1. The IAG combined global GNSS velocity field (JWG 3.2)
- Author
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Santamaria, A., Rietbroek, R., Frederikse, T., Rebischung, P., and Legrand, J.
- Abstract
Estimates of GNSS velocities are significantly impacted by the choices made concerning the GNSS data processing (corrections applied and noise level of the series), the completeness of the series and the alignment to a reference frame. In particular, position discontinuities, that populate the GNSS time series, have probably the biggest impact on the velocity error. All these effects may produce, at least, an increased velocity uncertainty, but it may also lead to biased velocity estimates. The result is that GNSS velocities estimated by different analysts can significantly differ from each other, even when using exactly the same position series.The objective of the IAG Joint Working Group 3.2 is to provide a combined global GNSS velocity field that takes into account the dispersion of the different velocity estimates at the same sites provided by different groups together with their alignment and their relative weighting. We expect that this IAG combined GNSS velocity field will be useful for the scientific community inside, but especially outside, the geodetic community in areas such as tectonics, sea-level change and GIA modeling among others. In this contribution, we present the latest global combined velocity field based on the available global and regional velocity fields provided by several groups, and show the level of agreement between the velocity fields., The 28th IUGG General Assembly (IUGG2023) (Berlin 2023)
- Published
- 2023
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