Slika:IssaouaneErg Algeria ISS010-E-13539.jpg

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Opis
English: Astronaut photo of the Issaouane Erg (Sahara Desert), Algeria.


International Space Station InsigniaISS Crew Earth Observations: ISS010-E-13539International Space Station Insignia
Identification
Mission ISS010 (Expedition 10)
Roll E
Frame 13539
Country or Geographic Name ALGERIA
Features ISSAOUANE SAND SEA, STAR DUNES
Center Point Latitude 26.8° N
Center Point Longitude 7.3° E
Camera
Camera Tilt High Oblique
Camera Focal Length 800 mm
Camera Kodak DCS760C Electronic Still Camera
Film 3060 x 2036 pixel CCD, RGBG array.
Quality
Percentage of Cloud Cover 0-10%
Nadir What is Nadir?
Date 2005-01-16
Time 14:25:12
Nadir Point Latitude 36.7° N
Nadir Point Longitude 19.4° E
Nadir to Photo Center Direction Southwest
Sun Azimuth 230°
Spacecraft Altitude 188 nautical miles (348 km)
Sun Elevation Angle 14°
Orbit Number 3185
Original image caption
The Issaouane Erg (sand sea) is located in eastern Algeria between the Tinrhert Plateau to the north and the Fadnoun Plateau to the south. Ergs are vast areas of moving sand with little to no vegetation cover. Considered to be part of the Sahara Desert, the Issaouane Erg covers an area of approximately 38,000 km2. These complex dunes form the active southwestern border of the sand sea.

The most common landforms in the image are star dunes and barchan (or crescent) dunes. Small linear dunes appear at top left. Star dunes are formed when sand is transported from variable wind directions, whereas barchan dunes form in a single dominant wind regime. The superimposition of two dune types suggests that wind regimes have changed through time. The active nature of this portion of the Erg is well illustrated by this image—smaller dunes form and migrate along the flanks of the larger dunes and sand ridges. Occasional precipitation fills basins formed by the dunes; as the water evaporates, salt deposits are left behind which appear as bluish-white areas.

Datum
Vir http://earthobservatory.nasa.gov/Newsroom/NewImages/images.php3?img_id=16813
Avtor ISS Crew Earth Observations experiment and the Image Science & Analysis Group, Johnson Space Center.
Dovoljenje
(Nadaljnja uporaba datoteke)		 NASA, public domain

Licenca

Public domain
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: ISS010-E-13539.

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16. januar 2005

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trenutno19:58, 18. maj 2006Sličica za različico z datumom 19:58, 18. maj 20061.000 × 662 (491 KB)Holly Cheng==Summary== {{Information | Description=Astronaut photo of the Issaouane Erg (Sahara Desert), Algeria. | Source=http://earthobservatory.nasa.gov/Newsroom/NewImages/images.php3?img_id=16813 | Date=January 16, 2005 | Author=ISS Crew Earth Observations exper

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