File:Richat Structure ISS030-E-12516.jpg
Original file (4,288 × 2,848 pixels, file size: 2.78 MB, MIME type: image/jpeg)
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Summary[edit]
DescriptionRichat Structure ISS030-E-12516.jpg |
English: The Richat Structure of Mauritania has captured the attention of astronauts for about as long as NASA has sent humans into orbit around Earth. This circular geologic feature is thought to be caused by an uplifted dome—geologists would classify it as a domed anticline—that has been eroded to expose the originally flat rock layers.
In this type of geologic structure, rocks exposed in the center of the “bullseye” are older than rocks forming the outer rings. This structure measures 45 kilometers (28 miles) across and is made up of igneous and sedimentary rocks. There are several faults visible (lower left) where strata that were once continuous have been shifted apart. Most of Mauritania lies within the Sahara Desert, where dry climate conditions and periodic droughts create difficult living conditions. Approximately 3.7 million people live in Mauritania, though much of the population lives along its Atlantic coastline, about 500 kilometers (300 miles) from the Richat Structure. Astronaut photograph ISS030-E-12516 was acquired on December 17, 2011, with a Nikon D2Xs digital camera using a 400 millimeter lens and is provided by the ISS Crew Earth Observations Facility and the Earth Science and Remote Sensing Unit, Johnson Space Center. The image was taken by a member of the Expedition 30 crew. The image has been cropped and enhanced to improve contrast, and lens artifacts have been removed. The International Space Station Program supports the laboratory as part of the ISS National Lab to help astronauts take pictures of Earth that will be of the greatest value to scientists and the public, and to make those images freely available on the Internet. Additional images taken by astronauts and cosmonauts can be viewed at the NASA/JSC Gateway to Astronaut Photography of Earth. Caption by Andrea Meado, Jacobs Technology, JETS Contract at NASA-JSC. |
Date | Taken on 17 December 2011, 17:28:02 |
Source | https://earthobservatory.nasa.gov/images/92071/richat-structure; see also https://eol.jsc.nasa.gov/SearchPhotos/photo.pl?mission=ISS030&roll=E&frame=12516 |
Author | NASA |
Geographic Area InfoField | Mauritania |
Features InfoField | RICHAT STRUCTURE, SAHARA DESERT |
Clouds Percentage InfoField | 10% |
Look angle InfoField | HO |
Look direction InfoField | NE |
Sun Azimuth InfoField | 240° |
Sun Elevatation InfoField | 14° |
Altitude InfoField | 219 nautical miles (406 km) |
Mission InfoField | ISS030 |
Roll InfoField | E |
Frame InfoField | 12516 |
Camera InfoField | Nikon D2Xs Electronic Still Camera |
Focal length InfoField | 400 mm |
Object location | 21° 06′ 00″ N, 11° 24′ 00″ W | View this and other nearby images on: OpenStreetMap | 21.100000; -11.400000 |
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This image or video was catalogued by Johnson Space Center of the United States National Aeronautics and Space Administration (NASA) under Photo ID: ISS030-E-12516 and Alternate ID: ISS030E12516. This tag does not indicate the copyright status of the attached work. A normal copyright tag is still required. See Commons:Licensing. Other languages:
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Licensing[edit]
Public domainPublic domainfalsefalse |
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.) | ||
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File history
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 16:55, 25 February 2021 | 4,288 × 2,848 (2.78 MB) | Jstuby (talk | contribs) | Uploaded a work by NASA from NASA Earth Observatory, [https://earthobservatory.nasa.gov/images/92071/richat-structure Richat Structure] with UploadWizard |
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File usage on Commons
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- File:ISS030-E-12516 - View of Mauritania.jpg (file redirect)
File usage on other wikis
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- Usage on en.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.
Camera manufacturer | NIKON CORPORATION |
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Camera model | NIKON D2Xs |
Exposure time | 1/500 sec (0.002) |
F-number | f/4.8 |
ISO speed rating | 200 |
Date and time of data generation | 17:28, 17 December 2011 |
Lens focal length | 400 mm |
User comments | NASA 1118 78.3F |
Width | 4,288 px |
Height | 2,848 px |
Bits per component |
|
Compression scheme | LZW |
Pixel composition | RGB |
Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 300 dpi |
Vertical resolution | 300 dpi |
Data arrangement | chunky format |
Software used | Adobe Photoshop CC (Windows) |
File change date and time | 11:00, 27 April 2018 |
Exposure Program | Shutter priority |
Exif version | 2.21 |
Date and time of digitizing | 17:28, 17 December 2011 |
APEX shutter speed | 8.965784 |
APEX aperture | 4.526069 |
APEX exposure bias | 0 |
Maximum land aperture | 3 APEX (f/2.83) |
Metering mode | Spot |
Light source | Unknown |
Flash | Flash did not fire |
DateTime subseconds | 07 |
DateTimeOriginal subseconds | 07 |
DateTimeDigitized subseconds | 07 |
Color space | Uncalibrated |
Sensing method | One-chip color area sensor |
File source | Digital still camera |
Scene type | A directly photographed image |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Focal length in 35 mm film | 600 mm |
Scene capture type | Standard |
Scene control | None |
Contrast | Soft |
Saturation | Normal |
Sharpness | Normal |
Subject distance range | Unknown |
Serial number of camera | 6027244 |
Lens used | 400.0 mm f/2.8 |
Rating (out of 5) | 0 |
Date metadata was last modified | 07:00, 27 April 2018 |
Unique ID of original document | 67951701816CE4C8E63E58962262E430 |