Topography of Moving Dunes in Nili Patera
NASA/JPL/University of Arizona

Topography of Moving Dunes in Nili Patera
ESP_017762_1890  Science Theme: 
DeutschPortuguêsItalianoGreekArabic


AUDIO

Listen to the text  


HISLIDES

PowerPoint  
Keynote  
PDF  
Many HiRISE targets are imaged twice, close together in time, with each image having a different viewing angle. From this, we are able to make digital elevation models (DEMs) with precisions of tens of centimeters. Doing this for dunes can be particularly challenging, as they commonly migrate.

However, if the images are close enough together in time, or are inactive, a good model can be made. This is the case here, where an elevation model was produced of the Nili Patera dune field.

These dunes are active and, by computing the height of the moving dunes using this DEM, researchers have determined the sand flux (sand volume per length per time) and find that it is similar to that seen for dunes in Antarctica.

The research also finds that the dunes are moving as coherent masses of mobile sand. This work has important implications, as it shows that wind processes on Mars can transport considerable volumes of sand, which not only contributes to dune migration, but also abrasion (sand blasting) of the surface.

Written by: Nathan Bridges   (7 November 2012)

This is a stereo pair with ESP_018039_1890.



 Image Products: All image links are drag & drop for HiView, or click to download
JPEG
Grayscale: map projected  non-map
IRB color: map projected  non-map
Merged IRB: map projected
Merged RGB: map projected
RGB color: non-map projected

JP2 DOWNLOAD
Grayscale: map-projected (1245.7 MB)
IRB color: map-projected (535.9 MB)

JP2 EXTRAS
Grayscale: map-projected  (558.5 MB),
non-map  (561.1 MB)
IRB color: map projected  (203.5 MB)
non-map  (387.9 MB)
Merged IRB: map projected  (333.2 MB)
Merged RGB: map-projected  (318.7 MB)
RGB color: non map-projected  (393.8 MB)

ANAGLYPHS
Map-projected reduced-resolution (PNG)
Full resolution JP2 download
View anaglyph details page

DIGITAL TERRAIN MODEL (DTM)
DTM details page

ADDITIONAL IMAGE INFORMATION
Grayscale label   Color label
Merged IRB label   Merged RGB label
EDR products

About color products (PDF)
HiView main page

 Observation Toolbox
Acquisition date:11 May 2010 Local Mars time: 3:06 PM
Latitude (centered):8.779° Longitude (East):67.321°
Range to target site:302.5 km (189.1 miles)Original image scale range:30.3 cm/pixel (with 1 x 1 binning) so objects ~91 cm across are resolved
Map projected scale:25 cm/pixel and North is upMap projection:Equirectangular
Emission angle:27.4° Phase angle:71.2°
Solar incidence angle:47°, with the Sun about 43° above the horizon Solar longitude:89.3°, Northern Spring
For non-map projected products:
North azimuth:96° Sub-solar azimuth:35.3°
For map-projected products
North azimuth:270°Sub solar azimuth:206.1°

Context map

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: Image: 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.