I have pre-processed a Sentinel-1 GRD tile. The steps include: Thermal Noise Removal, Calibration, Speckle Filtering and Terrain Correction. I’ve used the 1 arc second DEM.
However the hills don’t look correct. Anyone know why this is?
Range Doppler Terrain Correction only corrects the geometric distortions caused by the looking angle. The radiometric effects are still present, e.g. over-illumination of slopes facing the sensor.
To compensate for these effects, you have to include Terrain Flattening: