In this chapter, we will enter curve-fitted lines, point-to-point lines, parallel lines, and squared lines. Curve-fitted lines are defined at input by a small number of points, and the GIS will generate a smooth curve over these points to create the eventual line. They are suitable for smooth lines such as highways. Point-to-point lines are angular lines such as parcel boundaries. The operator must enter every one of its points. Parallel lines are generated at a distance from existing lines. Squared lines turn at 90† angles and are suitable for building outlines.

Add a curve-fitted line.

1. Display all features. Select the Edit > Line > Add > Fitted Curve menu item.

2. Enter the feature code. We will use $DUMMY to show that we are not entering anything real.

3. Use the crosshair to enter five points on the curve-fitted line.

(288525, 740609), 1: 800

4. A smooth curve will be fitted over the five points. Click on the left mouse button to confirm.

5. Refresh the screen afterwards to show the updated map.

 

The demonstration Edit graphic data: adding a three-point curve in Demo 2 shows how to add a curve using three points.

Show the points on the curve-fitted line.

Use a command we have introduced before to show the points making up the curved line we have just created.