[mkgmap-dev] Fwd: OpenStreetMap e-mail - mkgmap bug report

Thu Jul 9 15:19:18 BST 2009

Hi Valentijn,

I grabbed the source as you suggested but could not successfully create
a map when the splitter had max-nodes = 1000000. One of the tiles
failed in mkgmap (exception - NET1 offset too big, I think).

I tried again with max-nodes = 500000 and now I have a complete map.

Looking at it using mapsource, the area you reported problem with looks
fine. 

Can you load your broken map into mapsource and see if it is also
broken there?

Also, could you try re-building with the smaller value of max-nodes and
see if that changes anything.

Cheers,

Mark

 On Thu, 09 Jul 2009 11:01:08 +0200
Valentijn Sessink <valentyn at blub.net> wrote:

> Hi Mark,
> 
> (Let me introduce myself: hi, I'm the original problem submitter :)
> 
> Mark Burton schreef:
> > Well, that's a bit odd. If you download this area into
> > JOSM, it looks similar(ish) but by no means exactly the same.
> 
> Yep, that's what I did last night: open just the area around the problem
> site and it shows like it should in my Garmin. And what's more: running
> splitter like in my script, then just building a map of the isolated map
> number 1 produces the same results, while JOSM shows the correct map.
> 
> The A27 highway in this area also disconnects. I did not picture this
> fact, but  on my garmin, there's a gap in the bridge.
> 
> But now, after more checking, we have a winner! Using the same OSM file,
> with --routing enabled will produce a map with gaps; having --routing
> disabled will show a map with correctly connected ways.
> 
> So the right map is produced with:
> java -Xmx$memory -jar mkgmap*/mkgmap.jar --country-name=Nederland
> --country-abbr=NL --latin1 --lower-case --preserve-element-order
> --location-autofill-1 --gmapsupp --net 10000001.osm.gz
> 
> And the wrong map is produced by:
> java -Xmx$memory -jar mkgmap*/mkgmap.jar --country-name=Nederland
> --country-abbr=NL --latin1 --lower-case --route --preserve-element-order
> --location-autofill-1 --gmapsupp --net 10000001.osm.gz
> 
> Gentlemen, start your engines! (You won't know where to route, but do we
> care? ;)
> 
> If you're interested in the OSM file I'm using, I could mail it to you,
> but you could also easily build it yourself:
> wget 'http://download.geofabrik.de/osm/europe/netherlands.osm.bz2'
> bunzip2 netherlands.osm.bz2
> java -Xmx$memory -jar $SPLITTERPATH/splitter.jar --max-nodes=1000000 \
>    mapid=10000000 netherlands.osm
> 
> Then use 10000001.osm.gz to build your map.
> 
> Best regards,
> 
> Valentijn
> -- 
> Durgerdamstraat 29, 1507 JL Zaandam; telefoon 075-7074579
> 
> -- 
> Durgerdamstraat 29, 1507 JL Zaandam; telefoon 075-7074579
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