Specify Local Site Settings

Enter local site settings to create a ground coordinate system to accommodate elevation differences between your site and the ellipsoid. The scale factor can be calculated for you. Use the options to project grid coordinates onto locally surveyed ground coordinates so that grid distance matches ground distance.

You should define local site settings for the project location at the start of the project because this information is used in calculations. The application uses:

  • The project latitude to calculate the earth's radius
  • The project latitude and longitude to define the grid scale factor
  • The project height as the default elevation and to calculate the elevation factor

  1. Surveyed ground (in profile)
  2. Projected grid
  3. Ground distance (between surveyed points)
  4. Grid distance (between grid points correlated with the surveyed points)
  5. Projection (normal to the ellipsoid)
  6. Ellipsoid

Making this conversion (matching grid to ground) makes it easier to:

  • Georeference images
  • Edgematch PDF site plans
  • Show grid coordinates that reflect the measured ground distance

To specify local site settings:

  1. Select Local Site Settings in Survey > Network. TheLocal Site Settings command pane displays.
  2. Select a coordinate system to display in the Coordinate type list. Any changes take effect immediately.

    If you select Grid:

    1. Click in the Northing box.

    2. Pick a point in a graphic view, right-click for options, or type coordinates in the Northing and Easting boxes to specify the location for the local site.

    3. Pick a point in a graphic view, right-click for options, or type a value in theElevation box.

    If you select Local or Global:

    1. Click in the Latitude box.

    2. Pick a point in a graphic view, right-click for options, or type coordinates in the Latitude and Longitude boxes to specify the location for the local site.

    3. Pick a point in a graphic view, right-click for options, or type a value in theHeight box.

  3. To use a ground scale factor, check the Ground scale factor box.
  4. Type a value in the Ground scale factor box, or check Compute ground scale factor from project location to have the value computed.
  5. To close the dialog, clickOK.

To view the local site settings:

  1. Select Project Settings in the Quick Access Toolbar. The Project Setting dialog displays.
  2. SelectCoordinate System and then Local Site. The read-only Local Site settings display.

Related topics

Coordinate System Settings

Calibrate a Site