Comparison of MODIS derived Evapotranspiration with las measurements at Changwu agro-ecological experimental station

Significance of Evapotranspiration (ET) has been realized in disciplines of hydrology, meteorology and agriculture from a number of studies. A parameterization based on the spatially contextual information of surface temperature-vegetation index, namely T_s-VI triangle method, is applied to estimate regional ET from remotely sensed data acquired at the Changwu agro-ecological experiment station. Surface net radiation (R_n) is estimated also from MODIS/Terra products. Ratio of soil heat flux (G) to R_n is determined using a linear combination of G/R_n at bare soil and fully vegetated surface. Reasonably good agreement between estimated and measured sensible heart flux from Large Aperture Scintillometer is observed with RMSD about 48 W/m².