On Tue, 7 Jan 2020 at 16:51, Volker Schmidt <vosc...@gmail.com> wrote:
> May I come back to the navigation aspect. > Let's assume I have a single square building aligned with the compass > directions. It is between two parallel East<>West roads. It is placed > closer to the road on the North side. > Its entrance is on the South side from the road to the South. There is a > fence around the plot that stretches all the way from one road to the > other. The access is by a gate in the fence to the South. No footpath or > driveway is on the map. With other words, a quite frequent situation in > OSM. If I put the house number on the building the navigation device brings > me to a point close to the house on the North road, where there is no > entrance. If I place the number on a node close to where the gate is on the > South road, then the navigation device brings me to the desired place. But > I have no information about the association between the number on the gate > and the building. > Not frequent where I am, but it happens. Map the fence, the gate, and the path from the road to the front door. A decent routeing algorithm will send a self-driving car to the right place. Alert humans can interpret what they see on the map. Not perfect, because a disturbing number of holiday cottages around here feel it necessary to warn people that if they enter the postcode into their satnav they'll end up in the wrong place. > > If you think this through we need a means to connect logically the > number-bearing entrance to the house it belongs to, > That's what a driveway or footpath is for. IF we want to have the number-building association as information in the > map. But do we need this information at all? Is it not enough to know that > we have to go the gate with the house number, if we want to go to the house > with that number. How I have to move on the property to get from the gate > to the house is not (necessarily) information that is on the map. > Your solution works unless there is more than one property sharing that same gateway or driveway. My solution works either way, at the expense of sometimes having to map a fence and driveway/footpath you otherwise might not. I don't see misplacing nodes as being a good alternative to getting the routeing right. -- Paul
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