Looking over my problem again, the result of a large union (e.g. using
Geometry.union or CascadePolygonUnion) does produce the output lines I
need, but then I lose any graph-like structure that would associate the
input lines with those union-produced lines. (I wasn't clear about that
requirement, sorry)
How can I produce/maintain a relationship between the input lines and the
"broken down" lines the union produces, without brute force checking
overlaps between the two?
On Wed, Feb 27, 2013 at 9:15 AM, Justin Deoliveira <[email protected]>wrote:
> Hey Brandon,
>
> I am not 100% sure i undersand what you are looking for. Are you looking
> to node the graph at intersections and line string endings?
>
> I am not sure if this will be what you are looking for but there is a very
> cool effect that can be achieved with JTS. Basically take all the line
> strings and join them into one multi linestring. Then union that multi
> linestring with a single point that exists on it. The result is a multi
> linestring where all the individual linestrings are properly noded at
> intersections.
>
> -Justin
>
>
> On Tue, Feb 26, 2013 at 9:47 AM, brandon willard <[email protected]
> > wrote:
>
>> Hello,
>>
>> I'm working with a bunch of LineStrings that mostly overlap, and I would
>> like to find a way to build a graph, or manipulate the geometries, so that
>> it ends up with vertices from the points at which they stop overlapping.
>> E.g. L1 = a->...->b->c, L2 = a->...->b->d and get vertices (a, b, c, d)
>>
>> I realize that it's possible to do this with a combination of JTS
>> intersections/differences and whatnot, but I'm working with a lot of a
>> LineStrings and was hoping there was something specifically for this that I
>> passed over.
>>
>>
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>>
>
>
> --
> Justin Deoliveira
> OpenGeo - http://opengeo.org
> Enterprise support for open source geospatial.
>
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