< STS045-618-13 >

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NASA Photo ID

STS045-618-13

Focal Length

250mm

Date taken

1992.03.30

Time taken

16:05:00 GMT

Resolutions offered for this image:
5700 x 6000 pixels 500 x 526 pixels 640 x 480 pixels

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Image Details
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Spacecraft nadir point: 11.7° S, 10.4° E

Photo center point: 16.5° S, 12.0° E

Photo center point by machine learning:

Nadir to Photo Center: South

Spacecraft Altitude: 160 nautical miles (296km)

Country or Geographic Name:

ANGOLA

Features:

MOCAMEDES DES., COAST

Features Found Using Machine Learning:

Cloud Cover Percentage:

0 (no clouds present)

Sun Elevation Angle:

18°

Sun Azimuth:

278°

Camera:

Rolleiflex

Focal Length:

250mm

Camera Tilt:

Low Oblique

Format:

5017: Kodak, natural color positive, Ektachrome, X Professional, ASA 64, standard base

Film Exposure:

Normal

Additional Information

Width	Height	Annotated	Cropped	Links
5700 pixels	6000 pixels	No	No	Download Image
500 pixels	526 pixels	No	No	Download Image
640 pixels	480 pixels	No	No	Download Image

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Image Caption:
STS045-618-013 and STS045-618-016: Namib Desert Dune Patterns
STS045-618-013: Namib Desert coastal dunes, southern Angola.
The trend of the dunes in the sand sea show a great clockwise
"wheelround." A similar pattern of dune trends occurs further
south in Namibia (STS045-618-016), south of the Cunene River (the
border between Namibia and Angola). Friction caused when south-
erly winds blow off the ocean over relatively rougher landsur-
faces are deflected rightwards in the southern hemisphere. De-
flection of winds up major river valleys may also help explain
this striking pattern.