Use this tab to transform the coordinate system specified on the Units And Zone tab to local specifications.
Displays the description of the zone that is selected on the Units And Zone tab.
Specifies whether to apply the settings for coordinate system zone transformation. Selecting this check box enables all the other settings in the dialog box. You cannot select this check box if a zone is not specified on the Units and Zone tab.
Specifies whether to apply the settings for curvature correction to survey data so that measured horizontal distances are reduced to the distances at the mean seal level (geodetic distances).
Specifies the mean elevation value of your project site with respect to the mean sea level.
Displays the spheroid radius for the spheroid used by the coordinate system. This value is the radius of a spheroid close to the shape of the Earth at sea level, approximately 6,370 km. The value shown in this box is derived from the ellipsoid for the current zone.
Specifies the type of scale factor:
Where:
A different value is used for each point or locations within the zone.
Specifies the grid scale factor. Enabled only when you select User Defined for Computation.
Use this section to specify a reference point for transformation. The reference point could be a benchmark that was used in a survey. It can be any point for which you know both the local coordinates and the grid coordinates.
Click to pick a reference point on the screen.
Specifies a reference point by its point number, Local Northing and Easting values, or Grid Northing and Easting values.
Use this section to specify a rotation about the reference point in one of two ways: specify a rotation point, or apply a grid rotation angle.
Click to pick a rotation point on the screen to set the local Northing and Easting.
Specifies a rotation point by its point number, Local Northing and Easting values, or Grid Northing and Easting values.
Click to apply a rotation angle to grid north and azimuth instead of using a rotation point.
Specifies the rotation angle to north. Enter an angle or click and pick a point or line in the drawing.
The rotation to grid north is the difference between the local coordinate system's north meridian and the grid north meridian of the current zone. If you are using True North, this value may equal the convergence angle. If you are using Magnetic North, this value is derived from the declination angle and the convergence angle.
Specifies the direction of the azimuth. Enter an angle or click and pick a point or line in the drawing.
Grid azimuth is the angle between the drawing north and the line defined by reference grid and rotation grid points.