skip menus
Home >> Advanced Search >>

The Gateway to Astronaut Photography of Earth

(NASA Crew Earth Observations)


















Photographing the Earth from the International Space Station

Astronaut Photography of Earth - Display Record

ISS022-E-5258

Low-resolution Browse Image

(Most browse images are not color adjusted.)

Images

Conditions for Use of Images >>
Image Transformation Tutorial >>   Saving, Color Adjusting, and Printing Images >>

Images to View on Your Computer Now

File NameFile Size (bytes)WidthHeightAnnotatedCroppedPurposeComments
View ISS022-E-5258.JPG 85403640437 No No
View ISS022-E-5258.JPG 306270540359 Yes Yes NASA's Earth Observatory web site
View ISS022-E-5258.JPG 9288561000664 No Yes NASA's Earth Observatory web site
View ISS022-E-5258.JPG 132071642882929 No No

Request the original image file.

Download a Keyhole Markup Language (KML) file for use in Google Earth.

Electronic Image Data

Camera Files >> No sound file available.

Identification

Mission: ISS022 Roll: E Frame: 5258 Mission ID on the Film or image: ISS022
Country or Geographic Name: NIGER
Features: SAND DUNES, TENERE DESERT, ERG OF BILMA
Center Point: Latitude: 17.2 Longitude: 11.5 (Negative numbers indicate south for latitude and west for longitude)

Stereo: (Yes indicates there is an adjacent picture of the same area)
ONC Map ID: JNC Map ID:

Camera

Camera Tilt: 40
Camera Focal Length: 400mm
Camera: N2: Nikon D2Xs
Film: 4288E : 4288 x 2848 pixel CMOS sensor, RGBG imager color filter.

Quality

Film Exposure:
Percentage of Cloud Cover: 10 (0-10)

Nadir

GMT Date: 20091201 (YYYYMMDD) GMT Time: 064436 (HHMMSS)
Nadir Point Latitude: 15.7, Longitude: 9.5 (Negative numbers indicate south for latitude and west for longitude)

Nadir to Photo Center Direction: Northeast
Sun Azimuth: 118 (Clockwise angle in degrees from north to the sun measured at the nadir point)
Spacecraft Altitude: 181 nautical miles (335 km)
Sun Elevation Angle: 15 (Angle in degrees between the horizon and the sun, measured at the nadir point)
Orbit Number: 3228

Captions

Sand Dunes in the Tenéré Desert, Niger

This detailed astronaut photograph highlights sand dunes in the Fachi-Bilma erg (sand sea) in the central-eastern part of the Tenéré Desert. The Tenéré occupies much of southeastern Niger and is considered to be part of the larger Sahara Desert, which stretches across northern Africa. Much of the Sahara is comprised of ergs; with an area of approximately 150,000 square kilometers (57,915 square miles), the Fachi-Bilma is one of the larger sand seas.

Two major types of dunes are visible in the image. Large, roughly north-south oriented transverse dunes fill the image frame. This type of dune tends to form at roughly right angles to the dominant, northeasterly winds. The dune crests are marked in this image by darker, steeper sand accumulations that cast shadows. The lighter-toned zones between are lower, interdune “flats.” The large dunes appear to be highly symmetrical with regard to their crests. This pattern suggests that the crest sediments are coarser, preventing the formation of a steeper slip face on the downwind side of the dune by wind-driven motion of similarly sized sand grains.

This particular form of transverse dune is known as a zibar, and it is thought to form by winnowing of smaller sand grains by the wind, which leaves the coarser grains to form dune crests. A second set of thin linear dunes oriented at roughly right angles to the zibar dunes appears to be formed on the larger landforms and is therefore a younger landscape feature. These dunes appear to be forming from finer grains in the same wind field as the larger zibars.


Download Packaged File.
This option downloads the following items, packaged into a single file, if they are available:
  • Browse image
  • Large JPEG
  • Cataloged information with captions
  • Camera file
  • Sound file


Search the Astronaut Photography Database