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I'm running a connectivity verifier over a small portion of the OSM map (New Zealand, if you're interested, but you'll guess that from the examples below).

Before I barge in and start fixing things I thought I'd better make sure that I'm going about it the right way, so here's some example problems and what I think should be done to fix them. I should point out that I haven't visited most of the places I'm planning to correct, so my first question is: is that a legitimate thing to do? Fix stuff you haven't seen?

The questions are pretty uncontroversial, but I'd rather do this all correctly than muck things up.

First, here is a one-way road that goes nowhere: you can't get out. Should the road continue through the carpark?

Here is another dead-end one-way. I assume I should connect it to the adjoining road?

Here is a road not connected to an adjoining road. There's a nearby node on Waimea road. If I understand correctly, I should connect Monaghan road to the node on Waimea (I'm guessing in this case by moving the end of Monoghan rather than by creating a short link), but I should not break Waimea Road at the intersection?

I guess my question is: what's the policy on intersections? For route-generation purposes, arcs must end at every intersection, but if I understand correctly, for OSM, there must be a shared node at every intersection, but not necessarily a break in either road. Is that right?

asked 19 Jun '13, 00:45

GeoffL's gravatar image

GeoffL
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accept rate: 0%

edited 19 Jun '13, 07:24


You appear to have fixed two of them which seem fine now. The car park seems to have three roads, one with a pay on exit. I don't think the in and out have to join although the out should be extended to reach the car park. Some car parks will have a route out, such as a foot path or cycle track from it which need connecting to the roads in so routers work. This one goes through the pay office so I wouldn't want to be routed through it. One other thing to do in cases of doubt it is contact the previous mapper who may have been "on the ground".

permanent link

answered 19 Jun '13, 08:22

andy%20mackey's gravatar image

andy mackey
13.2k87143285
accept rate: 4%

edited 19 Jun '13, 09:29

Thanks! I think I learned from reading the documentation that the right thing is to give it a go, so I did. There's plenty of carparks around and some are drawn as roads (see http://www.openstreetmap.org/browse/changeset/16613092) and some are areas. I'd prefer roads, but I guess you get what you get.

(19 Jun '13, 19:24) GeoffL
1

@GeoffL actually the best thing is to do both. Create a parking area instead of a single node and tag it as amenity=parking. Draw all roads leading to/from and inside the parking area. The roads inside should be tagged as highway=service and service=parking_aisle. See these examples.

(20 Jun '13, 10:36) scai ♦

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question asked: 19 Jun '13, 00:45

question was seen: 2,806 times

last updated: 20 Jun '13, 10:36

NOTICE: help.openstreetmap.org is no longer in use from 1st March 2024. Please use the OpenStreetMap Community Forum