Trimble Business Center – PPK processing against multiple stations
I posted this in the Trimble forums as well, but I know there are a lot of power users here.
Our crews drove a couple of routes last week with a vehicle-mounted receiver in PP kinematic mode, logging continuous points at 1Hz.
I usually process PPK against a single station because in the past I was always working in remote areas and brought my own base to set up close to the project area. However, sometimes it helped to use a weighted mean of multiple solutions if I did have a second receiver to use as another base, and site conditions were not ideal.
We did not have any of our own bases running for these route surveys (not my project nor my decision), but there are three or four state reference stations within acceptable distance for PPK processing.
Processing results from each base station range from good to mediocre. We had some tough canyon areas and foliage to deal with. I would like to merge the processed route data from multiple stations into a weighted solution to get better final coordinates.
The problem is that “continuous topo” points are not handled in the same way as a “measured topo” point in TBC – once the first trajectory is processed, the points that came in with the .job or .jxl file are updated to match. Processing against another reference station for the same time window only adds another trajectory to the project, without incorporating that data into a weighted mean for the corresponding points. Project settings are to “compute weighted averages for all sideshots”, but my suspicion is that continuous topo points are not treated as sideshots and thus cannot be weighted.
I could certainly process my trajectories as vectors and combine them manually…but there are a few thousand points throughout the project. So that’s not happening.
I can run with a single-base solution if I have to, but for a few areas the results will be less than ideal. Not a deal-breaker for this project, but I would like to know if there is a way to combine continuous topo trajectories into a weighted solution for future reference.
Anyone ever done this before? Or if is this even possible?
Thanks in advance,
Eric
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