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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, 2021, Vol. 18, No. 6, pp. 177-184

Study of the tortuosity of thermokarst lake coastlines in the eastern Russian Arctic using Kanopus-V high-resolution images

Yu.M. Polishchuk 1 , I.N. Muratov 1 , O.A. Baisalyamova 1 , P.A. Nabiullina 1 
1 Ugra Research Institute of Information Technologies, Khanty-Mansiysk, Russia
Accepted: 14.10.2021
DOI: 10.21046/2070-7401-2021-18-6-177-184
The article is devoted to the issues of remote sensing of the tortuosity properties of thermokarst lake coastlines in four Arctic territories, which are relatively homogeneous areas in terms of properties, hereinafter called ecoregions. For the research, 31 test sites of approximately equal area were selected in different ecoregions located in Yakutia, Chukotka and Kamchatka. At each test site, using the Kanopus-V images, from hundreds to several thousand lakes with a minimum area of 40 m2 were determined. On the basis of measurements of areas and perimeters of the lakes in each ecoregion, histograms of the lake coastlines tortuosity degree distribution were constructed, showing a similar character in different territories. It is shown that the tortuosity degree of lake coastlines varies in a fairly wide interval of values from one to several tens, although the range of changes in their average values in all ecoregions is relatively small and ranges from 3 to 5. The dependence of the tortuosity degree on the lake size has been studied. It was found that this value, on average, shows a positive trend with an increase in the area of the lakes from 50 to 10,000 m2, and for large lakes it fluctuates within small limits. The results obtained can be taken into account when estimating the errors in measuring the lake areas in the investigated territories using the Kanopus-V satellite images.
Keywords: permafrost, space images, arctic tundra, thermokarst lakes, tortuosity of lake coastlines, histograms of the lake coastlines tortuosity degree distribution, ecoregions
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