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IdentificationMission: AS07 Roll: 8 Frame: 1932 Mission ID on the Film or image: AS7
Country or Geographic Name: CHAD
Features: LAKE CHAD, WINDOW OBSTRUCTION
Center Point Latitude: 13.5 Center Point Longitude: 14.5 (Negative numbers indicate south for latitude and west for longitude)
Stereo: No (Yes indicates there is an adjacent picture of the same area)
ONC Map ID: JNC Map ID:
Camera Focal Length: 80mm
Camera: HB: Hasselblad
Film: SO121 : Kodak Ektachrome 64.
QualityFilm Exposure: Normal
Percentage of Cloud Cover: 20 (11-25)
NadirGMT Date: 196810__ (YYYYMMDD) GMT Time: (HHMMSS)
Nadir Point Latitude: , Longitude: (Negative numbers indicate south for latitude and west for longitude)
Nadir to Photo Center Direction:
Sun Azimuth: (Clockwise angle in degrees from north to the sun measured at the nadir point)
Spacecraft Altitude: nautical miles (0 km)
Sun Elevation Angle: (Angle in degrees between the horizon and the sun, measured at the nadir point)
CaptionsAS07-8-1932 Lake Chad, Africa October 1968
The north and south basins of Lake Chad are visible in this southeast-looking, high-oblique photograph. The boundaries and depth of the lake fluctuate from season to season and year to year. Lake Chad is the 4th largest lake in Africa and the 17th largest lake in the world, covering an area of nearly 6000 square miles (16 000 square kilometers). The average depth of the lake in the north is only 10 feet (3 meters), whereas the average depth in the south is nearly 20 feet (6 meters). The lake is fed by two major rivers, the Chari and the Komadugu Gana, and by many lesser streams; but, it has no outlet. Lake Chad is a freshwater lake, which is very unusual for a desert lake. During periods of adequate rainfall, runoff accumulates in the basin, filling Lake Chad and permitting extensive agriculture and local fishing. Located on the southern boundary of the Sahara Desert, Lake Chad contains numerous sand dunes or islets in both its northern and its southern basin. Two million years ago, when the climate was much wetter, Lake Chad covered a large portion of the south-central Sahara Desert. As the climate became drier and some geologic uplifting occurred to the south of the lake, sending rivers that had been draining into the lake southward into the Congo Basin, the lake shrank to little more than 10 percent of its original size. Lake Chad continues to shrink because of droughts that plague that region of Africa. The northern basin, which is almost completely cut off from the southern basin by a ridge known as the Great Barrier, is especially vulnerable to any short-term changes resulting from drought conditions and excessive evaporation. The position of Lake Chad and the sensitivity of the lake to changes in regional rainfall make the site an ideal focus for drought impact studies using satellite data and astronaut photography.
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