Arc Edge Locator 1. In the drop-down list above the function editor, select Magnitude Con- straints. 2. In the Function Editor, use the mouse to drag handles and set the Mag- nitude limits. See examples in the following figure. Setting the Magnitude Constraint in the Function Editor Position Constraint The Position constraint restricts the tool’s search for edges to a specific zone of the region of interest. l It is possible to graphically set a position constraint function when the approximate position of an edge is known beforehand. This is useful for scoring an edge based on its offset from the expected position.
l Values in the Constraint Function Editor indicate relative distance in the region of interest where 0.0 is the left-most position and 1.0 is the right- most position. To set the Position Constraint: 1. In the drop-down list above the function editor, select Position Con- straints. 2. In the Function Editor, use the mouse to drag handles and set the Pos- ition limits. See examples in the following figure. The position in the function editor corresponds to the same position in the display. ACEUser's Guide, 3.6.x, 18316-000 Rev A Page 380