Hi Mike, this seems to be a limit in the img format. If I got that right an entry in NET refers to more than 0x80 entries in RGN. This seems to be too much and should not happen. The program should probably split the road somewhere so that more entries in NET are created or it is split too often. The question is where to detect the situation. Maybe you can post a patch or describe how to reproduce the problem? Gerd ________________________________________ Von: mkgmap-dev <mkgmap-dev-bounces@lists.mkgmap.org.uk> im Auftrag von Mike Baggaley <mike@tvage.co.uk> Gesendet: Donnerstag, 12. Juli 2018 12:36 An: 'Development list for mkgmap' Betreff: [mkgmap-dev] Assert error Hi, I have just started getting an assert of "too many polylines at level 1" with my latest UK build. Any suggestions what I need to change? java.lang.AssertionError: too many polylines at level 1 at uk.me.parabola.imgfmt.app.net.RoadDef.writeLevelCount(RoadDef.java:333) at uk.me.parabola.imgfmt.app.net.RoadDef.writeNet1(RoadDef.java:228) at uk.me.parabola.imgfmt.app.net.NETFile.write(NETFile.java:67) at uk.me.parabola.mkgmap.build.MapBuilder.makeMap(MapBuilder.java:314) at uk.me.parabola.mkgmap.main.MapMaker.makeMap(MapMaker.java:107) at uk.me.parabola.mkgmap.main.MapMaker.makeMap(MapMaker.java:69) at uk.me.parabola.mkgmap.main.Main$1.call(Main.java:293) at uk.me.parabola.mkgmap.main.Main$1.call(Main.java:289) at java.util.concurrent.FutureTask.run(Unknown Source) at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at java.lang.Thread.run(Unknown Source) Thanks, Mike _______________________________________________ mkgmap-dev mailing list mkgmap-dev@lists.mkgmap.org.uk http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev