[Marble-devel] Map Processing Question

[Torsten Rahn]

Hi Danuvius,

On Friday 10 October 2008 06:34:37 Danuvius wrote:
> I think Yanns suggestion more or less point me in the right direction for
> creating my map/map-overlay... although I am not feeling like it is going
> to be exceedingly easy (for me at least).  I suspect it will take a great

Great. Looks like this list is attracting more and more knowledgeable people 
and helping hands :-)

> Your tutorial on making Marble maps is great though!  Once I actually have
> a map, I believe I shall try. ;-) 

Any advice or additions would be appreciated. That of course applies to 
everyone on this list :-)

Unfortunately we are busy enough with coding already so if you -- or somebody 
else on this list -- can dedicate some time on feedback or even improving our 
tutorials that would be just awesome and we'll try our best to credit your 
help appropriately.

If you think you can add something then maybe the techbase Wiki would be a 
good start where you could add your own thoughts:

http://techbase.kde.org/Development/Tutorials/MarbleWidget

> Would you or Yann be able to recommend me a good (and novice-targeted...
> nay, total beginner targeted) GIS tutorial?

Unfortunately I don't have much of an advice (but I'm pretty sure that 
something like this does exist).

If nobody else here can help you can of course try and ask on #qgis (which is 
the IRC channel of the free QGIS tool). 
Marble after all is not meant to be a GIS tool but just a convenient and light 
virtual globe. Although it would surely be nice if someone took the widget and 
would try to create a simple GIS tool based on it (I always dub this separate 
project that would yet need to be started "Cartographer") ....

Best Regards,

Torsten

> Sincerely,
>
> Danuvius
>
> On Mon, Oct 6, 2008 at 12:43 PM, Torsten Rahn <rahn at kde.org> wrote:
> > Hi,
> >
> > On Monday 06 October 2008 05:26:42 Danuvius wrote:
> > > Greetings, lofty KDE Marble Devs!
> > >
> > > Can anybody advise me on how I could programmatically create an overlay
> >
> > (to
> >
> > > work with Marble) consisting of a 10 km "coastal band"?
> >
> > Not easily. We are right now working on getting KML Polygons working in
> > SVN.
> > That way it should become possible to create a KML outline /
> > semitransparent
> > polygon. However of course you'd need to generate the vector polygons
> > somehow
> > yourself.
> >
> > I'd also like to add bitmap overlays but I guess we won't be able to
> > deliver
> > that feature for KDE 4.2.  :-(
> >
> > > Basically I want to highlight--as precisely as can be done--all land
> > > that is less than 10 km from the ocean or ocean-connected seas. 
> > > (Basically
> >
> > the
> >
> > > two "inland" Asian seas do not count, nor do lakes and rivers.)  Doing
> >
> > this
> >
> > > with a flat map is difficult enough (although I have done it)...
> >
> > Well, how have you done it before? Using bitmaps?
> >
> > > If this is basically impossible, can somebody suggest some way to
> > > achieve the same ends?  Arguably an impractically huge (highest
> > > resolution Blue Marble size) political map would do the trick.  I
> > > already have a Python program that can create such a highlight layer
> > > from a properly
> >
> > preprocessed
> >
> > > Robinson projection map.  But as far as I can tell, sufficiently high
> >
> > Well the "default" source projection for bitmaps is plate carree / the
> > equirectangular projection.
> >
> > If you haven't done so you might want to have a look at my blog series
> > which
> > might serve as a technical introduction to Marble:
> >
> > http://www.kdedevelopers.org/node/3269
> > http://www.kdedevelopers.org/node/3272
> > http://www.kdedevelopers.org/node/3275
> >
> > (however I'm not sure whether it's useful for your question)
> >
> > Regards,
> >
> > Torsten
> >
> > > resolution political maps don't exist outside of Marble, Google
> >
> > Maps/Earth,
> >
> > > NASA's Worldwind and similar programs.
> > >
> > > I would be immensely grateful if somebody could point me in the right
> > > direction.
> > >
> > > Respectfully,
> > >
> > > Danuvius
> >
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