Creating a great circle

Use the Great Circle tool to place a great circle object over the drawing. Unlike a 2D dimension that shows the linear distance between X and Y coordinates in 2D, a great circle is an arc that shows the shortest distance between two points on the sphere-shaped Earth. Use the Great Circle tool (instead of a 2D dimension tool) to measure distances in a georeferenced drawing.

The Document Georeferencing dialog box opens if the document is not yet georeferenced, to select a coordinate system. See Specifying document georeferencing.

To create a great circle:

1.      Click the tool and mode.

2.Click Preferences to open the Great Circle Properties dialog box and specify the tool’s default parameters. The parameters can be edited later from the Object Info palette.

Click to show/hide the parameters.

3.Click the drawing at the beginning point of the great circle, and click again at the ending point to create the object.

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Specifying document georeferencing

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