GPS/MET localized water vapor conversion parameters study and analysis of space-time characteristics

With the rapid development of the global positioning system, its application in the field of surveying and mapping has continued to increase. In the direction of GPS meteorology, we can calculate the water vapor conversion parameters through ground-based GPS technology to obtain the atmospheric precipitation. Using local corresponding water vapor conversion parameters can effectively improve the accuracy of GPS water vapor inversion. This paper uses the data from 12 sounding stations in Southwest China in 2015-2018 to calculate the annual, quarterly, monthly and daily water vapor conversion parameters in Southwest China, and realizes the localization of water vapor conversion parameters. The analysis shows that, within a certain range, the water vapor conversion parameter П gradually increases with the increase of the station height, and the temporal and spatial distribution of the water vapor conversion parameter Π in southwest China has obvious characteristics of climate distribution and latitude zonality.