ZTD yükseklik düzeltme modellerinin araştırılması: Orta Avrupa örneği

High accuracy tropospheric products play a key role in precise positioning. The parameters, such as Zenith Tropospheric Delay (ZTD), pressure and temperature, are obtained by troposphere models. However, height corrections should be considered for the parameters since troposphere models are produced for specific grid or model heights. In this study, different height correction models, named as exponential, cubic and hybrid, were investigated for Central Europe. In this context, ZTDs were calculated by using the data of ERA5 between 2020 and 2022 with Direct Numerical Solutions (DNS) software. The highest model accuracy was obtained by hybrid approach. However, higher accuracy was achieved in the analysis based on GNSS stations using exponential and cubic approaches.