Edit a coordinate systems Earth's constants that are used when applying corrections.
Manage / Configuration / Coordinate Systems
/ Coordinate Systems / 
or 
/ Earth Constants
An open project
| General | Description |
|---|---|
| Earth's Radius | Radius of Earth used for curvature and refraction, and height corrections. |
| Default Height | The height assigned to two dimensional vertices when a height is required for display and height correction. |
| Default Geoid Undulation | Default geoid/ellipsoid separation. A negative value indicates the geoid is below the ellipsoid. |
| Ground Scale | Description |
|---|---|
| Use combined scale factor | Combined Scale Factor is applied when checked. |
| Combined Scale Factor | Factor replacing point scale factor and height correction. |
| Point Scale Factor | Factor used to calculate ground distances. |
- Some Earth's constants are only available for Plane coordinate systems.
- The Default Geoid Undulation is used when:
- An imported DBX job file or HEXML job file references a geoid model that cannot be located during the import process.
- An imported file does not reference a geoid model and a geoid model is not configured for the projects coordinate system.
