a
b
c
d
Fig. 2. Contours of Glacier No. 336: a − according to the topographic map, b − according to the Landsat 5 TM sensor image of September 19, 2011, c − according to the Landsat 8 OLI TIRS sensor image of September 12, 2017, d − according to the Landsat 8 OLI TIRS sensor image of September 11, 2020.
