These maps show the total number of days with snow on the ground during the hydrological year up to 20 m resolution. Each map was computed by temporal interpolation of Landsat-8 and Sentinel-2 snow products available from Theia (http://theia.cnes.fr). Pixels with values below 60 days were masked out to remove potential artefacts in low elevation areas due to snow/cloud confusions. Note that the snow detection from optical sensors like Sentinel-2 and Landsat-8 is not reliable in dense forest areas.
We do our best to ensure that the data are accurate, however, these snow persistence maps are provided "as is," without warranty of any kind, either express or implied, including, but not limited to, the implied warranties of merchantability, fitness for a particular purpose, noninterference, system integration, or noninfringement.
Gascoin, S., Grizonnet, M., Bouchet, M., Salgues, G., and Hagolle, O.: Theia Snow collection: high resolution operational snow cover maps from Sentinel-2 and Landsat-8 data, Earth Syst. Sci. Data Discuss., https://doi.org/10.5194/essd-2018-144, in review, 2018.
Simon Gascoin (CESBIO/CNRS), Manuel Grizonnet (CNES), Germain Salgues (Magellium).
This work was supported by the CNES. Sentinel-2 and Landsat-8 imagery are provided by Copernicus (Sentinel-2) and the USGS (Landsat-8).