Tags
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(Redirected from Key Value System)
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What are tags?Tags consist of a 'Key' and a 'Value'. |
Keys and values
Here a a few examples of how keys and values are used in practice:
- highway=residential (a tag with a key of 'highway' and a 'value' of residential which should be used on a Way to indicate a road along which people live.
- name=* (a tag for which the value field is used to contain the name of the particular street
- maxspeed=* (a tag for which the value is often a numeric speed, either in km/h (or in miles per hour if a suffix of 'mph' is provided). SI units do not need to define units, other units, such as miles per hour, knots, yard or pounds should do. Where a regulation is specified in a particular unit then that unit should be used within the value field.
- maxspeed:winter=* (a key which includes a Namespace for 'maxspeed' that indentifies a different value for maxspeed that applies in the winter.
Finding your tag
The following resources are often used to find an appropriate tag or explore tag usage:
- Map Features (a extensive list of the the most commonly used tags)
- Mapping projects (a list of specialist interest projects each with a page describing the relevant tags)
- Taginfo (A useful site to exploring current tag usage, including tag values that are not necessarily documented)
- Tagwatch (A similar service)
- Tagstat (and another)
| Elements | |
|---|---|
| Node • Way • Relation (members and roles) • Tag (key and value) | |
