a
b
c
d
Fig. 31. Contours of glaciers No. 236 (Becho) − 240: a − According to the topographic map, b − According to the Landsat 7 ETM+ sensor image of August 31, 2010, c − According to the Landsat 8 OLI TIRS sensor image of September 5, 2015, d − According to the Landsat 8 OLI TIRS sensor image of September 11, 2020.
