Outputting precision site coordinates (NEE) and precise orthometric heights

Outputting north east elevation (NEE) site or map projection coordinates

Do one of the following:

  • Use the Configuration Toolbox utility to select a coordinate system from the database. Create the application file, and then:
  1. Load the application file into the receiver using the Configuration Toolbox utility. From firmware version 5.14 or greater, the SPS receiver can use *.cfg and *.csb files.
  2. Using the receiver web interface, select Receiver Configuration / Application Files. Click Upload and then click Start Now.
  • After a site calibration is performed with the Siteworks or SCS900 software, upload that information directly into the receiver:
  1. Load the *.dc or the *.cal file into your computer.
  2. Using the receiver web interface, select Receiver Configuration / Application Files. Click Upload and then click Apply Projection and Calibration file.

If an inclined plane is in the site calibration, then heights (GHT) are available that are based on the inclined plane.

Outputting elevations based on a geoid

The receiver computes ellipsoidal heights that are converted by the Siteworks or SCS900 software into local elevations using the inclined plane method or a geoid.

If you require the receiver to output elevations for another application in terms of the geoid (orthometric heights), then the default geoid model in the receiver may not be accurate enough for precise positioning.

To load and use a different precise geoid model:

  • Receivers with firmware v4.12 up to v5.12 can accept a subgridded Geoid up to 1 Kb in size.

  • Receivers with firmware v5.14 or later can use a subgridded Geoid up to 128 Kb in size. The subgridded Geoid can be created in the Business Centre PC software or with the Trimble Grid Factory PC software.

  • Use the Configuration Toolbox application software to merge the DC file with the subgridded Geoid file.

    The subgridded Geoid file that the Configuration ToolBox v7.0 can use must have the suffix *.ggf.

To use subgridded Geoids up to 128 Kb do the following:

  1. Run Configuration ToolBox v7.0 or greater.
  2. Select Coordinate System in the left panel.
  3. Press Coord Sys Settings button in the right panel and then select v10.60 CSIB setting.
  4. Press Import DC file or press Select (for a Map Projection).
  5. If you have selected Import from DC, there may be a further prompt for the subgridded Geoid (*.ggf).
  6. Press Save (to save the Application file and CSIB file) and/or Transmit, to send the two files to the SPS receiver.