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http://dx.doi.org/10.12652/Ksce.2010.30.3B.233

Estimation of Spatial Evapotranspiration Using satellite images and SEBAL Model  

Ha, Rim (건국대학교 사회환경시스템공학과)
Shin, Hyung-Jin (건국대학교 사회환경시스템공학과)
Lee, Mi-Seon (건국대학교 사회환경시스템공학과)
Kim, Seong-Joon (건국대학교 사회환경시스템공학과)
Publication Information
KSCE Journal of Civil and Environmental Engineering Research / v.30, no.3B, 2010 , pp. 233-242 More about this Journal
Abstract
SEBAL (Surface Energy Balance Algorithm for Land) developed by Bastiaanssen (1995) is an image-processing model comprisedof twenty-five sub models that calculates spatial evapotranspiration (ET) and other energy exchanges at the surface. SEBAL uses image data from Landsat or other satellites measuring thermal infrared radiation, visible and near infrared. In this study, the model was applied to Gyeongancheon watershed, the main tributary of Han river Basin. ET was computed on apixel-by-pixel basis from an energy balance using 4 years (2001-2004) Landsat and MODIS images. The scale effect between Landsat (30 m) and MODIS (1 km) was evaluated. The results both from Landsat and MODIS were compared with FAO Penman-Monteith ET. The absolute errors between satellite ETs and Penman-Monteith ET were within 12%. The spatial and temporal characteristics of ET distribution within the watershed were also analyzed.
Keywords
evapotranspiration; SEBAL; landsat; MODIS; FAO penman monteith;
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