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  Image: Geographic Location Direction Photo #: ISS010-E-13539 Date: Jan. 2005
Geographic Region: ALGERIA
Feature: ISSAOUANE SAND SEA, STAR DUNES

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  View Low-Resolution Image  
  Issaouane Erg, Algeria

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.

 
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Images: All Available Images Low-Resolution 302k
Mission: ISS010  
Roll - Frame: E - 13539
Geographical Name: ALGERIA  
Features: ISSAOUANE SAND SEA, STAR DUNES  
Center Lat x Lon: 26.8N x 7.3E
Film Exposure:   N=Normal exposure, U=Under exposed, O=Over exposed, F=out of Focus
Percentage of Cloud Cover-CLDP: 10
 
Camera: E4
 
Camera Tilt: HO   LO=Low Oblique, HO=High Oblique, NV=Near Vertical
Camera Focal Length: 800  
 
Nadir to Photo Center Direction: SW   The direction from the nadir to the center point, N=North, S=South, E=East, W=West
Stereo?:   Y=Yes there is an adjacent picture of the same area, N=No there isn't
Orbit Number: 3185  
 
Date: 20050116   YYYYMMDD
Time: 142512   GMT HHMMSS
Nadir Lat: 36.7N  
Latitude of suborbital point of spacecraft
Nadir Lon: 19.4E  
Longitude of suborbital point of spacecraft
Sun Azimuth: 230   Clockwise angle in degrees from north to the sun measured at the nadir point
Space Craft Altitude: 188   nautical miles
Sun Elevation: 14   Angle in degrees between the horizon and the sun, measured at the nadir point
Land Views: DESERT, DUNE, PLATEAU  
Water Views: SEA  
Atmosphere Views:  
Man Made Views:  
City Views:  
Photo is not associated with any sequences


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