[OSM-talk] Mulltipolygons and Mapnik

[Chris Hill]

I've worked with islands before.  It seems that the key points are:
1. make sure that the same tag is used on the inner and outer, in this 
case natural=water
2. Make sure that the outer is clockwise and inner(s) are anticlockwise

I took the liberty of changing the islands to match their outer so I 
expect it to render.

Cheers, chris

Dermot McNally wrote:
> 2008/5/23 Ludwig <ludwigbrinckmann at gmail.com>:
>   
>> The holes, at least for my example, are land (so natural=land).
>>     
>
> It's not what's causing the problem, but to me that's just incorrect.
> Valid tagging to me could be:
>
> Untagged: It's just a hole in whatever its parent polygon is.
> Tagged water: It's a hole in something that is water, so it identifies
> itself as a "water hole"
>
> To tag it as land _and_ make it part of a multipolygon seems to be a
> double negative.
>
> Dermot
>
>