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

Thu Jan 17 15:24:59 GMT 2013

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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