Spectra Precision Survey Pro CE v3.60 GPS User Manual - Manual (Page 26)

GPS User’s Manual
22
Projection Mode Summary
Horizontal
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
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.
• This mode requires no transformation setup. Use this mode when
vertical coordinates do not need to be elevations.
If you are using Ground- TDS Localization for your horizontal
projection mode, and you are not using a geoid model, Survey Pro is
ready to start the RTK survey upon opening the new job. No
projection setup is necessary, so you should move ahead to the next
section on Configuring Receivers.