I have this problem with my images of the Ross Ice Shelf: enter image description here

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 enter image description here

This is what happens when I add Geometric - Geolocation - Ellipsoid Correction - Average Height Range Doppler

enter image description here

This is what the image looks like on Copernicus preview: enter image description here

Any suggestions? I'm at a loss

  • what output coordinate system did you select? Maybe it is worth comparing different image resampling methods. It looks like there is some NoData value imputed.
    – AndyB
    Jul 14, 2020 at 7:34
  • This is level-1 GRD EW, I selected Stereographic South Pole
    – Lizzie
    Jul 14, 2020 at 14:17
  • please select Nearest Neighbor as interpolation method during the Ellipsoid Correction to see if it makes a difference. Also try WGS84 as reference system for a test.
    – AndyB
    Jul 14, 2020 at 18:14
  • No luck on the Nearest Neighbor or WGS84
    – Lizzie
    Jul 17, 2020 at 1:22

1 Answer 1


Problem solved: it does not happen in the previous version 6 of the SNAP software. I was using the latest version 7. Fixed by uninstalling new software and installing a the older version.

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