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Plots and reports of the IVS tropospheric parameter rapid combination can be accessed here.

The IVS rapid troposphere combination product is a combination of hourly zenith delay estimates provided by various Analysis Centers (ACs) of the International VLBI Service for Geodesy and Astrometry (http://ivscc.gsfc.nasa.gov/).

IVS Analysis Centers currently participating the IVS tropospheric product

We want to acknowledge other IVS ACs for their participation in the past:

The combined  parameters are the zenith total delays (ZTD) of the rapid turnaround sessions IVS-R1 and IVS-R4. Goal of the combination is the identification and exclusion of outliers by comparison and assessment of the precision of current VLBI solutions in terms of tropospheric parameters. The rapid combination is done on a weekly basis four weeks after the release of the observation files on IVS Data Centers. For more information about the IVS tropospheric combination strategy we refer to, please download here (pdf file, 3.5 MB).


Heinkelmann R.: IVS Rapid Troposphere Product - A Possible Extension Regarding the IGS TWG (C. Hackman), in: 21st Meeting of the European VLBI Group for Geodesy and Astrometry (EVGA) and 14th IVS Analysis Workshop, Espoo, Finland, 2013.

Heinkelmann R., J. Böhm, S. Bolotin, G. Engelhardt, R. Haas, R. Lanotte, D. S. MacMillan, M. Negusini, E. Skurikhina, O. Titov and H. Schuh: VLBI-derived troposphere parameters during CONT08, J Geod, Vol. 85, doi:10.1007/s00190-011-0459-x, 2011.

Heinkelmann R. and C. Schwatke: The Tropospheric Products of the International VLBI Service for Geodesy and Astrometry, IVS 2010 General Meeting Proceedings, 340–344, 2010.

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