Officially published by ESA on October 1st, the raw image (2021-09-30) is already available at Google-Earth-Engine , where you can manipulate with a simple code filters and thresholds for edge detection. In this demo we used a true color background shifted to reds, and a Normalized-Difference (B4 red, B11 SWIR 1) index for the lava flow. Check the code here .
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During the flood peak and afterwards is essential to track water levels, boundaries and flow speeds, all assisted by drone. This data is needed to interpret and validate Satellite Imagery, mainly the non-visible SAR from Sentinel-1. Look here 3 survey points we observed during the last flood at Mid-Ebro.