detect nodes with unneeded highway=crossing

[mkoniecz]

Detection would be very similar to ​http://josm.openstreetmap.de/ticket/9141 - but with "node that may be left by foo in at least two directions" replaced by "node that may be left by foo in at least one direction" (crossing terminating footway/cycleway sometimes happen, also some people may stop mapping feature at this point).

And main check would be:

first rule:

" Any node with (((without foot access AND without bicycle access) OR (without road)) AND (with highway=crossing)) should be reported as "highway=crossing is probably not needed here"."

second rule:

" Any node with (((without foot access AND without bicycle access) OR (without road AND without railway=*)) AND (with crossing=no)) should be reported as "crossing=no is probably not needed here"."

[skyper]

How to map a simple crossing for pedestrian then ?
You have a road with sidewalks on both sides and a crossing without any connected way.

[mkoniecz]

Replying to skyper:

How to map a simple crossing for pedestrian then ?
You have a road with sidewalks on both sides and a crossing without any connected way.

I assume that problem is caused by not covering fact that footways may be tagged using sidewalk key. This can be handled by adding "AND (without sidewalk tag OR sidewalk=no OR sidewalk=none)" to "without foot access" check.

[royas]

Neither missing sidewalk tag nor sidewalk=(no|none) means that there's "no foot access". Pedestrians can use roadside and there's can be marked crossing for them.

[mkoniecz]

I never encountered something like this in my country. So it probably should be reduced "highway=crossing node, not on road" (I encountered this type of problem).

[royas]

That will be better. But what with crossing with railway=tram? Here's overpass query for nodes you talk about - quite a lot: ​http://overpass-turbo.eu/s/1rb

And here's example of marked crossing on road without sidewalks, just roadside: ​http://goo.gl/maps/MNQyX

[mkoniecz]

@royas - thanks for query.

I added "living_street" as road with potential crossings (may make no sense but it frequently happens in Poland).

According to ​http://wiki.openstreetmap.org/wiki/Railways highway=crossing is not the proper tag and railway=crossing should be used (automated fix may be a good idea here).

Also, during checking results of query 4 were obvious problems (4 - existing crossings on living_street, 8 - should be converted to railway=crossing).

My edits resulted from query:

​http://www.openstreetmap.org/browse/changeset/18783800

​http://www.openstreetmap.org/browse/changeset/18783764

​http://www.openstreetmap.org/browse/changeset/18783741

​http://www.openstreetmap.org/browse/changeset/18783664

[Klumbumbus]

Nothing we can do here, without producing false positives (like for ​​http://goo.gl/maps/MNQyX)

Main problem is unconnected nodes and meanwhile we have a test for unconnected highway=crossing and crossing=* see #10825