[OSM-talk] mapnik riverbank problem

[Frank Sautter]

Alex Mauer schrieb:
> The large cluster of islands within a riverbank visible here on the 
> osmarender layer:
> 
> http://www.informationfreeway.org/?lat=44.559416836708124&lon=-89.63008108668645&zoom=14&layers=B0000F000F
> 
> 
> ...does not show up properly on Mapnik.  As far as I can tell, it's 
> tagged entirely correctly.
> 
> I've managed to get a few islands to render correctly by loading and
>  then saving them without making any actual changes.
> 
> Is there something weird with mapnik where the order in which the 
> ways are stored in the database would matter?

> On Mon, 2009-03-09 at 13:47 +0100, Frank Sautter wrote:
>> i have the suspicion that this appeared to happen since mapnik is 
>> rendering data after a few hours instead of the old weekly renderer
>> run. in all cases, parts of the multipolygons have been touched,
>> but not all.

Jon Burgess wrote:
> You are correct, the hourly diff imports can not handle the
> multipolygon relation properly. These will fix themselves after the
> weekly import each Wednesday. Any edit to the nodes or ways in the
> relation will probably break it again.
> 
> Overall the benefits of the hourly import far outweigh the slight 
> problems with the multipolygon handling.

frank