Projection

A projection is used to transform local geodetic coordinates into local grid coordinates. GNSS coordinates are relative to the WGS‑84 ellipsoid. To work in local grid coordinates during a GNSS survey, you must specify a projection and datum transformation.

You can specify a projection:

  • when a job is created and you have to choose a coordinate system (select from a list, or key in)
  • during a survey (you calculate values by performing a calibration)
  • in the Trimble Business Center software, when the data is transferred.

Enter an appropriate default height value for the software to correctly calculate a sea level correction and then apply it to the grid coordinate.

If a projection and datum transformation are specified, you can reduce any discrepancies between the WGS‑84 coordinates and the local grid coordinates by performing a site calibration.