barrier by 2029 flooding London. The base of the Washington Monument (D.C.) will be inundated by 2031. Total global deglaciation will finally cause the sea level to rise up the lower 35% of the Washington Monument by 2051 (68.3 m or 224 feet above present sea level).”

    Current dropdown menu maxes at 60m. Is there data that far?

  219. Peter said,

    13 April, 2013 @ 22:01

    Excellent series of maps, Mr. Tingle, and really helpful to me–a great site. However, one caveat; 7 metres of sea-level rise are predicted from the failure of the Greenland ice-sheet, and 8 metres + 65 metres from the melting of both parts of the Antarctic ice-sheet–a total of 80 metres.

    Plus, as the ice is removed from Greenland and Antarctica, these two continents will start lifting up out of the sea and this will slowly displace water. This will lead to the sea-level rising further than mere ice-loss will cause.

    Therefore I would suggest that you increase the maximum flood-level on your map to 80 or 90 metres, which is about 300 feet above the present sea-level.

  220. Nat said,

    17 July, 2013 @ 18:20

    Would you ever considering developing a commercial app, using the same map tile method, but presumably no sea level rise data, for a client? Email me.

  221. Mitchell M said,

    9 August, 2013 @ 06:22

    Excellent site. I would say the best middle ground for people asking for extreme scenarios would be at 80 meters.

    Particularly because it’s estimated than an 80 meter shift is the maximum sea level increase possible if all ice caps melt. 100 meters is unnecessary because the Earth simply doesn’t have the water.

  222. moon said,

    12 August, 2013 @ 14:43

    could you add an additional option? – the different way? – take water away? – so we could see, how the earth would look when the water will sink 20 meters?

  223. s said,

    9 September, 2013 @ 21:48

    Follow question to the one posted about RHODE ISLAND. Given RI, USA’s land/water ratio (Narragansett Bay, Atlantic Ocean), it seems one might reasonably expect to see a lot of blue meaning no land left in many places. We’re unclear here what your map is indicating. Please help!

  224. Eric said,

    13 November, 2013 @ 18:15


    Great map. Is it possible to increase the value to +200 meters?

    I’m doing research for a school project and trying to see pre-ice age levels.

  225. Rini said,

    3 December, 2013 @ 15:32

    Hi Alex,

    Under the drop down, would you increase the sea lever rise up to +300m or at least up to +100m please? Thanks so much.

  226. Watering and draining the Earth (and other celestial objects) | ahstat webpage said,

    11 January, 2014 @ 07:19

    […] Flood simulation from 0m to 60m and the related blog post. […]

  227. Andrew Pollack said,

    27 January, 2014 @ 17:47

    I put in one meter for Israel and the land around the Sea of Galilee, Beit She’an area, Jordan Valley and eastern Negev were under water. I would really like to know why this is the case? And is all that land displayed really going to Be under water?

  228. Boris said,

    30 January, 2014 @ 14:22

    Great maps, and very useful for getting an idea of the geography during historic sea level rises.

    Would it be possible to take sea levels down to what they were during the last major glaciation, say -5m to -15m. I’m working on a project on Doggerland (UK) and this would be helpful to my research.

  229. Simon said,

    30 January, 2014 @ 19:06

    Hi Alex

    Fantastic map, I am using it to identify land levels in the past, and wonder if its possible to link your maps, and then overlay google points on top of the map to show historic information.



  230. Boris said,

    2 June, 2014 @ 06:23

    Hi Alex.

    Hope you are well. My Doggerland project is now getting to the stage where I could do with the maps showing the land mass around Britain prior to the post glacial sea level rises. Please let me know if this is doable, otherwise I will have to look for alternatives.

  231. David Friedman said,

    4 June, 2014 @ 03:21

    A poster some time back writes:

    “As of july 2006 rises of up to 120 metres are seriously being discussed should the Greenland icecap melt.”

    It’s worth doing a little arithmetic before taking such claims seriously.

    The Greenland icecap has about 2.9 million cubic kilometers of ice. The area of the earth is about 500 million square kilometers—say 300+ million of sea. So a sea level rise of 100 m requires about 30 million cubic kilometers, ten times the volume of the entire Greenland icecap.

