I set a couple of points using our state VRS and decided to check them with OPUS since there is flood on the property. The OPUS position was 0.02' and 0.03' horizontally from the VRS positions and were 0.06' higher.
I also collected simultaneous static so that I could process in LGO and wound up occupying the same point with two different GPS units, so I sent the data to OPUS from both GPS units on one of the points. The results came back and I had to make sure that I had not submitted the same data twice. The values matched each other flat to the millimeter, X,Y and Z. This is the first time I have ever seen this.
ekillo, post: 373151, member: 773 wrote: I set a couple of points using our state VRS and decided to check them with OPUS since there is flood on the property. The OPUS position was 0.02' and 0.03' horizontally from the VRS positions and were 0.06' higher.
I also collected simultaneous static so that I could process in LGO and wound up occupying the same point with two different GPS units, so I sent the data to OPUS from both GPS units on one of the points. The results came back and I had to make sure that I had not submitted the same data twice. The values matched each other flat to the millimeter, X,Y and Z. This is the first time I have ever seen this.
My main goal is to screw things up the same way every time. Sounds like you nailed it
OPUS an do that , especially on the same day when the observed sites and he CORS have similar and consistent weather.
Some ways to check that they are different files is to look at the number of observations submitted and/or used or he peak to peak values, which can vary for the exact same coordinate positions.
It is possible to have the exact Lat and Lon but the SPC values vary by 0.001.
Getting the exact same coordinates using a different set of CORS is the more difficult feat.
VRS can be very different for short time periods, which is the nature of GPS and reason for repeat VRS and long OPUS observations.
Paul in PA
