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Luong, C. K., Nguyen, V. H., Tran, N. T., Tran, T. T., & Le, T. H. N. (2012). Using digital elevation model to calibrate radi- ation spectrum image satellites SPOT5 for large terrain with different height . Journal of Geodesy and Cartography, (14), 8–15. https://doi.org/10.54491/jgac.2012.14.503
Abstract
In the terrain with high elevation differences, a fact that we often encounter the phenomenon obscured in the shade of the above objects, for those in low. This phenomenon affects the image spectral radiances. Specifically, the shadow region will be in deep black color tones, it is very difficult to distinguish the objects. That will lead to misclassify land cover. To conduct topographic correction effects in areas of high elevation difference, we use digital elevation model DEM. Thus, the DEM is not only used to rectify geometrical image but also learn to corret image radiances. Perfect orthomap requires at the same time geometrical and radiometric corrections, where radiometric correction should be carried out: sensor radiation correction; atmospheric effects, and terrain effects due to high elevation differences of terrain. The paper presents the use of DEM and choosen model for SPOT5 images spectral radiance corretion due to the undulant area.
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