2011

Table Of Contents

See also:

■ Overview of Coordinate Systems (page 143)

■ Assigning a Coordinate System to the Current Drawing (page 147)

To define coordinate systems

■

To define a coordinate system (page 92)

■

To define a datum (page 94)

■

To define an ellipsoid (page 95)

■

To create a coordinate system category (page 97)

■

To modify or delete a coordinate system (page 98)

■

To modify or delete a datum (page 99)

■

To modify or delete an ellipsoid (page 100)

■

To edit or delete a coordinate system category (page 101)

Overview of Creating New Coordinate Systems

You can create acompletely new global coordinate system (page 2065) or use a

predefined coordinate system as a basis for creating your own. You can also

modify or delete any coordinate systems that you define. You cannot delete

any of the predefined coordinate systems supplied with AutoCAD Map 3D.

When you define a coordinate system you must specify the following

parameters:

■

map projection (page 2068) — Used to convert points from latitude and

longitude to Cartesian coordinates.

and one of the following:

■ datum (page 2059) — Reference point, line, or surface for mapping.

■ ellipsoid (page 2062) — Geometric surface whose plane sections are all circles

or ellipses.