a
b
c
d
Fig. 2. Contours of glaciers No. 18 (Chegal) − 20: a − on a topographic map, b − according to the Landsat 7 ETM+ sensor image of August 31, 2010, c − according to the Landsat 8 OLI sensor image of September 5, 2015, d − according to the Landsat 8 OLI TIRS sensor image of September 11, 2020.
