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

Thu Jan 17 15:42:11 GMT 2013

Hi Gerd,

I see what you mean: would it be possible to "rebuild" a poly file
from an osm file?

Eric

2013/1/17 Gerd Petermann <gpetermann_muenchen at hotmail.com>:
> 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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