A Docker/Podman configuration for sen2cor

Sen2Cor processing chain information: https://elib.dlr.de/145360/1/Comparison_S2-L2A_core-and-user-product.pdf

Installation

Build this docker/podman image with:

docker build --file Dockerfile --tag sen2cor .

sen2cor settings (file L2A_GIPP.xml)

Directory (path given within docker container) to auto-downloaded DEM into:

<DEM_Directory>/data/sen2cor_dem</DEM_Directory>

See sen2cor manual:

The third supported format (New Feature in Sen2Cor 2.10) is the Copernicus DEM. Please refer to the following link for more information: Copernicus DEM - GISCO - Eurostat (europa.eu): https://ec.europa.eu/eurostat/web/gisco/geodata/reference-data/elevation/copernicus-dem ... For the new supported Copernicus DEM, for example at 90 m resolution, set in the L2A_GIPP.xml e.g.:

<DEM_Directory>dem/CopernicusDEM</DEM_Directory>
<DEM_Reference>
https://prism-dem-open.copernicus.eu/pd-desk-open-access/prismDownload/COP-DEM_GLO-90-DGED__2021_1/
</DEM_Reference>

Background info on Copernicus DEM service: https://sentinels.copernicus.eu/web/sentinel/-/copernicus-dem-new-direct-data-download-access

Usage

Show sen2cor help text:

docker run -it --rm sen2cor L2A_Process --help

For a brief example, you first need to download a Sentinel-2 level 1C granule in the SAFE format, and place this unzipped in e.g. the ${HOME}/s2_L1C/ directory.

Example:

• unpack the S2-SAFE scene in ${HOME}/s2_L1C/
• update as needed the L2A_GIPP.xml file to the directory in which docker/podman will be now started:

docker run -it --rm \
  --volume="$(pwd)/:/sen2cor_settings" --volume="${HOME}/s2_L1C/:/data/" sen2cor \
  L2A_Process --GIP_L2A /sen2cor_settings/L2A_GIPP.xml --resolution 10 \
  /data/S2A_MSIL1C_20210601T104021_N0300_R008_T32ULB_20210601T125922.SAFE

The resulting Sentinel-2 L2A scene (directory scene name changed to N9999) will be stored next to the L1C scene.

Notes by Alex Leith in original repo (https://github.com/frontiersi/docker-sen2cor-example)

• If the run fails with an error like [CRITICAL] L2A_Config: 3181 Error in creating L2A User Product then this may mean your granules don't have the AUX_DATA or HTML folders. The files I downloaded from CreoDIAS didn't have the AUX_DATA folders, so I created them, and it seems to work.