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• 01:02, 25 August 2009 Wiki-Timmie talk contribs uploaded File:Geometries.pdf (Geometry Operations: OGR and GEOS The GEOS library http://geos.refractions.net provides the spatial predicates originally used in PostGIS, now OGR, and soon MapServer. In this exercise we'll explore unions, intersections, differences, buffers, and work ou)