广州似大地水准面的精化  

作　　者：袁国辉 

机构地区：[1]广州市房地产测绘所,广东广州510030

出　　处：《工程勘察》2008年第S1期323-328,共6页Geotechnical Investigation & Surveying

摘　　要：本文首先阐述了区域精化似大地水准面的必要性和重要性,然后以广州地区似大地水准面的精化项目为背景,详细介绍了数据的采集,重力模型选取以及似大地水准面精化的方法和过程,并通过对1km、2km两种格网分别采用四套水准点拟合方案进行了精度分析和评定,结果表明广州似大地水准面的精化达到了三、四等水准测量的精度要求,可满足广州市大比例尺地形图修补、测图一体化和施工放样等工程建设的需要。This paper firstly discusses the necessity and importance of Quasi-geoid Improvement. Subsequently, basing on the project of Guangzhou Quasi-geoid Improvement, we introduce the following parts including dada collection, choosing gravitational model, method of quasi-geoid improvement and data processing. Lastly, Comparing with the four level fitting schemes in 1km and 2km grid resolution, the result indicates that Guangzhou Quasi-geoid Improvement achieves the accuracy of the third and fourth leveling and totally meets the engineering construction such as fixing the large scale relief maps, plotting integration and setting out in Guangzhou.

关 键 词：似大地水准面 EGM96 GPS水准 

分 类 号：P224.1[天文地球—大地测量学与测量工程]