On Sat, Jan 22, 2011 at 4:44 AM, Roald de Wit <[email protected]> wrote:
> Hi Andrea,
>
> Thanks for the clarification. The buffer example that you gave works as
> expected.
>
> I was hoping to take a shortcut to queries like: give me all tasmanian
> roads that intersect with tasmanian water bodies. After reading your
> response, I tried it using a JTS:intersects process that consumes the output
> of the gt:CollectGeometries sub-processes for both the roads and water
> bodies. It turns out that JTS:intersects is not happy with
> GeometryCollections.
>
What you are trying to do is simply not supported by the current processes,
in order to select the roads crossing water bodies
we'd need a new process that is given two collections and returns every
feature in the first collection that intersects
a feature in the second collection. That operation is known as a spatial
join.
I don't know of anyone working on such process, but relatively soon we
should have a process that returns the intersections
between two feature collections, as in, the result of intersecting the
geometries, with each intersection output having
all the attribute of the two features that generated the intersection
Cheers
Andrea
--
Ing. Andrea Aime
Technical Lead
GeoSolutions S.A.S.
Via Poggio alle Viti 1187
55054 Massarosa (LU)
Italy
phone: +39 0584962313
fax: +39 0584962313
http://www.geo-solutions.it
http://geo-solutions.blogspot.com/
http://www.linkedin.com/in/andreaaime
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