Liang Yu

@hfattahi as mentioned you [here](https://github.com/opera-adt/COMPASS/pull/29#issuecomment-1142578121), this [module](https://github.com/scottstanie/sentineleof) looks like it'll do exactly what we need. Besides adding the module to the [environment yaml](https://github.com/opera-adt/s1-reader/blob/main/environment.yaml), should the ability to download if one...

#46 partially addresses this issue. `s1_reader.load_bursts` [lacks any checks](https://github.com/opera-adt/s1-reader/blob/c408ff3ecd8508d39339f7edd0cb06e7f75322fc/src/s1reader/s1_reader.py#L471) for `orbit_path`. `orbit_path` is blindly passed forward regardless of SAFE type. If an `os.path.isfile(orbit_path)` is added before bursts are loaded, `FileNotFoundError`...

> Thank you @LiangJYu , It looks good. I gave it a try and for one case I got the following error message from our isce3 orbit constructor: > >...