In order to test the full potential of the computer‐enhanced image of original Landsat Thematic Mapper data the semi‐arid area of the Gregory Rift Valley (Kenya) was selected. The aim is to estimate the capability of false partially colour composite in bands 1, 3 and 4 to discriminate among metamorphic and various volcanic rock types. Furthermore signal reflectance differences among rocks of various ages but equal chemical characteristics were evaluated. Field surveys of the authors and published geological data made it possible to gather a great amount of ground truth. Comparison of satellite image interpretation and field geological data has demonstrated the validity of this T.M. image enhancement in lithotype discrimination but also has led to better definition of the spatial distribution of the various rock types in the area.
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Tibaldi et al. (1988) studied this question.
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