This LIGIG was developed to help you get access to the GNSS and Numerical Weather Prediction model data, produced by GNSS&Meteo Working Group Wroclaw University of Environmental and Life Sciences and Department of Climatology and Atmosphere Protection, University of Wroclaw.
You will find the Zenith Total Delay (ZTD) for all GNSS stations in Poland (120) processed with 1 hour interval, as well as a weather forecasts (6hours lead time) for the same stations. Using this website you can visualise, manipulate and export the ZTD data.
Procedures applied to calculate ZTD is available in the following papers: ):

Wilgan K., Rohm W., Bosy J. Multi-observation meteorological and GNSS data comparison with Numerical Weather Prediction model, Atmospheric Research, Vol. 156 No. , Amsterdam, the Netherlands 2015, pp. 29-42 DOI:

Bosy J., Kapłon J., Rohm W., Sierny J., Hadaś T. Near real-time estimation of water vapour in the troposphere using ground GNSS and the meteorological data Annales Geophysicae, Vol. 30 No. , Göttingen, Germany 2012, pp. 1379-1391 DOI: 10.5194/angeo-30-1379-2012

Hordyniec P., Bosy J., Rohm W. Assessment of errors in precipitable water data derived from global navigation satellite system observations Journal of Atmospheric and Solar-Terrestrial Physics, Vol. 129 No. , Amsterdam, the Netherlands 2015, pp. 69-77 DOI: 10.1016/j.jastp.2015.04.012

By using the data provided on this site you are requested to cite these papers.