Greg what you mention about paths is particularly true for various regions were
there is almost no road. I see that often in various countries. The link below
shows the Manang valley, Nepal, in the himalyas, where we dont see anything
before zoom level 14.
http://www.openstreetmap.org/#map=10/28.6550/84.0516&layers=H
For these areas, we can say that this is in a sense the main road.
We have the same problem with tracks. For this map portion of Afghanistan, you
see almost nothing at level 9. You have to wait al level 13 to see some tracks.
Then, we can says that we have no perspective.
http://www.openstreetmap.org/#map=9/33.1594/65.5101&layers=H
In this particular case, if there was a hierarchy of roads, it would be less a
problem if the rule that I proposed was followed. See
https://wiki.openstreetmap.org/wiki/Highway_Tag_Africa
An automatic rendering rule will not take care of these particular contexts.
Distance could be one rule, or absence of roads.
Pierre
________________________________
De : Greg Troxel <[email protected]>
À : Martin Koppenhoefer <[email protected]>
Cc : "[email protected]" <[email protected]>
Envoyé le : Mardi 7 janvier 2014 19h17
Objet : Re: [OSM-dev] Renderer issue: highway=service and service=driveway?
Martin Koppenhoefer <[email protected]> writes:
> service roads are there, it is only the driveways which are
> (deliberately I guess) rendered only in high zooms.
I think the real issue is that what should be rendered at highish zoom
is complicated. For a footway that only goes 20m, having it disappear
fairly soon makes sense. But a 3 km footway through a forest is far
more important. Same for driveway, which is not really that inferior to
"service road", but is more important than "parking_aisle".
So to really do this right, I think some notion of characteristic
distance of the way needs to be calculated, and that used in the
suppression decision.
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