File:Kaiser Crater - False Color (PIA26059).jpg

From Wikimedia Commons, the free media repository
Jump to navigation Jump to search

Original file (660 × 1,431 pixels, file size: 91 KB, MIME type: image/jpeg)

Captions

Captions

The THEMIS VIS camera contains 5 filters. The data from different filters can be combined in multiple ways to create a false color image.

Summary

[edit]
Description
English: 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 the floor of Kaiser Crater. Kaiser Crater is 207 km (129 miles) in diameter and is located in Noachis Terra west of Hellas Planitia. This sand dune field is one of several regions of sand dunes located on the southern part of the crater floor. The image also shows the complex crater floor beneath the dunes. These dunes are composed of basaltic sand that has collected in the bottom of the crater. The topographic depression of the crater forms a sand trap that prevents the sand from escaping. Dune fields are common in the bottoms of craters on Mars and appear as dark splotches that often lean up against the downwind walls of the craters. Dunes are useful for studying both the geology and meteorology of Mars. The sand forms by erosion of larger rocks, but it is unclear when and where this erosion took place on Mars or how such large volumes of sand could be formed. The dunes also indicate the local wind directions by their morphology. 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: 91155 Latitude: -46.9827 Longitude: 19.3481 Instrument: VIS Captured: 2022-07-02 23:58 https://photojournal.jpl.nasa.gov/catalog/PIA26059
Date Taken on 17 August 2023
Source
This image or video was catalogued by Jet Propulsion Laboratory of the United States National Aeronautics and Space Administration (NASA) under Photo ID: PIA26059.

This tag does not indicate the copyright status of the attached work. A normal copyright tag is still required. See Commons:Licensing.
Other languages:
Author NASA Jet Propulsion Laboratory / NASA/JPL-Caltech/ASU

Licensing

[edit]
Public domain This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.)
Warnings:

File history

Click on a date/time to view the file as it appeared at that time.

Date/TimeThumbnailDimensionsUserComment
current01:31, 5 December 2023Thumbnail for version as of 01:31, 5 December 2023660 × 1,431 (91 KB)OptimusPrimeBot (talk | contribs)#Spacemedia - Upload of http://images-assets.nasa.gov/image/PIA26059/PIA26059~orig.jpg via Commons:Spacemedia

There are no pages that use this file.