基于多种方法构建似大地水准面模型推估特性分析  

The analysis of extrapolated capability of quasi-geoid based on muti-methods

作　　者：蒋光伟[1] 郭春喜[1] 田晓静[1] 王斌[1] 王文利[1] 聂建亮[1] 

机构地区：[1]国家测绘地理信息局大地测量数据处理中心,西安710054

出　　处：《地球物理学进展》2014年第1期51-56,共6页Progress in Geophysics

基　　金：国家863项目(2009AA121402-5);陕测科(2009-03)联合资助

摘　　要：针对构建似大地水准面中采用的重力水准法、EGM2008水准法、GPS水准法,结合地形复杂程度、面积大小、重力似大地水准面分辨率与精度等特点,首次评价了基于多种方法构建的似大地水准面模型的外推性与真实性.采用地形复杂区域S、平原区域N以及沿海区域Q构建区域似大地水准面模型.通过时各方法得到的似大地水准面模型推估特性分析比较,结果表明:就反应似大地水准面起伏的真实情况而言,重力水准法精度最高且外推能力最强;EGM2008水准法精度次之,外推能力较强外推范围在10 km左右;GPS水准法精度最弱,外推能力最差.构建高精度高分率1 cm级似大地水准面时须采用基于grave/level法.We use the grave/level, EGM2008/level, GPS/level to construct the regional Quasi-Geoid, which have the complex terrain, area, the various resolutions and accuracy of gravity Quasi-Geoid, evaluate extrapolated capability by using complexed terrain region S, plain region N and littoral Q. Analysis the extrapolated capability by the statistical comparison, the results indicated that： as for the Quasi-Geoid＇ s authenticity, based on the grave/level＇s Quasi-Geoid accuracy and extrapolated capability are most highest and strongest; based on the EGM2008/level quasi-Geoid＇ s accuaracy is secondary, the extrapolated capability more stronger and the extrapolated range is about 10km; based on the GPS/level Quasi-Geoid＇s accuaracy is least weak and deficiency in extrapolation. To construct the lcm Quasi-Geoid that should use the grave/level method.

关 键 词：似大地水准面 重力水准 EGM2008 GPS水准 

分 类 号：P223[天文地球—大地测量学与测量工程]