File:Mars Viking MDIM21 1km plus poles.jpg
Original file (26,674 × 10,670 pixels, file size: 46.26 MB, MIME type: image/jpeg)
Captions
Warning | The original file is very high-resolution. It might not load properly or could cause your browser to freeze when opened at full size. | Open in ZoomViewer |
---|
Summary
[edit]DescriptionMars Viking MDIM21 1km plus poles.jpg |
English: This global image map of Mars has a resolution of approximately 1.0 km/pixel at the equator. It is a reduced version of a much larger map with 231 m/pixel resolution at the equator. The colorized mosaic was completed by NASA Ames which warped the original Viking colorized mosaic and blended over the latest black/white mosaic. The full resolution mosaic is known as Colorized Mars Digital Image Model (MDIM) 2.1. MDIM 2.1 replaces two earlier mosaics produced by the USGS from the same set of approximately 4600 Viking Orbiter images. The positional accuracy of features in MDIM 2.1 is estimated to be roughly one pixel (200 m), compared to 3 km for MDIM 2.0 released in 2001 and >6 km for MDIM 1.0 released in 1991. In addition to relatively imprecise geodetic control, the previous mosaics were affected by changing definitions of cartographic parameters (such as the definition of zero longitude), resulting in an overall longitude shift of as much as 0.2° between the early MDIMs and other datasets. The new mosaic uses the most recent coordinate system definitions for Mars. These definitions have been widely adopted by NASA missions and other users of planetary data and are likely to remain in use for a decade or more. As a result, MDIM 2.1 not only registers precisely with data from current missions, such as MGS and 2001 Mars Odyssey, but will serve as an accurate basemap on which data from future missions can be plotted. The images used to make MDIM 2.1 were obtained primarily through the red, clear, and minus-blue filters of the Viking Orbiter imaging system, and thus provide a monochromatic view of Mars weighted toward the red end of the visible spectrum. Images were obtained with a wide range of solar incidence angles. It is unfortunately not possible to correct the appearance of both albedo (reflectivity) variations and topographic features for these incidence angle variations simultaneously. The images have therefore been highpass-filtered at a scale of ~50 km to remove regional albedo variations and then normalized so that equal topographic slopes appear with equal contrast everywhere. Photometric processing for MDIM 2.1 incorporates a model of the transmission and scattering of light in the atmosphere that is substantially improved over that used in MDIM 2.0. Residual tonal mismatches between different images after photometric correction were corrected based on a least-squares adjustment of image brightness and contrast. Because of these photometric and cosmetic improvements, it was possible to use a less severe highpass filter than for MDIM 2.0, improving the overall appearance of the mosaic. The original USGS polar mosaics were increased in size by a linear factor of 1.6 and given margins before being appended to the USGS global mosaic. |
Date | |
Source | https://astrogeology.usgs.gov/search/details/Mars/Viking/MDIM21/Mars_Viking_MDIM21_ClrMosaic_global_232m/cub |
Author | NASA / Jet Propulsion Lab / USGS |
Other versions |
|
Licensing
[edit]Public domainPublic domainfalsefalse |
This work is in the public domain in the United States because it is a work prepared by an officer or employee of the United States Government as part of that person’s official duties under the terms of Title 17, Chapter 1, Section 105 of the US Code.
Note: This only applies to original works of the Federal Government and not to the work of any individual U.S. state, territory, commonwealth, county, municipality, or any other subdivision. This template also does not apply to postage stamp designs published by the United States Postal Service since 1978. (See § 313.6(C)(1) of Compendium of U.S. Copyright Office Practices). It also does not apply to certain US coins; see The US Mint Terms of Use.
|
||
This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights. |
https://creativecommons.org/publicdomain/mark/1.0/PDMCreative Commons Public Domain Mark 1.0falsefalse
File history
Click on a date/time to view the file as it appeared at that time.
Date/Time | Thumbnail | Dimensions | User | Comment | |
---|---|---|---|---|---|
current | 06:30, 14 March 2014 | 26,674 × 10,670 (46.26 MB) | WolfmanSF (talk | contribs) | User created page with UploadWizard |
You cannot overwrite this file.
File usage on Commons
The following 4 pages use this file:
File usage on other wikis
The following other wikis use this file:
- Usage on ar.wikipedia.org
- Usage on el.wikipedia.org
- Usage on en.wikipedia.org
- Usage on fa.wikipedia.org
- Usage on hr.wikipedia.org
- Usage on uk.wikipedia.org
- Usage on vi.wikipedia.org
Metadata
This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.
Orientation | Normal |
---|---|
Horizontal resolution | 72 dpi |
Vertical resolution | 72 dpi |
Software used | Adobe Photoshop Elements 9.0 Windows |
File change date and time | 23:11, 13 March 2014 |
Color space | sRGB |
Image width | 26,674 px |
Image height | 10,670 px |
Date and time of digitizing | 22:27, 13 March 2014 |
Date metadata was last modified | 16:11, 13 March 2014 |
Unique ID of original document | xmp.did:7BFC793B3BABE3118817A2B021119D38 |