As long as the set of ways is well-formed (specifically, has no overlaps),
then you should be able to use *either* union() or LineMerger. LineMerger
should work, and will perhaps be a bit more efficient for large sets of
ways (since it does not try to node them first, but assumes they form a
fully-noded graph already).
The union() semantics have not changed, and they are explained in the
Javadoc:
http://tsusiatsoftware.net/jts/javadoc/com/vividsolutions/jts/geom/Geometry.html#union()
If you find anything that does not accord with the above, then let me know.
On Fri, Jul 12, 2013 at 2:41 PM, Stefan Steiniger <[email protected]> wrote:
> 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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