Terrain flattening outputs empty VH channel

Microwave Toolbox
#1

Hello everyone

I have been running some tests with SNAP before moving to snappy, but I have found a problem I do not know how to solve: After running terrain flattening, the VH channel is empty (the image only contains zeroes). What I was applying was the chain:

  1. Apply orbit file
  2. Thermal noise removal
  3. Border nose removal
  4. Calibration (to beta0)
  5. Multilook (from 10 to 30 m)
  6. Terrain flattening (default parameters)

I have been running tests with different images (I tried in several PCs, one with windows 1, one with Kubuntu and forgot the specific granule), the current one is

S1B_IW_GRDH_1SDV_20200713T161636_20200713T161701_022455_02A9E6_F571

However, no matter the operative system, the VH channel was empty

This has happened to anyone else? Am I doing something wrong?

All the best,
Ignacio

1 Like
S1 VH contains only NaN values after Radiometric Terrain Flattening
Region merging segmentation outputs empty raster
#2

This is a known issue and has been fixed. The fix will be in the next release

1 Like
#3

Thanks a lot @jun_lu, I was pulling my hair scrambling to find the error, I will wait patiently for the fix :slight_smile:

Do you know what is the patch release schedule? (to know when to go back to the tests)

#4

I think it will probably goes with release 8 shortly in the near future

#5

The release 8 snapshot I built does correctly output VH data from terrain flattening.