Regional Tropospheric Correction Model from GNSS–Saastamoinen–GPT2w Data for Zhejiang Province

Tropospheric delay models based on GNSS observations are essential for studying tropospheric changes. However, the uneven distribution of stations reduces accuracy in remote areas. Moreover, calculated by traditional models, which rely meteorological parameters, is lower compared to achieved models. At present, there sufficient surface observation facilities around world that can obtain parameters real time. It great importance make full use measured establish correction empirical free and open data, one through model without requiring any auxiliary information. We established a provincial real-time regional fusion using ground-based observations, model, data. Results showed three be fused with better higher spatiotemporal resolution. The Zenith Total Delay (ZTD) estimated reached 0.96/1.04/3.11 cm during quiet/active/typhoon period.