Documnt place

layers/place/README.md

@@ -0,0 +1,25 @@
+# place
+
+The place layer consists out of [countries](http://wiki.openstreetmap.org/wiki/Tag:place%3Dcountry),
+[states](http://wiki.openstreetmap.org/wiki/Tag:place%3Dstate) and [cities](http://wiki.openstreetmap.org/wiki/Key:place).
+Apart from the roads this is also one of the more important layers to create a beautiful map.
+We suggest you use different font styles and sizes to create a text hierarchy.
+
+## Fields
+
+- **name_en**: The english `name:en` value if available.
+- **name**: The OSM [`name`](http://wiki.openstreetmap.org/wiki/Key:name) value of the POI.
+- **rank**: Countries, states and the most important cities all have a `rank` field ranging from `1` to `6` which
+marks the importance of the feature. Less important places do not have a `rank`.
+Use this to build a text hierarchy. The rank value originates from Natural Earth data and is either the
+original `scalerank` for cities or the original `labelrank` for countries and states.
+- **class**: Distinguish between `country`, `state` and other city classes like
+`city`, `town`, `village`, `hamlet`, `suburb`, `neighbourhood` or `isolated_dwelling`.
+Use this to separately style the different places according to their importance (usually country and state different
+than cities).
+
+## Mapping
+
+![](mapping.png)
+
+