    I like your web page, but I’m afraid I use it for the opposite of its intended purpose, to point out to people how small the effect is of sea level rise on the scale actually suggested as of 2100 by the current IPCC report. 1 m is slightly above the outer bound of the range of additional sea level rise in the highest emission scenario.

  232. Juan-Emil said,

    6 October, 2014 @ 13:08


    I find the site very useful. I was wondering if there is a similar google map api that allows somebody to see the effect of a 1:50 year or 1:100 year flood in the landscape if a river or dam would to burst its banks.

  233. Dr. Alison Nock said,

    17 November, 2014 @ 17:22


    I would like to seek permission to use an image from your website in my PhD thesis which will be available online at the University of Plymouth and British Library online systems. My coastal flooding thesis was funded by NERC and the DEFRA. Please contact me at the email above.

    Hope to hear from you as soon as possible.

  234. Alexandre said,

    4 May, 2015 @ 13:38


    I was wondering, how can we find the amount of earth taken by the sea level rise? I am mostly interested in the surface which would be lost if the sea level rised to 1m (–> 0.98 m for the worst scenario, according to the IPCC).

    Tnahk you!

  235. Kent Fredric said,

    5 May, 2015 @ 00:16

    Admittedly, there are so many comments here you probably have little motivation to read them.

    I was roughly correlating your map with the damage dozens from the 2004 boxing day tsunami/earthquake and saw that the affected regions were well above your maximum waterlevels.

    Granted Tsunami dynamics are subject to terrestrial amplification/momentum effects, but I was curious in amping the levels to get a “Ballpark” guess for what areas /could/ be affected.

    Thanks in advance.

  236. Alexander said,

    4 July, 2015 @ 13:56


    Great map. I would be very interested in seeing options for higher sea level increases, perhaps up to +100m or even beyond. Would this be possible?


  237. Pamela said,

    7 August, 2015 @ 12:02

    Hello Alex,

    May I use captures of your images in a dissertation (that may be posted online since we submit with a digital copy) with credit to this page and you?

    Thank you.

  238. Paul B. Gallagher said,

    9 October, 2015 @ 22:18

    This is fun stuff, thanks. However, there are several obvious artefacts that should be fixed: 1) diamond of land west of Jacksonville, Florida that survives at high water levels even though the coastline recedes north of the state line; 2) similar diamond at the South Carolina/North Carolina state line; 3) large dark blue rectangle (seawater?) in Lake Superior. As for the area north of the Caspian, the Black Sea already connects to the global ocean at the Bosporus (which Ryan & Pitman think was carved out by water flowing in from the Mediterranean), and if it also connects to the Caspian Sea as you show above +30 m, seawater will surely flow up the Manych River valley into the Caspian and flood the parts of Qazaqstan shown.

  239. Vincent Dert said,

    13 October, 2015 @ 16:22

    Hello Alex,

    I like your program, but have a question. Being Dutch I know that almost half of the Netherlands is already below sea level. Many parts for many meters. But when I select a zero meter sea level rise, the maps only show a few dots here and there where the land would be below sea level. How can that be explained? It must have to do with the assumptions made. Does the program assume that land now “dry” is therefore above sea level, essentially ignoring the fact that there are huges dikes keeping the water out? I know it will be difficult to correct for dikes and so on, but I only want to know the “why”. Otherwise great work!


    Vincent Dert

  240. alex said,

    13 October, 2015 @ 17:19

    Goeiedag Vincent,

    You are quite correct, the “0 meters” level is a cheat. It simply shows the current coastlines. As soon as you go to +1m, it stops cheating.

    Of course, this very simple model cannot know about dykes, or coastal erosion. I was originally eager to add that, butr eventually I decided that any model I produced would be incredibly subjective. I prefer the application as it is.


  241. alex said,

    13 October, 2015 @ 17:19

    @Paul B. Gallagher – The artefacts are all in the source data.

  242. David Friedman said,

    22 February, 2022 @ 05:33

    I like your page, but I recently came across an article: “Maps of Lands Vulnerable to Sea Level Rise: Modeled Elevations along the U.S. Atlantic and Gulf Coasts” by James G. Titus & Charlie Richman, which has a map of the East Coast showing what it claims is the 1.5 m contour. It shows a much larger flooded area than your page does at 2 m. I don’t know if for some reason their map isn’t comparable to yours — they also claim to be going off topographic data — or if either yours or theirs is wrong, but I thought you might want to look into the matter.

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