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31 January 1995 Estimation of radiation budget and water balance with satellite data for savanna monitoring
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Abstract
This paper presents a functional characterization of West Africa's ecological systems using satellite data. It shows the capability of spatio-temporal determination of the hydrological budget well fitted to the chlorophyllian phenology. The method includes two parts: estimation of radiation budget at the earth surface, and actual evapotranspiration and, in addition, estimation of one hydrological budget and its capability to describe and possibly to predict growth process. The estimation of evaportranspiration is made with simplified relationships proposed by Jackson and Seguin. These descriptions need a limited number of input data, and their parametrization can be deduced from the main classes of vegetation. A hydrological budget model is then established using evapotranspiration, rainfall measurement, and the estimation of ground contribution at a suitable scale. In this model, we assume that the phenological state of the plant at a given time depends on the efficient stock of water during the months preceding the state development. The results show that the concept of the estimation of radiation budget at the earth surface and actual evapotranspiration can be applied generally for large areas at fine spatial resolution and the model of efficient water shows a good adjustment with the cycle normalized difference vegetation index.
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Olivier Amram, Guy Flouzat, and S. Cherchali "Estimation of radiation budget and water balance with satellite data for savanna monitoring", Proc. SPIE 2314, Multispectral and Microwave Sensing of Forestry, Hydrology, and Natural Resources, (31 January 1995); https://doi.org/10.1117/12.200756
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