Digitizing and Editing Vector Data - Desktop GIS: Mapping the Planet with Open Source Tools - page 74

Figure 5.4: Results of digitizing lakes in QGIS
actually write our changes out, we need to stop editing by clicking the
tool in the toolbar or right-clicking the layer and choosing Allow Editing . A
confirmation dialog box appears, and we have to choose Yes to save the
edits. Once we do that, the lake appears like a regular polygon feature,
properly colored, and we can both identify it and view the attribute
table. In Figure 5.4 , you can see the results of our digitizing effort, with
the lakes labeled using the name field in the attribute table.
Fixing Mistakes
As you digitize, you are bound to make mistakes. You might find that
you didn't follow the shore quite right, made a line too straight when
it should have been curved, or just totally bungled the boundary. Typ-
ically the best approach is to continue and then correct the problems
after you have completed the feature.