so there are nearly no additional open water areas in the flood image. In the easiest case, these areas are as black as the sea surface and therefore the difference is larger. In your case, the entire image looks a bit darker and the question is if this was caused by phenology or water under the vegetation. Whats the predominant land use in these darker areas?
Please have a look here
- https://forum.step.esa.int/t/flooded-vegetation/27372/2https://forum.step.esa.int/t/flooded-vegetation/27372/2
- SLC or GRD for Water-logging in urban areas
- Flooded Vegetation
- VV and VH Polarization
- Towards Sustainable Land Uses within the Elbe River Biosphere Reserve in Lower Saxony, Germany by Means of TerraSAR-X Images