New covariate: Winter severity

The winter severity raster data set, calculated as % of the time that a cell is covered by snow from 1 October to 31 march next year is now in the EURODEER database. It is  based on MODIS Snow (500 meters resolution). It is calculated using the PostGIS function ST_UNION per tile and per year over the whole MODIS Snow time series. This new time series is available in the table env_data_ts.winter_severity. The code is accessible at GITHUB EURODEER. It can also be used as a starting point for other functions that aggregate time series according to specific criteria. On request, it can be also made available as a set of .tif images (one per winter, or as long term average).

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