ESA - Observing the Earth - Satellites guide aid workers sinking water wells for African refugees

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Satellites guide aid workers sinking water wells for African refugees

7 September 2004

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Sudanese refugee's gather outside their tents, Sunday, July 4, 2004, in the Koumouangou refugee camp in Chad near the Sudan border. An estimated 1 million Sudanese have been displaced during the conflict with Arab militias, with at least 200,000 fleeing into neighbouring Chad. Tents are from UNHCR (United Nations High Commission for Refugees).

Credits: AP Photo/Karel Prinsloo

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Underground water is not visible in optical imagery

Credits: UNHCR/UNOSAT/RTF 2004

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Underground water can be detected in radar imagery and water storage in alluvial deposits can be revealed down to 20 meters sub-surface.

Credits: UNHCR/UNOSAT/RTF 2004

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Map of satellite and DEM derived drainage network, watersheds, underground water reserves in wadis, dams and water storage and proposed locations for drilling new wells.

Credits: UNHCR/UNOSAT/RTF 2004