Issue with DPOS through Jfield

Wes Cole

Active Member
I just spoke with @pappassurveyor regarding an issue I'm having with a DPOS session.

Yesterday I put a point in using RTN, then set up the base and proceeded with my survey. I checked into several known points and with RTK base/rover and all those work well. When I attached the base file today and processed the base position to DPOS it's coming back with a solution that's 3.8' horizontal and 4' vertical away from the RTN position. However, when I process the .jps file for the base through DPOS online (through my desktop) and I convert from meters to international feet I'm all over the RTN position. This project is in South Carolina, which is international feet.

The base is a standard LS and the Rover is and LS+.
Both projects are set up in SC Grid NAD 83/11, NAVD 88 geoid 18, and international feet.
As far as I can tell, the units match for both LS projects. I have sent both projects to support from each LS. They are named: 21-164 LS1 BASE and 21-164 LS2, serial numbers 0075 & 641.

So, basically my RTN derived position + the RTK base/rover survey appear to be correct positions, however when processing through DPOS it gets shifted. I can provide more information but this is the basics of the problem. Chris and I could not figure out the issue.
 

Adam Plumley

Active Member
5PLS
The shift shown is from the autonomous or dgps position stored with the point collected while the base is running. This needs to be fixed so that the shift from the starting rtn or known point is shown. I think it works correctly if you check known base in the base start screen.
 

Wes Cole

Active Member
The shift shown is from the autonomous or dgps position stored with the point collected while the base is running. This needs to be fixed so that the shift from the starting rtn or known point is shown. I think it works correctly if you check known base in the base start screen.
Thanks Adam. I sent both earlier.

Check base known in the start base screen? Not sure I’m familiar with that on the LS. Why would this even be an option that it doesn't shift it? Isn't that the purpose of processing to DPOS?
 
Last edited:

Adam

Well-Known Member
5PLS
When you tap start base, there is a checkbox for known base. Same screen where you enter the point name and description.
 
Top