Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2021, Vol. 18, No. 4, pp. 79-91
The seasonal changes investigation of Vize Island surface for the mapping purposes using a multi-temporal coherence composite (MTC)
V.Yu. Shirshova
1, 2 , E.A. Baldina
1 1 Lomonosov Moscow State University, Moscow, Russia
2 Research Center for Earth Operative Monitoring, Moscow, Russia
Accepted: 16.06.2021
DOI: 10.21046/2070-7401-2021-18-4-79-91
Radar interferometry methods are widely used to create and update digital elevation maps and to study the movements of the Earth’s surface. However, radar interferometry can also be used in many other applications, in particular for monitoring seasonal variability of hard-to-reach areas. Small Arctic islands are “white spots” on maps, due to the fact that since the 1950s the cartographic information on them has not been updated, and its updating with the use of ground measurements or images in the optical range is very labor- and resource-intensive. Meanwhile, in the conditions of global climate change, such islands are the most susceptible to transformations. Small Arctic islands can therefore serve as markers of warming processes, for which it is necessary to designate indicators for monitoring environmental changes. The presented work demonstrates the application of interferometric coherence to study seasonal variability. The multitemporal coherence composite (MTC), widely used as a change indicator for agricultural areas, was applied to assess changes in Arctic Vise Island. With the help of the multitemporal composite, the characteristic features of seasonal surface variability at different times of the year were determined on the example of Vise Island. For this purpose, all available interferometric radar data from Sentinel-1 satellite on the territory of the island were processed. Vise (a total of 88 images). A detailed analysis of the MTC composites was performed for 2019, the year for which the largest number of coherence maps was obtained, which was 26. We obtained data on the periods of ice-free water area closest to the island and snow-free surface over the past five years, provided by Sentinel-1 surveys. The conducted study will serve as a basis for creating thematic maps for the territory of Vise Island in the future.
Keywords: satellite radar interferometry, Sentinel 1, coherence, MTC composite, Arctic
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