a
b
c
d
Fig. 5. Contours of glacier No. 340: a ā according to the topographic map, b ā according to the Landsat 5 TM sensor image of September 19, 2011, cā according to the Landsat 8 OLI TIRS sensor image of September 12, 2017, d ā according to the Landsat 8 OLI TIRS sensor image of September 11, 2020.
