Dunes and Inverted Craters in Arabia Terra
NASA/JPL/University of Arizona
Dunes and Inverted Craters in Arabia Terra
ESP_016459_1830  Science Theme: Aeolian Processes
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This image shows dark sand dunes and inverted craters in the Arabia Terra region of Mars.

The sand is dark because it was probably derived from basalt, a black volcanic rock that is common on Mars. Unlike traditional craters that are depressions, those here stick up above the surrounding plains. Such "inverted topography" is found on Mars and Earth where erosion has stripped away surrounding topography.

In this case, the craters were filled with sediment. Subsequent erosion stripped away the terrain around the filled craters, leaving the inverted topography visible here. The enlarged color view shows one of the inverted craters surrounded by the dark dunes.

Written by: Nathan Bridges   (3 March 2010)

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Acquisition date
29 January 2010

Local Mars time:
14:55

Latitude (centered)
3.120°

Longitude (East)
4.553°

Range to target site
272.2 km (170.1 miles)

Original image scale range
27.2 cm/pixel (with 1 x 1 binning) so objects ~82 cm across are resolved

Map projected scale
25 cm/pixel and North is up

Map projection
Equirectangular

Emission angle:
2.7°

Phase angle:
42.9°

Solar incidence angle
45°, with the Sun about 45° above the horizon

Solar longitude
44.7°, Northern Spring

North azimuth:
97°

Sub-solar azimuth:
27.0°
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RGB color
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IRB color
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JP2 EXTRAS
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non-map           (605MB)

IRB color
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non-map           (436MB)

Merged IRB
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Merged RGB
map-projected  (275MB)

RGB color
non map           (455MB)
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.