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, 2023, Vol. 20, No. 1, pp. 160-175

Mapping and analysis of desertification areas seasonal dynamics in the north of Dagestan based on Sentinel 2 monthly composites

A.B. Biarslanov 1 , S.S. Shinkarenko 2 , I.R. Gadzhiev 1 
1 Daghestan Federal Research Centre RAS, Makhachkala, Russia
2 Space Research Institute RAS, Moscow, Russia
Accepted: 19.01.2023
DOI: 10.21046/2070-7401-2023-20-1-160-175
The paper is devoted to mapping and analysis of the seasonal dynamics of desertification (open sands and blowout basins) of the Kizlyar pastures located in the northern part of the Republic of Dagestan. The research is based on the monthly Sentinel 2 composites of the second level of processing with filtered cloudiness and radiometric normalization for the period from 2019 to 2022. These data available in the Vega-Science system of the IKI-Monitoring Center for Collective Use were analyzed for the growing seasons, except for March 2021 and November 2022, when cloudless data on the territory were completely absent. Thus, we have obtained the data on the areas of open sands and blowout basins for 8–9 months of each year. To identify desertification, we used classification with training for one class, and the reference sample was formed on the basis of expert interpretation and ground data. It has been established that the area of desertification during the year can vary from two to ten times depending on pasture loads, hydrothermal conditions and wind regime. Most of the existing studies of the long-term dynamics of desertification do not take into account this seasonal aspect of changes in the areas of open sands and blowout basins, which can lead to incorrect conclusions. Availability of monthly cloudless composites of satellite data makes it possible to track the dynamics of both minimum and maximum desertification areas during the growing season. The results obtained can be used to optimize pasture loads and develop vegetative reclamation measures in the region.
Keywords: Dagestan, remote sensing, desertification, pastures, landscape degradation
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