Angustus Labyrinthus - False Color

Scaled Image

Image Credit: NASA/JPL/ASU

About this 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 part of Angustus Labyrinthus. Angustus Labyrinthus is a unique region near the south polar cap. In the center of this image squares formed by intersecting ridges are visible. The feature earned the informal name of the Inca City when it was discovered in Mariner 9 images in 1972.The linear ridges are believed to have formed by volcanic and tectonic forces, where magma filled fractures in the subsurface and then erosion revealed the magmatic material.

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.

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

Context

Image ID: 
V85024003 (View data in Mars Image Explorer)
-81.1964
296.058
85024
2021-02-13 03:55
Thu, 2021-12-09
VIS
256 pixels (16 km)
3792 pixels (242 km)
0.063847 km/pixel
0.0645562 km/pixel

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