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Remove unnecessary fields from boundary

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lukasmartinelli
2016-10-28 20:39:38 +02:00
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# boundary
Contains administrative boundaries as linestrings (no maritime boundaries yet) as linestrings.
Until z7 [Natural Earth data](http://www.naturalearthdata.com/downloads/10m-cultural-vectors/10m-admin-0-countries/)
is used after which OSM boundaries ([`boundary=administrative`](http://wiki.openstreetmap.org/wiki/Tag:boundary%3Dadministrative)) are present from z8 to z14.
OSM data contains all [`admin_level`](http://wiki.openstreetmap.org/wiki/Tag:boundary%3Dadministrative#admin_level)
but for most styles it makes sense to just style `admin_level=2` and `admin_level=4`.
## Fields
- **admin_level**: OSM [admin_level](http://wiki.openstreetmap.org/wiki/Tag:boundary%3Dadministrative#admin_level)
indicating the level of importance of this boundary.
At low zoom levels the Natural Earth boundaries are mapped to the equivalent admin levels.
## Mapping
![](mapping.png)