Abstract Taking into account the assumptions of GNSS water vapor tomography algorithm and the characteristics of water vapor density changing with elevation, we propose an automatic vertical non-uniform stratification method for GNSS water vapor tomography by setting a reasonable threshold value of water vapor density changing with height. To carry out the regional GNSS water vapor tomography test, we use GNSS observation data in Hong Kong for 6 consecutive days, using the automatic vertical non-uniform stratification method and the traditional vertical uniform stratification method. Taking the ECMWF data as a reference, the accuracy of GNSS water vapor tomography is verified. The results show that the mean deviation and the mean root mean square error (RMSE) of the wet refractive index obtained by the automatic vertical non-uniform stratification method is 3.9 mm/km and 4.6 mm/km, which decreases by about 20.4% and 23.3%, respectively, compared with the vertical uniform stratification method.
FAN Shijie,CHEN Yan,PENG Xiuying et al. Automatic Vertical Non-Uniform Stratification Method for GNSS Water Vapor Tomography[J]. jgg, 2021, 41(9): 924-928.
FAN Shijie,CHEN Yan,PENG Xiuying et al. Automatic Vertical Non-Uniform Stratification Method for GNSS Water Vapor Tomography[J]. jgg, 2021, 41(9): 924-928.