区域似大地水准面精化在地籍测量中的应用分析

摘要

区域似大地水准面精化的主要作用之一是在对一定比例尺的地形绘图时，用GPS测量代替传统的三角高程测量和水准测量。这种测量将GPS的优势充分发挥出来，减少了很多外部工作量，大幅度降低了作业成本。但是目前在区域似大地水准面净化中，大都应用大量的重力资料、GPS水准数据以及数字地形模型，并且相关行业内进行数据采集和处理的过程非常复杂，对于一些技术和经济实力一般的企业，这些几乎无法实现，而且很多测区缺少相应的地面重力数据和可用的数字地形模型，因此该方法的使用受到了限制。本文将引进EGM2008地球重力模型，并且在详尽分析此模型精度尤其是在大陆地区精度的基础上，对某些地区进行实地地籍测量。%The main purpose to determine the high -precision regional quasi -geoid is to utilize GPS to instead of trigonometric and direct leveling , it can take full advantage of GPS measurement and reduce the surveying worked load .Accordingly ,the cost of produc-tion can also be reduced .At present , the great quantity of gravity data , high-precision GPS/leveling data and digital terrain model is used to in the high-precision regional quasi -geoid.Within the industry , the data processing and computing is too complex to afford for the institution with ordinary technical and economical strength , moreover many areas lack of ground gravity data as well as high -precision and high-resolution on digital terrain model .Therefore , the application of this method is limited by a certain extent .Ai-ming the problem mentioned above , the EGM2008 earth’s gravity field model is introduced in the thesis , and the accuracy of the mod-el is analyzed in detail , especially the accuracy in Mainland China .