Change detection and ratio

[ABraun]

there were some issues with the terrain flattening module as reported here:

Artefacts in S1TBX radiometric terrain flattening

I ran some comparison tests on the S1TBX radiometric terrain flattening, using an IW GRDH image from the region SW of Vienna, Austria. I flattened the backscatter first using my own software using (a) SRTM3, and (b) SRTM1, and compared it with backscatter retrieved after flattening and terrain correction in SNAP (Cal_TF_TC). It is worth noting the SNAP v2 beta 06 cannot be used for such testing, as the radiometric calibration is off by over 30dB in general. I therefore had to use SNAP v2 beta…

I don’t know if it is resolved yet but I can remember that it worked better in earlier versions.