a
b
c
d
Fig. 30. Contours of glaciers No. 404 − 409: a − according to the topographic map, b − according to the Landsat 7 ETM+ sensor image of August 11, 2011, c − according to the Landsat 8 OLI sensor image of August 28, 2014, d − according to the Landsat 8 OLI TIRS sensor image of September 4, 2020.
