Uday, N.G. ; Purse, B.; Vanak, A.T.; Samrat, A.; Chaudhary, A.; Gerard, F.

Radar derived seasonal surface water maps for three Indian districts (Shivamogga, Sindhudurg, Wayanad), 2017-2018

https://doi.org/10.5285/3c23fea1-5b27-4b01-b9ef-fc13346cfedc Cite this dataset

Data provided are monthly surface water layers extracted from Sentinel1A SAR data for 3 districts in India (Shivamogga, Sindhudurg, Wayanad) for the year 2017 and 2018. Surface water body layers were mapped using an average monthly threshold value extracted from the image backscatter histogram. The average threshold value excluded the monsoon months due to the difference in water and not water area. The threshold value was slightly lesser than the mean threshold value. The end product was validated using field data which resulted in user and producer accuracies. Monthly surface water body layers were not produced for a few months due to the non-availability of Sentinel 1 data.

The work was supported by MRC, AHRC, BBSRC, ESRC and NERC [grant number MR/P024335/1] and NERC - SUNRISE project [grant number NE/R000131/1]

Publication date: 2022-02-15

Format

TIFF

Spatial information

Study area
Spatial representation type: Raster
Spatial reference system: WGS 84

Temporal information

Temporal extent: 2017-01-01 to 2018-12-31

Provenance & quality

Maps were generated using Sentinel1A GRD data pre-processed to backscatter images using the SNAP software.

Surface water is identified by applying a water/non-water threshold on the SAR backscatter images. The resulting maps were validated against in situ reference data to produce a measure of class user’s and producer’s accuracy.