[mkgmap-dev] Splitter question

Mon Nov 15 20:28:47 GMT 2010

On Mon, Nov 15, 2010 at 2:03 PM, Danny Backx <danny.backx at scarlet.be> wrote:

> After a *lot* of messages like these :
>
> Node 986712679 in too many areas. Already in areas 0xd0a0706, trying to
> add area 0xe
> Node 986712679 in too many areas. Already in areas 0xd0a0706, trying to
> add area 0x11
> Node 986712679 in too many areas. Already in areas 0xd0a0706, trying to
> add area 0x12
>

The tracking tables used by the old version of the splitter can only track
nodes that occur in at most 4 output files. (To handler borders correctly,
nodes near a region are included in it.) The warnings indicate that nodes
weren't written to a file that they should have been. That's bad.

I suggest using a copy of the splitter generated from the crosby_integration
branch. The code in that branch supports pbf input, runs faster, and doesn't
have this limitation.
http://www.mail-archive.com/mkgmap-dev@lists.mkgmap.org.uk/msg07266.html

> the command
>
> java -jar splitter-r123/splitter.jar --mapid=400 --max-nodes=1000
> --resolution=15 iso-nl-259.osm
>
> did produce 30 output files. This may be too much, so I tried again with
> max-nodes=10000 (and resolution=15). Similar result : 30 output files.
> This time I logged the output via script : > 3 million lines of
> messages.
>

It sounds like the limit is the minimum size of a region. Note that this is
a limitation of the part of the splitter that automatically finds splits. If
areas.list is manually edited, smaller regions can be generated.

You're hitting that minimum-area-size limit at anything under 10,000 nodes.
The only fixes are either increase the resolution, or, for regions
containing too many nodes, edit areas.list file and subdivide the regions
that are too big.

max-nodes=10000 , resolution=14 --> 6 files, "only" 120000 lines of
> output in typescript.
>
> BTW I also tried decreasing max-nodes without changing the resolution,
> this is what Felix wrote. That didn't work : the file never got split
> further.
>
> So how do I describe what to do, in documentation for RoadMap users ?
>

First question is how many nodes can RoadMap handle?

Scott
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