GDCORS和粤港澳大湾区似大地水准面在验潮站水准点高程测定中的应用

Application of GDCORS and the quasi-geoid in the Guangdong-Hong Kong-Macao Greater Bay Area in leveling elevation determination of tide stations

基于广东省陆海一体现代测绘基准体系建设成果,以江门市沿海的5个验潮站水准点作为试验点,同时在试验点周边选取4个高程控制点作为检核点,分别从高程和高差两个方面进行全球导航卫星系统(GNSS)静态高程测量替代国家三等、四等水准测量的误差对比分析,探究GNSS静态高程测量在不同观测时长下的精度情况。试验结果表明,在结合广东省连续运行卫星定位服务系统(GDCORS)和粤港澳大湾区高精度似大地水准面模型的情况下,对沿海地区验潮站水准点进行2和4 h以上的GNSS静态高程测量分别可以达到国家四等和三等水准测量的精度要求,此试验为其在广东省海洋测绘领域应用提供了价值参考。

Based on the construction achievements of modern surveying and mapping reference system integrating land and sea in Guangdong Province,and five tide station levelling points along the coast of Jiangmen were taken as test points,and four elevation control points around the test points were selected as check points.The error comparison and analysis of global navigation satellite system(GNSS)static elevation survey replacing national third-class and fourth-class levelling survey were carried out from two aspects of elevation and elevation difference,respectively.To explore the accuracy of GNSS static elevation measurement under different observation durations.The experimental results showed that,in combination with Guangdong province's continuously operating reference stations(GDCORS)and the high precision geoid model of Guangdong-Hong Kong and Macao Greater Bay Area,the GNSS static elevation measurement of the leveling points in coastal areas for 2 h could meet the accuracy requirements of the national fourth-class leveling,and then could meet the accuracy requirements of the national third-class leveling for more than 4 h.This experiment provided a good reference for marine surveying and mapping in Guangdong province.