We seek to understand and correct shading artifacts caused by varying solar illumination conditions and different viewing angles in remotely sensed images. A synthetic image simulating the shading effects for the sun angle and viewing angle as a real image, is generated using a terrain reflectance model and digital elevation data. A good correlation is obtained between the real and synthetic images. The artifact correction is then made, and a resulting image shows useful information that is not apparent in the original image.
We also present a three-dimensional perspective representation of a terrain with a corresponding aerial photograph mapped on it, which incidentally may help image interpretation.
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