[OSM-talk] When will the next mapnik coastline update be?
stevagewp at gmail.com
Thu Dec 10 16:34:16 GMT 2009
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?
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:
>> 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:
> 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.
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