While testing Sentinel-1 data I’ve noticed that after performing Terrain correction (in S1tbx) the processed image contains offset compared to other non-Sentinel-1 data with the same projection. After noticing this issue I processed multiple Sentinel-1 scenes and found out that the offset is irregular between different scenes (scenes from different dates).
Processed files: Level-1 GRD product and IW mode.
Processing steps: -> apply orbit file (Sentinel precise) -> Calibration -> Speckle Filter (Refined Lee) -> Terrain correction (with SRTM 1sec grid, UTM/WGS 84 (Automatic))
It seems that the issue appears during the process of geocoding. What could cause this kind of effect?