On Tue, Nov 24, 2015 at 4:14 PM, Philip Barnes <p...@trigpoint.me.uk> wrote:
> They are not matching reality, can cause long detours and poor routing > unless the mapper provides a lot of connections to the road. Remember > normal pedestrians can cross wherever they want. > That is true, but what we want to give someone in a wheelchair is a route that they can safely take. So at a minimum, the way must be connect, where appropriate, at intersections and other recognized crossings. A recognized crossing would be one with markings for pedestrians or from local knowledge, that it is safe to cross the street. > > > There is also the simple rendering issue, roads are already wide and > are very close or clipping buildings. The sidewalk if mapped in > position is likely to be hidden under the road. > I'm hoping that a wheelchair map would draw the sidewalks and minimize the streets. That is a rendering issue. As we like to say, don't map for the renderer. > > Setting aside the newbie friendly issue, how do you map a crosswalk > > in the middle of a street? > Add a node where the drop kerb is and map which side it belongs to. > If I understand correctly, at a street crossing, the tags would be highway=crossing kerb:(left/right/both)=lowered > > > > How do you map kerb slopes when the the slope is in the corner the > > intersection? > I assume by kerb slope you mean a drop kerb? They are never in the > corner. Remember the way, when editing, represents the centreline so > they are a few metres into the joining street. This also give turning > vehicles space to stop for pedestrians. > Unfortunately, at least around here, they often place the wheelchair ramp in the corner. My guess is it cost less money. As I said earlier, using the corner results in 4 instead of 8 ramps on a typical intersection. A picture of one of these ramps might help. I'll see if I can dig one up. It wouldn't be accurate, but using the same logic as above, (highway=crossing, kerb:(left/right/both)=lowered) would work. >From taginfo, kerb=lowered seems to be the most popular usage and is documented [1]. sidewalk:right:sloped_curb:end [2] is also documented but has limited usage. [1] https://wiki.openstreetmap.org/wiki/Wheelchair_routing [2] https://wiki.openstreetmap.org/wiki/Proposed_features/kerb You have convinced me that the attribute method is optimal. Thanks, Clifford -- @osm_seattle osm_seattle.snowandsnow.us OpenStreetMap: Maps with a human touch
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