Product Manual

How To
MAGNET Tools ver 1.0
170
1. Click the Custom button in the Datum
field of the Setup tab. This
button is available when one of the None, UTMNorth,
UTMSouth, UPS grid projections is selected in the Projection
field. These projections allow you to use different datums.
2. The Custom Datums List
window displays. In the window click
the Add
button to open the New Custom Datum window. The
General tab of the New Custom Datum window
contains all
necessary fields to define a new custom datum. Enter the
following information:
• Name
– enter a name for the datum.
• Ellipsoid
– from the list select a predefined ellipsoid used to
create the datum.
• DX
- enter the value of shift along the X axis in meters, which
specifies a coordinate transformation from the created datum to
WGS84. The default is 0.
• DY
- enter the value of shift along the Y axis in meters, which
specifies a coordinate transformation from the created datum to
WGS84. The default is 0.
• DZ
- enter the value of shift along the Z axis in meters, which
specifies a coordinate transformation from the created datum to
WGS84. The default is 0.
• RX
- enter the value of the rotation angle between the X axis of
the created datum and WGS84 in arc seconds. The default is 0.
• RY
- enter the value of the rotation angle between the Y axis of
the created datum and WGS84 in arc seconds. The default is 0.
• RZ
- enter the value of the rotation angle between the Z axis of
the created datum and WGS84 in arc seconds. The default is 0.
• Scale
- enter the value of the scale factor in ppm, which specifies
a coordinate transformation from the created datum to WGS84.
The default is 0.
• Note
– enter any additional notes about the datum.
• Alias
- when you select a datum from the list, all available
projection(s) for the selected datum automatically will be
available for the created custom datum.