[mkgmap-dev] Map size increase using osmupdate vs download

Thu Jan 17 15:29:29 GMT 2013

Hi Eric,

yes, I think so. You may contact Markus Weber,the author of osmupdate and osmconvert:
markus.weber at gmx.com
Maybe he can change osmupdate so that it uses the bounding box of the original file
to clip the data by default.

Ciao,
Gerd

> Date: Thu, 17 Jan 2013 15:24:59 +0000
> From: zeb at zebulon.org.uk
> To: mkgmap-dev at lists.mkgmap.org.uk
> Subject: Re: [mkgmap-dev] Map size increase using osmupdate vs download
> 
> Hi Gerd,
> 
> Thanks a lot for the -B switch. I read the wiki page about osmupdate,
> but did not understand exactly the use of it. Now it is clear! If I
> understand well what you are saying, I was merging the GB map with
> changes made in the whole world! Am I correct?
> 
> Best,
> Eric
> 
> 2013/1/17 Gerd Petermann <gpetermann_muenchen at hotmail.com>:
> > Hi Eric,
> >
> > you have to add
> > -B=great_britain.poly
> > to your options. See http://download.geofabrik.de/clipbounds/
> >
> > else osmupdate will add all changes that were made to the whole planet.
> > Probably, you also need something like
> > --complete-ways --complete-ways
> >
> > to avoid broken ways in your updated file. These parms are passed to
> > osmconvert.
> >
> > See also http://wiki.openstreetmap.org/wiki/Osmupdate
> >
> > Ciao,
> > Gerd
> >
> >> Date: Thu, 17 Jan 2013 15:06:50 +0000
> >> From: zeb at zebulon.org.uk
> >> To: mkgmap-dev at lists.mkgmap.org.uk
> >> Subject: Re: [mkgmap-dev] Map size increase using osmupdate vs download
> >
> >>
> >> 2013/1/17 Gerd Petermann <gpetermann_muenchen at hotmail.com>:
> >> > Hi Eric,
> >> >
> >> > what options do you use to update your map? If you download eg.
> >> > germany.osm.pbf and later
> >> > execute osmupdate.exe without a germany.poly you add all changes of
> >> > planet
> >> > to your
> >> > osm file.
> >> >
> >> > Does that help?
> >> > Gerd
> >> >
> >>
> >> Hi Gerd,
> >>
> >> Yes, I used:
> >> ./osmupdate -v great_britain_previous.o5m great_britain.o5m
> >> as well as:
> >> ./osmupdate -v great_britain_previous.osm.pbf great_britain.osm.pbf
> >>
> >> The problem is, if I update a one-day old map (downloaded from
> >> Geofabrik), the size of the new, updated map is significantly higher
> >> than the same map from Geofabrik the day after. Tomorrow I'll try some
> >> tests with today's great britain map to demonstrate this.
> >>
> >> Eric
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