Even with all of the settings being correct I have had 2 instances where the initial "fix" was resolved incorrectly resulting in a similar error while staking. It is rare but does happen and can't be detected without a check to a known point. Forcing the RTK engine to reprocess its "fix" was all that was needed to correct the situation.
Even with all of the settings being correct I have had 2 instances where the initial "fix" was resolved incorrectly resulting in a similar error while staking. It is rare but does happen and can't be detected without a check to a known point. Forcing the RTK engine to reprocess its "fix" was all that was needed to correct the situation.
My experience as well, particularly with the R8-3, but also a couple of times with the R10. Seems to be some combination of MP , perfect alignment of satellites and an overly optimistic solution algorithm. SOP for us to do a check at beginning and end as well as re-initializing when in doubt.?ÿ
Did you start the job with autonomous, opus it, and shift the coords by your 4-5 ft amount, (in the office) then load design coords back into data collector, and USING THE AUTONOMOUS base coord, proceed to stake opus based design points?
If you did, then you must remember, "what you do to your job, you must do to your WHOLE job".
Or, maybe it got corrections from another surveyor, on that radio frequency.
Were you using your own base?
Did you set base in SAME location both times?
What DC are you using?
What brand gps?
N
I have on a few occasions had a similar issue. I loaded design coordinates into the controller, and then remembered to apply the combined factor. The controller handled it just fine, but the pc software made some sort of wild transformation when I downloaded the as staked coordinates, showing something like the amount you are seeing. Loaded a new file, with combined factor applied in the pc before loading, went out & checked it, all stakes were already in the correct position, and the as staked coordinates came back into the pc just fine. Don't know what causes it, just know if working with ground coordinates in a pseudo state plane, I need to apply the combined factor before loading the file.?ÿ
I would venture to say that very few people, working in the USA, on this list should be using a transformation from WGS84 to NAD83 in their collector.?ÿ For decades the manufacturers have been telling us to use enter our control as WGS84, the trouble is that with the exception of the military, our control is provided in some flavor of NAD83.?ÿ The NSRS is currently NAD83[2011 epoch2010] and I do not know of any real time networks that are broadcasting in WGS84 / ITRF.?ÿ If your WGS84 and local geodetic values are different then you should definitely check your settings.
Unless you are using Trimble RTX, then you should be using that transformation
The Louisiana C4GNet has mount points in both NAD83 and ITRF. Slightly dangerous, I try to make sure my crews know not to use the ITRF.
We use the transformation for points collected with WAAS, which we use fairly frequently in the marsh and for boat work.
I think that is a great idea to offer different reference frames on the VRS. Yes, it can be confusing but then again the field crew should know and understand the difference.?ÿ
John,
I had not thought of that type of situation.?ÿ I would assume that Leica's similar solution probably works in ITRF as well.?ÿ I have not had the need to play with them.
PPP in all of its flavors also requires the transformations but that is more of a workstation issue.
Thanks.
I think that is a great idea to offer different reference frames on the VRS. Yes, it can be confusing but then again the field crew should know and understand the difference.?ÿ
I wish the ODOT would have added mount points for both the current NAD83[2011 epoch 2010] values and the last rendition of NAD83[COR96 2002] they broadcast.?ÿ I would have been nice to finish off projects without determining a transformation.
The C4GNet is operated by LSU and for a long time it was only broadcasting NAD83(2011) 2010.00. They recently upgraded their servers and software and now they offer a plethora of VRS and PPP correction streams in both reference frames.
Their web site is c4gnet.xyz if you're interested in checking them out. I'm sure Randy (administrator) will be at Dimensions.
