MorePosted by: Michael Draper
Hello,
If anyone could help out here it would be much appreciated.
I have a project that was established via Trimble GPS utilizing the 2012A Geoid Model. We broke down a section utilizing a new No Projection/No Datum project in the TSC2. The above stated geoid model was used along with a mean project height to derive the ground scale factor for our local area.
Once we'd verified that the measured baselines were consistent with historical measurements in the section a 2 point (horizontal only-H scale fixed to 1) calibration was applied to a chosen section line to align the measurements with the local historical bearing structure.
After the project was established, coordinates for a control line (with a fixed distance) were entered with elevations of 0 and both ends of the control line were monumented using these coordinates.
I am now trying to utilize the control line for a total station traverse using a Sokkia Set 30R and the station setup residual is almost 2 tenths different (in 800') than the GPS measured baseline length. As soon as I perform the backsight opperation using the coordinates with an elevation of 0 everything works fine and the total station measurements appear to be fine.
Any help would be great.
Thanks.
To read the rest of this thread, click here
Hello,
If anyone could help out here it would be much appreciated.
I have a project that was established via Trimble GPS utilizing the 2012A Geoid Model. We broke down a section utilizing a new No Projection/No Datum project in the TSC2. The above stated geoid model was used along with a mean project height to derive the ground scale factor for our local area.
Once we'd verified that the measured baselines were consistent with historical measurements in the section a 2 point (horizontal only-H scale fixed to 1) calibration was applied to a chosen section line to align the measurements with the local historical bearing structure.
After the project was established, coordinates for a control line (with a fixed distance) were entered with elevations of 0 and both ends of the control line were monumented using these coordinates.
I am now trying to utilize the control line for a total station traverse using a Sokkia Set 30R and the station setup residual is almost 2 tenths different (in 800') than the GPS measured baseline length. As soon as I perform the backsight opperation using the coordinates with an elevation of 0 everything works fine and the total station measurements appear to be fine.
Any help would be great.
Thanks.
To read the rest of this thread, click here
