Get your spatial datasets clean...

Source: Internet
Author: User
Tags polyline

 

Clean polyline datasets-identify and correct topology problems.

  • How to identifyTopologyProblems in a polyline dataset?

  • How to correctTopologyProblems in a polyline dataset?

  • How to Create polygons from polylines?

Take the start and end points of all polylines for classification. And then proceed.

  • 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.

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