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[mkgmap-dev] crash. Too many tiles?

From Johann Gail johann.gail at gmx.de on Sat Jan 29 11:53:37 GMT 2011

Hi Valentjin,

IIRC then there are some limitiations in the format, which don't allow 
more than 256 tiles in one img file.
There should be no exception but a clear error message, but I think it 
would not work anyway.


Valentijn Sessink schrieb:
> Hi list,
> This should have been a bit of an experimental map, with as much tiles
> as possible, by having splitter do --max-nodes=150000
> In the end, however, I don't get a map at all:
> java -enableassertions -Xmx1700m -jar ../mkgmap/dist/mkgmap.jar
> --make-opposite-cycleways --mapname=31000068 --latin1
> --remove-short-arcs=2.8 --reduce-point-density=5.4 --lower-case --route
> --preserve-element-order --max-jobs --location-autofill=1
> --link-pois-to-ways --description=Nederland --style=1430
> --family-name="Openstreetmap 29 jan 11" --series-name=OSM-Valentijn
> --gmapsupp --tdbfile --net -c template.args
> Exception in thread "main" java.lang.IllegalArgumentException
>         at java.nio.ByteBuffer.allocate(ByteBuffer.java:311)
>         at uk.me.parabola.imgfmt.sys.Directory.sync(Directory.java:176)
>         at uk.me.parabola.imgfmt.sys.ImgFS.sync(ImgFS.java:230)
>         at uk.me.parabola.imgfmt.sys.ImgFS.close(ImgFS.java:240)
>         at
> uk.me.parabola.mkgmap.combiners.GmapsuppBuilder.onFinish(GmapsuppBuilder.java:119)
>         at uk.me.parabola.mkgmap.main.Main.endOptions(Main.java:413)
>         at
> uk.me.parabola.mkgmap.CommandArgsReader.readArgs(CommandArgsReader.java:126)
>         at uk.me.parabola.mkgmap.main.Main.main(Main.java:127)
> This is in the Netherlands, so nodes all over the place, and in fact,
> I'm getting lots and lots of "Area (51.8994140625,6.6357421875) to
> (52.0751953125,6.8994140625) contains 209.578 nodes but can't be split
> further" messages. The resulting cut has 265 tiles.
> A few weeks ago, I remember having made such a map - but that could just
> be because there were a bit fewer nodes somewhere and the number of
> tiles was below 256 - could just be, I don't know.
> (The reason for this many tiles was the idea that a Nüvi might get
> better bike performance on long distances if the number of data to
> unpack (i.e. individual tiles) would be smaller - because of the smaller
> tiles. Might be just a stupid idea, I don't know, I was going to check
> but we might never know now... ;)
> So I'm just passing this on, for the sake of it, don't look too long at
> it because it's probably not worth it; but if there's an easy fix, it is
> welcome ;-)
> Best regards,
> Valentijn
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> mkgmap-dev at lists.mkgmap.org.uk
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