STS031-72-17
| NASA Photo ID | STS031-72-17 |
| Focal Length | 100mm |
| Date taken | 1990.04.25 |
| Time taken | 09:50:27 GMT |
Cloud masks available for this image:
Spacecraft nadir point: 14.0° N, 17.2° E
Photo center point: 13.5° N, 14.0° E
Photo center point by machine learning:
Photo center point: 13.5° N, 14.0° E
Photo center point by machine learning:
Nadir to Photo Center: West
Spacecraft Altitude: 332 nautical miles (615km)
Country or Geographic Name: | CHAD |
Features: | LAKE CHAD, MANIGA REGION |
| Features Found Using Machine Learning: | |
Cloud Cover Percentage: | 50 (26-50)% |
Sun Elevation Angle: | 75° |
Sun Azimuth: | 91° |
Camera: | Hasselblad |
Focal Length: | 100mm |
Camera Tilt: | 30 degrees |
Format: | 5017: Kodak, natural color positive, Ektachrome, X Professional, ASA 64, standard base |
Film Exposure: | Normal |
| Additional Information | |
| Width | Height | Annotated | Cropped | Purpose | 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: Africa's Lake Chad where the borders of Chad, Niger, Nigeria and Cameroon merge (13.0N, 14.0E) has been undergoing change for the past 25 to 30 years when it was first noticed that the lake is drying up. Since then, astronauts have been photographing it on a regular basis to record the diminishing lake bed. This lake was once the aproximate size of Lake Erie but is now only about half that size and is still receeding.
