Trimble Connect User Forum

Zach Edwards posted 06-19-2024 17:19

Why are you using a local CORS base (or NTRIP VRS) with SiteVision? If you have the SiteVision subscription, you don't need to connect to a single base or NTRIP server. It will leverage Trimble VRS Now (if you have cellular and are in a VRS NOW area) or RTX (via cellular or Satellite). 

Pawel Hasiuk posted 06-19-2024 17:34

Hello Zach,

The reason behind using local CORS was that I got a misalignment of about 1m when using Trimble RTX Hub corrections. Don't know why.

Since posting that questions, I learned that if Sitevision is not used for a long time it may take a while to get the fix quickly. After about 2-3 days of painfull initialisation times it stated working fine and initializes itself very quickly.

Thank you 

Pawel

Zach Edwards posted 06-19-2024 17:41

Interesting. I have never seen it take longer than 3 or 4 minutes to get down to an inch or less on the XY. Perhaps it's the outgoing datum? I know that the native correction datum for RTX is ITRF 2014/ITRF2020. Is that what you are expecting as your datum? You are in Australia, right? I am wondering how it compares to your GDA system there. 

Pawel Hasiuk posted 06-19-2024 17:52

Yes , that is the datum, however the project is defined in GDA2020 and that is what I am using.

Got it going today with RTX but had to place the  model manually on control points and hopefully I will be able to apply the same json file for all other models within the project.

Problem with Australia is that it is constantly moving North East of about 70mm/year so it is just easier to use local CORS base station setup over the control point, at least everything ties in within the project.

Pawel