Perhaps this is the wrong list to ask, but I just read Martin Davis' column:
http://lin-ear-th-inking.blogspot.com/2010/08/magnifying-topology-using-jts.html
It's a tool for the Java Topology Suite (JTS) to discover small
topological errors in a vector map. It solves a problem that I have
suffered from during my whole GIS career: getting correct input maps.
How difficult would it be to implement this in GEOS, and, possibly, to
build a hook for it in PostGIS?
Jan
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