[OSM-talk] Mulltipolygons and Mapnik

[Chris Hill]

Dermot McNally wrote:
> 2008/5/23 Chris Hill <chillly809 at yahoo.co.uk>:
>   
>> 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.
>>     
>
> It's worth a try, and we'll know in a week, but I'm not so sure this
> will cure the problem. Otherwise, how do you explain the island that
> already was tagged the same but still didn't render on the mapnik
> layer? I'm also about 90% sure that I've seen untagged islands with an
> inner role in the relations showing up OK in the past.
>
> Regardless, we need to decide:
>
> * What version of this tagging we think _should_ be considered correct.
> * Ensure both main renderers will accept the "valid" form.
> * Adapt the wiki as required to reflect reality
>
> Dermot
>
>   
it is possible that multiple holes (islands in this case) don't render 
properly.  All of the islands I've drawn have only had a single island 
in each body of water.  Let's see what happens ...

Cheers, Chris