STS099-729-45
| NASA Photo ID | STS099-729-45 |
| Focal Length | 250mm |
| Date taken | 2000.02.__ |
| Time taken | GMT |
Resolutions offered for this image:
1031 x 1024 pixels 2063 x 2048 pixels 4127 x 4096 pixels 515 x 512 pixels
1031 x 1024 pixels 2063 x 2048 pixels 4127 x 4096 pixels 515 x 512 pixels
Cloud masks available for this image:
Spacecraft nadir point:
Photo center point: 28.0° N, 3.5° W
Photo center point: 28.0° N, 3.5° W
Nadir to Photo Center:
Spacecraft Altitude: nautical miles (0km)
Country or Geographic Name: | ALGERIA |
Features: | IGUIDI DUNES |
| Features Found Using Machine Learning: | |
Cloud Cover Percentage: | 10 (1-10)% |
Sun Elevation Angle: | ° |
Sun Azimuth: | ° |
Camera: | Hasselblad |
Focal Length: | 250mm |
Camera Tilt: | |
Format: | 5069: Kodak Elite 100S, E6 Reversal, Replaces Lumiere, Warmer in tone vs. Lumiere |
Film Exposure: | |
| Additional Information | |
| Width | Height | Annotated | Cropped | Purpose | Links |
|---|---|---|---|---|---|
| 1031 pixels | 1024 pixels | No | No | Download Image | |
| 2063 pixels | 2048 pixels | No | No | Download Image | |
| 4127 pixels | 4096 pixels | No | No | Download Image | |
| 515 pixels | 512 pixels | No | No | Download Image |
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Image Caption: Erg Chech Dunes, Algeria
Linear dunes in the Algerian Saharan sand sea known as the Erg Chech,
have been built up over thousands years into masses elongated roughly
parallel with the prevailing northeast winds. Dune chains in the
northern half of the view are 5-8 km apart. A slight change in
orientation and an increase in the density of dunes appears across the
middle of the view. Such changes usually relate to changes in sand
supply, and also to topographic scarps over which the dunes pass.
Obstacles like scarps and hills locally cause a leftward deflection (in
the northern hemisphere) in wind direction, an effect which can be seen
here in the dune orientation in the middle of the photo.
Dunes in the lower part of the view are 2-5 km apart. White patches are
small dry lakes at low points in the underlying rock surface. The strong
red color in some dunes near the edge of the dune field is iron staining
derived from sand particles blown into the dunes from the underlying
iron-rich soils. A dune free area appears in the lower left corner.
Linear dunes in the Algerian Saharan sand sea known as the Erg Chech,
have been built up over thousands years into masses elongated roughly
parallel with the prevailing northeast winds. Dune chains in the
northern half of the view are 5-8 km apart. A slight change in
orientation and an increase in the density of dunes appears across the
middle of the view. Such changes usually relate to changes in sand
supply, and also to topographic scarps over which the dunes pass.
Obstacles like scarps and hills locally cause a leftward deflection (in
the northern hemisphere) in wind direction, an effect which can be seen
here in the dune orientation in the middle of the photo.
Dunes in the lower part of the view are 2-5 km apart. White patches are
small dry lakes at low points in the underlying rock surface. The strong
red color in some dunes near the edge of the dune field is iron staining
derived from sand particles blown into the dunes from the underlying
iron-rich soils. A dune free area appears in the lower left corner.
