a
b
c
d
Fig. 49. Contours of Glacier No. 325: a − according to the topographic map, b − according to the Landsat 5 TM sensor image of August 23, 2010, 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.
