To Draw Curved Segments of Feature Lines

Arcs in feature lines are created tangential to the previous segment except when the Second Point option is selected to create a three-point arc.

1. Complete Steps 1-4 in To Draw Straight Segments of Feature Lines.
2. When you are prompted to select the next feature line point, enter Arc (A). The following prompt is displayed:

   Specify arc end point or [Radius/Secondpnt/Line/Undo]:

   Note: If you have not drawn any feature line segments, you are first prompted to establish the arc direction. For more information, see To Establish Feature Line Arc Direction.
3. Do one of the following:
   • Select the end point for the arc.
   • Enter Radius (R) and specify a radius.

     After entering the radius, the following prompt is displayed:

     Specify arc end point or [Length]:

     Select the end point or enter Length. If you use the Length option, specify a length and then a direction for the arc.

     Note: Because this option specifies a radius and the arc is tangent to the previous segment, the actual end point of the arc may not be at the selected end point.
   • Enter Secondpnt (S) and specify the second point for the arc.

     After selecting the second point, the following prompt is displayed:

     Specify arc end point or [Length]:

     Select the end point or enter Length. If you use the Length option, specify a length and then a direction for the arc.

     Note: The Length option creates an arc that is tangent to the previous segment and passes though the second point. The arc may stop short of the second point if the length is shorter than the arc length to the point.
4. Specify the elevation of the end point.
5. Continue to select arc points or enter Line to draw straight segments or Close to close the feature line.