Towards a Rainfall Estimation Using Meteosat Over Africa

by Yves Arnaud, ORSTOM BP, Montpellier, France,
Michel Desbois, ORSTOM BP, Montpellier, France,
Alain Gioda, ORSTOM BP, Montpellier, France,



Document Type: Proceeding Paper

Part of: Hydraulics/Hydrology of Arid Lands (H?AL)

Abstract:

The scope of the research is to develop a method of rainfall estimation at both small space and time scales (9 pixels -225 km²-, and single shower duration - several hours-) using Thermal Infra-Red Meteosat data. The method is based on the cloud-top radiometry. The study area is located between 13?-14?N and 2? -3?E (Niamey area). A dense recording raingauge network implanted in Niger provides the data to calibrate satellite estimations. A relationship was found to link the maximum digital count to the squall line rainfall amount. The use of area average rainfall estimates increases the relationship's reliability.

Subject Headings: Rainfall | Hydrologic data | Rainfall duration | Thermal effects | Sensors and sensing | Satellites | Developing countries | Africa | Niger

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