Define Geometry     

The Define Geometry Tool allows you to make new geometry based on existing geometries.  To use this tool, you must have geometries defined on your image.  (Use the Fit Geometry Tool for this.)  Select the Define Geometry Tool then select (click on) two existing geometries on your image - a line will be generated between them.
   
                        

Right-click on the line to bring up the LineSegmentEntity edit box, as seen below.  Selecting the Entity tab allows you to adjust the colors, thickness, size, type and visibility of the line.  You can also select a Coordinate System. Make the necessary adjustments, click Apply and then Close.  The values will be updated according to your selections.




Selecting the Line tab allows you to enter values for both X, Y, and Z coordinates.  Make the necessary adjustments and click Close.  The line segment will be updated according to the values selected.