Move aboriginal lands boundaries to boundary layer (#1604)

This PR adds indigenous lands to the `boundary` layer by adding new area features for these objects, along with generalization up to z4. It borrows heavily from the technical processing chain of the `park` layer.

I added new `class`, `name`, and `name:xx` attributes to the boundary layer, in order to support the new area features. Should we (or someone extending this schema) come up with new objects to place in the boundary layer in the future, `class` would support additional categories.

layers/boundary/mapping.yaml

@@ -4,6 +4,67 @@ generalized_tables:
     source: border_linestring
     sql_filter: ST_GeometryType(geometry) = 'ST_LineString' AND (disputed OR dispute OR border_status = 'disputed' OR disputed_by <> '') AND admin_level = 2
 
+  # etldoc: osm_boundary_polygon_gen_z5 -> osm_boundary_polygon_gen_z4
+  boundary_polygon_gen_z4:
+    source: boundary_polygon_gen_z5
+    sql_filter: area>power(ZRES3,2)
+    tolerance: ZRES4
+
+  # etldoc: osm_boundary_polygon_gen_z6 -> osm_boundary_polygon_gen_z5
+  boundary_polygon_gen_z5:
+    source: boundary_polygon_gen_z6
+    sql_filter: area>power(ZRES4,2)
+    tolerance: ZRES5
+
+  # etldoc: osm_boundary_polygon_gen_z7 -> osm_boundary_polygon_gen_z6
+  boundary_polygon_gen_z6:
+    source: boundary_polygon_gen_z7
+    sql_filter: area>power(ZRES5,2)
+    tolerance: ZRES6
+
+  # etldoc: osm_boundary_polygon_gen_z8 -> osm_boundary_polygon_gen_z7
+  boundary_polygon_gen_z7:
+    source: boundary_polygon_gen_z8
+    sql_filter: area>power(ZRES6,2)
+    tolerance: ZRES7
+
+  # etldoc: osm_boundary_polygon_gen_z9 -> osm_boundary_polygon_gen_z8
+  boundary_polygon_gen_z8:
+    source: boundary_polygon_gen_z9
+    sql_filter: area>power(ZRES7,2)
+    tolerance: ZRES8
+
+  # etldoc: osm_boundary_polygon_gen_z10 -> osm_boundary_polygon_gen_z9
+  boundary_polygon_gen_z9:
+    source: boundary_polygon_gen_z10
+    sql_filter: area>power(ZRES8,2)
+    tolerance: ZRES9
+
+  # etldoc: osm_boundary_polygon_gen_z11 -> osm_boundary_polygon_gen_z10
+  boundary_polygon_gen_z10:
+    source: boundary_polygon_gen_z11
+    sql_filter: area>power(ZRES9,2)
+    tolerance: ZRES10
+
+  # etldoc: osm_boundary_polygon_gen_z12 -> osm_boundary_polygon_gen_z11
+  boundary_polygon_gen_z11:
+    source: boundary_polygon_gen_z12
+    sql_filter: area>power(ZRES10,2)
+    tolerance: ZRES11
+
+  # etldoc: osm_boundary_polygon_gen_z13 -> osm_boundary_polygon_gen_z12
+  boundary_polygon_gen_z12:
+    source: boundary_polygon_gen_z13
+    sql_filter: area>power(ZRES11,2)
+    tolerance: ZRES12
+
+  # etldoc: osm_boundary_polygon -> osm_boundary_polygon_gen_z13
+  boundary_polygon_gen_z13:
+    source: boundary_polygon
+    sql_filter: area>power(ZRES12,2) AND ST_IsValid(geometry)
+    tolerance: ZRES13
+
+
 tables:
   # etldoc: imposm3 -> osm_border_linestring
   border_linestring:
@@ -71,3 +132,29 @@ tables:
       - dispute
       boundary_type:
       - maritime
+
+  # etldoc: imposm3 -> osm_boundary_polygon
+  boundary_polygon:
+    type: polygon
+    filters:
+      require:
+        type: [boundary]
+        boundary: [aboriginal_lands]
+    columns:
+    - name: osm_id
+      type: id
+    - name: geometry
+      type: validated_geometry
+    - name: name
+      key: name
+      type: string
+    - name: tags
+      type: hstore_tags
+    - name: boundary
+      key: boundary
+      type: string
+    - name: area
+      type: area
+    mapping:
+      boundary:
+      - aboriginal_lands