Key:ref:gwlnr
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 ref:gwlnr
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| Description |
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A uniform reference number for a river in Switzerland. Two letters followed by 10 digits. The middle part is ref:gewiss.  
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| Group: references |
| Used on these elements |
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| Useful combination |
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| See also |
| Status: in use |
| Tools for this tag |
ref:gwlnr=* can be used to provide the rivers with the uniform numbering within Switzerland. The key is appended to waterway=* or added to the river-relation.
As described on the German Wikipedia, the reference numbers have the form "AG0034220003" with a two letter code for a Swiss canton (or "CH") followed by 10 digits. It includes the GEWISS number.
References
Possible tagging errors
Values that are only a few digits are likely ref:gewiss=*.
[out:json][timeout:100];
nwr["ref:gwlnr"~"^[1-9][0-9]*$"];
out meta geom;