Add power layer

layers/power/mapping.yaml

@@ -0,0 +1,38 @@
+generalized_tables:
+  # etldoc: osm_power_linestring_gen_z11 -> osm_power_linestring_gen_z10
+  power_linestring_gen_z10:
+    source: power_linestring_gen_z11
+    tolerance: ZRES11
+
+  # etldoc: osm_power_linestring_gen_z12 -> osm_power_linestring_gen_z11
+  power_linestring_gen_z11:
+    source: power_linestring_gen_z12
+    tolerance: ZRES12
+
+  # etldoc: osm_power_linestring -> osm_power_linestring_gen_z12
+  power_linestring_gen_z12:
+    source: power_linestring
+    sql_filter: ST_IsValid(geometry)
+    tolerance: ZRES13
+
+power_field: &power
+  key: power
+  name: power
+  type: string
+
+tables:
+  # etldoc: imposm3 -> osm_power_linestring
+  power_linestring:
+    type: linestring
+    columns:
+    - name: osm_id
+      type: id
+    - name: geometry
+      type: geometry
+    - name: power
+      key: power
+      type: string
+    mapping:
+      power:
+      - line
+      - minor_line

layers/power/power.yaml

@@ -0,0 +1,20 @@
+layer:
+  id: "power"
+  description: |
+      Power lines [power](http://wiki.openstreetmap.org/wiki/power).
+  buffer_size: 4
+  fields:
+    power:
+      description: |
+          The original value of [`power`](http://wiki.openstreetmap.org/wiki/Key:power) tag
+      values:
+      - line
+      - minor_line
+  datasource:
+    geometry_field: geometry
+    query: (SELECT geometry, power FROM layer_power(!bbox!, z(!scale_denominator!))) AS t
+schema:
+  - ./power.sql
+datasources:
+  - type: imposm3
+    mapping_file: ./mapping.yaml

openmaptiles.yaml

@@ -8,6 +8,7 @@ tileset:
     - layers/park/park.yaml
     - layers/boundary/boundary.yaml
     - layers/aeroway/aeroway.yaml
+    - layers/power/power.yaml
     - layers/transportation/transportation.yaml
     - layers/building/building.yaml
     - layers/water_name/water_name.yaml