a
b
c
d
Fig. 4. Contours of glaciers No. 145 (Okrylastavi, 146a), No. 146 (Okrylastavi, 146b) − 148 (Memula): 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.
