Site calibration

Perform a site calibration to transform WGS-84 coordinates from the connected GNSS receiver into local grid coordinates (NEE).

You must complete a calibration before you compute offset or intersection points, or stake out points. If you change the calibration after computing or staking out these points, they will not be consistent with the new coordinate system and any points computed or staked out after the change.

To perform a site calibration:

  1. Before beginning a site calibration, configure the calibration tolerance settings. From the map, tap / Tolerances and then enter values for the calibration Horizontal and Vertical tolerance.
  2. Tap Control point and then touch-hold the GNSS button to open the GNSS Method dialog and then tap Calibration .
  3. Depending on your project, you may be prompted to select one of the following options:
    • Tap New to start a new calibration.
    • Tap Edit to edit the currently loaded calibration.
    • Tap Load and then select a saved calibration file from the list.
    • Tap Disable to discard the currently loaded calibration.
  4. To add a calibration point:
    1. Tap Calib. Pt. and select a reference node from the map. The calibration point coordinates appear.
    2. Select whether to use a three-dimensional/two-dimensional/one-dimensional coordinate.

    3. When the GNSS antenna is positioned directly over the point on the ground and you have made sure the antenna is vertical and not moving, tap the GNSS Measure button.

    Once the observation is stored, the icon on the Results button updates to show if the calibration results are within the configured calibration tolerance values or outside the configured calibration tolerance values .

  5. Tap the Results button to view the Calibration results dialog. Tap Report to view the results as a report, or tap Save as preset to save the calibration for use in future surveys.
  6. If required, tap Settings to change the scale factor or to use a fixed scale. To view how your changes affected the solution, tap the Results button to return to the Calibration results dialog.
  7. If required, you can remove observations that are outside the tolerance settings. To do this:
    1. Tap the GNSS node on the map (you can only do this when the calibration bar is open). The Observation details dialog appears.
    2. Exclude different elements of the observation by reducing the number of dimensions used for the measurement i.e. reduce from 3D/2D/1D to Off. Tap OK.
    3. To view how your changes affected the solution, tap the Results button to return to the Calibration results dialog.
  8. To apply the calibration, tap . To discard the calibration, tap .