Dunes on Ridges
NASA/JPL/University of Arizona
Dunes on Ridges
ESP_025625_1580  Science Theme: Aeolian Processes
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Check out the stereo anaglyph of this scene. It shows dark sand dunes marching over the ridges created by an alluvial (water-deposited) fan in an impact crater. The subimage shows a small piece at full resolution.

These dunes may be active today, but we haven't yet observed them at significantly different times to measure the movement. The dunes are moving from northwest (upper left) to southeast, with the steep slope facing downwind.

Written by: Alfred McEwen  (29 February 2012)

This is a stereo pair with ESP_024913_1580.
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Acquisition date
14 January 2012

Local Mars time:
14:50

Latitude (centered)
-21.603°

Longitude (East)
320.382°

Range to target site
300.7 km (188.0 miles)

Original image scale range
30.1 cm/pixel (with 1 x 1 binning) so objects ~90 cm across are resolved

Map projected scale
25 cm/pixel and North is up

Map projection
Equirectangular

Emission angle:
31.4°

Phase angle:
82.3°

Solar incidence angle
59°, with the Sun about 31° above the horizon

Solar longitude
56.7°, Northern Spring

For non-map projected images
North azimuth:  94°
Sub-solar azimuth:  51.3°
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   (1705MB)

IRB color
map-projected   (1062MB)

JP2 EXTRAS
Black and white
map-projected  (842MB)
non-map           (717MB)

IRB color
map projected  (348MB)
non-map           (573MB)

Merged IRB
map projected  (455MB)

Merged RGB
map-projected  (438MB)

RGB color
non map           (580MB)
ANAGLYPHS
Map-projected, reduced-resolution
Full resolution JP2 download
Anaglyph details page

DIGITAL TERRAIN MODEL (DTM)
DTM 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
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. The HiRISE camera was built by Ball Aerospace and Technology Corporation and is operated by the University of Arizona.