a
b
c
d
Fig. 29. Contours of glaciers No. 226 (Tsalgmila), No. 227 (Lakra) and No. 228: a − according to the topographic map, b − according to the image of the Landsat 7 ETM+ sensor of August 31, 2010, c − according to the image of the Landsat 8 OLI TIRS sensor of September 5, 2015, d − according to the image of the Landsat 8 OLI TIRS sensor of September 11, 2020.
