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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, 2022, Vol. 19, No. 4, pp. 141-149

Interactive map of active landslides and subsiding areas for the Central and Adler regions of the Big Sochi based on InSAR data for the period 2015–2021

E.I. Smolianinova 1 , V.O. Mikhailov 1 , P.N. Dmitriev 1 
1 Schmidt Institute of Physics of the Earth RAS, Moscow, Russia
Accepted: 25.07.2022
DOI: 10.21046/2070-7401-2022-19-4-141-149
We present an interactive map of surface deformations for the Central and Adler regions of the Big Sochi area based on the InSAR Sentinel-1A data from ascending 43A (167 images) and descending 123D (140 images) acquisitions for the period 2015–2021. SBAS ENVI SARScape v.5.3 software was used for processing. Methods of calculations and analysis of results are described in detail in 2019–2021. Evaluation version of the NextGIS QGIS software was incorporated for mapping. In the end of the InSAR processing displacements of the Earth’s surface and buildings in the satellite line of site direction (Ulos) were calculated and the mean displacement rates Vlos were mapped. The results are presented on the map as Vlos layers. Areas where absolute values of Vlos exceed 20 mm/Y are considered as Active Deformation Areas (ADA) and shown according to the direction of movements in red (from satellite) or blue (towards satellite). The most significant ADA are marked with numbers, and times series graphs of displacements for them are presented in popup windows. Brief interpretation of deformation character pictured in time series graphs can be found in Attributes tab. There is also a specific layer containing active landslide occurrences mapped in accordance with field data of FGBU Gidrospecgeologia. It was shown that InSAR and field data complement each other. This motivates joint usage of InSAR surface deformation maps together with landslides risk assessment maps based on field data. The presented visualization of InSAR data as an interactive map opens possibilities for complex use of InSAR data together with other GIS maps. In the Big Sochi area having high landslide risk and constant growing of man-made load, interactive maps based on InSAR and various field data make it possible to considerably improve the existing monitoring systems of landslides and areas of subsidence. The map is available at: https://adler.nextgis.com/resource/591/display?panel=info.

Keywords: SAR, InSAR, satellite monitoring, landslides, subsidence, interactive map, Sentinel-1A, Big Sochi
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