[OSM-talk] Nested areas
steve at nexusuk.org
Fri Jun 6 10:58:53 BST 2008
On Thu, 5 Jun 2008, spaetz wrote:
> Why should it work differently? If I want a tunnel under a forest, a
> layer=-1 *should* draw the tunnel under the forest.
It isn't in a tunnel though - if it was, it would have tunnel=yes.
layer=-1 is often used for waterways for a couple of reasons:
1. It indicates it is below the _general_ level of the local ground (note:
this does not imply it is a covered tunnel)
2. It means that ways which pass over the top don't need to explicitly be
moved to a higher layer, which makes editing easier.
I don't think areas, such as landuse, natural, etc. should be considered
as something physically laid on top of the land - they merely describe the
use of the land within them and thus should not obscure other objects any
more than the land itself should.
If the land itself isn't obscuring objects, why should an area tag, which
effectively just describes some properties of that land.
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