Help creating Local Coordinate projection for CAD data

Discussion created by dplotsky on Oct 16, 2013
Latest reply on Nov 26, 2013 by dplotsky

I have some CAD data in an unknown local coordinate system that I have to get into a geodatabase in a State Plane coordinate system.  I have a CAD script that is currently being run to get do this from within AutoCAD, but I need to do this with Python instead now. I have some examples of the data in the State Plane coordinate system, but I am struggling as to how to find all of the parameters that I need to create the custom .prj file.

The script currently does:
1. Scale all -> 0,0 -> 1/12
2. Move all -> 18766.832,11612.104 -> 2829031.998,1017487.369
3. Rotate all -> 2829031.998,1017487.369 -> -30.0916403
4. Scale all -> 0,0 -> 0.9999129

I am unsure as to the best way to get the Easting, Northing, and Latitude and Longitude of Center. I think that the rotation and two scalings can be done by setting the rotation, units and scale factor. It is the rest that I am struggling to find.