Hi Kevin, Given that your rendering generally looks good, I'd assume the difference you are seeing is simply a difference in the data, not your mapnik install or your stylesheet.
If you grabbed your data from cloudmade, it may be a week or two behind, and this change could be making the difference: http://www.openstreetmap.org/browse/changeset/6559377 Re: a doc/wiki/etc explaining the OSM map style... well, the osm.xml is enormous and complicated. I think the best way to learn how it works is not study it, but the pieces that make it up - so topics like Mapnik Layers, PostGIS datasource parameters, Zoom-dependent rules (min/max scale denominators), and how styles are attached to layers. The kind of pieces of info that should be linked from here: http://trac.mapnik.org/wiki/LearningMapnik if they are not already. That said, for a first cut to understand how the elements of the osm.xml work: like layer ordering, which styles do text, casings, or features, and how the heck to find a rule that renders something... the most useful thing for me has been the mapnik viewer: http://trac.mapnik.org/wiki/MapnikViewer It is not terribly easy to build, but in trunk I've been working on making it slightly easier. Let me know what platform you are on and I can advise a bit more on how to get it running. Dane On Dec 9, 2010, at 5:14 PM, Kevin Collins wrote: > Hi! > > I've been working with Mapnik, enjoying it, and having some success... > except, I'm failing to generate the same green/preserve areas > openstreetmap.org has despite an unmodified-from-svn osm.xml file, for > example -> > > http://liquidcycles.com/osm-rendering-of-marin-headlands.png > http://liquidcycles.com/attempt-to-copy-osm-rendering-of-marin-headlands.png > > (This is the peninsula just north of San Francisco if that helps at all) > > Zooming out, is there an intro doc/wiki/etc to navigating/modifying the > default OSM map-styling? I'm finding it tricky to relate specific Rule and > Filter blocks to the tiles/images being generated. I've had good success > querying the planet_osm_nodes table to find tags for a given point, but > as-of-yet unable to replicate this trick for polygons (which I suspect the > problem above may involve). > > If not, I can add/write a doc as I learn :) > > Thanks in advance for any help! > > Kevin > _______________________________________________ > Mapnik-users mailing list > [email protected] > https://lists.berlios.de/mailman/listinfo/mapnik-users
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