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 up

Map 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

North azimuth:
97°

Sub-solar azimuth:
28.8°
JPEG
Black and white
map projected  non-map

IRB color
map projected  non-map

Merged IRB
map projected

Merged RGB
map projected

RGB color
non-map projected

JP2
Black and white
map-projected   (1449MB)

IRB color
map-projected   (635MB)

JP2 EXTRAS
Black and white
map-projected  (762MB)
non-map           (699MB)

IRB color
map projected  (203MB)
non-map           (561MB)

Merged IRB
map projected  (337MB)

Merged RGB
map-projected  (324MB)

RGB color
non map           (548MB)
ANAGLYPHS
Map-projected, reduced-resolution
Full resolution JP2 download
Anaglyph details page

ADDITIONAL INFORMATION
B&W label
Color label
Merged IRB label
Merged RGB label
EDR products
HiView

NB
IRB: infrared-red-blue
RGB: red-green-blue
About color products (PDF)

Black & white is 5 km across; enhanced color about 1 km
For scale, use JPEG/JP2 black & white map-projected images

USAGE POLICY
All of the images produced by HiRISE and accessible on this site are within the public domain: there are no restrictions on their usage by anyone in the public, including news or science organizations. We do ask for a credit line where possible:
NASA/JPL/University of Arizona



Postscript
For information about NASA and agency programs on the Web, visit: http://www.nasa.gov. NASA's Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, Calif., manages the Mars Reconnaissance Orbiter for NASA's Science Mission Directorate, Washington. Lockheed Martin Space Systems is the prime contractor for the project and built the spacecraft. The HiRISE camera was built by Ball Aerospace and Technology Corporation and is operated by the University of Arizona. The image data were processed using the U.S. Geological Survey’s ISIS3 software.