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.

To create a great circle:

1. Click the tool and mode, and then click Preferences.

The Great Circle Properties dialog box opens.

Click to show/hide the parameters.

Parameter	Description
Show Distance	Places a distance measurement on the drawing
Distance Unit	Select the unit to use for the distance measurement
Show Angle	Places an angle measurement on the drawing
Angle Format	Select whether to use an azimuth or bearing format for the angle display
Reverse	Reverses the direction of the angle measurement

2. 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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Entering Georeferencing Information for a Design Layer

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