http://lin-ear-th-inking.blogspot.com/2007/11/fast-polygon-merging-in-jts-using.html
? On Fri, Sep 11, 2009 at 5:26 AM, Markus Eichhorn <[email protected]> wrote: > Hi list, > I've been trying to union a collection of Geometry-object (all elements are > polygons). But with the > geometry.union(other); it is much to slow for huge collection. In the end. > it should work with collection within 20.000 and more geometries.My code > looks like this: > > private Geometry unionIntoOneGeometry( > Collection<Geometry> geometryCollection) { > Geometry all = null; > for (Iterator<Geometry> i = geometryCollection.iterator(); > i.hasNext();) { > Geometry geometry = i.next(); > if (geometry == null) > continue; > if (all == null) { > all = geometry; > } else { > all = all.union(geometry); > } > } > return all; > } > Is there a better way to union all these polygons? I don't find a way with > good performace. > Thanks, > Markus > > > ------------------------------------------------------------------------------ > Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day > trial. Simplify your report design, integration and deployment - and focus > on > what you do best, core application coding. Discover what's new with > Crystal Reports now. http://p.sf.net/sfu/bobj-july > _______________________________________________ > Geotools-gt2-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/geotools-gt2-users > > ------------------------------------------------------------------------------ Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july _______________________________________________ Geotools-gt2-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/geotools-gt2-users
