Tropospheric delays

Within the weekly processing of the SIRGAS Continuously Operating Network (SIRGAS-CON), the SIRGAS Analysis Centres operationally estimate tropospheric Zenith Path Delays (ZPD) with an hourly sampling rate. These ZPD estimates are the input data for the generation of SIRGAS tropospheric products, which provide weekly combined troposphere estimates of high-reliability for each SIRGAS station. The station positions, as a necessary part of this analysis, are taken from the SIRGAS weekly combined solutions. Consequently, stations without estimated positions in the weekly combination are not included in the combined tropospheric solution.

The SIRGAS tropospheric products are computed by the SIRGAS Analysis Centre for the Neutral Atmosphere (CIMA), which is operated by the Facultad de Ingeniería of the Universidad Nacional de Cuyo (UNCuyo, Mendoza, Argentina) in cooperation with the Facultad de Ingeniería of the Universidad Juan Agustín Maza (Mendoza, Argentina) and with support of the Argentinean Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET).

The SIRGAS tropospheric products are weekly generated with a latency of 30 days. They are available with an hourly sampling rate in daily SINEX TRO files since January 2014 and they can be downloaded from

More details about the processing strategy can be found at

Mackern M.V., Mateo M.L., Camisay M.F., Morichetti P.V. (2020). Tropospheric Products from High-Level GNSS Processing in Latin America. International Association of Geodesy Symposia Series, Vol 152, open access, doi: 10.1007/1345_2020_121.

Whenever you use the SIRGAS tropospheric products, please include this publication as a citation.


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