[OSM-talk] When will the next mapnik coastline update be?

[Steve Bennett]

Thank you! Does "the data is made available to the Mapnik renderer as
a large shapefile (processed_p) which is generated every few weeks
from planet dumps. " still hold true?

Steve

On Fri, Dec 11, 2009 at 3:11 AM, Peter Körner <osm-lists at mazdermind.de> wrote:
> Steve Bennett schrieb:
>>
>> So, my hard work tagging beaches and moving the coastline looks like crap:
>> http://osm.org/go/uG4E@BCC
>>
>> Anyone know how long it's likely to be until the next coastline update
>> is taken into account by Mapnik?
>>
>> (For bonus marks, can anyone explain what's special about coastlines,
>> and why this happens?)
>
> The almighty wiki can:
>
> http://wiki.openstreetmap.org/wiki/Coastline
>
> The main problem of showing coastlines from OSM data is that Mapnik really
> needs closed polygons. The polygon can (and normally should) be made of
> several ways, but the ways should join end-to-end and eventually loop back
> round without interruption, to close the polygon. An imperfect coastline
> with many small gaps, reversed ways and other defects will cause the polygon
> to break, and the coastline to be rendered incorrectly . One of the features
> of the Coastline error checker is to try and join coastlines in such a way
> as to make high-quality coastlines even with these imperfections. As the
> coastlines are uploaded and completed the quality can be checked.
>
> Peter
>