[mkgmap-dev] multipolygons: how to flag role=inner role=outer in Style file?

Sat Feb 27 20:10:33 GMT 2010

Well then just put
natural=water & role=inner [0x.. type from land instead of water).
natural=water [0x type of water]

Previous versions were often incorrect when it came to multipolygons. 
which openmtbmap version worked last?
(because current version to mkgmap svn no relevant mp changes were done).

On 27.02.2010 20:22, Minko wrote:
> Thanks Marko,
>
> The tag natural=water is not assigned to the relation (only type=multipolygon)
> so this is not working.
>
> Is it possible to write a condition for role=outer&  natural=water
> { apply role=inner { set natural=land
> } } ??
>
> Here another example of that kind of relation:
> http://maps.google.de/maps?f=q&hl=de&geocode=&q=http://betaplace.emaitie.de/webapps.relation-analyzer/downloadServlet/kml/1525&ie=UTF8
>
> The red way (island) is flooded in my map (and other osm maps as well).
>
> What I noticed is that on other maps (radfahrer, openmtb) which were made with previous versions of mkgmap
> those islands were not flooded, but now they are. So it was somehow possible, but how?
>
> Regards,
> Minko
>
>
> Marko Mäkelä wrote:
>
> Something like this (not tested) in the relations file of your style
> should do the trick:
>
> type=multipolygon&  natural=water { apply role=inner { set natural=land
> } }
>
> This will assign natural=land to each inner member of multipolygon
> relations.
>
> As far as I understand, it is not possible to write other conditions
> for the apply than role. And you cannot match role by regular
> expression. In this case, you cannot add a condition that you only want
> to set natural=land for those inner members that had natural=water.
>
> I do not know when the custom multipolygon processing kicks in. It
> could be that the style rules are executed after that, and it is too
> late to adjust anything with style rules.
>
> Best regards,
>
>          Marko
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