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1 September 2011 Estimating Evapotranspiration using Improved Fractional Vegetation Cover and Land Surface Temperature Space
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Abstract

Vegetation index—land surface temperature (VITs) space has been widely used to estimate evapotranspiration and soil moisture. The limitation of this method is the uncertainty of the observed dry edge, which is usually fitted by scatter plots. Here, a method was used to locate true dry and wet edges based on energy balance formulation, and a simple method to estimate surface energy flux is proposed based on the improved Fractional vegetation cover—Land surface temperature (FvTs) space. Seventeen days of MODIS products were selected to estimate evapotranspiration and the estimated sensible heat flux (H) is compared with Large Aperture Scintillometer (LAS) data at a site in Zhengzhou. resulting in a RMSE of 44.06 W m-2, bias of 36.99 W m-2 and R2 of 0.71. The H scatter plots of estimation versus observation show clearly that most points are around the 1:1 line. Overall, the located true and wet edges are more accurate than the observed true edge. Our results can also be applied to improve the estimation of soil moisture.

Sun Liang, Sun Rui, Li Xiaowen, Chen Huailiang, and Zhang Xuefen "Estimating Evapotranspiration using Improved Fractional Vegetation Cover and Land Surface Temperature Space," Journal of Resources and Ecology 2(3), (1 September 2011). https://doi.org/10.3969/j.issn.1674-764x.2011.03.005
Received: 27 June 2011; Accepted: 1 August 2011; Published: 1 September 2011
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