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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, 2017, Vol. 14, No. 7, pp. 210-224

Calculation of compacting sea ice cover by satellite images

A.I. Aleksanin 1, 2 , M.G. Aleksanina 1, 2 , A.Yu. Karnatsky 1 
1 Institute of Automation and Control Processes FEB RAS, Vladivostok, Russia
2 Far Eastern Federal University, Vladivostok, Russia
Accepted: 25.09.2017
DOI: 10.21046/2070-7401-2017-14-7-210-224
This paper describes a new method of automatic calculation of local indices of compacting and divergence of sea ice cover. The proposed approach is based on the calculation of ice drift velocities that are regarded as the velocities of marker displacements, determined using a sequence of images from meteorological satellites. The local index of compacting and divergence of sea ice cover is considered as the rate of change in the distance between individual elements of the sea ice cover. An approach to calculating the local indices of compacting and divergence is proposed. The local index of compacting and divergence is determined by two parameters: the scalar value of compacting/divergence and the direction of the axis of compacting/divergence. This approach allows estimation of the accuracy and statistical significance of the calculated parameters. The results of the proposed approach are presented on the example of ice cover of the Sea of Okhotsk in April 2010 near the port of Magadan. Velocities of the ice field drift were calculated using pairs of the MODIS radiometer satellite images with a spatial resolution of 250 m and a time interval of 24 h. It was shown that the proposed approach results correspond to visually observed parameters of compacting and divergence. A significant variation was marked between local estimates of compacting/divergence received for different sizes of the areas where ice cover drift was analyzed.
Keywords: satellite images, marker movement velocity, ice drift, ice compacting index, direction of ice compacting axis
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