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Although there have been many methods developed for line tracing, they can be divided into two groups: line thinning and line following.
in GIS packages are intersection, point in polygon, area in area, and other expressions of interrelationships between geographic entities that can be used to select, reject, merge, or query spatial data bases. Many GIS packages provide line thinning ...
 See also: Geographic, Attributes, Merge, Window, Conversion
  
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