a
b
c
d
Fig. 39. Contours of glaciers No. 270 - 274: 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 7, 2015, d − according to the Landsat 8 OLI TIRS sensor image of September 11, 2020.
