STS026-40-13

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NASA Photo ID

STS026-40-13

Focal Length

100mm

Date taken

1988.10.02

Time taken

11:55:56 GMT

Resolutions offered for this image:
5700 x 5900 pixels 500 x 518 pixels 640 x 480 pixels

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Image Details
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Spacecraft nadir point: 14.2° N, 15.6° E

Photo center point: 13.5° N, 14.5° E

Photo center point by machine learning:

Nadir to Photo Center: Southwest

Spacecraft Altitude: 167 nautical miles (309km)

Country or Geographic Name:

CHAD

Features:

LAKE CHAD

Features Found Using Machine Learning:

Cloud Cover Percentage:

5 (1-10)%

Sun Elevation Angle:

65°

Sun Azimuth:

225°

Camera:

Hasselblad

Focal Length:

100mm

Camera Tilt:

25 degrees

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	5900 pixels	No	No	Download Image
500 pixels	518 pixels	No	No	Download Image
640 pixels	480 pixels	No	No	Download Image

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Image Caption: The fluctuating water levels of Lake Chad, (13.0N, 15.0E) at the intersection of the borders of Chad, Niger and Cameroon in the Sahara Desert, is an index of the drought in Africa. The lake level continues to decrease as indicated by the growing number and extent of emerging islands as previously submerged ancient sand dunes become visible. The water impounded between the dunes is probably because of local rainfall rather than a reversal of desertification.