Hi,
I'm facing solid troubles when trying to apply Terrain Flattening then Range-Doppler Terrain Correction processings on a bunch of VV-VH .dim (BEAM-DIMAP format) using SNAP (9.0.8).
Input images are already subset (from original swath), flipped (according to orbit) and calibrated. As my ROI doesn't display a flat terrain, I need to apply a Radiometric Terrain Flattening to normalize backscatter coefficient values. Then, I have to apply a Geometric Terrain Correction in order to georeference the image and be able to use it for further segmentation with terrain-surveyed polygons.
These two processings accept a user-DEM in input, so I provided a 5m-DEM (higher resolution than my 10m VV-VH images) in WGS84 format (height in meters). I didn't change any other parameters and used default values. But whatever I'm doing, I always get weirdly cropped/distorted images in output; and it's definitely not consistent with my DEM extent.
I attached a screenshot of VV-VH images at calibration, terrain flattening and RD terrain correction steps; and my 5m-DEM. You can see views-synchronized cursor.
If anyone could help me out on this, as I'm a new user of SNAP and it's quite an urgent matter (as always)!