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Analysis on some problems about moving interpolation method in GPS-leveling

LIU Chang-jian,CHAI Hong-zhou,WU Hong-ju,MA Gao-feng(Institute of Surveying and Mapping,Information Engineering University,Zhengzhou 450052,China)  
Some problems,such as the difference between interpolation accuracy and extrapolation accuracy,accuracy estimating of translated normal height,evaluating on height class of GPS-Leveling and so on,are discussed.By use of a set of GPS-Leveling data,moving weighted average and moving polynomial function and corresponding methods with earth gravity model are compared.At the end,advice for how to choose the best moving method is given.
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