Frequently Asked Questions

Q: How can I fix “proj_create_from_database: ellipsoid not found” messages?

A: Just ignore the error. As far as we known, it has no incidence.

This message is produced by earlier versions of GDAL (used by OTB 7.4) on Sentinel-1 products with an “unnamed ellipsoid”. If you execute gdalinfo on these Sentinel-1 products you will also observe the error, independently of S1Tiling or OTB.

Example:

$> gdalinfo s1a-iw-grd-vv-20200108t044150-20200108t044215-030704-038506-001.tiff
ERROR 1: PROJ: proj_create_from_database: ellipsoid not found
proj_create_from_database: ellipsoid not found
Driver: GTiff/GeoTIFF
Files: s1a-iw-grd-vv-20200108t044150-20200108t044215-030704-038506-001.tiff
Size is 25345, 16817
GCP Projection =
GEOGCRS["WGS 84",
    DATUM["World Geodetic System 1984",
        ELLIPSOID["unnamed",6378137,298.25722356049,
...

It’s likely related to GDAL issue #2321, and tracked in S1Tiling issue #46.

Q: Why do I get a log error when running several jobs?

A: When running S1Tiling in several jobs that can be executed simultaneously, DO NOT execute S1Tiling in the same directory. Also, DO NOT use the same global directory to generate temporary files. Indeed, parallel instances of S1Tiling will write in the same files and corrupt them. Make sure to work in different spaces.

In other words,

execute S1Tiling from, for instance, ${PBS_O_WORKDIR}/${PBS_JOBID}, – indeed, unlike ${TMPDIR}/, ${PBS_O_WORKDIR}/${PBS_JOBID} will persist job execution on PBS.
and set [PATHS].tmp to ${TMPDIR}/whatever-${PBS_JOBID}.

This Q/A is tracked in S1Tiling issue #70.

Q: How can I overcome timeouts when searching for online products?

Some data providers like PEPS may fail to obtain in time the list of products matching our criteria.

Since EODAG v2.11.0, we can override the default timeout value thanks to:

the $EODAG__{PROVIDER}__SEARCH__TIMEOUT environment variable,
or the configuration option {provider}.search.timeout.

In case you have to cope with an earlier version of EODAG, you can still run S1Processor with --nb_max_search_retries.

Q: How can I configure precise orbit files retrieval?

EOF files will be downloaded either:

on Copernicus Dataspace. In that case, add your cop_dataspace credentials in eodag configuration file.
Note

If your account is configured for Two Factor Authentivcation (2FA), then you can either:
- set $EODAG__COP_DATASPACE__AUTH__CREDENTIALS__TOTP and quickly run LIA map production scenario while your One Time Password is still valid (< 30sec)
- request an access token with one of the methods described on Copernicus Dataspace web site, and use it in $EODAG__COP_DATASPACE__AUTH__TOKEN. It should be valid a bit more longer.
or on EarthData. In that case add your earthdata credentials in your ~/.netrc file (default location can be overriden with $NETRC). e.g.
```
machine urs.earthdata.nasa.gov
  login your.login
  password YoURpAssWoRd
```

If credentials are provided for both data providers, they will be interrogated in order: Copernicus Dataspace first, then EarthData if no connexion could be established to the former.

Q: How can I ask another question?

You can contact us and ask any question related to S1Tiling on S1Tiling discourse forum.

If you think your issue is a bug, please follow the procedure described in the contributing guide.