%0 Journal Article
%A Ronglin Tang
%A Zhao-Liang Li
%A Bohui Tang
%+ Institute of Geographic Sciences and Natural Resources Research, Beijing 100101, China;;LSIIT, Bld Sebastien Brant, BP10413, 67412 Illkirch, France;;Graduate University of Chinese Academy of Sciences, Beijing, 100049, China
%T An application of the T s –VI triangle method with enhanced edges determination for evapotranspiration estimation from MODIS data in arid and semi-arid regions: Implementation and validation
%J Remote Sensing of Environment
%D 2009
%N 3
%V 114
%K Evapotranspiration;MODIS;Validation;Large Aperture Scintillometer; T s –VI triangle space
%X Abstract(#br)The commonly applied surface temperature–vegetation index ( T s –VI) triangle method is used to estimate regional evapotranspiration (ET) in arid and semi-arid regions. A practical algorithm based on the T s –VI triangle method is developed to determine quantitatively the dry and wet edges of this triangle space. First, the T s –VI triangle method is reviewed. Assumptions involved in this method are highlighted, and advantages, disadvantages and applicability are discussed. Then, an experimental use of the T s –VI triangle method is developed and applied to several MODIS/TERRA datasets acquired during the Heihe Field Experiment from May 20th to August 21st, 2008. The sensible heat fluxes retrieved using MODIS data from a grassland located in the middle reach of Heihe river basin, Northwest China, are in good agreement with those measured from a Large Aperture Scintillometer (LAS). The Root Mean Square Error of this comparison is 25.07<ce:hsp sp="0.25"></ce:hsp>W/m 2 . It is shown that determination of dry and wet edges using the proposed algorithm is accurate enough at least in most cases of our study for the estimates of regional surface ET.
%@ 0034-4257
%W CNKI