Reports

Mars: Correlation of Optical and Radar Observations

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Science  11 Apr 1969:
Vol. 164, Issue 3876, pp. 176-177
DOI: 10.1126/science.164.3876.176

Abstract

A comparsion of recent photographic and radar data on Mars indicates a good positive correlation between dark areas and radar reflection peaks and also between cloudy "desert" areas and radar minima. The data may be taken as evidence that dark areas are, in general, relatively smooth whereas deserts are relatively rough.