SIRGAS ZTD operational products (1_OPS), 2nd combination, period 2014-2024

Abstract

SIRGAS ZTD operational products, 2nd combination, period 2014-2024. In the Americas, the realization and densification of the International Terrestrial Reference Frame rely on the SIRGAS Continuous GNSS Network. As part of the weekly operational processing, the SIRGAS Analysis Centers estimate Zenith Total Delays (ZTD) at an hourly sampling interval, which serve as input for the generation of the official SIRGAS tropospheric products. The SIRGAS Analysis Center for the Neutral Atmosphere, operating at CIMA (Mendoza, Argentina), performs the weekly combination, providing daily SINEX TRO files since January 2014 with a latency of 30 days. These time series is conformed with a newly updated set of operational SIRGAS tropospheric products is introduced, incorporating statistical enhancements to the ZTD combination strategy for the period 2014–2024. This dataset includes all operational GNSS stations integrated into SIRGAS across the Americas They are provided in daily files for each station. Their format follows the SINEX_TRO version 2 specifications (Pacione & Dousa, 2020). Likewise, the naming convention of each file adheres to this standard. The products are available on the SIRGAS website since 2025, in the folder “1_OPS”, according to their corresponding data source. Whenever you use the SIRGAS tropospheric products, please include this publication as a citation. Mackern M.V., Rosell P.A., Mateo M.L., Camisay M.F. (2025). New SIRGAS ZTD products derived from IGS14 homogenization, updates in the combination strategy, and the inclusion of North American Stations. International Association of Geodesy Symposia Series, (under review) More details about the processing strategy can be found in the cited work.