Codec error on some Sentinel SAFE zip files? about isce2

[hardreddata]

Hi @piyushrpt

Thanks for the code snippet, and your help.

The problem was zipped orbit data!

The difference between downloading from https://qc.sentinel1.eo.esa.int/aux_poeorb/ and http://step.esa.int/auxdata/orbits/Sentinel-1/POEORB/S1A/2020/11/ ; If I unzip the zipped orbit files everything works fine.

I must have discovered that second site when looking at relative orbit 147, after first looking at relative orbit 9.

[piyushrpt]

Were those zip files ever copied onto a windows machine and modified there? Seems like a cp1252 vs utf-8 issue.

Also, can you verify that those zip files were downloaded successfully and are the same size as reported on scihub / at ASF. If the zip file was recreated on a windows machine - this could be an issue.

[hardreddata]

Thanks for the reply. I downloaded direct to linux from https://scihub.copernicus.eu yesterday. I assume the error pertains to the SLCs as it speaks of the swaths. I note they had some IT issues but the other files were ok. My memory suggests the zip files all had very similar 4.x GB sizes. The orbits are available (only the September and November dates for orbit 147) and I assume downloaded correctly. I can confirm more in a few days. I was also thinking to gdainfo them after extracting, for any insight. Apologies for my many edits here. I replied to your original response via email and then noted your second point about successful download. Thanks again.

[piyushrpt]

Is the error during parsing of the SLCs or the orbit files? Can you ensure that the orbits are available and are downloaded correctly.

[piyushrpt]

You will be able to get better error reporting with something like this

import isce
from isceobj.Sensor.TOPS.Sentinel1 import Sentinel1

reader = Sentinel1()
reader.configure()
reader.safe = ["{safe_zip_name}"]
reader.swathNumber = 3
reader.orbitDir = "{orbit_dir_name}"
reader.parse()