Terrain Flattening results are currently underperforming

[maawoo]

https://forum.step.esa.int/t/inferior-terrain-flattening-results-when-using-external-dem/37221

[johntruckenbrodt]

Thanks for the great summary in this STEP issue. It was increasingly hard to follow the discussions around this topic. Let's hope they soon come up with a fix.

[johntruckenbrodt]

Things are moving forward:

https://forum.step.esa.int/t/terrain-flattening-results-in-garbage-when-using-copernicus-30m-auto-download/33777/34

The reason that the TF result obtained using auto downloaded Copernicus 30m DEM is different from that obtained using external Copernicus 30m DEM file is that the DEM oversampling factor is computed differently. The oversampling factor is computed using the DEM resolution and the image pixel spacing. In the former case, the DEM resolution is given while in the latter case the DEM resolution is computed using Earth model. We have updated the oversampling factor calculation so that it is the same for both cases. The fix will be available in the next release.

[maawoo]

Finally! 🎉 Thanks for the update!

[johntruckenbrodt]

https://github.com/SAR-ARD/S1_NRB/pull/78 should bring some improvement. To be revised once the new version is out.

[johntruckenbrodt]

https://github.com/senbox-org/s1tbx/releases/tag/9.0.3