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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, 2024, Vol. 21, No. 1, pp. 51-65

Study of the applicability of C-band geophysical model functions for SAR data in conditions of the Gorky Reservoir

N.S. Rusakov 1 , D.A. Sergeev 1 , O.S. Ermakova 1 , A.M. Kuznetsova 1 , D.S. Gladskikh 1 , E.I. Poplavsky 1 
1 Institute of Applied Physics RAS, Nizhny Novgorod, Russia
Accepted: 23.11.2023
DOI: 10.21046/2070-7401-2024-21-1-51-65
The study is concerned with the investigation of the applicability of the C-band geophysical model functions (GMF) CMOD5, CMOD5.N, CMOD7 in the conditions of an inland reservoir (using the example of the Gorky Reservoir). The proposed GMFs were used to calculate wind speed from SAR image data from the Sentinel-1 satellite for the IW mode and co-polarization. The wind speed direction values required for calculations within the framework of the selected GMF were obtained from weather station measurements installed in the southern part of the Gorky Reservoir. At the same time, the weather station data were combined with selected SAR images in time and space. It was found that the best result is provided by the CMOD5.N model. Additionally, wind speed calculations were carried out within the framework of a geophysical model function for inland water bodies developed on the basis of the SSA2 small slope approximation and combined model spectra. It was found that this GMF reproduces wind speed with less accuracy compared to CMOD models. It was also demonstrated that for the conditions of the Gorky Reservoir, the results of CMOD calculations are in satisfactory agreement with the predictions of spatial distribution of wind speed field calculated using the Weather Research and Forecasting (WRF) model.
Keywords: Sentinel-1 satellite, inland waters, SAR image, C-band, geophysical model function, oceanographic buoy
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