Hi,
I was reading this question about polygon overlay, or "union" as ESRI calls it
https://gis.stackexchange.com/questions/304516/why-is-union-in-arcmap-much-faster-than-other-approaches.
The datasets are rather big but I believe that 15 GB of RAM it should be
possible to compute the overlay. I know that 8 GB is not enough.
There was one self-intersecting polygon in the data and I just deleted that.
However, OpenJUMP fails with this kind of errors.
com.vividsolutions.jts.geom.TopologyException: found non-noded intersection
between LINESTRING ( 49.07852376302085 -15.66880154079859, 49.07189806100846
-15.676539177405822 ) and LINESTRING ( 49.08705075854589 -15.566531517643565,
49.07189806100846 -15.676539177405825 ) [ (49.07189806100846,
-15.676539177405822, NaN) ]
at
com.vividsolutions.jts.noding.FastNodingValidator.checkValid(FastNodingValidator.java:145)
at
com.vividsolutions.jts.geomgraph.EdgeNodingValidator.checkValid(EdgeNodingValidator.java:94)
at
com.vividsolutions.jts.geomgraph.EdgeNodingValidator.checkValid(EdgeNodingValidator.java:59)
at
com.vividsolutions.jts.operation.overlay.OverlayOp.computeOverlay(OverlayOp.java:237)
at
com.vividsolutions.jts.operation.overlay.OverlayOp.getResultGeometry(OverlayOp.java:189)
at
com.vividsolutions.jts.operation.overlay.OverlayOp.overlayOp(OverlayOp.java:92)
at
com.vividsolutions.jts.operation.overlay.snap.SnapIfNeededOverlayOp.getResultGeometry(SnapIfNeededOverlayOp.java:96)
at
com.vividsolutions.jts.operation.overlay.snap.SnapIfNeededOverlayOp.overlayOp(SnapIfNeededOverlayOp.java:58)
at
com.vividsolutions.jts.geom.Geometry.union(Geometry.java:1391)
at
org.openjump.core.geomutils.algorithm.IntersectGeometries.nodeLines(IntersectGeometries.java:478)
at
org.openjump.core.ui.plugin.tools.IntersectPolygonLayersPlugIn.runIntersectionNew(IntersectPolygonLayersPlugIn.java:209)
at
org.openjump.core.ui.plugin.tools.IntersectPolygonLayersPlugIn.run(IntersectPolygonLayersPlugIn.java:142)
at
com.vividsolutions.jump.workbench.ui.task.TaskMonitorManager$TaskWrapper.run(TaskMonitorManager.java:152)
at java.lang.Thread.run(Unknown Source)
I wonder where the NaN coordinates are coming.
-Jukka Rahkonen-
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