How do I filter a given relation to only keep its members that have specific tag? For instance I have a bad relation of a river that contains both river itself and also riverbank... I want to get rid of the riverbank - that means to keep members that have waterway=river and drop members that have waterway=riverbank tags.

asked 25 Dec '11, 23:48

Kozuch's gravatar image

accept rate: 8%

edited 28 Dec '11, 16:37

Assuming you know the relation id:

a) load JOSM

b) File, Download Object - select relation and enter the id. Don't forget to also download relation members

c) Use Edit, Search (or Ctrl-F) and enter child(type:relation id:<id>) waterway=river but replace <id> with the id of the relation

This selects the children (the way members) of the relation with the id <id> but only where they have the tag waterway=river. You might instead want to search for the relation members that have waterway=riverbank tagged, so you can then remove them from the relation in one go. If so just replace waterway=river with waterway=riverbank and once they are selected you should be able to remove them from the relation by selecting the relation entry in the properties panel and clicking the dustbin icon.

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answered 26 Dec '11, 10:21

EdLoach's gravatar image

EdLoach ♦
accept rate: 23%

The problem is the relation is too large and JOSM returns "Internal server error" (so does web front end). Is there a way to import the relation to JOSM in .osm XML format? I have the .osm file for that relation...

Edit #1: Well I just tried to load that file into JOSM but I can not see any data imported (nothing showing in map screen). Does JOSM need nodes to be contained within the .osm file? My file only contains members of the relation (=IDs of ways).

Edit #2: I see the relation loaded but was "incomplete", so nothing showed. So I just downloaded the members and now its OK.

(26 Dec '11, 21:56) Kozuch

I've had that with a few relations recently, and used the download incomplete option you have already found (this seems slower, but more reliable).

(28 Dec '11, 11:30) EdLoach ♦
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question asked: 25 Dec '11, 23:48

question was seen: 4,444 times

last updated: 28 Dec '11, 16:37

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