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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, 2019, Vol. 16, No. 2, pp. 218-226

Reconstruction of surface wave kinematic characteristics and bathymetry from Geoton-L1 multichannel optical images from Resurs-P satellite

M.V. Yurovskaya 1, 2 , V.N. Kudryavtsev 2, 1 , S.V. Stanichny 1 
1 Marine Hydrophysical Institute RAS, Sevastopol, Russia
2 Russian State Hydrometeorological University, St. Petersburg, Russia
Accepted: 12.02.2019
DOI: 10.21046/2070-7401-2019-16-2-218-226
An approach to estimate the sea surface current and sea depth from a pair of optical satellite images of the sea surface obtained with a time delay comparable to the period of the observed waves, is considered. The method is based on analyzing the phase shift spectrum of the waves and estimating the Doppler shift in the dispersion relation. The method is applied to satellite multichannel optical images from Resurs-P (No. 1), where the time shift is provided by the bias in sensor view direction. Due to the lack of data on the exact time and/or view geometry, the algorithm is proposed for estimating the time lag from surface waves displacement. The algorithm is based on the assumption of current absence and implementation of the linear dispersion relation. The obtained value of the time lag was used to estimate bathymetry in the region of the Kerch Strait from the wave dispersion relation. As shown, for the reliable current velocity reconstruction, more accurate information about the time shift and sub-pixel inter-channel geolocation is needed. The possibility of estimating the speed and direction of objects on the sea surface (ships, breaking waves) from maximum of correlation function is demonstrated. The development of the proposed approach and the improvement of Geoton-L1 geolocation algorithms could serve to create a new tool for estimating the current velocity from space.
Keywords: satellite optical images, sequent images, Geoton-L1, Resurs-P, wave dispersion relation, currents, bathymetry, wave breaking
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