Metoda przetwarzania mikrofalowych zdjęć satelitarnych terenów o urozmaiconej rzeźbie z wykorzystaniem numerycznego modelu terenu

W pracy przedstawiono metodę usuwania zniekształceń geometrycznych i radiometrycznych występujących w obrazach mikrofalowych SAR odnoszących się do obszarów o urozmaiconej rzeźbie. Podstawowym źródłem informacji wykorzystywanym w tym procesie jest numeryczny model terenu. Zastosowanie korekcji geometrycznej i radiometrycznej do obrazów mikrofalowych Gór Izerskich umożliwiło przeprowadzenie ich klasyfikacji tematycznej.

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The method of removing geometrie and radiometrie distortions, which appear in SAR microwave images covering terrain with varied relief, was presented in the article. Those basie rules of capturing and creating microwave images were discussed, which have direct impact on interpretation of images covering terrain with varied relief. In order to analyse SAR images correctly, data about shape and location of surface, which scatters radar signal, are needed. These data can be derived from the digital terrain model. Problem of transformation of digital terrain model to the global reference system, in which all calculations needed for image georeferencing are performed, was described in the article. In order to determine geometrical relations between satellite and scanned fragments of EaruYs surface, data on location and speed of satellite during scanning are also needed. The method of approximation of satellite movement on the orbit and algorithm for determining proper spatial relations were presented. Radiometrie correction has been widely discussed, as new method of determining correction coefficient had to be proposed. The method , which enables to generate additional information layers, useful for interpretation of radar images, was also described. Use of the method results in generating data conceming angle of incidence of radar beam onto Earth's surface and in pointing those parts of images, which cannot be properly corrected and hence they are not suitable for thematic interpretation. The prepared method was tested using images of Izerskie Mountains. i Thematic classification of these images was done after making the necessary corrections; it confirms possibility of.