File:River Deltas, Lake Ayakum, Tibet.JPG
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DescriptionRiver Deltas, Lake Ayakum, Tibet.JPG |
English: This astronaut photograph highlights two river deltas formed along Lake Ayakum's south-western shoreline. Gray to tan surfaces indicate prior positions of the river channels; the uniform coloration and smooth texture suggest that they are relatively old and now inactive. By contrast, the younger and currently active delta surfaces have reddish-brown sediment and visible river channels.
Lateral channel migration is particularly evident in the approximately 8-kilometer wide active delta at image upper left. The reddish color of the fresh sediment may indicate a change from the sources that formed the older parts of the deltas. It might indicate weathering and soil formation on the older deposits. It could even be a sign of episodic inputs of dust or other material to the river catchments. |
Date | |
Source | NASA Earth Observatory |
Author | ISS Expedition 27 crew |
Camera location | 37° 30′ 00″ N, 89° 12′ 00″ E | View this and other nearby images on: OpenStreetMap | 37.500000; 89.200000 |
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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: ISS027-E-16922. 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 ∙ +/− |
Image acquired with a Nikon D2Xs digital camera using a 400 mm lens, and is provided by the ISS Crew Earth Observations experiment and Image Science & Analysis Laboratory, Johnson Space Center.
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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Annotations InfoField | This image is annotated: View the annotations at Commons |
old surface
active delta
old surface
old surface
Lake Ayakum
active delta
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 11:50, 12 May 2011 | 4,288 × 2,850 (2.74 MB) | Originalwana (talk | contribs) | {{Information |Description ={{en|1=This astronaut photograph highlights two river deltas formed along Lake Ayakum's south-western shoreline. Gray to tan surfaces indicate prior positions of the river channels; the uniform coloration and smooth |
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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 | 1/160 sec (0.00625) |
F-number | f/10 |
ISO speed rating | 200 |
Date and time of data generation | 11:13, 25 April 2011 |
Lens focal length | 400 mm |
Orientation | Normal |
Horizontal resolution | 240 dpi |
Vertical resolution | 240 dpi |
Software used | Microsoft Windows Photo Gallery 6.0.6001.18000 |
File change date and time | 12:44, 12 May 2011 |
Exposure Program | Shutter priority |
Exif version | 2.21 |
Date and time of digitizing | 11:13, 25 April 2011 |
APEX shutter speed | 7.321928 |
APEX aperture | 6.643856 |
APEX exposure bias | 0 |
Maximum land aperture | 3 APEX (f/2.83) |
Metering mode | Pattern |
Light source | Unknown |
Flash | Flash did not fire |
DateTime subseconds | 81 |
DateTimeOriginal subseconds | 81 |
DateTimeDigitized subseconds | 81 |
Color space | sRGB |
Sensing method | One-chip color area sensor |
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 |
Contrast | Soft |
Saturation | Normal |
Sharpness | Normal |
Subject distance range | Unknown |