3:30 PM - 4:30 PM
[G01-P-08] Assessment of displacement models used in time-dependent transformations. The particular case of California.
The support of time-dependent transformations for surveying and GIS is becoming a critical issue. The main challenge is to calculate the accurate displacement of a station between two epochs. We focus on the uncertainties of station velocities used. In a first approximation, we use a global tectonic plate model to calculate point velocities. We show the impact of the velocity model on the coordinate accuracies.
Several countries, particularly in active regions, are developing semi-dynamic reference frames. These frames include local displacement models updated regularly and/or after major events (such as earthquakes). We study the particular case of California and the Horizontal Time-Dependent Positioning model developed by the NGS. We show it improves greatly accuracy of estimated displacements.
The integration of these local deformation models into surveying or GIS applications is an upcoming challenge. We want also to encourage the geodetic community to develop and use standard formats.
Several countries, particularly in active regions, are developing semi-dynamic reference frames. These frames include local displacement models updated regularly and/or after major events (such as earthquakes). We study the particular case of California and the Horizontal Time-Dependent Positioning model developed by the NGS. We show it improves greatly accuracy of estimated displacements.
The integration of these local deformation models into surveying or GIS applications is an upcoming challenge. We want also to encourage the geodetic community to develop and use standard formats.