Trimble Business Center

Good morning TBC’ers! The time-dependent coordinate transformation feature in TBC, which is used to transform between ITRF 2014 at the epoch of measurement and the global reference frame, has been enhanced to use displacement models in the working area when available in TBC v5.40. 

A displacement model is a model of the movement of points on the surface of the Earth due to plate motion, tectonic strain accumulation, seismic/ post-seismic deformation, glacial isostatic adjustment, and/ or other geological or anthropogenic processes that cause significant coordinate changes over large areas. The model is used to propagate coordinates from one epoch (such as the epoch of measurement) to another (such as the reference epoch of the selected global reference datum). This ensures users obtain optimal accuracy in coordinate transformations and the best possible coordinates in the selected coordinate system.

The following table shows the current list of reference frames in which TBC and Trimble Access will be able to convert RTX positions with centimeter accuracy:

The Project Settings dialog has been updated to include two new read-only fields in the Coordinate System Summary section: Global reference datum (the reference frame for global coordinates) and Global reference epoch (the reference epoch for global coordinates).