Accuracy Analysis of Elevation Measurement Based on Urban Quasi Geoid
In order to improve the elevation accuracy of GNSS measurement,a partition refitting method is proposed that takes into ac-count 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 geo-morphic characteristics.Areas with large height difference discrepancies were refined and fitted with high and level height twice,and the ele-vation of local control points was recalculated.The fitting elevation accuracy was comprehensively evaluated,the results show that the technical specifications have been met.
万方数据
维普
