On the edge of the Kalahari Desert in Namibia, sand dunes are encroaching onto once-fertile
lands in the north. Healthy vegetation appears red in this image; in the center, notice the
lone red dot. It is the result of a center-pivot irrigation system, evidence that at least one
optimistic farmer continues to work the fields despite the approaching sand.
This image was acquired by
Landsat 7's Enhanced Thematic Mapper plus
(ETM+) sensor on August 14, 2000. This is a false-color composite image made using near
infrared, red, and green wavelengths. The image has also been sharpened using the sensor's