Spatial distribution of snow depth based on geographically weighted regression kriging in the Bayanbulak Basin of the Tianshan Mountains, China
Spatial distribution of snow depth based on geographically weighted regression kriging in the Bayanbulak Basin of the Tianshan Mountains, China
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DOI：
10.1007/s11629-017-4564-z
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发表时间：
2018-01
影响因子：
2.5
通讯作者：
Yang Liu;Lan-hai Li;Xi Chen;Jinming Yang;Jian-sheng Hao
中科院分区：
文献类型：
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作者：
Yang Liu;Lan-hai Li;Xi Chen;Jinming Yang;Jian-sheng Hao
在许多农业、水文、气候和生态模型中，雪深是一个普遍的输入变量。利用雪深观测数据和解释变量，比较了地理加权回归克里金法(GWRK)和回归克里金法(RK)在区域雪深空间内插中的精度和效果。使用相关系数和方差膨胀因子(VIF)对辅助变量进行分析。以高度、地形崎岖指数(TRI)和地表温度(LST)三个变量为解释变量，建立了积雪深度回归模型。给出了天山天山巴彦布拉克盆地积雪深度的空间分布，空间分辨率为1 km。结果表明：1)GWRK的精度略高于RK(R2=0.55vs.R2=0.5，均方根误差=0.102 m vs.RMSE=0.077 m)；2)对于分区，GWRK和RK具有相似的积雪深度估计结果。巴彦布拉克盆地积雪深度大于0.15m的地区主要分布在海拔2632.00~3269.00 m的范围内，积雪占盆地积雪总量的45.00~46.00%。然而，GWRK比RK提供了更详细的积雪深度分布信息。最后得出结论：GWRK更适合于区域积雪深度分布的估算。
Snow depth is a general input variable in many models of agriculture, hydrology, climate and ecology. This study makes use of observational data of snow depth and explanatory variables to compare the accuracy and effect of geographically weighted regression kriging (GWRK) and regression kriging (RK) in a spatial interpolation of regional snow depth. The auxiliary variables are analyzed using correlation coefficients and the variance inflation factor (VIF). Three variables, Height, topographic ruggedness index (TRI), and land surface temperature (LST), are used as explanatory variables to establish a regression model for snow depth. The estimated spatial distribution of snow depth in the Bayanbulak Basin of the Tianshan Mountains in China with a spatial resolution of 1 km is obtained. The results indicate that 1) the result of GWRK’s accuracy is slightly higher than that of RK (R2= 0.55 vs.R2= 0.50, RMSE (root mean square error) = 0.102 m vs. RMSE = 0.077 m); 2) for the subareas, GWRK and RK exhibit similar estimation results of snow depth. Areas in the Bayanbulak Basin with a snow depth greater than 0.15 m are mainly distributed in an elevation range of 2632.00–3269.00 m and the snow in this area comprises 45.00–46.00% of the total amount of snow in this basin. However, the GWRK resulted in more detailed information on snow depth distribution than the RK. The final conclusion is that GWRK is better suited for estimating regional snow depth distribution.