Thanks, This looks tedious to implement indeed. Using the poly file works well so far. Best, Eric 2013/1/17 Gerd Petermann <gpetermann_muenchen@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@zebulon.org.uk To: mkgmap-dev@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@hotmail.com>:
Hi Eric,
yes, I think so. You may contact Markus Weber,the author of osmupdate and osmconvert: markus.weber@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@zebulon.org.uk To: mkgmap-dev@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@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@zebulon.org.uk To: mkgmap-dev@lists.mkgmap.org.uk Subject: Re: [mkgmap-dev] Map size increase using osmupdate vs download
2013/1/17 Gerd Petermann <gpetermann_muenchen@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.
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