Hi,
As followup for:
http://forum.openstreetmap.org/viewtopic.php?id=55457
https://github.com/gravitystorm/openstreetmap-carto/issues/2282
The problem;
Consider a large area that doesn't have explicit roads. It could be a
field of grass or a sahara of sand. Typically such surfaces are tagged as
landuse with objects such as housing on top. It surely looks good on a
rendered map, but for routers, journey planners, topology cannot be
inferred by the node, way and relation model. Secondary the wiki[1]
suggests that routers should only use highway=* and junction=*, which
makes sense.
As specific example on the forum I am micromapping a campingplace and
would like to use highway=service to access camp_site=pitch. In real life
this is sometimes a field of grass passing by pitches that are also fields
of grass with some barrier=hedge around it to separate it from the field.
As can be seen in the github issue the current rendering of a
highway=service, area=yes results in a white void where the landuse=grass
is ignored. Cartographers throw in the argument that the map is not a
vectorised version of satellite imagery. Which is true of course, on the
other hand: is a field of grass is not the same as a paved
plaza tagged as highway=pedestrian, area=yes while, the net effect for an
unpaved field is generally the same.
The result;
I would prefer that the map looks like its landuse, but this specific
landuse's primary intention is facilitating access to properties and other
objects. For journey planners this area topology folds back to a single
vertice where from multiple locations, sharing a node with the osm-way
acting as area, can be reached.
My proposal;
Considering that in the camping site example highway=service is primary
used to facilitate access to pitches, I would like to see
highway=service, surface=grass, area=yes possibly in combination with
landuse=grass as indication to render this surface not as a white void,
but as a green field.
The alternative might be to define a user defined highway tag such
as highway=grass.
My current workaround;
highway=grass, area=yes is not rendered which basically gives me the best
of all worlds. Rendering is done by the underlying landuse, routing is
facilitated by the highway=* match.
Matthijs suggested this was a better fora to discuss the issue, than the
carto github issue tracker. So here I am.
Stefan
[1] http://wiki.openstreetmap.org/wiki/OSM_tags_for_routing
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