Spectra Precision Survey Pro v4.5 Ranger User Manual - Manual (Page 221)

GPS Coordinates in Survey Pro
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Projection Mode Summary
Horizontal Projection Modes
Ground - TDS Localization
Local coordinates are at ground level, based on the project height.
Distances shot with EDM are at ground scale, so are 1:1 with
coordinates solved by the projection.
Default map projection and datum are automatically initialized with
RTK base setup.
Mapping Plane
Local coordinates are on a conformal map projection grid.
Distances shot with EDM are usually scaled by the combined scale
factor to distances on the map projection grid.
User selects map projection zone.
Vertical Projection Modes
Localization (+Geoid)
Vertical coordinate is orthometric elevation.
User must solve transformation from ellipsoid heights to elevations.
This is done with localization on control points, or using a geoid
model, or a combination of both.
Ellipsoid Heights
• Vertical coordinate is ellipsoid height.
Ellipsoid Heights mode requires no transformation setup. Use this
mode when vertical coordinates do not need to be elevations.
Coordinate System Set or Solved
There can be multiple steps required before your coordinate system is
ready to transform geodetic positions into local coordinates. The
status of your coordinate system may be in one of three states: un-
initialized, set, or solved.