几何法确定区域似大地水准面及工程应用  

Confirming of Local Quasi-geoid with Geometry Method and Engineering Application

作　　者：张秀锦 ZHANG Xiujin(Geographic Information Center of Shandong Province,Ji'nan 250013,China)

机构地区：[1]山东省地理信息中心,山东济南250013

出　　处：《测绘与空间地理信息》2019年第2期211-213,共3页Geomatics & Spatial Information Technology

摘　　要：为了充分利用GPS观测数据中的高程信息,获得GPS观测点的正常高,本文利用EGM96全球重力场模型和某区域GPS/水准数据,采用移去-恢复技术以几何方法计算了该区域2.5'×2.5'分辨率似大地水准面模型,经过内、外精度的检验,似大地水准面模型的精度优于0.07 m。结合区域内某工程布设的E级GPS控制网数据进行正常高的计算,并和水准实测高程进行比较,结果表明几何法确定的小区域似大地水准面模型结合GPS观测信息可以代替低等级的水准测量,满足一般工程对高程测量的需求。In order to attain normal height from the high information of GPS survey data.In this paper,the 2.5′×2.5′distinguish rate local quasi-geoid model has been constructed with remove-restore method by geometry method,using EGM96 gravity field models and GPS/Leveling data.The inner and outer accuracy of quasi-geoid model are all excelled than 0.070 m.The quasi-geoid model and E-grade GPS control-net in this region are used to calculate normal height and compared with leveling height.The result shows that the quasi-geoid model and the high information of GPS survey data can instead of low-grade Leveling and meet the need of commonly survey.

关 键 词：似大地水准面 高程异常 正常高 GPS/水准 

分 类 号：P223.0[天文地球—大地测量学与测量工程]