Aorounga_crater.png (500 × 398 像素,檔案大小:191 KB,MIME 類型:image/png


摘要

描述
English: The impact of an asteroid or comet several hundred million years ago left scars in the landscape that are still visible in this spaceborne radar image of an area in the Sahara Desert of northern Chad. The concentric ring structure is the Aorounga impact crater, with a diameter of about 17 kilometers (10.5 miles). The original crater was buried by sediments, which were then partially eroded to reveal the current ring-like appearance. The dark streaks are deposits of windblown sand that migrate along valleys cut by thousands of years of wind erosion. The dark band in the upper right of the image is a portion of a proposed second crater. Scientists are using radar images to investigate the possibility that Aorounga is one of a string of impact craters formed by multiple impacts. Radar imaging is a valuable tool for the study of desert regions because the radar waves can penetrate thin layers of dry sand to reveal details of geologic structure that are invisible to other sensors. The image was acquired by the Spaceborne Imaging Radar-C/X-band Synthetic Aperture Radar (SIR-C/X-SAR) on April 18 and 19, 1994, onboard the space shuttle Endeavour. The area shown is 22 kilometers by 28 kilometers (14 miles by 17 miles) and is centered at 19.1 degrees north latitude, 19.3 degrees east longitude. North is toward the upper right. The colors are assigned to different radar frequencies and polarizations as follows: red is L-band, horizontally transmitted and received; green is C-band, horizontally transmitted and received; and blue is C-band, horizontally transmitted, vertically received. SIR-C/X-SAR, a joint mission of the German, Italian and United States space agencies, is part of NASA's Mission to Planet Earth program.
Image du cratère d'Aorounga (Radar à synthèse d'ouverture)
日期
來源

http://en.wikipedia.org/wiki/Image:Aorounga_crater.gif

image description here
作者 NASA
授權許可
(重用此檔案)
Domaine public
目標地點19° 05′ 17.48″ 北, 19° 15′ 04.82″ 東 Kartographer map based on OpenStreetMap.位於此地的本圖片與其他圖片: OpenStreetMapinfo

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原始上傳日誌

日期/時間 尺寸 使用者 備⁠註
2007年1月20日, 13:51:52 500 × 398 (218754 bytes) Varech (留言 · 貢獻) {{Information |Description=Image du cratère d'Aorounga ([[Radar à synthèse d'ouverture]]) |Source=http://upload.wikimedia.org/wikipedia/en/8/80/Aorounga_crater.gif |Date=07:36, 23 March 2005 |Author=NASA |Permission=Domaine public |other_versions= }}

說明

添加單行說明來描述出檔案所代表的內容
Radar image of Aorounga crater

在此檔案描寫的項目

描繪內容

奧隆加隕石坑 中文 (已轉換拼寫)

描述地坐標 中文 (已轉換拼寫)

19°5'17.477"N, 19°15'4.824"E

f3247ea38b6101e731ff3490f11a6c411da1a5c3

斷定方法:​SHA-1 中文 (已轉換拼寫)

195,900 位元組

398 像素

500 像素

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目前2014年8月17日 (日) 12:38於 2014年8月17日 (日) 12:38 版本的縮圖500 × 398(191 KB)GifTaggerBot: Converting file to superior PNG file. (Source: Aorounga_crater.gif). This GIF was problematic due to non-greyscale color table.

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