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Comparing the optical and the radar images of the area around Iridimi refugee camp in Chad illustrates the potential.
The photograph shows the wadi, or dry river bed, on the left of the picture, with red dots showing dry wells and blue dots the productive wells.
Red lines are the fractures, which could hold water.
There is no real way of knowing why some wells provide water while others are dry. But the radar image is clear.
The black areas are dry, while the bright areas have the potential to hold water.
The three red dots, indicating dry wells are in the black and therefore dry area, while the blue dots are on the bright areas or on a fracture.