Spatial Data Editing
There are two types of digitizing errors: location and
topological errors. Location errors such as missing
polygons or distorted lines relate to the geometric
inaccuracies of spatial features, whereas topological
errors such as dangling lines and unclosed polygons
relate to the logical inconsistencies between spatial
features. To correct location errors, we often have to
reshape individual lines and digitize new lines. To
correct topological errors, we must first learn about
the topological relationships and then use a
topology-based GIS package to help us make
corrections.