Extract Sigma0 values for a region

development python
1

I have a script which uses Snappy and does the following operation on it:

  • Orbit File
  • Calibration
  • Speckle Filtering
  • Terrain Correction
  • Subset

Now the Subset is taken over a region of area i.e. I have a Polygon value:
wkt = “POLYGON((…))”

Now what I want is to extract the Sigma0 values from all the pixels in the region specified in the Polygon. I saw a few discussions similar to this, where certain classes were being mentioned but I couldn’t quite get it. It would be appreciated if I could get some more clarity on what to use and how.

Thanks in advance!!
P.S. I am a beginner in using the snappy package

2

Could you please specify what you mean with “extract all pixels“?
Their coordinates, their values? To what format or file structure?

3

By “extract all pixels” I mean, all the pixels which belong in the POLYGON((…)) which is the region of interests. So I need to find which pixel indicates the lat and long values in the POLYGON and what is the corresponding Sigma0 value so that I can print them.

4

The csv export should work then.
In the write tab of the graph builder select “Save as:” CSV instead of BEAM DIMAP.

5

Thanks for the solution!! So even in python I could just simply write, ‘CSV’ instead of ‘BEAM-DIMAP’ in writeProdouct function??

6

I have never tried this, but I think so.
Sorry, I have not seen that this topic was opened in the #development:python section.