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This paper presents approaches we developped for the spatial and temporal monitoring of evapotranspiration and irrigation of cereals in semi-arid regions surrounding the Mediterranean basin. The test site cover a 3 x 3 km² in the plain of Marrakech (Morocco) where wheat crops is dominant. Two methodologies of coupling evapotranspiration models and remote sensing data were compared. They result in estimate of plant maximal transpiration and water requirements to crop cycles observed by time-series of satellite data. Two approaches were tested using eight high spatial resolution images acquired by HRVIR sensor onboard SPOT satellite during one agricultural season. The spatialisation method outlines the spatiotemporal patterns of crop development. The associated maps of seasonal evapotranspiration appear consistent with rainfall and irrigation features. These maps can provide with a suitable overview of plant water consumption as well as deficit in supply of irrigation water. The drawbacks and advantages of each approach are finally discussed, as well as the perspectives on improvements and validation of these first result.
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This paper presents approaches we developped for the spatial and temporal monitoring of evapotranspiration and irrigation of cereals in semi-arid regions surrounding the Mediterranean basin. The test site cover a 3 x 3 km² in the plain of Marrakech (Morocco) where wheat crops is dominant. Two methodologies of coupling evapotranspiration models and remote sensing data were compared. They result in estimate of plant maximal transpiration and water requirements to crop cycles observed by time-series of satellite data. Two approaches were tested using eight high spatial resolution images acquired by HRVIR sensor onboard SPOT satellite during one agricultural season. The spatialisation method outlines the spatiotemporal patterns of crop development. The associated maps of seasonal evapotranspiration appear consistent with rainfall and irrigation features. These maps can provide with a suitable overview of plant water consumption as well as deficit in supply of irrigation water. The drawbacks and advantages of each approach are finally discussed, as well as the perspectives on improvements and validation of these first result.
* Document PDF/PDF document (0,4 Mo)