Gangotri is one of the major Himalayan glaciers which has been subjected to dominant retreat since 1850 AD.16 The retreat of Gangotri glacier has a huge impact on the flow of Ganges, the largest perennial river in India. Coherence images were generated over Gangotri glacier from SAR images with different repeat periods from 1996 (ERS-1 & 2), 2004 (Envisat) & 2012 (TerraSAR-X) and are resampled to 50x50 m grid using SRTM DEM. Profiles near the snout position were precisely marked in a GIS environment and the distance between the profiles (1996, 2004, 2012) is reported as retreat. It has been observed that the Gangotri glacier has been retreating at the rate of 24+/- 1 m per year which is in good agreement with several other studies.
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Bhuvan K. Varugu, Yalamanchili S. Rao, "Glacier retreat monitoring from SAR coherence images: application to Gangotri glacier," Proc. SPIE 9877, Land Surface and Cryosphere Remote Sensing III, 987715 (5 May 2016);