[mkgmap-dev] Question reg. precompiled bounds

Thu Jan 17 08:29:51 GMT 2013

Hi WanMil,

I am picking up some lose ends...

I tried the combination of both programs with europe.osm.pbf dated 2013-01-12:
osmconvert --drop-version europe.osm.pbf -o=europe.o5m
osmfilter osmfilter europe.o5m --keep-nodes= --keep-ways-relations="boundary=administrative =postal_code postal_code=" -o=europe-boundaries.o5m
osmconvert.exe --fake-version europe-boundaries.o5m -o=europe-boundaries.osm.pbf

osmosis.bat --read-pbf file=europe-boundaries.osm.pbf outPipe.0=data1 --read-pbf file=europe-boundaries.osm.pbf outPipe.0=data2 --tag-filter accept-relations boundary=administrative,postal_code inPipe.0=data1 outPipe.0=6 --used-way inPipe.0=6 outPipe.0=7 --tag-filter reject-relations inPipe.0=data2 outPipe.0=8 --tag-filter accept-ways boundary=administrative,postal_code inPipe.0=8 outPipe.0=9 --used-node inPipe.0=9 outPipe.0=10 --used-node inPipe.0=7 outPipe.0=11 --merge inPipe.0=10 inPipe.1=11 outPipe.0=12 --write-pbf file=europe-boundaries2.osm.pbf omitmetadata=true compress=deflate inPipe.0=12

osmconvert.exe europe-boundaries2.osm.pbf -o=eb2.o5m
osmconvert --diff eb2.o5m europe-boundaries.o5m > db.osm

I think the osmosis command drops too much data, for example this relation 
http://www.openstreetmap.org/browse/relation/1610919
is missing in the output of osmosis.

Maybe we should also change mkgmap, for example it ignores this relation
http://www.openstreetmap.org/browse/relation/1598874
which is written by osmfilter, but not by osmosis.

On the other hand, it doesn't ignore buildings like this:
http://www.openstreetmap.org/browse/relation/1569568
which is only written by osmfilter.

I've also created the bounds for each of the files.
- europe-boundaries.o5m gives  *.bnd files with 418.495.744 bytes 
eb2.o5m gives 412.499.832 bytes

Summary: 
I'd prefer running only osmfilter as long as memory is not a problem.

Ciao,
Gerd

> Date: Sat, 12 Jan 2013 16:55:24 +0100
> From: wmgcnfg at web.de
> To: mkgmap-dev at lists.mkgmap.org.uk
> Subject: Re: [mkgmap-dev] Question reg. precompiled bounds
> 
> > Hi,
> >
> > the wiki says that I have two alternatives to extract boundary data from
> > an OSM file, either osmfilter: "fast, resulting files contains some unused
> > stuff that eats memory when precompiling bounds" or osmosis: "slow".
> > What about a combination of both (first osmconvert, than use osmosis to
> > filter the output of osmconvert) ?
> >
> > Ciao,
> > Gerd
> >
> 
> I tried that once but observed problems.
> 
> osmconvert/osmfilter with parameter --drop-author generates pbfs that 
> cannot be read with osmosis 
> (http://wiki.openstreetmap.org/wiki/Talk:Osmconvert#PBF_seems_to_be_incorrect_with_--drop-author). 
> Don't know if that' still the case. Anyhow one could use osmconvert 
> without --drop-author. I also tried that but I did have another problem 
> I don't remember what thas was.
> 
> The unused stuff I saw were subrelations of type=collection. There is a 
> warning in the wiki that they shouldn't be used so I don't know if its 
> usage has dropped.
> 
> Testing the double filter osmfilter/osmosis would be a good thing to see 
> how much stuff is really superfluos when using osmfilter only.
> 
> WanMil
> 
> 
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> mkgmap-dev at lists.mkgmap.org.uk
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