On 17/03/2011 12:55, Sam Kuper wrote:
...
Now, I see from your link that pedestrianised streets and squares are
handled by OpenStreetMap, but I don't see any examples of roads having
pavements alongside them.
As they used to say on Blue Peter, here's one I prepared earlier:
http://www.openstreetmap.org/browse/way/44976968
See:
http://wiki.openstreetmap.org/wiki/Proposed_features/Footway
for the documentation. Ignore the "Proposed" bit of the link, that's
just wikibollocks.
The implication is that as far as OpenStreetMap is concerned,
pedestrians share the road surface equally with cars, trucks, bikes,
buses, motorbikes and so on, which is not normally the case in the
countries I've visited.
Strictly speaking no, it means that OSM doesn't know because no-one has
collected the data. Routers may well decide that where
footway=no/left/right/both isn't available that people can still walk
from A to B (in UK cities pavements are so common that they tend to get
assumed by mappers I think).
In rural areas in Swaziland, China, Zimbabwe, France, the USA and the
UK, and in some rare urban cases too, one encounters roads with
pavements only on one side, or on neither side. Routing pedestrians
along such roads would be inappropriate, but unless the presence or
absence of pavements is represented somehow, how could one expect a
routing algorithm to make a sensible choice?
It was the lack of roadside pavements near where I lived that prompted
me to start recording them near where I live. This is a "lack of data"
problem rather than a "how could we represent that data" problem, which
rather comes back to what Richard said at the end of his reply:
"So my specific advice to you, about extending OpenStreetMap with this
data, is for you to go out and do your first survey for OpenStreetMap."
Cheers,
Andy
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