[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

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+layer:
+  id: "nuts"
+  description: |
+      Contains administrative boundaries as linestrings (municipalities, counties, provinces, ...)
+      Administrative regions are translated to their equivalent NUTS/LAU classification
+      Fields indicate which NUTS-region is to the left and right of the linestring
+  fields:
+    nuts_level:
+        The mininum NUTS/LAU classification this linestring is part of.
+        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)
+    l_nuts_0_name: |
+      Country on the left side of the linestring
+    l_nuts_1_name: |
+      Region on the left side of the linestring
+    l_nuts_2_name: |
+      Province on the left side of the linestring
+    l_nuts_3_name: |
+      Administrative arrondissement on the left side of the linestring
+    l_nuts_4_name: |
+      Municipality on the left side of the linestring
+    l_nuts_5_name: |
+      Village/suburb on the left side of the linestring
+    r_nuts_0_name: |
+      Country on the right side of the linestring
+    r_nuts_1_name: |
+      Region on the right side of the linestring
+    r_nuts_2_name: |
+      Province on the right side of the linestring
+    r_nuts_3_name: |
+      Administrative arrondissement on the right side of the linestring
+    r_nuts_4_name: |
+      Municipality on the right side of the linestring
+    r_nuts_5_name: |
+      Village/suburb on the right side of the linestring
+  buffer_size: 4
+  datasource:
+    geometry_field: geometry
+    query: (SELECT geometry, nuts_level, l_nuts_0_name, l_nuts_1_name, l_nuts_2_name, l_nuts_3_name, l_nuts_4_name, l_nuts_5_name, r_nuts_0_name, r_nuts_1_name, r_nuts_2_name, r_nuts_3_name, r_nuts_4_name, r_nuts_5_name FROM layer_nuts(!bbox!, z(!scale_denominator!))) AS t
+schema:
+  - ./nuts.sql
+datasources:
+  - type: imposm3
+    mapping_file: ./mapping.yaml