Phil:
I had trouble downloading your sample data file. Could you send it to me
directly?
Also, if you could attach a screenshot showing one of the figures you are
trying to polygonize...that might help you get an answer from another JTS
user.
Landon
On Thu, Jul 21, 2016 at 4:10 PM, Phil Scadden <[email protected]> wrote:
> I managed to make some progress on this by perturbing points if union
> failed. However, when the full list of validated linearRings are feed into
> the polygonizer, it still crashes the polygonizer as before. It crashes in
> the 1.14 JTS Testbuilder as well.
>
> I have hundreds of these meshes to process.
>
> On 22/07/2016 9:40 a.m., Phil Scadden wrote:
>
> I reduced precision in the geometryFactory in attempt to make the
> polygonizer work. Now I have problem with TopologyException with union when
> trying to fix self-intersecting rings.
>
> My code for dealing with self intersecting rings...
> private static boolean addLineString(LineString lineString,
> Polygonizer polygonizer){
> GeometryFactory gf = lineString.getFactory();
> if(lineString instanceof LinearRing){
> lineString =
> gf.createLineString(lineString.getCoordinateSequence());
> }
> // unioning the linestring with the point makes any self
> intersections explicit.
> Point point = gf.createPoint(lineString.getCoordinateN(0));
> Geometry toAdd = lineString.union(point);
> Coordinate[] c = toAdd.getCoordinates();
> if (c[0].equals(c[c.length-1])) {
> //Add result to polygonizer
> // System.out.println(toAdd.toText());
> polygonizer.add(toAdd);
> return true;
> } else {
> // if the ring consists of point a,b,c,a where a-b-c are essentially
> colinear, then union destroys the ring - discard it
> System.out.println("Straight line detected: " +
> toAdd.toText());
> return false;
> }
> }
>
> lineString.union(point) produces topography exception:
> "
>
> *found non-noded intersection between LINESTRING ( 1566269.0 5566171.0,
> 1566550.0 5566381.0 ) and LINESTRING ( 1566565.0 5566390.0, 1566266.0
> 5566169.0 ) [ (1566295.5094339622, 5566190.811320755, NaN) ]" *These two
> lines are nearly parallel, and do intersect. I am working with 7 digits of
> precision in the input coordinates and can hardly see how it is reasonable
> to reduce precision further. Is there a better way to
> Notice: This email and any attachments are confidential. If received in
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>
> ------------------------------------------------------------------------------
> What NetFlow Analyzer can do for you? Monitors network bandwidth and traffic
> patterns at an interface-level. Reveals which users, apps, and protocols are
> consuming the most bandwidth. Provides multi-vendor support for NetFlow,
> J-Flow, sFlow and other flows. Make informed decisions using capacity planning
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>
>
>
> _______________________________________________
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>
> --
> Phil Scadden, Senior Scientist GNS Science Ltd 764 Cumberland St, Private
> Bag 1930, Dunedin, New Zealand Ph +64 3 4799663, fax +64 3 477 5232
> Notice: This email and any attachments are confidential. If received in
> error please destroy and immediately notify us. Do not copy or disclose the
> contents.
>
>
> ------------------------------------------------------------------------------
> What NetFlow Analyzer can do for you? Monitors network bandwidth and
> traffic
> patterns at an interface-level. Reveals which users, apps, and protocols
> are
> consuming the most bandwidth. Provides multi-vendor support for NetFlow,
> J-Flow, sFlow and other flows. Make informed decisions using capacity
> planning
> reports.http://sdm.link/zohodev2dev
> _______________________________________________
> Jts-topo-suite-user mailing list
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>
------------------------------------------------------------------------------
What NetFlow Analyzer can do for you? Monitors network bandwidth and traffic
patterns at an interface-level. Reveals which users, apps, and protocols are
consuming the most bandwidth. Provides multi-vendor support for NetFlow,
J-Flow, sFlow and other flows. Make informed decisions using capacity planning
reports.http://sdm.link/zohodev2dev
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