openmaptiles/layers/landuse/landuse.sql

-- etldoc: ne_50m_urban_areas -> landuse_z4
CREATE OR REPLACE VIEW landuse_z4 AS
(
SELECT NULL::bigint        AS osm_id,
       geometry,
       'residential'::text AS landuse,
       NULL::text          AS amenity,
       NULL::text          AS leisure,
       NULL::text          AS tourism,
       NULL::text          AS place,
       NULL::text          AS waterway
FROM ne_50m_urban_areas
WHERE scalerank <= 2
    );

-- etldoc: ne_50m_urban_areas -> landuse_z5
CREATE OR REPLACE VIEW landuse_z5 AS
(
SELECT NULL::bigint        AS osm_id,
       geometry,
       'residential'::text AS landuse,
       NULL::text          AS amenity,
       NULL::text          AS leisure,
       NULL::text          AS tourism,
       NULL::text          AS place,
       NULL::text          AS waterway
FROM ne_50m_urban_areas
    );

-- etldoc: osm_landuse_polygon_gen7 -> landuse_z6
CREATE OR REPLACE VIEW landuse_z6 AS
(
SELECT osm_id,
       geometry,
       landuse,
       amenity,
       leisure,
       tourism,
       place,
       waterway
FROM osm_landuse_polygon_gen7
    );

-- etldoc: osm_landuse_polygon_gen6 -> landuse_z8
CREATE OR REPLACE VIEW landuse_z8 AS
(
SELECT osm_id,
       geometry,
       landuse,
       amenity,
       leisure,
       tourism,
       place,
       waterway
FROM osm_landuse_polygon_gen6
    );

-- etldoc: osm_landuse_polygon_gen5 -> landuse_z9
CREATE OR REPLACE VIEW landuse_z9 AS
(
SELECT osm_id,
       geometry,
       landuse,
       amenity,
       leisure,
       tourism,
       place,
       waterway
FROM osm_landuse_polygon_gen5
    );

-- etldoc: osm_landuse_polygon_gen4 -> landuse_z10
CREATE OR REPLACE VIEW landuse_z10 AS
(
SELECT osm_id,
       geometry,
       landuse,
       amenity,
       leisure,
       tourism,
       place,
       waterway
FROM osm_landuse_polygon_gen4
    );

-- etldoc: osm_landuse_polygon_gen3 -> landuse_z11
CREATE OR REPLACE VIEW landuse_z11 AS
(
SELECT osm_id,
       geometry,
       landuse,
       amenity,
       leisure,
       tourism,
       place,
       waterway
FROM osm_landuse_polygon_gen3
    );

-- etldoc: osm_landuse_polygon_gen2 -> landuse_z12
CREATE OR REPLACE VIEW landuse_z12 AS
(
SELECT osm_id,
       geometry,
       landuse,
       amenity,
       leisure,
       tourism,
       place,
       waterway
FROM osm_landuse_polygon_gen2
    );

-- etldoc: osm_landuse_polygon_gen1 -> landuse_z13
CREATE OR REPLACE VIEW landuse_z13 AS
(
SELECT osm_id,
       geometry,
       landuse,
       amenity,
       leisure,
       tourism,
       place,
       waterway
FROM osm_landuse_polygon_gen1
    );

-- etldoc: osm_landuse_polygon -> landuse_z14
CREATE OR REPLACE VIEW landuse_z14 AS
(
SELECT osm_id,
       geometry,
       landuse,
       amenity,
       leisure,
       tourism,
       place,
       waterway
FROM osm_landuse_polygon
    );

-- etldoc: layer_landuse[shape=record fillcolor=lightpink, style="rounded,filled",
-- etldoc:     label="layer_landuse |<z4> z4|<z5>z5|<z6>z6|<z7>z7| <z8> z8 |<z9> z9 |<z10> z10 |<z11> z11|<z12> z12|<z13> z13|<z14> z14+" ] ;

CREATE OR REPLACE FUNCTION layer_landuse(bbox geometry, zoom_level int)
    RETURNS TABLE
            (
                osm_id   bigint,
                geometry geometry,
                class    text
            )
AS
$$
SELECT osm_id,
       geometry,
       COALESCE(
               NULLIF(landuse, ''),
               NULLIF(amenity, ''),
               NULLIF(leisure, ''),
               NULLIF(tourism, ''),
               NULLIF(place, ''),
               NULLIF(waterway, '')
           ) AS class
FROM (
         -- etldoc: landuse_z4 -> layer_landuse:z4
         SELECT *
         FROM landuse_z4
         WHERE zoom_level = 4
         UNION ALL
         -- etldoc: landuse_z5 -> layer_landuse:z5
         SELECT *
         FROM landuse_z5
         WHERE zoom_level = 5
         UNION ALL
         -- etldoc: landuse_z6 -> layer_landuse:z6
         -- etldoc: landuse_z6 -> layer_landuse:z7
         SELECT *
         FROM landuse_z6
         WHERE zoom_level BETWEEN 6 AND 7
         UNION ALL
         -- etldoc: landuse_z8 -> layer_landuse:z8
         SELECT *
         FROM landuse_z8
         WHERE zoom_level = 8
         UNION ALL
         -- etldoc: landuse_z9 -> layer_landuse:z9
         SELECT *
         FROM landuse_z9
         WHERE zoom_level = 9
         UNION ALL
         -- etldoc: landuse_z10 -> layer_landuse:z10
         SELECT *
         FROM landuse_z10
         WHERE zoom_level = 10
         UNION ALL
         -- etldoc: landuse_z11 -> layer_landuse:z11
         SELECT *
         FROM landuse_z11
         WHERE zoom_level = 11
         UNION ALL
         -- etldoc: landuse_z12 -> layer_landuse:z12
         SELECT *
         FROM landuse_z12
         WHERE zoom_level = 12
         UNION ALL
         -- etldoc: landuse_z13 -> layer_landuse:z13
         SELECT *
         FROM landuse_z13
         WHERE zoom_level = 13
         UNION ALL
         -- etldoc: landuse_z14 -> layer_landuse:z14
         SELECT *
         FROM landuse_z14
         WHERE zoom_level >= 14
     ) AS zoom_levels
WHERE geometry && bbox;
$$ LANGUAGE SQL STABLE
                -- STRICT
                PARALLEL SAFE;