Squiggly Sand Dunes
NASA/JPL/UArizona
Squiggly Sand Dunes
ESP_034801_1300  Science Theme: Mass Wasting Processes
It is now late northern spring on Mars, so the Southern middle latitudes get very low-sun illumination that accentuates subtle topography.

This image shows sand dunes mixed with rock outcrops on the floor of a large crater. Some of the dunes have squiggly crests, which is unusual. It looks like this is due to the outcrops, which anchor the dune in places as they migrate.

Written by: Alfred McEwen (narration: Tre Gibbs)  (5 February 2014)
 
Acquisition date
29 December 2013

Local Mars time
15:19

Latitude (centered)
-49.734°

Longitude (East)
11.365°

Spacecraft altitude
251.8 km (156.5 miles)

Original image scale range
50.7 cm/pixel (with 2 x 2 binning) so objects ~152 cm across are resolved

Map projected scale
50 cm/pixel and North is up

Map projection
Equirectangular

Emission angle
6.0°

Phase angle
89.4°

Solar incidence angle
85°, with the Sun about 5° above the horizon

Solar longitude
69.0°, Northern Spring

For non-map projected images
North azimuth:  96°
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   (296MB)

IRB color
map-projected   (173MB)

JP2 EXTRAS
Black and white
map-projected  (155MB)
non-map           (164MB)

IRB color
map projected  (55MB)
non-map           (138MB)

Merged IRB
map projected  (264MB)

Merged RGB
map-projected  (252MB)

RGB color
non map           (141MB)
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.