[WIP] NUTS layer:

Municipalities, Provinces, Regions etc as linestrings (with polygons used in intermediate step) representing what is left/right of the border

layers/boundary/nuts.yaml.polygons.backup

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+layer:
+  id: "nuts"
+  description: |
+      Contains administrative boundaries as polygons (municipalities, counties, provinces, ...)
+      Administrative regions are translated to their equivalent NUTS/LAU classification
+  fields:
+    nuts_level:
+        The NUTS/LAU classification this polygon fall in.
+        NUTS only goes to 3 thus LAU 1 & 2 are mapped as NUTS 4 & 5.
+         NUTS 0 = Countries
+         NUTS 1 = Regions (e.g. Vlaams-brabant)
+         NUTS 2 = Provinces (e.g. Limburg)
+         NUTS 3 = Administrative arrondissements (e.g. Antwerpen, best to ignore these)
+         NUTS 4 = Municipalities (e.g. Lummen)
+         NUTS 5 = Villages/Suburbs (e.g. Linkhout)
+    name: |
+        Name of the region
+  buffer_size: 4
+  datasource:
+    geometry_field: geometry
+    query: (SELECT geometry, nuts_level, name FROM osm_boundary_polygon) AS t
+schema:
+  - ./nuts.sql
+datasources:
+  - type: imposm3
+    mapping_file: ./mapping.yaml