[Marble-devel] Questions About Marble Installation

[Paul Carlisle]

Also - how do I check out the latest stable version, as suggested? I've been 
using the trunk, at

   svn://anonsvn.kde.org/home/kde/trunk/KDE/kdeedu/marble

but I don't see any tags other than the KDE 0.8 version.

On Thursday 22 April 2010 03:42:03 Torsten Rahn wrote:
> Hi Paul,
> 
> On Wednesday 21 April 2010 23:34:41 Paul Carlisle wrote:
> > We will very likely be using Marble for an upcoming project that requires
> > the display of a user's position on a map. Resolution will never have to
> > be very high - at the finest, we probably won't have to show an area any
> > smaller than roughly 50 miles on a side. The application will be written
> > in C++ using Qt and the MarbleWidget class, running under Unix.
> 
> Great :-)
> 
> > Unfortunately, this application will almost never have Internet access,
> > so we will be forced to provide a large image, or our own set of image
> > tiles.
> 
> Yes, that would both be possible.
> 
> > After playing with a simple demo program, I note that the Blue Marble
> > dataset only seems to contain a single JPEG image that is 2700x1350
> > pixels. This seems awfully small for the level of detail seen in the
> > zooms. Is it drawing the data from somewhere other than the <install
> > location>/data directory? Or is Marble just using a really good scaling
> > algorithm?
> 
> Marble is fetching more tiles from the internet while you are browsing the
>  map. The data is downloaded to ~/.marble/data by default in all versions
>  up to 0.9.x.
> 
> So I guess you have an internet connection running in the background which
> downloads the data behind your back (it's possible to disable this
>  behaviour btw., so that Marble remains in offline mode). :-)
> 
> > I note in your documentation that the largest image that the widget will
> > automatically tile is 10800x5400. If we choose to download, say, the
> > full- resolution NASA Blue Marble images and provide our own tiles, is it
> > sufficient to simply place the tile directly tree in the data area, or
> > are there additional steps needed to make the application locate the
> > tiles?
> 
> There are no further steps necessary. :-) You can just place the downloaded
> tiles either in the local ( ~/.marble/data ) or system/install directory.
> 
> > Also, what is the recommended way of telling Marble where the data is
> > stored?
> 
> Yes, see the third chapter at:
> http://edu.kde.org/marble/obtain.php
> 
> > Is there an environment variable, or can the path be set at
> > runtime? I'm referring to the widget, not the Marble executable.
> 
> Yes, see the third chapter at:
> http://edu.kde.org/marble/obtain.php
> 
> You might also have a look at the documentation of the MarbleDirs class for
>  a better understanding :-)
> 
> Note also that this stuff has changed in trunk. For development we usually
> recommend to use the stable Marble version (i.e. right now this is 0.9.x).
> But if you should decide to use trunk then you need to be aware of the
>  recent changes (which Bastian could tell more about).
> 
> > We will
> > likely not be given root access when we install our application and data,
> > so we need to be able to configure Marble to look where we will be forced
> > to install.
> >
> > If this project succeeds, we may explore the possibility of building our
> > own Open Street Map server in order to provide the follow-on level of
> > detail some users will want.
> 
> That should work fine with Marble as well.
> 
> > For now, however, high-resolution imagery
> > will probably be sufficient.
> 
> Cool,
> 
> Best Regards,
> 
> Torsten
> 
> > Thank you in advance for your help.
> > _______________________________________________
> > Marble-devel mailing list
> > Marble-devel at kde.org
> > https://mail.kde.org/mailman/listinfo/marble-devel
> 
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