Météorologie solaire et images satellitaires : cartographie du rayonnement solaire, détermination de l'albédo des sols et évaluation de l'ennuagement

Abstract : The solar radiation has biological, physiological, climatic, economical, political, social, cultural repercussions. The study of the solar energy available at ground over ali the Earth especially requires the use of remote sensing data. To evaluate and quantify the solar effects from space, it is necessary to design elaborated image processing methods. ln our study, we analyse each state of the treatment of Meteosat images, used in the solar energy evaluation. First of ali, we present results of the cartography of daily global solar radiation in West Africa. These results are achieved by an operational method developed in the Centre de Télédétection et d'Analyse des Milieux Naturels (CTAMN) of Ecole des Mines de Paris: the HELlOSAT project. The comparison of our results and the ground measurements has allowed to validate this method and to have faith in its operational future. But, improvements are necessary. Thus, we have worked on relative position of the sun, to obtain images of relative reflectance (relative albedo). We have developed a method to compute an image of ground reflectance using another composite image without cloud or shadow. It requires the estimation of a cloud index at each image point. We have recommended, at this stage, the choice of a cloud index sensitive to cloud transparency.
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Dominique Obrecht. Météorologie solaire et images satellitaires : cartographie du rayonnement solaire, détermination de l'albédo des sols et évaluation de l'ennuagement. Océan, Atmosphère. Université de Nice Sophia-Antipolis, 1990. Français. ⟨pastel-00957267⟩

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