File:Ounianga Lakes from ISS.jpg
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Summary
editDescriptionOunianga Lakes from ISS.jpg |
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. |
Date | Taken on 14 November 2009, 13:04 UTC |
Source | http://earthobservatory.nasa.gov/IOTD/view.php?id=41425 at the Wayback Machine |
Author | NASA |
Camera location | 18° 55′ 48.29″ N, 20° 52′ 15.35″ E | View this and other nearby images on: OpenStreetMap | 18.930080; 20.870930 |
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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: ISS021-E-26475. This tag does not indicate the copyright status of the attached work. A normal copyright tag is still required. See Commons:Licensing. Other languages:
العربية ∙ беларуская (тарашкевіца) ∙ български ∙ català ∙ čeština ∙ dansk ∙ Deutsch ∙ English ∙ español ∙ فارسی ∙ français ∙ galego ∙ magyar ∙ հայերեն ∙ Bahasa Indonesia ∙ italiano ∙ 日本語 ∙ македонски ∙ മലയാളം ∙ Nederlands ∙ polski ∙ português ∙ русский ∙ sicilianu ∙ slovenščina ∙ Türkçe ∙ українська ∙ 简体中文 ∙ 繁體中文 ∙ +/− |
Licensing
editPublic domainPublic domainfalsefalse |
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.
العربيَّة | Deutsch | English | español | français | italiano | kurdî | македонски | മലയാളം | português | sicilianu | +/− |
Annotations InfoField | This image is annotated: View the annotations at Commons |
lake water
floating reed beds
linear sand dune
Ounianga Sérir
Lake Téli
File history
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 12:33, 8 November 2020 | 4,288 × 2,848 (3.88 MB) | Ras67 (talk | contribs) | new rendered in high quality and native resolution from NASA's raw image data | |
20:10, 2 December 2009 | 1,440 × 960 (316 KB) | Monfornot (talk | contribs) | rotated north up | ||
20:08, 2 December 2009 | 1,440 × 960 (316 KB) | Monfornot (talk | contribs) | {{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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Camera manufacturer | NIKON CORPORATION |
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Camera model | NIKON D2Xs |
Exposure time | 1/500 sec (0.002) |
F-number | f/5.6 |
ISO speed rating | 100 |
Date and time of data generation | 13:04, 14 November 2009 |
Lens focal length | 800 mm |
Orientation | Normal |
Horizontal resolution | 240 dpi |
Vertical resolution | 240 dpi |
Software used | Adobe Photoshop |
File change date and time | 13:13, 8 November 2020 |
Exposure Program | Aperture priority |
APEX shutter speed | 8.965784 |
APEX aperture | 4.970854 |
APEX exposure bias | 0 |
Maximum land aperture | 5 APEX (f/5.66) |
Metering mode | Pattern |
Flash | Flash did not fire |
Color space | sRGB |
Focal length in 35 mm film | 1,200 mm |