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GNSS/TS Traverse with Trimble Access
Posted by firestix on May 12, 2023 at 2:57 pmLooking for some insight on a good workflow to run a Hybrid (GNSS/TS) traverse using Trimble Access software.
RobertUSA replied 11 months ago 5 Members · 11 Replies- 11 Replies
SOP for us is to set up with a typical projection (usually state plane) and apply a project scale factor if appropriate, to keep checks between GNSS/TS within reason.
Then observe control as usual (Measure Rounds for total station, Observed Control Points for GNSS), keeping the same point number and choosing to “Average” or “Store Another” each time regardless of whether it’s with the instrument or receiver. This keeps you from having to merge/clean up points while processing and is just good practice anyways so you can see the deltas and standard deviations as you add observations. Observation order doesn’t matter since it’s going to be post-processed.
Dump into TBC, determine if I need to modify the coordinate system and/or scale factor, and then run network adjustment. All done.
You can select the “Traversing” and “Move Forward” options in the station setup options if you want to mimic a conventional traverse, but it doesn’t change how the raw data are stored.
If you are going to try and run a compass rule traverse (not really recommended when mixing GNSS observations), just make sure that you have your closing angles observed. You can run that in Access directly, or wait until it’s in TBC.
“…people will come to love their oppression, to adore the technologies that undo their capacities to think.” -Neil Postmanan averaged point in TA is seen as a computed point which is held higher than adjusted in TBC.
Nope. Network adjusted takes precedence, then traverse adjusted, then down through control, survey, mapping, unknown.
However, a coordinate record at survey-quality or higher is ranked higher than an observation, which means that an average position will take precedence when brought into TBC (absent any other modifications in the field).
Averaging in the field lets one see the weighted average and corresponding standard deviations, which is why I prefer it. Using Store Another is fine if the user is OK with using the first and only the first observation while in the field, but I like to check my position and dial it in as I re-observe.
In either case, I really don’t care because the network adjustment is going to override whatever a priori coordinates I happen to have.
“…people will come to love their oppression, to adore the technologies that undo their capacities to think.” -Neil PostmanIf you don’t have TBC you will probably have to modify what rover stated a but to fit the system in which you adjust in. I do my best on all new jobs to start out with state plane. Regardless of what they use robot or rtk vrs rtk base and rover. All i. Trimble access. @rover is correct keep the point numbers the same store another. Once you get the hang of it you can approach a job and knkw exacty how you need to design your network for control and or boundary corners. Keeping good practices and build a good geometric strength of figure with redundancy and you can absolutely fly on jobs. TBC or starnet is a must in my opinion. If not you are basically setting up and running a loop Traverse. Adjust by compass rule etc. i am no drafting guru especially the all powerful civil 3d. What i can tell you is. If I were solo tomorrow. And I owned Trimble equipment. I would have TBC and no other drafting software. Today i pushed out 8 sheets of plan plan and profile x sections etc. all inside TBC. I will not for one minute deny the civil 3d / auto cad is probably king on drafting. But TBC does just fine. For what it’s worth my push matches civil 3d and basically no difference in the final deliveries. Of course I matched all text layering and all to see just how well it could be done. No doubt civil 3d could beat me in speed but my learning curve is so much shorter on TBC to get out what was needed.
If you don’t have TBC you will probably have to modify what rover stated a but to fit the system in which you adjust in. I do my best on all new jobs to start out with state plane. Regardless of what they use robot or rtk vrs rtk base and rover. All i. Trimble access. @rover is correct keep the point numbers the same store another. Once you get the hang of it you can approach a job and knkw exacty how you need to design your network for control and or boundary corners. Keeping good practices and build a good geometric strength of figure with redundancy and you can absolutely fly on jobs. TBC or starnet is a must in my opinion. If not you are basically setting up and running a loop Traverse. Adjust by compass rule etc. i am no drafting guru especially the all powerful civil 3d. What i can tell you is. If I were solo tomorrow. And I owned Trimble equipment. I would have TBC and no other drafting software. Today i pushed out 8 sheets of plan plan and profile x sections etc. all inside TBC. I will not for one minute deny the civil 3d / auto cad is probably king on drafting. But TBC does just fine. For what it’s worth my push matches civil 3d and basically no difference in the final deliveries. Of course I matched all text layering and all to see just how well it could be done. No doubt civil 3d could beat me in speed but my learning curve is so much shorter on TBC to get out what was needed.
Edit. So assuming all you have is a robot and rtk rover. Software you need to adjust in Trimble access. Set your starting pairs with gnss rtk. First observation. To keep it simple at first start a new job file link to that rtk job. Set up robot run traverse loop etc. switch back to gnss job re shoot the gps points your starting pairs do the average so use same point number. If they fall within the tolerance. That average is a statistical average in Trimble access. Once you know those are good and your robot traverse in other job is good on itself. Export those two good average gps pairs as control. Import them as control to robot job. Same point number. Adjust traverse and export that out and now your control is done. Use that control for everything else. You can do it all in same job. But you are stuck with a compass rule adjustment so traverse from the known pairs. Back to itself or to another two pairs down the road.
Access 2015 is old. Access have traverse adjustment but not a network adjustment. You could use RTK as a check but not much else without TBC
@baba234 I have been using the power hour’s YouTube channel and elearning and such. Been slf teaching myself as much as possible. Help menu etc. I think power hours and most of the Trimble videos do a good overall job of how to accomplish whatever task. A good formal with a instructor would be awesome for the small details in between that need to be done. I have used sitech channel as well. Some good information i have learned. I truly think if I would have had a week course from the start i would have been much further ahead.
@baba234 Trimble has videos on YouTube and a long archive of power hour webinars on one of their webpages
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