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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. 1, pp. 39-49

Satellite-derived bathymetry in the coastal zone of the Black Sea from remote sensing reflectance

S.V. Fedorov 1 , S.V. Stanichny 1 
1 Marine Hydrophysical Institute RAS, Sevastopol, Russia
Accepted: 13.12.2021
DOI: 10.21046/2070-7401-2022-19-1-39-49
The work is devoted to demonstrating the possibility of retrieving bathymetry in the coastal zone of the Black Sea from satellite measurements in the optical range of the electromagnetic spectrum. The method for the retrieval of satellite-derived bathymetry based on remote sensing reflectance is used. In optically shallow water, solar radiation reaches the bottom and is reflected back to the surface. Thus, remote sensing reflectance contains information about the depth and bottom substrate type, which makes it possible to solve the inverse problem of depth retrieval. Remote sensing reflectance was determined from Sentinel-2 MSI images. Atmospheric correction was performed in the ACOLITE software. The method of depth assessment consisted in calculating an index characteristic (pseudo-depth) equal to the ratio of the logarithms of remote sensing reflectance in two spectral bands with different absorption of solar radiation. Conversion of the obtained index into depths was carried out on the basis of a linear relationship with coefficients calibrated according to navigation maps. This method allows reconstructing bathymetry with a spatial resolution equal to pixel size of a satellite image. It helped to detect small inhomogeneities of the bottom relief in the coastal zone of Bakalskaya Spit. The applicability of this method depends on water transparency and does not exceed a depth of 20 m.
Keywords: satellite-derived bathymetry, Sentinel-2, Black Sea, Kazachya Bay, Bakalskaya Spit
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