Spatial distribution of the air temperature in mountainous areas using satellite thermal infra-red data

被引:20
|
作者
Boudhar, Abdelghani [1 ]
Duchemin, Benoit [2 ]
Hanich, Lahoucine [1 ]
Boulet, Gilles [2 ]
Chehbouni, Abdelghani [2 ]
机构
[1] Fac Sci & Tech Marrakech, Marrakech, Morocco
[2] Univ Toulouse, CESBIO, CNRS, CNES,IRD, Toulouse 4, France
关键词
Air temperature; Landsat ETM; Snow-covered areas; Moroccan High-Atlas; SNOWMELT; CALIBRATION; MODIS; MODEL;
D O I
10.1016/j.crte.2010.11.004
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
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. (C) 2010 Academie des sciences. Published by Elsevier Masson SAS. All rights reserved.
引用
收藏
页码:32 / 42
页数:11
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