[mkgmap-dev] Proof of concept for better sea in overview map

Mon Jun 7 10:55:41 BST 2021

Is it only much slower because of not using precomp sea? Or will it be much
slower in general? And what is much slower for say Europe continent map? If
a modern 4core/8thread processor needs 30 minutes more I would prefer the
old way knowing it is worse (if the time difference is negligible with
precomp-sea then that would be great).

On Mon, 7 Jun 2021 at 12:26, Ticker Berkin <rwb-mkgmap at jagit.co.uk> wrote:

> Hi Gerd
>
> This is going to take some studying to work out the implications. Can't
> do much for the next few days however, but will look carefully at the
> end of the week.
>
> Ticker
>
> On Sun, 2021-06-06 at 14:02 +0000, Gerd Petermann wrote:
> > Hi,
> >
> > the attached patch improves the overview map, but so far only when
> > precomp-sea is NOT used.
> > I tested it with --generate-sea=multipolygon,floodblocker  so that
> > mkgmap really has a multipolygon with the natual=sea data.
> >
> > For each level in the overview map it uses the original multipolygon
> > data to compute the rings which will might visible at the given
> > resolution. This requires more time compared to the current code but
> > the result is much better and some fine tuning is possible.
> >
> > To be able to use this also with --precomp-sea we need some changes
> > in the code which generates sea.zip so that one multipolygon relation
> > for each tile is stored.
> >
> > I've uploaded the results here:
> > https://files.mkgmap.org.uk/download/511/compare.7z
> > What do you think?
> >
> > Gerd
> >
> >
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> > mkgmap-dev at lists.mkgmap.org.uk
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-- 
Felix Hartman - Openmtbmap.org & VeloMap.org
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