Filtering on key only if key exists using overpass query language

I want to match bridges which are considered metallic or unknown.

I tried this:

area[name="Australia"]->.a;
way(area.a)
[man_made=bridge]
[bridge!=viaduct]
["bridge:structure"!=humpback]
[material~metal]
[material~steel]
[material~reinforced_concrete]
["bridge:material"~steel]
["bridge:material"~metal];
out geom;

But it this ignores bridges that don't have the material or "bridge:material" key. Looking at the overpass docs doesn't mention anyway to match on a key only if that key exists.

overpass overpass-ql

asked 05 Feb '17, 09:46

CMCDragonkai
21●1●1●2
accept rate: 0%

I think you should use the union operator ( ) and search for bridges without bridge:material on one hand with [!"bridge:material"] and the ones you are looking for above.

(05 Feb '17, 11:22) escada

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Question tags:

overpass ×483
overpass-ql ×65

question asked: 05 Feb '17, 09:46

question was seen: 1,228 times

last updated: 05 Feb '17, 11:22

Filtering on key only if key exists using overpass query language

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