Re: [Geotools-gt2-users] Building a connected graph with OSM data / Splitting LineStrings at their intersections

[Michael B. <mic...@gm...>]

Hi Christian,

I might not understand your data properly, but I think you want to do
something more like this...

    private List<LineString> splitMLines(ArrayList<MultiLineString> mlines) {
        GeometryFactory geomFactory = new GeometryFactory();
        List<LineString> lines = new ArrayList<LineString>();

        for (MultiLineString mls : mlines) {
            for (int i = 0; i < mls.getNumGeometries(); i++) {
                lines.add((LineString)mls.getGeometryN(i));
            }
        }

        Geometry grandMls = geomFactory.buildGeometry(lines);
        Point mlsPt = geomFactory.createPoint(grandMls.getCoordinate());
        Geometry nodedLines = grandMls.union(mlsPt);

        lines.clear();

        for (int i = 0, n = nodedLines.getNumGeometries(); i < n; i++) {
            Geometry g = nodedLines.getGeometryN(i);
            if (g instanceof LineString) {
                lines.add((LineString)g);
            }
        }

        return lines;
    }

Let us know what happens :)

Michael