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# CES NeigeOA
# Let-it-snow operational snow cover product from Sentinel-2 and Landsat-8 data
## Synopsis
This code is a Python/OTB version of the demonstrator of the snow detection algorithm for Sentinel-2 images.
This code is a Python/OTB version of the demonstrator of the snow detection algorithm for Sentinel-2 and Landsat-8 images.
To read more about this product (in French):
The algorithm documentation with examples is available here:
* [Algorithm theoritical basis documentation](https://tully.ups-tlse.fr/grizonnet/let-it-snow/blob/master/doc/tex/ATBD_CES-Neige.pdf)
To read more about this project (in French):
* [Bulletin THEIA](https://www.theia-land.fr/sites/default/files/imce/BulletinTHEIA3_light.pdf#page=10)
* [Slides Séminaire GEOSUD](http://www.equipex-geosud.fr/documents/10180/233868/7_GascoinHagolle2015-THEIA+CES+surface+enneigee_S%C3%A9minaire+Theia+Geosud+2015.pdf)
The input files are SPOT or Landsat-8 Level-2A images from Theia Land and the SRTM digital elevation model.
The input files are SPOT-4/5, Sentinel-2 or Landsat-8 Level-2A images from Theia Land data center and the SRTM digital elevation model.
## Code Example
To build DEM data. Download VRT files corresponding to the data and build the .vrt using gdalbuildvrt. Edit config.json file to activate preprocessing : Set "preprocessing" to true and set vrt path. It will project and resample the SRTM DEM over the Landsat/SPOT area (30m:Landsat8 or 20m:Take5). It uses gdalwarp with the cubicspline option.
To build DEM data download the SRTM files corresponding to the study area and build the .vrt using gdalbuildvrt. Edit config.json file to activate preprocessing : Set "preprocessing" to true and set vrt path. It will project and resample the SRTM DEM over the Landsat/SPOT area (30m:Landsat8 or 20m:Take5).
The snow detection is performed in the Python script app/run_snow_detector.py.
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## Motivation
Code to generate CES Neige products on Theia platforms
Code to generate the snow cover extent product on Theia platform.
## Installation
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## Contributors
Manuel Grizonnet (CNES), Simon Gascoin (CNRS/CESBIO), Tristan Klempka (Stagiaire CNES)
Manuel Grizonnet (engineer at CNES), Simon Gascoin (researcher at CNRS/CESBIO), Tristan Klempka (intern at CNES)
## License
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