NWIPB OpenIR
Effect of spatial variation on areal evapotranspiration simulation in Haibei, Tibet plateau, China
Li, Zhengquan; Yu, Guirui; Li, Qingkang; Fu, Yuling; Li, Yingnian
2006-08-20
发表期刊INTERNATIONAL JOURNAL OF REMOTE SENSING
卷号27期号:16页码:3487-3498
文章类型Article
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.; 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.
关键词Regional-scale Heat-flux
WOS标题词Science & Technology ; Technology
学科领域生物科学
关键词[WOS]REGIONAL-SCALE ; HEAT-FLUX
收录类别SCI
语种英语
WOS研究方向Remote Sensing ; Imaging Science & Photographic Technology
WOS类目Remote Sensing ; Imaging Science & Photographic Technology
WOS记录号WOS:000239535000010
引用统计
被引频次:5[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://210.75.249.4/handle/363003/1324
专题中国科学院西北高原生物研究所
作者单位1.CAS, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China
2.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China
3.CAS, NW Inst Plateau Biol, Xining 810001, Peoples R China
推荐引用方式
GB/T 7714
Li, Zhengquan,Yu, Guirui,Li, Qingkang,et al. Effect of spatial variation on areal evapotranspiration simulation in Haibei, Tibet plateau, China[J]. INTERNATIONAL JOURNAL OF REMOTE SENSING,2006,27(16):3487-3498.
APA Li, Zhengquan,Yu, Guirui,Li, Qingkang,Fu, Yuling,&Li, Yingnian.(2006).Effect of spatial variation on areal evapotranspiration simulation in Haibei, Tibet plateau, China.INTERNATIONAL JOURNAL OF REMOTE SENSING,27(16),3487-3498.
MLA Li, Zhengquan,et al."Effect of spatial variation on areal evapotranspiration simulation in Haibei, Tibet plateau, China".INTERNATIONAL JOURNAL OF REMOTE SENSING 27.16(2006):3487-3498.
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