Flood plain maps for Maharashtra

[pad...@cornell.edu]

Hello,

My name is Parth, and I am a graduate student at Cornell University. We are focusing on coastal tourism in the state of Maharashtra, and I am having trouble finding the GIS data, for areas which might be affected due to Sea level rise.
Would anybody be able to help me out?
Thank you!

[Sandeep Kumar]

What do you exactly need areas under sea in future

[Samuel Rajkumar]

Wouldn't any global elevation map suffice? https://asterweb.jpl.nasa.gov/gdem.asp for instance?

[Vaishnavi Jayakumar (Inclusive India)]

Not quite in response to your query, but related to recent flood discussions - take a look at cloudtostreet.info

Also:
https://www.devex.com/news/opinion-data-driven-preparedness-for-disaster-88950
https://www.youtube.com/watch?v=wiWSNh6zUSo
https://landsat.gsfc.nasa.gov/mapping-historic-floods-around-the-world/

Social Entrepreneurs Predict Flooding Risk In Vulnerable Communities

forbes.com/sites/annefield/2016/09/21/social-enterpreneurs-predict-flooding-risk-in-vulnerable-communities/

9/21/2016

Anne Field 

As climate change causes more potentially catastrophic flooding across the globe, the need to predict what areas are the most vulnerable  becomes more urgent.

That's the issue Cloud to Street is addressing, combining big data analysis, crowd sourced information from people on the ground and satellite imagery to create what co-founder Bessie Schwarz calls a "living vulnerability assessment."The startup recently  took part in a pitch event at SOCAP2016 in San Francisco.

Basically, the startup creates maps that determine and displays flood risks for anywhere in the world, with an analysis of which communities are most vulnerable because of their underlying social conditions. For example, in one area, it might turn out there's a connection between having a large older population and higher risk of  extreme damage from flooding. According to Schwarz, although roughly 16% of  New Orleans residents were over 60 when Hurricane Katrina hit, 75% of deaths were from people in this age bracket.

But it takes a lot of leg work. Part of the data comes from satellite imagery, much of which was originally generated by NASA . But another chunk is from people on the ground--the communities that have experienced flooding."We need to know whether those pixels are of your street and if so, did it really flood there and what happened," she says.In fact, the social conditions connected to flooding are as important as the satellite  data, because they provide the most insights into what causes a community both to experience greater losses and be less likely to recover. 

For example, a flood map of New York State in 2014  showed that  major characteristics of at-risk places included a preponderance of female head of households/ lower median house value and poverty. Also, the characteristics of social conditions are different from one region or country to another. "The conditions that make communities more at risk in Senegal are not necessarily the same ones you find in the ninth ward of New Orleans," says Schwarz.

Schwarz and  co-founder Beth Tellman got started when they were graduate students at Yale's School of Forestry and Environmental Studies in 2013. There, they got involved with a project spurred on by Google Earth Outreach, which has a tool for processing satellite imagery. Tellman, a hydrologist who had previously worked on disaster relief in El Salvador, immediately remembered instances during which people didn't get the help they needed thanks to faulty maps. Schwarz had worked as a community organizer on climate change-related disaster relief in the U.S., and saw the need to gather input from those on the ground.

Then, according to Schwarz, they were approached by World Bank officials in 2014 trying to get a better understanding of what happened when disastrous flooding in the north Indian state of Uttarakhand killed almost 6,000 people. But it wasn't until early 2015 that the founders decided, says Schwarz, "We need to make a company out of this."Now, they're running pilots  in Senegal and India, as well as part of the U.S. because, says Schwarz, "There's great data here."  The target market is development banks that work with governments and NGOs.                                                                                                

---------------------------------------
VAISHNAVI JAYAKUMAR
http://about.me/vjayakumar

[Dilip Damle]

Hello, 

I normally used SRTM fro all my DEM needs. But thanks to this post. I looked at the option of aster as well as found another source.
That is from Jaxa named as ALOS world 3D. 

All the three sources have slightly different data. 

