статья в журнале

Ru

Sovremennye Problemy Distantsionnogo Zondirovaniya Zemli iz Kosmosa

ISSN:20707401
eSSN:2411-0280

2019

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. © 2019 Space Research Institute of the Russian Academy of Sciences. All rights reserved.

ОПТИЧЕСКИЕ СПУТНИКОВЫЕ ИЗОБРАЖЕНИЯ, ПОСЛЕДОВАТЕЛЬНЫЕ СНИМКИ, "ГЕОТОН-Л1", "РЕСУРС-П", ДИСПЕРСИОННОЕ СООТНОШЕНИЕ ВОЛН, ТЕЧЕНИЯ, БАТИМЕТРИЯ, ОБРУШЕНИЯ ВОЛН, SATELLITE OPTICAL IMAGES, SEQUENT IMAGES, GEOTON-L1, RESURS-P, WAVE DISPERSION RELATION, CURRENTS, BATHYMETRY, WAVE BREAKING

2019-12-12 15:49:00