Shapely

Shapely a nifty little Python library for geometric objects, predicates, and operations. It allows you to issue PostGIS-ish operations outside a database context for Pythoneers and Pythonistas. It's based on the widely deployed GEOS.

###Why

• Schuyler's BetaShapes Python script rock for creating neighborhood clusters.
• Mike's Skeletron for simplifying linework.

###Beware

Clean your topology before asking Shapely to operate on it. You must have 100% correct topology or Shapely will complain.