!Readme Classification of land cover for Selenga Basin -Buryat Republic, Russia and Mongolia, 1990, 2020. Image classifications were performed in the Google Earth Engine environment. Pixel-based image composites were produced with Landsat 4,5 for the period I (1988-1991) and ESA Copernicus Sentinel-2 for period II (2019-2020). Original bands were complemented with simple seasonality metrics (e.g., minimum, maximum, standard deviation) calculated across phenology periods (from April to October). Training and validation data were collected during the field trip, interpretation of very-high-resolution imagery and dense optical Landsat and Sentinel-2. Selenga_basin_1990_cl_v1.3.tif-image classification for Buryat (Russia) and Mongolian part of Selenga basin circa 1990 Selenga_basin_2020_cl_v1.3.tif-image classification for Buryat (Russia) and Mongolian part of Selenga basin circa 2020 Classification catalog 1-Forest 2-Cropland 3-Grassland 4-Impervious, bare 5-Water For more details, please consult Alexander Prishchepov alpr@ign.ku.dk, prialign@gmail.com