Vào lúc 21:59 2023-06-16, Volker Schmidt đã viết:
When trying to reach a destination that is defined by a complete address
(city, street name, house number or name) is that the last meters of the
route are, potentially, much different for a
ciclist/pedestrian/car-driver/delivery-van/ambulance/...
One of the many problems is that we would need for any given address a
navigation aid for each of the potential means of transport.
I have come across one aspect of this when I noticed that Amazon
Logistics staff systematically changed access tags on driveways around
here from "private" to "yes" (or similar).
Micromapping correctly the last meters for all the different means of
transport is the correct theoretical solution. But is it practical ?
Navigation aid?
In Italy the house numbers are assigned to the pedestrian entrance point
for the house/business/shop/airport/...
You're quite fortunate that the meaning of an address is unambiguous in
Italy. At least you can be sure that a pedestrian route will lead to the
main entrance, even if other modes aren't as well-served. Each country
has different addressing standards, so what may be sufficient in one
country might be insufficient in another.
Here in the U.S., the meaning of an address depends on who's using it.
To the tax authorities, it refers to the whole parcel. To emergency
responders, it's either the building or the beginning of the driveway.
To the postal service, it's the mailbox, which can be at the door, at
the street curb, or even at the neighborhood entrance.
Mappers here generally treat the address as an attribute of a building,
POI, or something else. [1] So the address point's coordinates don't
necessarily have any relation to where you would navigate to. But
addr:street is usually either the name of the street that the building
faces, or the name of the street that the letter carrier uses to get to
the mailbox (wherever it is). So at least we know that street is more
related to the feature than the other nearby streets.
For the majority of cases, that assumption is a good one for navigation,
but not always. For example, in the suburbs, a house at a street corner
often has a mailbox at the curb along one street (hence addr:street) --
but to get to the front entrance, you use a walkway from a different
street. To illustrate the point, these examples are fully micromapped
with mailboxes, entrances, driveways, and walkways:
Mailbox on one street, car and pedestrian entrances on another:
https://www.openstreetmap.org/way/37018678
Mailbox and pedestrian entrance on one street, car entrance on another:
https://www.openstreetmap.org/way/38064995
https://www.openstreetmap.org/way/34618091
Mailbox and car entrance on one street, pedestrian entrance on another:
https://www.openstreetmap.org/way/37018646
Mailbox on one street, car and pedestrian entrances accessible from
either street:
https://www.openstreetmap.org/way/34618083
Everything on one street, but addr:street names a different street.
(What's a rule without an exception?)
https://www.openstreetmap.org/way/32602856
https://www.openstreetmap.org/way/34618143
These are trivial cases where getting to the wrong street isn't much of
a problem for most people, though enough of this misdirection could
throw a delivery person off schedule. If the style of micromapping in
these examples becomes widespread enough, then the addr:street-based
heuristic becomes unnecessary. But that's a herculean task, even bigger
than mapping all the addresses in the first place.
Take an address in a pedestrian area within a limited-access zone in my
city.
Take car access. During the night the car access for drop-down is
somewhere in walking distance outside the pedestrian area, but within
the limited-traffic zone (which is not active at night). During the day
it is most likely a park-and-ride location outside the city centre.
This is another good reason why I'd advocate for objectively
micromapping features that data consumers (whether routers or geocoders)
could recognize as navigable points or not, depending on the situation.
For the difficult, indescribable cases, there's already a catch-all site
relation type.
--
m...@nguyen.cincinnati.oh.us
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