[Marble-devel] Map Processing Question

[Danuvius]

Hi, Torsten!

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 deal
of work to take the hugely detailed map Yann recommended and turn it into
something that looks good too.

Your tutorial on making Marble maps is great though!  Once I actually have a
map, I believe I shall try. ;-)  I suspect I will learn all sorts of things
throughout this little cartographic adventure of mine that I may never use
again--but let that be my greatest worry, and I shall surely die a happy
man!

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

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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