a
b
c
d
Fig. 8. Contours of glaciers No. 66 − 69: a – according to the topographic map, b – according to the Landsat 5 TM sensor image of September 21, 2011, c – according to the Landsat 8 OLI TIRS sensor image of September 5, 2017, d – according to the Landsat 8 OLI TIRS sensor image of September 13, 2020.
