跳转到内容

File:Richat Structure - SRTM.jpg

页面内容不支持其他语言。
这个文件来自维基共享资源
维基百科,自由的百科全书

原始文件 (2,259 × 1,244像素,文件大小:495 KB,MIME类型:image/jpeg


摘要

描述
English: PIA04963: Richat Structure, Mauritania - This prominent circular feature, known as the Richat Structure, in the Sahara desert of Mauritania is often noted by astronauts because it forms a conspicuous 50-kilometer-wide (30-mile-wide) bull's-eye on the otherwise rather featureless expanse of the desert. Initially mistaken for a possible impact crater, it is now known to be an eroded circular anticline (structural dome) of layered sedimentary rocks.

Extensive sand dunes occur in this region and the interaction of bedrock topography, wind, and moving sand is evident in this scene. Note especially how the dune field ends abruptly short of the cliffs at the far right as wind from the northeast (lower right) apparently funnels around the cliff point, sweeping clean areas near the base of the cliff. Note also the small isolated peak within the dune field. That peak captures some sand on its windward side, but mostly deflects the wind and sand around its sides, creating a sand-barren streak that continues far downwind.

This view was generated from a Landsat satellite image draped over an elevation model produced by the Shuttle Radar Topography Mission (SRTM). The view uses a 6-times vertical exaggeration to greatly enhance topographic expression. For vertical scale, note that the height of the mesa ridge in the back center of the view is about 285 meters (about 935 feet) tall. Colors of the scene were enhanced by use of a combination of visible and infrared bands, which helps to differentiate bedrock (browns), sand (yellow, some white), minor vegetation in drainage channels (green), and salty sediments (bluish whites). Some shading of the elevation model was included to further highlight the topographic features.

Elevation data used in this image was acquired by the Shuttle Radar Topography Mission (SRTM) aboard the Space Shuttle Endeavour, launched on February 11, 2000. SRTM used the same radar instrument that comprised the Spaceborne Imaging Radar-C/X-Band Synthetic Aperture Radar (SIR-C/X-SAR) that flew twice on the Space Shuttle Endeavour in 1994. SRTM was designed to collect three-dimensional measurements of the Earth's surface. To collect the 3-D data, engineers added a 60-meter-long (200-foot) mast, installed additional C-band and X-band antennas, and improved tracking and navigation devices. The mission is a cooperative project between the National Aeronautics and Space Administration (NASA), the National Geospatial-Intelligence Agency (NGA) of the U.S. Department of Defense (DoD), and the German and Italian space agencies. It is managed by NASA's Jet Propulsion Laboratory, Pasadena, Calif., for NASA's Earth Science Enterprise, Washington, D.C.

View Size: 68 kilometers (42 miles) wide by 112 kilometers (69 miles) distance
Location: 21.2 degrees North latitude, 11.7 degrees West longitude
Orientation: View toward west-northwest
Image Data: Landsat Bands 1, 4, 7 in B.G.R.
Date Acquired: February 2000 (SRTM), January 13, 1987 (Landsat)
日期 (released)
来源 https://photojournal.jpl.nasa.gov/catalog/PIA04963
作者 NASA/JPL/NIMA

维基百科

 本文件是英语维基百科特色图片(Featured pictures),并被视为最好的图像之一。

如果你认为本文件应该被选为维基共享资源特色内容,请推荐本文件
如果你拥有相似质量的可采用适当著作权许可协议发布的图像,一定要上传标记推荐它。

本图像或视频收录于美国国家航空航天局 (NASA)喷气推进实验室(Jet Propulsion Laboratory),其照片编号是: PIA04963

此标签不表示文件的著作权状态。任何文件在附有此标签的同時还需要一个有效的著作权标签请参阅许可协议说明页面以了解更多信息。
其他语言:

许可协议

Public domain
Public domain
本图像是用的高分辨率数字地形数据来自NASA的JPL-Caltech[1]航天飞机雷达地形测绘使命 (SRTM)。它属于公有领域

NASA shuttle
NASA shuttle
English | Bahasa Indonesia | македонски | polski | português | 中文 | 中文(简体)‎ | +/−

说明

添加一行文字以描述该文件所表现的内容

此文件中描述的项目

描绘内容

文件历史

点击某个日期/时间查看对应时刻的文件。

日期/时间缩⁠略⁠图大小用户备注
当前2005年5月15日 (日) 23:342005年5月15日 (日) 23:34版本的缩略图2,259 × 1,244(495 KB)AtamariPIA04963: Richat Structure, Mauritania, Perspective View, Landsat Image over SRTM Elevation Source: http://photojournal.jpl.nasa.gov/catalog/PIA04963 {{GFDL}}{{SpaceShuttle}} Category:Mauritania\

以下页面使用本文件:

全域文件用途

以下其他wiki使用此文件:

查看此文件的更多全域用途

元数据