[OSM-dev] Detailed Coast display in Mapnik

Brent Easton b.easton at exemail.com.au
Wed Aug 15 06:00:11 BST 2007


Hi Cameron,

>Mapnik uses only external data (world_boundaries.tar.bz2, linked to on
>the wiki) to render coastlines - the stuff you draw in as
>natural=coastline is ignored completely.  I'm not sure why the data
>breaks when you zoom in some areas (such as Australia, but people have
>also complained about it in other countries).

?????

There must be more too it than that.

Have a look at this area around Plymouth UK:

http://www.openstreetmap.org/?lat=50.34800311344643&lon=-4.151113641491551&zoom=12&layers=B0F

and here is a similiar area on the NSW South Coast that I did prior to the last Mapnik update:

http://www.openstreetmap.org/?lat=-34.702765184192536&lon=150.92087425524562&zoom=12&layers=B0F


The sea appears blue correctly at zoom 9, but does not appear at higher zoom levels. Someone must have done 'something' to fix the coast display in the UK.

Or is it a problem with the coastline data used by Mapnik? I tried to import some of it manually, but it was terrible. I used Lakewalker instead and got a quite good result.

Regards,
Brent.
____________________________________________________________
Brent Easton                       
Analyst/Programmer                               
University of Western Sydney                                   
Email: b.easton at uws.edu.au





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