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ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa
CURRENT PROBLEMS IN REMOTE SENSING OF THE EARTH FROM SPACE

  

Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2025, V. 22, No. 4, pp. 269-275

Assessment of glacier surface deformation in the Pskem River basin using Sentinel-1A data

E.R. Semakova 1 , M.G. Potorjinskiy 1 
1 Ulugh Beg Astronomical Institute of the Uzbekistan Academy of Sciences, Tashkent, Uzbekistan
Accepted: 07.05.2025
DOI: 10.21046/2070-7401-2025-22-4-269-275
Remote sensing techniques are an effective way to monitor changes in the state of glaciers located in hard-to-reach high mountain areas. An analysis of surface elevation changes was carried out throughout Sentinel-1 acquisitions for three glaciers in the Pskem River basin, Western Tien-Shan, where glaciological expeditionary observations are held (Barkrak Sredniy, Pakhtakor, Tekeshsay glaciers). The DInSAR (Differential Interferometry Synthetic Aperture Radar) and SBAS (Small BAseline Subset) methods were used. Processing of individual pairs of SAR images by the DInSAR method was carried out by the SNAP (SeNtinel Application Platform) software. The SBAS method used ASF DAAC HyP3 (Alaska Satellite Facility, Distributed Active Archive Center, Hybrid Pluggable Processing Pipeline) 2024 interferometric processing products. The glacier surface deformation was calculated from August 2021 to August 2024 with a 12-day acquisition interval and from 2015 to 2024 with a 1-year interval. For each interference pair, the deformation was corrected considering the GACOS (Generic Atmospheric Correction Online Service) atmospheric correction and normalized to a single reference point with the maximum coherence value of the entire sample of images. These procedures allowed us to obtain the most reliable results on cumulative deformation. Twelve-day alternations of glacier subsidence and uplift in summer depend on the accompanying meteorological conditions, glacier creep and topography of the subglacial bed. The yearly acquisitions allowed us to compare the measured deformation of the glacier surface with ground-based observations.
Keywords: Sentinel-1 data, glaciers, Uzbekistan mountains, SBAS, surface deformation, Pskem River basin
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