Fine-Branched Ridges
Fine-Branched Ridges
ESP_024497_1745  Science Theme: Fluvial Processes
This image shows numerous branching ridges with various degrees of sinuosity. These branching forms resemble tributaries funneling and draining into larger channel trunks towards the upper portion of the scene.

The raised relief of these branching ridges suggests that these are ancient channels are inverted due to lithification and cementation of the riverbed sediment, which made it more resistant to erosion than the surrounding material. Wind-blown bedforms are abundant and resemble small ridges that are aligned in an approximately north-south direction.

Written by: Austin S. Guynn and Marjorie A. Chan (audio: Tre Gibbs)  (14 October 2015)

This is a stereo pair with PSP_007474_1745.
Acquisition date
18 October 2011

Local Mars time

Latitude (centered)

Longitude (East)

Spacecraft altitude
268.3 km (166.8 miles)

Original image scale range
61.3 cm/pixel (with 2 x 2 binning) so objects ~184 cm across are resolved

Map projected scale
50 cm/pixel and North is up

Map projection

Emission angle

Phase angle

Solar incidence angle
37°, with the Sun about 53° above the horizon

Solar longitude
16.9°, Northern Spring

For non-map projected images
North azimuth:  96°
Sub-solar azimuth:  28.7°
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non-map           (148MB)

IRB color
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non-map           (140MB)

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RGB color
non map           (130MB)
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Full resolution JP2 download
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Black & white is 5 km across; enhanced color about 1 km
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NASA/JPL/University of Arizona

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.