Sinuous Ridges and Meanders
NASA/JPL/University of Arizona
Sinuous Ridges and Meanders
ESP_034189_1740  Science Theme: Fluvial Processes
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These ridges are thought to be old river channels, but wind erosion has created inverted topography. What was low (the channel bottoms) was more resistant to erosion, so now it is relatively high.

In a closeup image, we see a cutoff meander. This forms as a river cuts its outer bank and curves more and more, until it decides to take a “short-cut.” The abandoned channel may have formed an oxbow lake, when water was present. This type of river system forms slowly over time, unlike the catastrophic flood channels seen elsewhere on Mars.

Be sure to look at the stereo anaglyph with red-green glasses at full resolution.

Written by: Alfred McEwen   (29 January 2014)

This is a stereo pair with ESP_034044_1740.

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Acquisition date
11 November 2013

Local Mars time:
14:50

Latitude (centered)
-6.041°

Longitude (East)
153.636°

Range to target site
284.4 km (177.7 miles)

Original image scale range
56.9 cm/pixel (with 2 x 2 binning) so objects ~171 cm across are resolved

Map projected scale
50 cm/pixel and North is up

Map projection
Equirectangular

Emission angle:
20.8°

Phase angle:
66.0°

Solar incidence angle
49°, with the Sun about 41° above the horizon

Solar longitude
48.1°, Northern Spring

North azimuth:
96°

Sub-solar azimuth:
39.2°
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ANAGLYPHS
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Anaglyph details page

ADDITIONAL INFORMATION
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IRB: infrared-red-blue
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Black & white is 5 km across; enhanced color about 1 km
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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.