Topological Errors
Many GIS software packages are equipped to find topological errors in your dataset.
Undershoot - a topological error that occurs when an arc which is supposed to intersect with another arc fails to reach that arc. See also Overshoot.
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Topological errors can be corrected either manually within v.digit or, to some extent, automatically in v.clean. Adjacent polygons can be found by v.to.db (see 'sides' option).
Attribute management ...
Accordingly, the level of sophistication and ease of use of this capability is vitally important and should be rated highly by those evaluating GIS software. Many of the editing that is undertaken involves the cleaning up of topological errors ...
 See also: Coordinate, Location, Model, Geographic, Layer
  
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