File:Sand Dunes, Junggar Basin, Northwestern China.JPG
Original file (4,288 × 2,848 pixels, file size: 12.22 MB, MIME type: image/jpeg)
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Summary
[edit]DescriptionSand Dunes, Junggar Basin, Northwestern China.JPG |
English: This photograph taken by an astronaut on the International Space Station highlights a sand dune field within the Burqin-Haba River-Jimunai Desert near the borders of China, Mongolia, Russia, and Kazakhstan. The dune field (approximately 32 kilometres long) is located immediately west-northwest of the city of Burqin (not shown), and is part of the Junggar Basin, a region of active petroleum production in north-western China. The Irtysh River—with associated wetlands and riparian vegetation (appearing grey-green in the image) —flows from its headwaters in the Altay Mountains towards Siberia (right to left across the image).
Tan, linear dunes at image centre (on the south side of the Irtysh River) dominate the view. The dunes are formed from mobile barchan (crescent-shaped) dunes moving from left to right in this view. The barchans eventually merge to form the large, linear dunes which can reach 50 to 100 meters in height. Sand moving along the southern edge of the field appears to be feeding a south-eastern lobe with a separate population of linear dunes (image lower right). The Burqin-Haba River-Jimunai Desert area also includes darker gravel-covered surfaces that form pavements known locally as gobi. At the resolution of an astronaut photograph, these are somewhat indistinguishable from the vegetated areas arresting some of the dunes. But gobi tend to be located on the flat regions between the dunes. |
Date | |
Source | NASA Earth Observatory |
Author | ISS Expedition 28 crew |
Camera location | 47° 42′ 00″ N, 86° 24′ 00″ E | View this and other nearby images on: OpenStreetMap | 47.700000; 86.400000 |
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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: ISS028-E-44444. 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 180 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.) | ||
Warnings:
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Annotations InfoField | This image is annotated: View the annotations at Commons |
wetlands
Irtysh River
linear dunes
barchan dunes
File history
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 15:38, 19 September 2011 | 4,288 × 2,848 (12.22 MB) | Originalwana (talk | contribs) | {{Information |Description ={{en|1=This photograph taken by an astronaut on the International Space Station highlights a sand dune field within the Burqin-Haba River-Jimunai Desert near the borders of China, Mongolia, Russia, and [[Kaza |
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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 | 1/500 sec (0.002) |
F-number | f/7.6 |
ISO speed rating | 200 |
Date and time of data generation | 09:59, 8 September 2011 |
Lens focal length | 180 mm |
Orientation | Normal |
Horizontal resolution | 240 dpi |
Vertical resolution | 240 dpi |
Software used | GIMP 2.6.8 |
File change date and time | 16:27, 19 September 2011 |
Exposure Program | Shutter priority |
Exif version | 2.21 |
Date and time of digitizing | 09:59, 8 September 2011 |
APEX shutter speed | 8.965784 |
APEX aperture | 5.851999 |
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 | 90 |
DateTimeOriginal subseconds | 90 |
DateTimeDigitized subseconds | 90 |
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 | 270 mm |
Scene capture type | Standard |
Contrast | Normal |
Saturation | Normal |
Sharpness | Normal |
Subject distance range | Unknown |