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
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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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