On 01/08/2016 22:35, Meg Drouhard wrote:
Hello,
We are proposing to import open municipal sidewalk data from the city
of Seattle as described in this proposal:
http://wiki.openstreetmap.org/wiki/Seattle,_Washington/Sidewalk_Import.
Imports will be tagged according to the sidewalk schema that we
propose here:
http://wiki.openstreetmap.org/wiki/Proposed_features/sidewalk_schema.
The schema is a proposal for standardization of conventions, rather
than changing or adding tags, and it is particularly concerned with
features of sidewalks that may aid or impede travel for people with
limited mobility.
From reading that a number of potential issues occur to me - one of
which is that it does appear to be a change to the way that crossings
are mapped. Your page says "recommend crossings be mapped as ways".
http://wiki.openstreetmap.org/wiki/Tag:highway%3Dcrossing currently
suggests nodes only (and there are people out there avidly changing
crossings mapped as ways to crossings mapped as nodes). Whilst this may
just be a clarification issue, at the very least you'd want to liaise
with them so that you get their input. Perhaps some examples (on the
dev server) would help?
Whilst I can understand why you'd want to map e.g. drop kerbs for
wheelchair use, I think you need to remember that most of the world is
not like Seattle. In most places in the world jaywalking isn't even a
concept and you can cross a road anywhere that you like. How are you
going to model this?
Also on
http://wiki.openstreetmap.org/wiki/Proposed_features/sidewalk_schema
you've said " According to Routing/online_routers, routing options for
pedestrians, wheelchair users, and blind persons significantly more
limited than other routing use cases.". This simply isn't the case for
pedestrians - I'm not aware of a mainstream handheld router using OSM
data that _doesn't_ support pedestrian routing. My experience is that
handheld routers often get confused when sidewalks are mapped
separately, not because it's inherantly a bad idea, but because people
tend to make a mess of it. Mapping sidewalks as a separate way is (in
both volume and connection terms) harder than mapping as
left/right/both; there's more for mappers, especially new mappers, to
get wrong.
Perhaps it would help to explain what you're proposing to do if you were
to take a couple of examples of roads with and without sidewalks
elsewhere in the world both north and south of the equator and show
(again perhaps on the dev server) how you'd change them to sidewalks
mapped according to your proposal?
One other question - how would I (from a routing / rendering
perspective) know that "this road has a sidewalk" or "this sidewalk is
adjacent to named road X"? In my case I'm asking that because I'm
rendering sidewalks as per
http://www.openstreetmap.org/user/SomeoneElse/diary/38136 , but it's
also relevant from a routing perspective as well.
Best Regards,
Andy
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