Terms of Use

The use of all products provided on this server is free of charge. If you wish to use these products, please cite as:
re3data.org: VMF Data Server; editing status 2020-12-14; re3data.org - Registry of Research Data Repositories. http://doi.org/10.17616/R3RD2H

All atmospheric products (delay models, ray-traced delays, atmospheric pressure loading corrections) are based on Numerical Weather Models from the ECMWF. You are kindly requested to acknowledge the ECMWF when using atmospheric products provided on this server.

Products based on ECMWF operational and ERA-Interim data

Non-valid ECMWF products are governed by the Creative Commons 4.0 licence (CC BY 4.0). Non-valid data refers to any data with a verification time more than 24 hours in the past. In case of the VMF Data Server, this applies to troposphere delay models based on operational and ERA-Interim Numerical Weather Models as well as atmospheric pressure loading corrections. These products may be used commercially, subject to attribution.

Products based on ECMWF forecast data

ECMWF forecast data is not governed by the CC BY 4.0 licence, but underlies a separate licence agreement. Hence, troposphere delay models provided on this server, that are based on ECMWF forecast data, are password protected and for non-commercial, scientific use only.

Please contact vmf@tuwien.ac.at, if you require access to any forecast products. Mind that the password is changed quarterly. Forecast products from past years are open access and underlie the same terms as operational products.


Contents and products on this server are provided without warranty of any kind. We do not accept any responsibility for accuracy or completeness of information contained on this website. However, we strive to provide true and complete information as well as uninterrupted time series of tropospheric products.


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Johannes Böhm
Research Division Higher Geodesy
Department of Geodesy and Geoinformation
TU Wien
Wiedner Hauptstraße 8, 1040 Vienna, Austria

Janina Boisits
Satellite Positioning with GNSS and APOS
Department for Control Survey
Federal Office of Metrology and Surveying
Schiffamtsgasse 1-3, 1020 Vienna, Austria