Differential insolation component in Landsat digital data utilizing Fourier transform techniques.
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Differential insolation is the varying intensity of solar radiation falling upon a landscape as a function of terrain geometry with respect to the sun's angle and its azimuth. It forms a component in Landsat spectral responses and in this study it is analysed for a mountainous area using Fourier transform techniques. It is argued that definite benefits can be gained by isolating and eliminating this component but it is concluded that there still remain many unanswered questions relating to differential insolation. In particular the relation between the differential insolation component and the spectral component needs to be identified. -R.H.Johnson
