Just curious if anyone else in NC has noticed above normal horizontal positional errors during multiple occupations using RTN??ÿ This is in clear fields with no multipath and pole has been checked from plumb.?ÿ SOP has been (2) 90s shots with pole spun 180 and a repeat observation 4 hours later or next day.?ÿ Since 2015, I have not personally noticed multiple shots being greater than 0.10?? (in clear sky), normally 0.05' or less.?ÿ Now I have been getting upwards of 0.20?? difference.?ÿ This is same day occupations and returning to undisturbed control points from 1-2 years ago.?ÿ?ÿIs this typical in other states??ÿ Any insight on why or tips to reduce error would be appreciated.
I have been disappointed with NC VRS over the last few weeks to say the least. I have resorted to establishing a single point on site with VRS, setting up a base while collecting static for redundancy, and running a rover on site. My base and rover have excellent repeatability. NC VRS - not so much lately. 0.1??-0.2?? horizontal/vertical
I have pretty much stopped using any VRS for work at the 0.03 m level or better (0.1 feet). Two readings at the same time (i.e. 180 epochs, reinit, 180 epochs) will usually be OK, but different times of the day I would have a significant percentage above that, which means the back-to-back obs they really aren't meeting that spec even though they seem to be.
The VRS work fine at the 5 cm level, but trying to get better than 3 cm I will use a local base.?ÿ
I have been disappointed with NC VRS over the last few weeks to say the least. I have resorted to establishing a single point on site with VRS, setting up a base while collecting static for redundancy, and running a rover on site. My base and rover have excellent repeatability. NC VRS - not so much lately. 0.1??-0.2?? horizontal/vertical
We use very similar methods and my B/R is typically really good too. I do not run on VRS alone. There has been a lot of email, most of which I delete, coming in about the NC VRS issues. We use our NC VRN login very little.
We have given up on VRS too - accurate most of the time, but some odd and unexplained jumps, particularly in heights. Found we could not rely on it.
I don't have access to a VRS, but our B/R combinations have become extremely tight, very repeatable, anything over .1' is unusual.?ÿ