The ALOS gives 6 different files 3 for Median and 3 for Average 

Need to figure out what they are. But I checked all three sources for a region I am currently working on and have some Physical knowledge. 

They seem to differ on what they catch in their sensing.

It is too early to say but I think SRTM catches tree tops. 

Will report on my findings later. This link also tests them and compares.

http://www.digital-geography.com/dem-comparison-srtm-3-vs-aster-gdem-v2/

http://www.digital-geography.com/comparing-alos-global-digital-surface-model-alos-world-3d-30m-with-srtm-1/#.VhbVOyt_89s

[Ma-roof M]

Hi,

Has anyone tried the CartoDEM product from cartosat available at http://bhuvan.nrsc.gov.in/data/download/index.php ?

Would this meet your requirements?

Best regards

Mahroof

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[Arun Ganesh]

On Mon, Oct 30, 2017 at 5:56 PM, Ma-roof M <mahr...@gmail.com> wrote:

Hi,

Has anyone tried the CartoDEM product from cartosat available at http://bhuvan.nrsc.gov.in/data/download/index.php ?

Tried it for the Chennai Flood map and found that it has issues with the values not corresponding to actual MSL values in meters. Also, there were quite a few data artifacts and bands of band data which probably required some post processing cleanup. 

Have not checked back in 2 years, so maybe these have been fixed now.

[yash.meht...@cept.ac.in]

Hey Parth, 

I am Yash Mehta and I am studying masters of urban and regional planning at Center of Environment Planning and Technology. 

I am doing by Masters Thesis on Tracking the Smart Cities on the lines of sustainability and I need similar kind of data for India. 

Also we have a great GIS lab at CEPT, Ahmedabad. I can see if I can get any GIS data. Lets get in touch. 

Where you able to find any data yet ?

Regards,

Yash Mehta 

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[archi planner]

Hi Parth,
I don't know if you are still looking for this data. I used sea level rise data for whole of Indian coastline. Though this data is a lil dated, the AR-5 of IPCC didn't change the extent or depth of inundation for the same. I can dig them out for you. Do let me know!

Best,
Archi

[Supriya Krishnan]

@Archi and @Parth > I am also working on urban planning and climate change.

I am looking for sea level rise maps (as a GIS) for the Mumbai metropolitan region coast. Any leads would be great.

Thank you in advance.

Best,

Supriya

[Nikhil VJ]

Hi,

Replying on the original subject, this gov site has river basin maps. From "flood plain" I first assumed it's about rivers and monsoon flooding; not the sea.

https://mwrra.org/maps/

-----

On the sea level rise matter, a prerequisite dataset for creating the coastal flooding scenarios you guys want, is : sea level rise numbers over time. So, locating that data - simple yearwise numbers probably - might be useful. One can take those and generate all the maps they need using the mentioned elevation data etc.

What I've seen so far is interactive simulations where people key in how much they want to raise the levels and then the program gives output. When I found one such site some years ago, I had to set the value sky high to see some real action - but it was totally unrealistic.

some links related from a quick web search:

https://en.wikipedia.org/wiki/Past_sea_level

https://en.wikipedia.org/wiki/Sea_level_rise

https://www.e-education.psu.edu/earth107/node/1506

https://coast.noaa.gov/slr/ - this simulator (for USA coasts only) starts at 1ft, which is as per the numbers on the wikipedia article would be multiple centuries in the future. Not sure if humans will still be doing coastal tourism / real estate purchases at that point. We're seeing populations of millions moving between continents in present day - it looks a little too far-fetched to assume the affected peoples covered in these maps won't move at all over the span of centuries.A once in a decade storm generally causes far more sea surge and temporary inundation, so one can expect that peoples and governments involved will have/need arrangements going above and beyond these sea level rise extents. Don't want to be rude, but I'm seeing a gap between the buzz and reality here.

And since this topic has been going around for over 2 decades now or more, it would be great to see a comparison between then-projected sea level rise versus actual sea level rise, to catch if projection models have under/over estimated anything and make corrections.

--
Cheers,
Nikhil VJ
https://nikhilvj.co.in

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