Comparison of the seasonal displacement parameters estimated in the ITRF2014 processing, what can we learn?
Abstract
In the ITRF2014 computation process, annual and semi-annual periodic coordinate variations have been simultaneously estimated with reference positions and velocities at each geodetic station. Those parameters were conventionally estimated in distinct reference frames for each space geodetic technique (GNSS, DORIS, SLR and VLBI) and so could not be compared. We have developed a combination procedure which allows a rigorous comparison of seasonal displacements estimated by different geodetic techniques. The level of agreement and the sources of discrepancies of seasonal parameters estimated by different techniques at co-location sites will be rigorously evaluated in both horizontal and vertical components. In addition, we model and supplement the elastic deformation induced by surface loading derived from the Gravity and Recovery Climate Experiment (GRACE) and the thermoelastic deformation of the ground to assess the quality of the combined seasonal parameters.
- Publication:
-
42nd COSPAR Scientific Assembly
- Pub Date:
- July 2018
- Bibcode:
- 2018cosp...42E.683C