a
b
c
d
Fig. 4. Contours of glaciers No. 25 − 30: a − on a topographic map, b − according to the image of the Landsat 7 ETM+ sensor on August 31, 2010, c − according to the image of the Landsat 8 OLI sensor on September 5, 2015, d − according to the image of the Landsat 8 OLI TIRS sensor on September 11, 2020.
