Geographic and Attribute Data: Selection, Input, and Editing - Introducing Geographic Information Systems with ArcGIS - page 308

FIGURE 5-5
14. Zoom in on the portion of the drawing shown in Figure 5-5. Click the Line Construction Tool in
the Create Features window again. You see that you can be as precise as you like in beginning
a line on a disk on the graphic image. However, you are stuck (for the moment) with the
locations of the endpoints you have already digitized. Digitize the line in the figure. Return to
the previous zoom extent.
If you wanted to be really precise, you could zoom in on every vertex. Don't bother on this project, since
you are simply learning the digitizing process, so accuracy is not a major consideration.
15. You may have trouble distinguishing the lines of the shapefile from the lines of the image. So
change the symbology of the shapefile polylines to a red line with width of 2. Now you can
clearly see where you have digitized the elements.
16. Continue to make polylines until you have created each polyline that corresponds to a line in
Foozit_Court.TIF. Be careful to make polylines between the black disks shown on the image.
Where there are no black disks but the line changes direction, make vertices. Do not ever make
a digitized line go through a black disk!
In case of “whoops”: If you start to make a line where there shouldn't be one, you can press Ctrl-Delete
to do away with it. If you complete making a line where there shouldn't be one, you can click the Edit tool
(next to the Editor drop-down menu), select the offending line by clicking it, and press the Delete key. It
wouldn't hurt to try both of these procedures out. And write them down in your Fast Facts File.
The order in which you digitize the polylines is unimportant. The direction in which you digitize the polylines
is unimportant. It's a good idea to save edits (in the Editor drop-down menu) along the way.