[Marble-devel] Marble with offline OSM maps

[Torsten Rahn]

On Dienstag, 15. Mai 2012 15:31:27 Jeremie Scheer wrote:
> The map installation directory can be in another path than Marble's
> system directory ? My maps will be installed on a SD card that will be
> inserted in the system, so how can I set the map directory to another
> location in the application code ?

Have a look at chapter 3 inside

http://edu.kde.org/marble/obtain.php

which tells you how to change the Marble Data Path at runtime or compiletime 
as you wish. (The same is possible in a similar fashion for plugins.  But 
that's probably not relevant for your case.)

Best Regards,
Torsten

 
> Thank you,
> 
> > Hi Jeremie,
> > 
> > On Dienstag, 15. Mai 2012 14:29:15 Jeremie Scheer wrote:
> >>> You might want to default to Mercator projection in Marble since that
> >>> delivers the best speed.
> >> 
> >> How can you do that ? Is there a method in the code to default to
> >> Mercator ?
> > 
> > See part 2 of the Tutorial I referenced in my previous mail:
> > 
> > http://techbase.kde.org/Projects/Marble/MarbleMarbleWidget
> > 
> > As you can see there is a line
> > 
> >   mapWidget->setProjection( Mercator );
> > 
> > which does this exactly.
> > 
> >>> It's trivially easy to preload the tiled bitmaps
> >> 
> >> Where can you find tiled bitmaps from OSM on the Internet ? Or OSM files
> >> must be transformed to tiled bitmaps with Mapnik first ?
> > 
> > See the user documentation:
> > 
> > http://docs.kde.org/stable/en/kdeedu/marble/download-region.html
> > 
> > You can use the normal Marble client to download bitmap tile data right
> > from the OpenStreetMap servers.
> > 
> > Note that there are OSM server restrictions to the download of a single
> > query (Marble's UI will inform you about those).
> > 
> > Make sure that the hard disc cache is big enough so that Marble will not
> > automatically start to delete the data you are downloading. By default it
> > measures around 300 MB which you might want to increase depending on the
> > amount of data you want to keep:
> > 
> > http://docs.kde.org/stable/en/kdeedu/marble/configcacheproxy.html
> > 
> > The data for OSM will end up inside
> > 
> > ~/.local/share/marble/maps/earth/openstreetmap
> > 
> > You can either copy it into the very same place on your target device -
> > or - you put it into the system wide place which might be e.g.:
> > 
> > /usr/local/share/marble/data/maps/earth/openstreetmap
> > 
> > (start Marble with "marble --debug-info" on the command line and look for
> > the first few lines of output which looks like this:
> > System Path: "/usr/local/share/apps/marble/data"
> > This will tell you the correct place for your system data where
> > "maps/earth/openstreetmap" needs to get created inside )
> > 
> > If you keep it in the home directory on the target device then you also
> > need to apply the cache limit settings on the MarbleWidget used on the
> > device - otherwise Marble will delete excessive data automatically. So
> > putting it into the System Path might be the better solution.
> > 
> > Of course the alternative would still be to create bitmap tiles via
> > Mapnik on demand on your own server. That would require some additional
> > magic on your own server however.
> > 
> >> Now if I have tiled bitmaps, how can I use them in Marble library being
> >> offline ?
> > 
> > You can use it right away if it's placed in the correct location on your
> > hard disc. See above. :-)
> > 
> > Best Regards,
> > 
> > Torsten
> > 
> >> Regards,
> >> 
> >>> Am 15.05.2012 12:29, schrieb Torsten Rahn:
> >>>> As you can see there are still a few things missing (road labels,
> >>>> etc.) but we gladly accept patches ;) Note that Marble currently only
> >>>> support import of single files. So there is no "tile management" as
> >>>> it exists for the OSM bitmap map theme.
> >>>> 
> >>>>> Is it possible to do that with Marble ? And if so, could you explain
> >>>>> me the way it can be done (directly by code and not in Marble menus)
> >>>>> ?
> >>> 
> >>> It's also useful to know that there's a GSOC project this year by
> >>> Ander that will further improve our OSM vector rendering towards
> >>> making it end-user ready.
> >>> 
> >>> Regards,
> >>> Dennis
> >>> 
> >>> _______________________________________________
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> >>> Marble-devel at kde.org
> >>> https://mail.kde.org/mailman/listinfo/marble-devel
> >> 
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> > 
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