Status Report

NASA Mars Odyssey THEMIS Image: Elysium Mons

By SpaceRef Editor
May 25, 2005
Filed under , , ,

Medium image for 20050525a

Image Context:

Context image for 20050525a
Context image credit: NASA/Mars Orbiter Laser Altimeter (MOLA) Team
[ Find on map: Javascript version ]

[ Find on map: CGI version ]

ParameterValue ParameterValue
Latitude24.5 &nbsp InstrumentVIS
Longitude147.1E (212.9W) &nbsp Resolution (m)37
Image Size (pixels)1680×742 &nbsp Image Size (km)62.2×27.5

The THEMIS VIS camera is capable of capturing color images of the

Martian surface using five different color filters. In this mode of

operation, the spatial resolution and coverage of the image must

be reduced to accommodate the additional data volume produced from

using multiple filters. To make a color image, three of the five

filter images (each in grayscale) are selected. Each is contrast

enhanced and then converted to a red, green, or blue intensity image.

These three images are then combined to produce a full color, single

image. Because the THEMIS color filters don’t span the full range

of colors seen by the human eye, a color THEMIS image does not

represent true color. Also, because each single-filter image is

contrast enhanced before inclusion in the three-color image, the

apparent color variation of the scene is exaggerated. Nevertheless,

the color variation that does appear is representative of some change

in color, however subtle, in the actual scene. Note that the long

edges of THEMIS color images typically contain color artifacts

that do not represent surface variation.

This false color image is of the eastern flank of

Elysium Mons volcano. This image was collected during

the Northern Spring season.

[Source: ASU THEMIS Science Team]

Note: this THEMIS visual 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

[ Show Full-Size Image (GIF) ] [ Show Full-Size Image (JPG) ]
[ Show Full-Size Image (PNG) ] [ Show Full-Size Image (TIF) ]
[ Printer-friendly version ]

SpaceRef staff editor.