Re: [Flightgear-devel] Re : Landcover Contribution

[Curtis O. <cur...@gm...>]

Just to be clear -- I understand where you are coming from now.  But this
is an issue of choosing which data sets to include in a world build, and
not so much of an algorithm/code issue.

Regards,

Curt.
On Mar 13, 2012 10:50 AM, "Martin Spott" <Mar...@mg...> wrote:

> Curtis Olson wrote:
>
> > I'm not sure why not having a landmass is a neat side effect?  That was
> > simply a catchall for covering areas not covered by other data -- I could
> > only see that causing problems if the input is not topologically
> consistent.
>
> ....  indeed, which is the case with stock VMap0.
>
> Regarding the neat side effect: When you aim at replacing the rather
> coarse VMap0 by detailed custom land cover in coastal regions, then you
> have to do *something* about the landmass.  As long as you rely on
> having a landmass, adjusting this to the new, detailed land cover is a
> requirement, because otherwise you'll loose the accuracy of your new,
> shiny coastline.
>
> Imagine how long it took me to manually remove the remains of VMap0
> after inserting John's custom land cover just at this rather small
> place here:
>
>
> http://mapserver.flightgear.org/map/?lon=-71.41411&lat=41.57204&zoom=11&layers=B0000000FFFFFFFFTFFFFFFF
>
> ....  and then think about how long it would take to adjust the
> landmass accordingly.  Therefore I preferred to fill the voids in VMap0
> just one single time and to deal with topologically clean data only
> from this moment.
>
> Cheers,
>        Martin.
> --
>  Unix _IS_ user friendly - it's just selective about who its friends are !
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