On compiling contourlines with DEM of Antarctica - I get this error: java.lang.ArrayIndexOutOfBoundsException: 7 at uk.me.parabola.mkgmap.reader.hgt.HGTConverter.prepReader(HGTConverter.java:408) at uk.me.parabola.mkgmap.reader.hgt.HGTConverter.fillArray(HGTConverter.java:269) at uk.me.parabola.mkgmap.reader.hgt.HGTConverter.getElevation(HGTConverter.java:149) at uk.me.parabola.mkgmap.reader.hgt.HGTConverter.getHeights(HGTConverter.java:633) at uk.me.parabola.imgfmt.app.dem.DEMSection.calcTiles(DEMSection.java:139) at uk.me.parabola.imgfmt.app.dem.DEMSection.<init>(DEMSection.java:84) at uk.me.parabola.imgfmt.app.dem.DEMFile.calc(DEMFile.java:112) at uk.me.parabola.mkgmap.build.MapBuilder.makeMap(MapBuilder.java:341) 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:290) at uk.me.parabola.mkgmap.main.Main$1.call(Main.java:286) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at java.lang.Thread.run(Thread.java:748) java.lang.ArrayIndexOutOfBoundsException java.lang.ArrayIndexOutOfBoundsException It happens with: java -ea -jar -Xmx20000M /home/contourlines/mkgmap.jar --dem=/home/contourlines/hgt/VIEW1/,/home/contourlines/hgt/SRTM1v3.0/,/home/contourlines/hgt/VIEW3/,/home/contourlines/hgt/SRTM3v3.0/ --dem-dists=5520 --dem-poly=/home/contourlines/bounds/antarctica.poly --max-jobs=1 --reduce-point-density=3.6 --transparent --description=openmtbmap-srtm-ANTA-13-Apr-2018 --style-file=srtm --latin1 --draw-priority=24 --mapname=74990000 --family-id=7499 --keep-going --product-id=1 --series-name=openmtbmap-srtm-ANTA-13-Apr-2018 --family-name=mtbmap-srtm-ANTA-2018 --overview-mapname=mapsetz --tdbfile 74990034.osm.pbf 74990037.osm.pbf 74990038.osm.pbf I've uploaded the style srtm (though that is largely irrelevant I guess) and the 3 offending pbf files here: https://openmtbmap.org/broken.zip Even though I guess to reproduce you also need the hgt files. I also get this error on a couple of pbf tiles created by splitter and phyghtmap of Russia (and therefore also on Asia continent). I'm not sure if the fault is in the pbf or in the hgt - As I don't know which hgt file would be coressponding here is the command used with phyghtmap - it will download the relevant hgt files. phyghtmap --earthexplorer-user=XXXXX --earthexplorer-password=XXXXX --jobs=6 --polygon=/home/contourlines/bounds/antarctica.poly --step=20 --no-zero-contour --void-range-max=-420 --output-prefix=anta --line-cat=500,100 --start-node-id=10000000 --start-way-id=10000000 --source=view1,view3,srtm3,srtm1 --max-nodes-per-way=230 --max-nodes-per-tile=0 --pbf -- Felix Hartman - Openmtbmap.org & VeloMap.org Schusterbergweg 32/8 6020 Innsbruck Austria - Österreich