粤港澳陆海统一似大地水准面模型构建与分析

Construction and Analysis of Guangdong-Hong Kong-Macao Land and Sea Unified Quasi-Geoid Model

采用75251个重力点数据和221个GNSS水准资料,以SGG-UGM-2地球重力场模型作为参考重力场,由Stokes-Helmert凝集法计算了2′2′格网粤港澳似大地水准面模型(模型2021),实现了陆海一体、覆盖粤港澳全域的高程基准统一。经精度检验及新旧模型差异分析,模型2021有效覆盖粤港澳全域及领海基线内海域,外符合精度从原有的±4.8 cm提升到±2.9 cm,其中,粤港澳大湾区模型精度达到了±1.8 cm,粤北山区、粤东沿海区域精度显著提升。

Using 75251 gravity point data and 221 GNSS leveling data,taking the SGG-UGM-2 earth gravity field model as the reference gravity field,the Stokes-Helmert approach is conducted to construct the 2′2′resolution Guangdong-Hong Kong-Macao GNSS Gravity Quasi-Geoid Model(model 2021),realizing the unification of elevation datum that integrates land and sea,and covers the whole region of Guangdong-Hong Kong-Macao.According to the precision test and the difference analysis between the old and new models,model 2021 effectively covers the whole area of Guangdong-Hong Kong-Macao and sea area within territorial baselines,and its outer precision is promoted from±4.8 cm to±2.9 cm,GBA is±1.8 cm,and the error of the model 2021 in north mountain and east coastal sea area are significantly reduced.