Creating a Ground Coordinate System

Jeff Juniewich at His Best!

Total CAD Systems' Blog

Have you ever wanted to add GIS data that is in GRID to your Civil project that is in Ground through FDO? Here is a two step procedure for creating a Ground Coordinate System. When creating a ground coordinate system for State Plane Zones that use the Lambert Conformal Conic projection there is no place to enter the scale factor. To get around this you must create a custom Ellipsoid.

Sample Scale Factor: 1.000130

First Step: Create a new Ellipsoid Definition

1. In the Map Setup Tab, from the Create dropdown select Create Ellipsoid Definition.

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2. In the Create Ellipsoid window select Create a new ellipsoid from and existing one.


3. Select GRS1980 from the list. In the Create Ellipsoid window hit Next.

4. In the Modify ellipsoid window, Modify Code: by appending the County Name (or project name).

5. Copy and paste the value from the Inverse…

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