I have this problem with my images of the Ross Ice Shelf:
This is an image that has been Radar - Radiometric- Calibrate- Amplitude_HH - Gamma0 followed by Speckle Filter.
This is what happens when I add a Geometric - Geolocation - Ellipsoid Correction - Geolocation Grid
This is what happens when I add Geometric - Geolocation - Ellipsoid Correction - Average Height Range Doppler
This is what the image looks like on Copernicus preview:
Any suggestions? I'm at a loss