[mkgmap-dev] Commit r3702: sortAreas_v5.patch: Addoption--order-by-decreasing-area

Sun Nov 13 09:21:05 GMT 2016

I still think the best solution would be cutting out smaller polygons from
larger - however we would need to define two categories in the polygons
style-file:
1. polygons that are used transparently in .typ (and will be given high
draworder anyhow) - these can be skipped. Also usually very small polygons
that you give high draworder (e.g. buildings) don't need to be cut out.
It's easier if they simply appear on top.
2. Other polygons which usually cover large areas - here overlapping
smaller polygons should be cut out.

Looking at area size of polygons of all polygons that fall under 2. will be
needed of course. But because of 1. we will save time as any polygon that
is flagged as belonging to 1. category can be skipped. Main problems are
anyhow forest, water, island and similar where people are too lazy to use
multipolygons.

Even though wrong tagging - looking at the layer tag if present to decide
which polygon should be cut out should still be done.

On 13 November 2016 at 09:47, <rheinskipper1000 at gmx.de> wrote:

> Yes, I would appreciate a draw order command for the style language very
> much.
>
>
>
>
>
>
>
> *Von: *Gerd Petermann <gpetermann_muenchen at hotmail.com>
> *Gesendet: *Sonntag, 13. November 2016 08:22
> *An: *mkgmap-dev at lists.mkgmap.org.uk
> *Betreff: *Re: [mkgmap-dev] Commit r3702: sortAreas_v5.patch:
> Addoption--order-by-decreasing-area
>
>
>
> Hi,
>
>
>
> I am not sure regarding the sizes of the area. At least one of the
> riverbank
>
> polygons is a
>
> multipolygon with two outer rings. The size calculation treats each outer
>
> ring separately, without
>
> subtracting the area of inner rings.
>
> @Ticker: Is that intended?
>
>
>
> Besides that I think that the examples show that one needs both a draw
> order
>
> for types and size ordering to get reasonable results.
>
>
>
> Gerd
>
>
>
>
>
> rheinskipper1000 wrote
>
> > I eagerly awaited the order-by-decreasing-area option.
>
> >
>
> > Results are a bit different than I expected at the moment:
>
> >
>
> > My style contains:
>
> >
>
> > waterway=riverbank [0x10302 resolution 20]
>
> > seamark:type=fairway {name 'fairway'}  [0x10307 level 2]
>
> >
>
> > Unfortunately the smaller (white) fairway polygons are still partly
>
> > covered by (blue) riverbank polygons:
>
> > https://mega.nz/#!NN8UWDCK!LeR_h1cJeBVDGMxFeUf48l_qARfVdKXTMzRoHjy_rEw
>
> > https://mega.nz/#!0B9AgZQJ!AZcQ9zHktIQ0D9Uq_nb_gRGG0eDGxCQaT0XuQJaebWc
>
> >
>
> >
>
> >
>
> > Von: svn commit
>
> > Gesendet: Freitag, 11. November 2016 17:11
>
> > An:
>
>
>
> > mkgmap-svn at .org
>
>
>
> > ;
>
>
>
> > mkgmap-dev at .org
>
>
>
> > Betreff: [mkgmap-dev] Commit r3702: sortAreas_v5.patch: Add
>
> > option--order-by-decreasing-area
>
> >
>
> > Version mkgmap-r3702 was committed by gerd on Fri, 11 Nov 2016
>
> >
>
> > sortAreas_v5.patch: Add option --order-by-decreasing-area
>
> >
>
> > Patch by Ticker Berkin, slightly modifed
>
> >
>
> >
>
> > http://www.mkgmap.org.uk/websvn/revision.php?repname=mkgmap&rev=3702
>
> > _______________________________________________
>
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>
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>
> > mkgmap-dev at .org
>
>
>
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>
> >
>
> >
>
> > _______________________________________________
>
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> > mkgmap-dev at .org
>
>
>
> > http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev
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>
>
>
>
>
>
>
>
>
> --
>
> View this message in context: http://gis.19327.n8.nabble.
> com/Commit-r3702-sortAreas-v5-patch-Add-option-order-by-decreasing-area-
> tp5885761p5885809.html
>
> Sent from the Mkgmap Development mailing list archive at Nabble.com.
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-- 
Felix Hartman - Openmtbmap.org & VeloMap.org
Schusterbergweg 32/8
6020 Innsbruck
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