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NASA Mars Odyssey THEMIS Image: DCS in Hesperia Planum

Status Report From: Mars Odyssey THEMIS
Posted: Friday, July 30, 2004

Medium image for 20040730A
Image Context:
Context image for 20040730A
Context image credit: NASA/Mars Orbiter Laser Altimeter (MOLA) Team
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ParameterValue ParameterValue
Latitude-16.6   InstrumentIR
Longitude119.3E (240.7W)   Resolution (m)100
Image Size (pixels)5152x320   Image Size (km)515.2x32

This image is part of the following themes:

Full data on this image has now been released via the THEMIS Data Releases website.

This image shows two representations of the same infra-red image in Hesperia Planum, west of Herschel Crater. On the left is a grayscale image showing surface temperature, and on the right is a false-color composite made from 3 individual THEMIS bands. The false-color image is colorized using a technique called decorrelation stretch (DCS), which emphasizes the spectral differences between the bands to highlight compositional variations.

The two primary compositions that cover most of Mars - dust and basalt (probably in the form of sand) - are well represented in this image. In this image, the dust is green in color and the basalt is pink/magenta. The strongest basaltic signatures appear in the bottoms of craters, which act as topographic traps for the sand. Green dust streaks appear behind many of the smaller craters. The topographic relief of the crater prevents the wind from cleansing the dust from the surface. These features enable the determination of the prevailing wind direction in the region.

[Source: ASU THEMIS Science Team]

Note: this THEMIS infrared image has not been radiometrically nor geometrically calibrated for this preliminary release. An empirical correction has been performed to remove instrumental effects. A linear shift has been applied in the cross-track and down-track direction to approximate spacecraft and planetary motion. Fully calibrated and geometrically projected images will be released through the Planetary Data System in accordance with Project policies at a later time.

NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena.

Image Credit: NASA/JPL/Arizona State University


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