From 5c58cb70e0067b2a97437974aa3d24d8637640ac Mon Sep 17 00:00:00 2001
From: lukasmartinelli <me@lukasmartinelli.ch>
Date: Fri, 28 Oct 2016 16:11:26 +0200
Subject: [PATCH] Add water name layer

---
 docker-compose.yml                    |  5 +++++
 layers/water_name/layer.sql           | 10 ++++++++++
 layers/water_name/merge_lakelines.sql |  9 +++++++++
 layers/water_name/water_name.yaml     | 18 ++++++++++++++++++
 openmaptiles.yaml                     |  1 +
 5 files changed, 43 insertions(+)
 create mode 100644 layers/water_name/layer.sql
 create mode 100644 layers/water_name/merge_lakelines.sql
 create mode 100644 layers/water_name/water_name.yaml

diff --git a/docker-compose.yml b/docker-compose.yml
index dcc2db35..9ac846c5 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -19,6 +19,11 @@ services:
     env_file: .env
     links:
     - postgres
+  import-lakelines:
+    image: "openmaptiles/import-lakelines"
+    env_file: .env
+    links:
+    - postgres
   import-osm:
     image: "openmaptiles/import-osm"
     env_file: .env
diff --git a/layers/water_name/layer.sql b/layers/water_name/layer.sql
new file mode 100644
index 00000000..e6fafc9c
--- /dev/null
+++ b/layers/water_name/layer.sql
@@ -0,0 +1,10 @@
+CREATE OR REPLACE FUNCTION layer_water_name(bbox geometry, zoom_level integer)
+RETURNS TABLE(osm_id bigint, geometry geometry, name text, name_en text, class text) AS $$
+    SELECT osm_id, geometry, name, name_en, 'lake'::text AS class
+    FROM osm_water_lakeline
+    WHERE geometry && bbox
+      AND name <> ''
+      AND ((zoom_level BETWEEN 10 AND 13 AND LineLabel(zoom_level, NULLIF(name, ''), geometry))
+        OR (zoom_level >= 14))
+    ORDER BY ST_Length(geometry) DESC;
+$$ LANGUAGE SQL IMMUTABLE;
diff --git a/layers/water_name/merge_lakelines.sql b/layers/water_name/merge_lakelines.sql
new file mode 100644
index 00000000..125f8022
--- /dev/null
+++ b/layers/water_name/merge_lakelines.sql
@@ -0,0 +1,9 @@
+CREATE TABLE IF NOT EXISTS osm_water_lakeline AS (
+	SELECT wp.osm_id,
+		ll.wkb_geometry AS geometry,
+		name, name_en
+    FROM osm_water_polygon AS wp
+    INNER JOIN lake_centerline ll ON wp.osm_id = ll.osm_id
+);
+
+CREATE INDEX IF NOT EXISTS osm_water_lakeline_geometry_idx ON osm_water_lakeline USING gist(geometry);
diff --git a/layers/water_name/water_name.yaml b/layers/water_name/water_name.yaml
new file mode 100644
index 00000000..8080b446
--- /dev/null
+++ b/layers/water_name/water_name.yaml
@@ -0,0 +1,18 @@
+layer:
+  id: "water_name"
+  description: |
+      OSM lakelines.
+  buffer_size: 8
+  srs: +proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0.0 +k=1.0 +units=m +nadgrids=@null +wktext +no_defs +over
+  fields:
+    class: String
+  datasource:
+    geometry_field: geometry
+    srid: 900913
+    query: (SELECT geometry, name, name_en, class FROM layer_water_name(!bbox!, z(!scale_denominator!))) AS t
+schema:
+  - ./merge_lakelines.sql
+  - ./layer.sql
+datasources:
+  - type: imposm3
+    mapping_file: ../water/mapping.yaml
diff --git a/openmaptiles.yaml b/openmaptiles.yaml
index 81a57ed2..5e50cb15 100644
--- a/openmaptiles.yaml
+++ b/openmaptiles.yaml
@@ -8,6 +8,7 @@ tileset:
     #- layers/housenumber/housenumber.yaml
     - layers/place/place.yaml
     - layers/railway/railway.yaml
+    - layers/water_name/water_name.yaml
     - layers/water/water.yaml
     - layers/waterway/waterway.yaml
     - layers/landcover/landcover.yaml