On 08/08/18 11:49, Tomasz Wójcik wrote:
As highway=footway etc. tags are set to "should not be used on areas" on
Wiki, and mapping them in combination with area=yes is not documented at
all and considered as wrong tagging by part of users, there is a key
"area:highway=*" (133k uses at the moment). Part of users still map
footway areas as a combination anyway, propably because it's rendered by
default style. Due to our rules, that we shouldn't have 2 active tagging
schemes for the same feature, so we should discuss this topic.
I vote for area:highway=* key, because it's simpler, and it gives a
possibility to show also street areas with crossings in the future.
* Wiki with specyfications of a:h=* for certain keys:
https://wiki.openstreetmap.org/wiki/Key:area:highway
* TagInfo: https://taginfo.openstreetmap.org/keys/area:highway
* area:highway=* visualisation: http://osmapa.pl/w/area
As more and more detail is added to the data, the switch from
'macro-mapping' to 'micro-mapping' needs to be considered. There has
been some discussion on park areas being 'footpaths where you can walk
anywhere', so rather than creating multiple ways covering all
combinations of access points, a pedestrian router would understand that
they can enter and exit the area at any valid gateway. I don't know if
any routing software actually does use this approach. Boats on lakes
have a similar problem ... so at a macro-mapping level a waterway or
highway can have a sensible reason for being an area.
Switching to micro-mapping which is starting to expand, one has areas
for each facet of a route. Footpaths, grass verges, roadway, private
drives off the roadway across verge and path and so on. There is however
no current method of converting all of these area elements into 'ways',
so one needs additional highway=xxx ways to provide the routing
information that provides the macro level view. So you do not want an
'area:highway=footpath' if there is a highway='road with footpaths' way
that covers the same object ...
--
Lester Caine - G8HFL
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