Re: [Jts-topo-suite-user] LineMerger vs geometry.union()

[Jan T. H. <ma...@jt...>]

Dear Stefan,

The Openstreetmap Relation -> Multipolygon rules are very complex and cannot be simply done by a union method. You can either follow their implementation rules or use one of the existing parsers (like osm2pqsql) to generate polygons.

Jan


Am 12.07.2013 um 23:41 schrieb Stefan Steiniger <ss...@ge...>:

> Hi Martin et al,
> 
> I am wanting to create (multi-)polygons from *.osm data. Problem is that 
> several "ways" (read: LineStrings) can make up a polygons outershell.
> 
> see here: http://wiki.openstreetmap.org/wiki/Relation:multipolygon
> (in particular the image on the right side)
> 
> Now, after reading the JTS doc I am still unsure if geometry.union() - 
> looped over all (outer)ways does what I want. That is, if should use 
> LineMerger instead?
> 
> Any advise?
> 
> cheers from the southern hemisphere,
> stefan
> 
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