Spectra Precision Survey Pro v4.6 Recon and Nomad User Manual - Manual (Page 266)

User’s Manual – GPS Mode
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6. Enter the Desired Local Ground Coordinate. This will
be the local plane coordinate of the origin Reference
Point
. It is recommended that you use a recognizably
different coordinate range to distinguish the values
from the grid coordinates. For example, a UTM
coordinate of (4,997,000, 356,000) could become
(5000,5000). The local coordinate you enter here is
subtracted from the scaled grid coordinate of your
reference point to get the Ground Offsets. Tap
Next>.
7. Review the Ground Coordinate parameters:
Reference Point Location
, Ground Offsets, and Ground
Scale
. When you are satisfied with the setup, tap
Finish.
8. If your projection record is a map projection zone, the
ground coordinate parameters will be added to the zone record to
create a zone based site. If you are already using a site record, the
parameters will simply be applied. In both cases, the Adjust with
Projection wizard will open with the Results screen to show the
updated job file points. Tap Apply to update the coordinate
system and job file points.
Note: If your projection is a zone based site, then the
localization parameters will automatically be converted
into the corresponding ground coordinate values. You do
not have to resolve the localization.
9. If the conventional Survey Scale factor is not set to
1.0, you will be prompted to set it to 1.0. Using
Ground Coordinates, EDM distances correspond 1:1
to grid distances.
Switching from Ground to Grid
1. When Ground Coordinates are set, go to the Survey
> Projection screen and tap Setup Ground
Coordinates
2. In the Projection Definition box, select Use Grid