Dear forum users, developers,
I have a question regarding the correct format and location for S1 orbit files downloaded from ESA FTP (aux.sentinel1.eo.esa.int).
When processing S1 data (using SNAP5) I am getting the error messages (for both POEORB and RESORB):
WARNING: org.esa.s1tbx.sar.gpf.orbits.ApplyOrbitFileOp: No valid orbit file found for 06-OCT-2018 16:49:47.889909 │
Orbit files may be downloaded from https://qc.sentinel1.eo.esa.int/ │
and placed in /home/gisat/.snap/auxdata/Orbits/Sentinel-1/POEORB/S1A/2018/10
The hint in the error message indicates that the orbit files can be downloaded in advance and placed in the SNAP folder. On the FTP however the folder structure and orbit files format seem to be a bit different than the files downloaded by SNAP:
- on the FTP there are no separate folders for S1A and S1B, in the SNAP home folder there are two folders created (S1A, S1B)
- moreover on the FTP the orbit files are stored to months and days folders, which is not the case for SNAP home folder where all files are placed directly to month folder e.g. /.snap/auxdata/Orbits/Sentinel-1/RESORB/S1A/2018/10/
- the orbit files on FTP are not compressed, but SNAP downloads them as ZIP archives
So my question is what shall be the approach for storing the orbit files so they can be correctly read by SNAP, which, I believe, can fasten the processing.
Thank you in advance.
Ondrej