Abstract According to the relationship between geoid and deflection of the vertical,a simplified formula for calculating deflection of the vertical using geoid model is given by designing a reasonable calculation scheme.The influence of the relative accuracy of geoid model,the distance between two points,the selection of known points and the number of known points on the calculation results,are discussed by simulating calculation.Using the GEOID12B model,the deflection of the vertical of the stations in the GSVS2011 and GSVS2014 projects and the western region of the United States (40°~45°N,100°~105°W,resolution is 1') are calculated respectively. The calculated results are compared with the measured values of the GSVS projects and the DEFLEC12B model values.The results show that the calculation accuracy of the north-south component and the east-west component of the deflection of the vertical is better than ±0.5″. It is shown that the geoid models with relative accuracy of cm level or even sub cm level can obtain higher accuracy deflection of the vertical.
LIWeichao,ZHANGXingfu,CHENZhiwei et al. Method and Accuracy Analysis of Calculating Deflection of the Vertical Basedon Geoid Mode[J]. jgg, 2019, 39(8): 843-848.
LIWeichao,ZHANGXingfu,CHENZhiwei et al. Method and Accuracy Analysis of Calculating Deflection of the Vertical Basedon Geoid Mode[J]. jgg, 2019, 39(8): 843-848.
