Boudhar A., Duchemin Benoît, Hanich L., Boulet Gilles, Chehbouni Abdelghani. (2011). Spatial distribution of the air temperature in mountainous areas using satellite thermal infra-red data. Comptes Rendus Geoscience, 343 (1), p. 32-42. ISSN 1631-0713.
Titre du document
Spatial distribution of the air temperature in mountainous areas using satellite thermal infra-red data
Année de publication
Boudhar A., Duchemin Benoît, Hanich L., Boulet Gilles, Chehbouni Abdelghani
Comptes Rendus Geoscience, 2011,
343 (1), p. 32-42 ISSN 1631-0713
Understanding the spatial distribution of air temperature in mountainous areas is essential in hydrological modelling. In the Moroccan High-Atlas range, the meteorological stations network is sparse. In order to get additional information, we investigated the thermal infrared data supplied by the Enhanced Thematic Mapper (ETM +) sensor onboard the Landsat 7 satellite. The brightness temperature derived from ETM+ images is used as a proxy for air temperature to set up a model that describes its spatial distribution. This model accounts for sun location and topographic characteristics derived from the SRTM digital elevation model. It was evaluated on the Rheraya watershed, a 225-km(2) region located within the semi-arid High-Atlas mountain range, using two different sources of data. The first data set consists in in-situ air temperature collected by meteorological stations installed during the experiment at various altitudes from 1400 to 3200 m. The second data set is satellite estimates of snow-covered areas (SCA) derived from MODIS images over the whole catchment at 500 m spatial resolution.
Plan de classement
Sciences du milieu