An approach for combining remote sensing spectral measurements with an ecosystem model was presented in an accompanying article. The sahelian grassland ecosystem STEP model developed for that purpose was also described and validated. In order to fulfill a prerequisite for using coarse resolution ...
Seen, D. lo
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Mougin, E.
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Rambal, S.
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Gaston, A.
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Hiernaux, Pierre H.Y.
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[A regional sahelian grassland model to be coupled with multispectral satellite data. II. Toward the control of its simulations by remotely sensed indices]
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A regional sahelian grassland model to be coupled with multispectral satellite data. II. Toward the control of its simulations by remotely sensed indices
Crop growth on acid sandy soils of the Sudano-Sahelian zone is primarily limited by the low amounts of organic matter and available mineral nutrients in the topsoil. The shortening of fallow periods with population growth, the exploitation of fire wood, spatial nutrient transfers by wind and wate...
Buerkert, Andreas
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Hiernaux, Pierre H.Y.
,
[Nutrients in the West African Sudano-Sahelian zone: Losses, transfers and role of external inputs]
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Nutrients in the West African Sudano-Sahelian zone: Losses, transfers and role of external inputs
The West African Sahel rainfall regime is known for its spatio-temporal variability at different scales which has a strong impact on vegetation development. This study presents results of the combined use of a simple water balance model, a radiative transfer model and ERS scatterometer data to ...
Jarlan, L.
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Mazzega, P.
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Mougin, E.
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Lavenu, F.
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Marty, G.
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Frison, P.L.
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Hiernaux, Pierre H.Y.
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[Mapping of Sahelian vegetation parameters from ERS scatterometer data with an evolution strategies algorithm]
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Mapping of Sahelian vegetation parameters from ERS scatterometer data with an evolution strategies algorithm
This article presents an analysis of ERS-1 wind-scatterometer (WSC) data acquired over a region located in the northern Sahel. The considered period extends from January 1992 to December 1995, that is, covering four vegetation cycles. Experimental observations show that WSC responses at 45° of i...
Frison, P.L.
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Mougin, E.
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Hiernaux, Pierre H.Y.
,
[Observations and interpretation of seasonal ERS-1 wind scatterometer data over northern Sahel (Mali)]
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Observations and interpretation of seasonal ERS-1 wind scatterometer data over northern Sahel (Mali)
Certain landscapes in the Sahel and elsewhere consist of a 'checkerboard' arrangement of vegetated and non-vegetated areas in which there may be several spectrally distinct vegetation and bare ground components. When individual components form large spatially coherent patches, and the vertical di...
Hanan, N.P.
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Prince, S.D.
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Hiernaux, Pierre H.Y.
,
[Spectral modelling of multicomponent landscapes in the Sahel]
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Spectral modelling of multicomponent landscapes in the Sahel