Looking For Flood Data from ISRO BHUVAN

[bibhu prasad mishra]

  Hi,

I need the shapefiles from the following  Link , Flood zonation data for Assam and Odisha.  Let me know if anyone has shapefiles.

 https://bhuvan-app1.nrsc.gov.in/disaster/disaster.php?id=flood_hz 


Thanks
Bibhu

[Dammalapati Sai Krishna]

Hi Bibhu, I worked on this dataset a couple of years ago, but for the inundation maps as GeoTiffs. I hope some of it will help you download flood zonation maps—it seems like the zonation is also a raster and not a shapefile. 

This code will help you download the flood maps of the required geography in a GeoTIFF format. You'd have to find a WMS layer for flood zonation maps.

I initially did not find the WMS layer, so I went on an unproductive way and downloaded each of the 256*256 pixel PNG files of the required geography, stitched them together, and georeferenced it. I detailed the process here:Tailoring flood images 

Best, 

Krishna

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[sreeram kandimalla]

Couple of things..

It is not widely known but it is possible to get vector data out of some of the bhuvan WMS endpoints as GeoRSS. This technique has been solidified into a tool at https://github.com/ramSeraph/pywmsdump . Not every layer might have that setting enabled.. so luck will play a part.

The flood inundation layers have already been retrieved from https://ndem.nrsc.gov.in/ and are available at https://github.com/ramSeraph/india_natural_disasters/releases/tag/floods. I merged the various layers available at the site based on some heuristics and what felt related and posted there( they can be separated out using some of the property tags available in the vector data ).  For a more serious analysis I recommend picking and downloading the layers you want from NDEM directly. 

In this particular case it looks like the hazard data is available in the ndem website - 

1) With uv installed run  "uvx --from wmsdump wms-extractor explore -g https://ndem.nrsc.gov.in/geoserver_v3_50d/ -o layers.txt" to collect the list of layers available to the layers.txt file and look for the layer you need.. There seem to be quite a few flood hazard layers available with "hz" in the name. 

2) Once you identified the desired layer run "uvx --from wmsdump wms-extractor extract --geoserver-url  https://ndem.nrsc.gov.in/geoserver_v3_50d ndem50d:asfhz50dsc1998_2023" to download the layer to a local geojsonl file. Here "ndem50d:asfhz50dsc1998_2023" is to be replaced by the layer you desire to download.

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