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Surface roughness of nine radar backscatter units in the Askja Caldera region of Iceland was examined in computer‐enhanced like‐ and cross‐polarized radar images. A field survey of the caldera was then used to check the accuracy of the preliminary analysis. There was good agreement between predicted surface roughness of backscatter units and surface roughness observed in the field. In some cases, variations could be correlated with previously mapped geologic units.
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Malin et al. (1978) studied this question.
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