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

Thu Jan 17 16:19:36 GMT 2013

Thanks,

This looks tedious to implement indeed. Using the poly file works well so far.

Best,
Eric

2013/1/17 Gerd Petermann <gpetermann_muenchen at hotmail.com>:
> Hi Eric,
>
> yes and no. One could calculate a polygon with a given maximum of points,
> but the original extract
> from geofabrik contains nodes that lie outside of the bounding polygon.
> This is because they try to keep ways complete, and some ways are very, very
> long.
>
> Gerd
>
>> Date: Thu, 17 Jan 2013 15:42:11 +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,
>>
>> 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
>> >> >> _______________________________________________
>> >> >> mkgmap-dev mailing list
>> >> >> mkgmap-dev at lists.mkgmap.org.uk
>> >> >> http://lists.mkgmap.org.uk/mailman/listinfo/mkgmap-dev
>> >> >
>> >> > _______________________________________________
>> >> > mkgmap-dev mailing list
>> >> > mkgmap-dev at lists.mkgmap.org.uk
>> >> > http://lists.mkgmap.org.uk/mailman/listinfo/mkgmap-dev
>> >> _______________________________________________
>> >> mkgmap-dev mailing list
>> >> mkgmap-dev at lists.mkgmap.org.uk
>> >> http://lists.mkgmap.org.uk/mailman/listinfo/mkgmap-dev
>> >
>> > _______________________________________________
>> > mkgmap-dev mailing list
>> > mkgmap-dev at lists.mkgmap.org.uk
>> > http://lists.mkgmap.org.uk/mailman/listinfo/mkgmap-dev
>> _______________________________________________
>> mkgmap-dev mailing list
>> mkgmap-dev at lists.mkgmap.org.uk
>> http://lists.mkgmap.org.uk/mailman/listinfo/mkgmap-dev
>
> _______________________________________________
> mkgmap-dev mailing list
> mkgmap-dev at lists.mkgmap.org.uk
> http://lists.mkgmap.org.uk/mailman/listinfo/mkgmap-dev