Polygonal Ridges
NASA/JPL/University of Arizona
Polygonal Ridges
ESP_017348_1910  Science Theme: Aeolian Processes
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This image from the Gordii Dorsum region of Mars shows a large area covered with polygonal ridges in an almost geometric pattern.

The ridges may have originally been dunes which hardened (indurated) through the action of an unknown process. Groundwater might have been involved.

Written by: Nicolas Thomas   (26 May 2010)

This is a stereo pair with ESP_018548_1910.

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Acquisition date:09 April 2010 Local Mars time:15:09
Latitude (centered):10.784° Longitude (East):212.173°
Range to target site:278.3 km (174.0 miles)Original image scale range:27.8 cm/pixel (with 1 x 1 binning) so objects ~84 cm across are resolved
Map projected scale:25 cm/pixel and North is upMap projection:Equirectangular
Emission angle:3.4° Phase angle:49.7°
Solar incidence angle:47°, with the Sun about 43° above the horizon Solar longitude:75.1°, Northern Spring

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