Hi Mike, I understand the basic concept of a union and resulting type, but how can the union of polygons result in anything but polygons? Thanks, JP
On Sun, Apr 13, 2014 at 5:56 AM, Mike Toews <mwto...@gmail.com> wrote: > On 13 April 2014 16:56, Juan Pablo Caram <jpca...@gmail.com> wrote: > > Hi, > > Is this at all possible? The GeometryCollection has a LineString! > > Sure, this is possible. A union can return any type of geometry, from > GEOMETRYCOLLECTION EMPTY to POINT to anything else. If the result is a > LINESTRING, then the union of the two geometries share a boundary. If > it is in a GEOMETRYCOLLECTION, then there is a mixture of types in the > same result, such as POINT and POLYGON parts. All these are possible, > and not so strange when you look at them drawn out. > > -Mike > _______________________________________________ > Community mailing list > Community@lists.gispython.org > http://lists.gispython.org/mailman/listinfo/community >
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