基于城市似大地水准面的高程测量精度分析  

Accuracy Analysis of Elevation Measurement Based on Urban Quasi Geoid

作　　者：刘勇[1] LIU Yong(Zhejiang Tongji Vocational College of Science and Technology,Hangzhou 311231,China)

机构地区：[1]浙江同济科技职业学院,浙江杭州311231

出　　处：《城市勘测》2024年第6期132-135,145,共5页Urban Geotechnical Investigation & Surveying

基　　金：浙江省中华职业教育科研项目(ZJCV2022A42)。

摘　　要：为了提高GNSS测量的高程精度,提出一种同时顾及测量误差和模型误差的分区再次拟合方法。依托某市新型基础测绘项目的控制测量数据,在分析两类高差数据精度、可靠性基础上,基于模型精度分布不均匀、不同环境下GNSS信号质量强弱有别,按地貌特征进行分区,对高差不符值较大区域进行精化高与水准高二次拟合,重新解算局部控制点的高程,综合评定了拟合高程精度,结果显示达到了相关规范的技术指标。In order to improve the elevation accuracy of GNSS measurement,a partition refitting method is proposed that takes into account both measurement error and model error.Based on the control measurement data of a new type of basic surveying and mapping project in a certain city,the accuracy and reliability of two types of height difference data were analyzed.Based on the uneven distribution of model accuracy and the different strengths and weaknesses of GNSS signal quality in different environments,zoning was carried out according to geomorphic characteristics.Areas with large height difference discrepancies were refined and fitted with high and level height twice,and the elevation of local control points was recalculated.The fitting elevation accuracy was comprehensively evaluated,the results show that the technical specifications have been met.

关 键 词：高程异常 模型精度 高程检测 拟合残差 精度评定 

分 类 号：P224[天文地球—大地测量学与测量工程]