Applicability analysis of regional quasi-geoid model in land area of China for digitizing mapping
The low order leveling can be replaced by global navigation satellite system(GNSS)and regional quasi-geoid to obtain the normal height.In order to serve the different scale mapping projects of provinces,the quasi-geoid applicability analysis of digitizing mapping in land area of China is analyzed in this paper.Firstly,the model of the regional quasi-geoid is introduced and the accuracy of the quasi-geoid model in different scale mapping is derived to meet the limit difference of elevation points under various terrain categories.Secondly,the accuracy of the regional quasi-geoid is counted for provinces.The result shows that the accuracy of most quasi-geoid is better than±0.1 m,it is shown that most quasi-geoid could meet the requirement of different resolution digital mapping,and provide the service for mapping in provinces.
normal heightregional quasi-geoiddigitizing mappingleveling
NETL
NSTL
万方数据
维普
