I have prepared four shaded relief images (hillshade) with four contrasting illumination directions 0°, 45°, 90° and 135°.I would like to combine four shaded relief images to produce one shaded relief iourmage with multi - illumination directions (0°,45°,90°,and 135°) for lineament analysis.How could I combine these four shaded relief images using GIS overlay technique in ARC Map 10.1? Kindly give me step-wise suggestions.
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