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	Effect of spatial variation on areal evapotranspiration simulation in Haibei, Tibet plateau, China
	Li Z. Q. ; Yu G. R. ; Li Q. K. ; Fu Y. L. ; Li Y. N.
	2006
关键词	regional-scale heat-flux
英文摘要	Quantification of areal evapotranspiration from remote sensing data requires the determination of surface energy balance components with support of field observations. Much attention should be given to spatial resolution sensitivity to the physics of surface heterogeneity. Using the Priestley-Taylor model, we generated evapotranspiration maps at several spatial resolutions for a heterogeneous area at Haibei, and validated the evapotranspiration maps with the flux tower data. The results suggested that the mean values for all evapotranspiration maps were quite similar but their standard deviations decreased with the coarsening of spatial resolution. When the resolution transcended about 480 m, the standard deviations drastically decreased, indicating a loss of spatial structure information of the original resolution evapotranspiration map. The absolute values of relative errors of the points for evapotranspiration maps showed a fluctuant trend as spatial resolution of input parameter data layers coarsening, and the absolute value of relative errors reached minimum when pixel size of map matched up to measuring scale of eddy covariance system. Finally, based on the analyses of the semi-variogram of the original resolution evapotranspiration map and the shapes of spatial autocorrelation indices of Moran and Geary for evapotranspiration maps at different resolutions, an appropriate resolution was suggested for the areal evapotranspiration simulation in this study area.
出处	International Journal of Remote Sensing
卷	27
期	16
页	3487-3498
收录类别	SCI
语种	英语
ISSN号	0143-1161
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/23569]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Li Z. Q.,Yu G. R.,Li Q. K.,et al. Effect of spatial variation on areal evapotranspiration simulation in Haibei, Tibet plateau, China. 2006.

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