Spectra Precision Survey Pro v3.80 Recon GPS User Manual - Manual (Page 52)

GPS User’s Manual
48
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When you collect geodetic measurements, each new point is
assigned the set up group of the current base station.
•
When you set the base on an existing point with geodetic
coordinates, the point’s existing set up group is used as the new
base station set up group.
•
When you set the base on a point with existing plane coordinates
and compute geodetic coordinates using the ‘Move Base’
algorithm, the existing base station set up group is used as the
new base station set up group.
One Point Localizations
When you open a new job and you want to do a ground level survey
starting at the coordinate of the first point, you can do a one-point
localization when using
TDS Localization horizontal projection mode.
Below is a description of the easiest way to setup a new job projection
and start a survey.
1. Open a new job and assign the desired local north, east, and
elevation to the first point.
2. Set the GPS base receiver up on this point and GET an
autonomous position and SET the base.
3. At the projection prompt, choose
6ROYH 1RZ to open the Solve
Localization screen. With your base as the one control point, tap
6ROYH!.
4. Review the parameters of the solution.
•
Scale factor of 1.0 means coordinates will be at ground level at the
base station height. Distances measured with an EDM at this
height will be 1:1 with GPS measured coordinates.
•
Rotation of 0.0 means that the coordinate system's grid north is
equal to geodetic north at the meridian of the initial base. This is
equivalent to using a sun shot azimuth as grid bearing through
this meridian.