Comparison of Precipitable Water Vapor (PWV) Values Obtained From PPP And Radiosonde

Global Navigation Satellite Systems (GNSS) serve many different fields such as geodetic measurements, vehicle tracking systems, tourism, agriculture, military, deformation measurements and search and rescue studies. GNSS technologies also allow the study of solar activities, ionosphere and troposphere. In this study, the amount of Precipitable Water Vapor (PWV) was determined by using the tropospheric delays obtained by the Precise Point Positioning (PPP) method and these values were compared with the PWV values obtained from the radiosonde, which is accepted as a reference today. Within the scope of the study, the data of Samsun, Erzurum, Istanbul and Izmir radiosonde stations in Turkey and SAM1, ERZR, ISTN and IZMI CORS-TR stations in their nearby locations for the years 20162020 were used. CSRS-PPP service was used to process GNSS data. When the results obtained were examined, it was seen that the PWV values obtained by the two methods were in harmony and mostly showed a similar trend.