Harald,
That's great info and very helpful.
Thanks,
Bernie.
Sent from Samsung Mobile
-------- Original message --------
From: Harald Kliems <[email protected]>
Date:12/03/2013 7:04 PM (GMT-04:00)
To: berniejconnors <[email protected]>
Cc: [email protected]
Subject: Re: [Talk-ca] Problem with overpasses in NB??
Okay, so I've done some digging. Unfortunately, the Overpass API does not have
a function to identify intersecting ways with a shared node. The only way to
find those would be do do an Overpass query for all the bridges and then use
javascript to identify the ways that share nodes. I lack the skills to do the
latter.
Identifying bridges which lack the layer tag, however, is easy:
http://overpass-turbo.eu/s/1FZ
Once all the missing layer tags will have been added, we can then use
keepright's (http://keepright.ipax.at/) layer conflicts function. Based on the
description of that function it actually seems like it should already be able
to find the problematic junctions:
"Connected ways should be on the same layer. Crossings on intermediate nodes of
ways on different layers are obviously wrong. Junctions on end-nodes of ways on
different layers are also deprecated, but common practice. So you may ignore
this part of the check and switch them off separately. Please note that bridges
are set to layer +1, and tunnels to -1, anything else to layer 0 implicitly if
no layer tag is present."
Harald.
On Tue, Dec 3, 2013 at 9:21 AM, berniejconnors <[email protected]> wrote:
Here is another sample of the problem since Richard corrected my other example
;-)
http://osm.org/go/cgOZhazjT?m=
As I see it there are 2 problems with these bridges:
1) they intersect with the roads that pass beneath them
2) the layer value is not set so the default value of layer=0 (ground) is
assumed. Typically a bridge should have layer=1.
I would like to have an overpass api query that selects bridges that meet
either of these conditions.
Thanks,
Bernie.
Sent from Samsung Mobile
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