PIA25000: Sirenum Fossae - False Color


Sirenum Fossae - False Color

Caption:

Context image for PIA25000
Context image

The THEMIS VIS camera contains 5 filters. The data from different filters can be combined in multiple ways to create a false color image. These false color images may reveal subtle variations of the surface not easily identified in a single band image. Today's false color image shows some of the graben that comprise Sirenum Fossae. The linear features, called graben, are created in regions of extensional tectonic stress, where the bedrock is faulted and pulled apart, allowing linear sections of the surface to drop downward along paired faults. The Sirenum Fossae graben are 2735km (1700 miles) long.

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.

Orbit Number: 83743 Latitude: -37.2437 Longitude: 191.251 Instrument: VIS Captured: 2020-10-30 16:21

Background Info:

Please see the THEMIS Data Citation Note for details on crediting THEMIS images.

NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Science Mission Directorate, 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.

Cataloging Keywords:

Name Value Additional Values
Target Mars
System
Target Type Planet
Mission 2001 Mars Odyssey
Instrument Host Mars Odyssey
Host Type Orbiter
Instrument Thermal Emission Imaging System (THEMIS)
Detector
Extra Keywords Color, Thermal
Acquisition Date
Release Date 2021-11-26
Date in Caption 2020-10-30
Image Credit NASA/JPL-Caltech/ASU
Source photojournal.jpl.nasa.gov/catalog/PIA25000
Identifier PIA25000