Get your spatial datasets clean...
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Clean Polyline datasets - identify and correct topology problems.
How to identify topology problems in a polyline dataset?
How to correct topology problems in a polyline dataset?
How to create polygons from polylines?
取所有polyline的始点和末点,进行分类。然后再进行处理。
- Dangling - only one polyline ends in this node -- undershoots and overshoots
- Pseudo - two lines meet in this node
- Regular - three or more polylines are connected to this node
Export Nodes -- Clean Polylines -- Clean Dangling Nodes -- Clean Pseudo Nodes -- Building Polygons
Clean Polygon datasets - the overlay approach.
Identify overlaps and convert them to polygons
Identify gaps and convert them to polygons
Identify slivers and clean them
Clean Polygon datasets - emulating the coverage approach.
Convert the polygons to polylines.
Clean the polylines.
Build back the polygons.
Eliminate the "gap" and "overlap" polygons.
- Get your spatial datasets clean...
- get out & clean
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