ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa


Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2020, Vol. 17, No. 7, pp. 19-25

A priori accuracy assessment methodology of the geometric alignment of multi-temporal multispectral images of the Earth’s surface

A.E. Kuznetsov 1 , P.N. Svetelkin 1 , V.I. Poshekhonov 1 
1 Ryazan State Radio Engineering University named after V.F. Utkin, Ryazan, Russia
Accepted: 05.11.2020
DOI: 10.21046/2070-7401-2020-17-7-19-25
A methodology for a priori accuracy assessment of the geometric alignment of multispectral images of the Earth’s surface, which are formed by high spatial resolution sensors, is considered. An image geolocation model that is used to obtain geometric match between images is presented. Sources that lead to geometric mismatches of images are investigated. It is shown that the cause of geometric mismatches when obtaining a color-synthesized image is different moments of image acquisition of the objects on the Earth’s surface. This leads to discrepancies between multispectral images caused by errors in measuring the spacecraft’s angular velocities and inaccuracies in digital elevation models used in image processing. Errors in measuring angular velocities are eliminated at the stage of interchannel image bundle adjustment, and errors in measuring heights — by choosing a digital elevation model of the required accuracy. Mathematical relations to estimate the magnitude of these mismatches are given, as well as a priori estimates of the alignment accuracy of multispectral images for pairs of images from the Resurs-P and Kanopus-V spacecrafts. The results of practical testing of the methodology for the Geoton equipment of Resurs-P satellites are considered. Based on the results of calculations, recommendations are given for the design of ground processing software which make it possible to compensate for the influence of distorting factors and ensure high-precision alignment of images with each other.
Keywords: high-resolution imaging equipment, multi-temporal multispectral images, coordinate misalignment of images, accuracy of geometric alignment
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