Flood detection using Sentinel-1 and Sentinel-2 fusion - #654
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Adds an algorithm that fuses Sentinel-1 GRD and Sentinel-2 L2A imagery to detect flooded/water surfaces as an openEO UDP.
The openEO process is adapted from the S1 Flooding Visualisation evalscript by William Ray & Maxim Lamare. Each pixel is rendered by a single-date, two-way classification: Sentinel-1 VV backscatter is converted to decibels and thresholded —pixels below the threshold render blue (flooded/water), while every other pixel falls back to the Sentinel-2 NIR background rendered as grayscale.
The openEO process is running on Copernicus Data Space over the spatial extent of Thessaly, Greece on 2023-09-06 to 2023-09-11 (2023 Storm Daniel floods), and has also been validated over the Severn River, UK on 2024-01-26 to 2024-02-29.