Topography and surface Features of Mars—Summary*


  • Alan B. Binder


Radar ranging data taken along the +21.5° parallel of Mars have shown conclusively that elevation differences of up to 11 km occur on the planet. The highest areas observed are desert regions; the maria lie in low areas or on slopes. The canals identified in the radar data all occur in broad and frequently deep valleys which are related to a planet-wide lineament system. It was found that the topographic contours based on the radar data readily fit the visual surface features even in the areas where the features are very complex.