[OSM-dev] Mapnik rendering of leisure=park + landuse=* relations

[Matthias Julius]

Dan Homerick <danhomerick at gmail.com> writes:

> That's not true with the Mapnik renderer. As I said in my original
> email, parks have a transparency less than 1 (or 255, depending on
> what range you're using) -- that is, they are not fully opaque. So a
> park which overlays a landuse does not obscure the landuse, it merely
> alters the coloration some. The woods do not disappear below. The
> reverse, when landuses overlay parks, does result in the park being
> obscured, since landuses are fully opaque.

I have a problem with semi-transparent areas because it leaves the
colors somewhat undefined.

What do you put on a map key?  Woods, woods inside a park, woods
inside a military area, woods inside ...?  I think this makes the map
style overly complex for the viewer.

IMHO, for most such areas (like national parks) the rendering of the
border is enough.  For others (like military areas) I would use a
hatching.

Matthias