Smart Distance Searching-based and DEM-informed Interpolation of Surface Air Temperature in China
Received date: 2003-08-07
Revised date: 2003-10-12
Online published: 2004-05-25
Supported by
National Natural Science Foundation of China, No.40371001; National High Technology Research and Development Program of China, No.2003AA131080
Statistical interpolation of the temperature for the missing points is one of the most popular approaches for generating high spatial resolution data sets. However, many interpolation methods used by previous studies are purely mathematic ways, without geographical significance being considered. In the present study the authors interpolate the monthly and annual mean temperature climatologies using 726-station observations in China, utilizing improved methods by taking into account geographical factors such as latitude, longitude, altitude. In addition, a smart distance-searching technique is adopted, which helps select the optimum stations on which the guess values at missing points are generated. Results show that the methods used here have evident advantages over the previous approaches. The mean absolute err of ordinary inverse-distance-squared (IDS) technique is in the range of 1.44-1.63oC, on average 1.51oC. The smart distance searching technique yield a MAE of 0.53-0.92oC, on average 0.69oC. Errors have been reduced as much as 50%.
Key words： temperature; spatial interpolation; smart distance-searching method; DEM; China
PAN Yaozhong, GONG Daoyi, DENG Lei, LI Jing, GAO Jing . Smart Distance Searching-based and DEM-informed Interpolation of Surface Air Temperature in China[J]. Acta Geographica Sinica, 2004 , 59(3) : 366 -374 . DOI: 10.11821/xb200403006
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