Evapotranspiration monitoring with Meteosat Second Generation satellites: improvement opportunities from moderate spatial resolution satellites for vegetation
Earth and related Environmental sciences
PROBA-V, evapotranspiration, vegetation
Taylor & Francis
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The Satellite Application Facility on Land Surface Analysis proposes a land evapotranspira- tion product, generated in near real time. It is produced by an energy balance model forced by radiation components derived from data of the Spinning Enhanced Visible and Infrared Imager aboard Meteosat Second Generation geostationary satellites, at a spatial resolution of approximately 3 km at the equator and covering Europe, Africa and South America. We assess in the present paper the improvement opportunities from moderate spatial resolution satellites for evapotranspiration monitoring at Meteosat Second Generation satellite scale. Four variables, namely the land cover, the leaf area index, the surface albedo and the open water fraction, derived from moderate resolution satellite for vegetation monitoring are con- sidered at two spatial resolution, 1 km and 330 m, corresponding to the imagery provided by SPOT-Vegetation and future Project for Onboard Autonomy Vegetation (ProbaV) space- borne sensors. The variables are incorporated into the evapotranspiration model, replacing or complementing input derived from the sensor aboard the geostationary satellite, and their relative effect on the model output is analyzed. The investigated processes at small scales unresolved by the geostationary satellite are better taken into account in the final evapo- transpiration estimates, especially over heterogeneous and transition zones. Variables derived from sensors at 250-300 m are shown to have a noticeable effect on the evapotranspiration es- timates compared to the 1 km resolution, demonstrating the interest of ProbaV 330 m derived variables for the monitoring of evapotranspiration at Meteosat Second Generation resolution.
CitationGhilain, Nicolas; De Roo, Frederik; Gellens-Meulenberghs, Françoise (2014-03-27). Evapotranspiration monitoring with Meteosat Second Generation satellites: improvement opportunities from moderate spatial resolution satellites for vegetation. , International Journal of Remote Sensing, Vol. 35, Issue 7, 2654-2670, Taylor & Francis, DOI: 10.1080/01431161.2014.883093.