File:Ounianga Lakes from ISS.jpg

原始檔案(4,288 × 2,848 像素,檔案大小:3.88 MB,MIME 類型:image/jpeg


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English: Ounianga Sérir group. This astronaut photograph features one of the largest of a series of ten mostly fresh water lakes in the Ounianga Basin in the heart of the Sahara Desert of northeastern Chad. The lakes are remnants of a single large lake, probably tens of kilometers long, that once occupied this remote area approximately 14,800 to 5,500 years ago. As the climate dried out during the subsequent millennia, the lake shrank, and large, wind-driven sand dunes invaded the original depression, dividing it into several smaller basins.
The area shown in this image is approximately 11 by 9 kilometers. The lakes’ dark surfaces are almost completely segregated by linear, orange sand dunes that stream into the depression from the northeast. The almost-year-round northeast winds and cloudless skies make for very high evaporation rates; an evaporation rate of more than 6 meters per year has been measured in one of the nearby lakes. Despite this, only one of the ten lakes is saline.
日期 攝於2009年11月14日, 13:04 UTC
來源 http://earthobservatory.nasa.gov/IOTD/view.php?id=41425 at the Wayback Machine
作者 NASA
拍攝地點18° 55′ 48.29″ 北, 20° 52′ 15.35″ 東  Heading=0° Kartographer map based on OpenStreetMap.位於此地的本圖片與其他圖片: OpenStreetMapinfo
本圖像或影音收錄於美國國家航空暨太空總署 (NASA)休士頓太空中心(Johnson Space Center),其照片編號為: ISS021-E-26475

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This file is in the public domain in the United States because it was created by the Image Science & Analysis Laboratory, of the NASA Johnson Space Center. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (NASA media use guidelines or Conditions of Use of Astronaut Photographs). Photo source: ISS021-E-26475.

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18°55'48.29"N, 20°52'15.35"E

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目前2020年11月8日 (日) 12:33於 2020年11月8日 (日) 12:33 版本的縮圖4,288 × 2,848(3.88 MB)Ras67new rendered in high quality and native resolution from NASA's raw image data
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2009年12月2日 (三) 20:08於 2009年12月2日 (三) 20:08 版本的縮圖1,440 × 960(316 KB)Monfornot{{Information |Description={{en|1=This astronaut photograph features one of the largest of a series of ten mostly fresh water lakes in the Ounianga Basin in the heart of the Sahara Desert of northeastern Chad. The lakes are remnants of a single large lake

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