EGM2008求解高程异常在新疆地区的精度分析

摘要

根据分布于新疆全区13个地州、38个测区的998组GPS水准数据,计算得出EGM2008模型在新疆地区的总体精度为0.146 m,其中平原区为0.063 m,山区为0.117 m,沙漠区为0.205 m,高山区为0.217m.分析了EGM2008模型高程异常精度的分布规律及其随距离的变化情况,进而提出在一定范围内利用EGM2008模型对GPS大地高进行转换可以代替四等以下水准测量的观点及其适用范围和注意事项.%Based on the analysis of 998 groups of leveling data in 38 survey fields,distributed in 13 administrative divisions throughout Xinjiang,we come to the conclusion that the overall precision EGM2008 in Xinjiang is 0.146 m.We summarize the distribution regularities of height anomaly precision and changes varying with distance of EGM 2008,and propose that,within a certain scope,the EGM 2008 transformation results of GPS ellipsoidal height can replace fourth and lower grade leveling.