NDLI: Determinación de la evapotranspiración en Cataluña mediante el uso de la teledetección y los sistemas de Información Geográfica

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Determinación de la evapotranspiración en Cataluña mediante el uso de la teledetección y los sistemas de Información Geográfica

Content Provider	Semantic Scholar
Author	Roselló, Jordi Cristóbal Casals, Miquel Ninyerola I
Copyright Year	2004
Abstract	Evapotranspiration monitoring has important implications on global and regional climate modelization, as well as in the hydrological cycle and to assess about environmental stress that affect forest and agricultural ecosystems. Nowadays, Remote Sensing and Geographical Information Systems (GIS) are the most important techniques allowing the scientific community to compute the actual evapotranspiration in a feasible way. In this study we present the preliminary results in daily actual evapotranspiration (ETd) at a regional scale (North-West of Spain) by means of eleven Landsat-7 ETM+ images and GIS tools during the 2002-2003 period. The result of this analysis consists on a set of ETd GIS layers having 60 meters of spatial resolution (total area of 3600 m) with an almost monthly temporal resolution. The methodology proposed by Seguin and Itier (1989) and Vidal and Perrier (1992) has been used, requiring three main variables to compute the ETd: land surface temperature, air temperature and net radiation. Land surface temperature has been obtained by means of the Landsat-7 ETM+ thermal band emissivity correction (Hurtado et al., 1996; Valor et al. 2000). Air temperature has been computed by multiple regression analysis and spatial interpolation from meteorological ground stations at satellite pass (Ninyerola et al., 2000). Net radiation has been calculated by means of the raditive balance. These preliminary results are very interesting due to the difficulty in obtaining forest and crop ETd data and to the high spatial and temporal resolution used, not usual in such combination.
Starting Page	375
Ending Page	386
Page Count	12
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://www.creaf.uab.es/miramon/publicat/papers/MCSIGT04/evapo.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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