openmaptiles/layers/place/city.sql

56 wiersze
2.3 KiB
PL/PgSQL

-- etldoc: layer_city[shape=record fillcolor=lightpink, style="rounded,filled",
-- etldoc: label="layer_city | <z2_14> z2-z14+" ] ;
-- etldoc: osm_city_point -> layer_city:z2_14
CREATE OR REPLACE FUNCTION layer_city(bbox geometry, zoom_level int, pixel_width numeric)
RETURNS TABLE(osm_id bigint, geometry geometry, name text, name_en text, name_de text, tags hstore, place city_place, "rank" int, capital int) AS $$
SELECT * FROM (
SELECT osm_id, geometry, name,
COALESCE(NULLIF(name_en, ''), name) AS name_en,
COALESCE(NULLIF(name_de, ''), name, name_en) AS name_de,
tags,
place, "rank", normalize_capital_level(capital) AS capital
FROM osm_city_point
WHERE geometry && bbox
AND ((zoom_level = 2 AND "rank" = 1)
OR (zoom_level BETWEEN 3 AND 7 AND "rank" <= zoom_level + 1)
)
UNION ALL
SELECT osm_id, geometry, name,
COALESCE(NULLIF(name_en, ''), name) AS name_en,
COALESCE(NULLIF(name_de, ''), name, name_en) AS name_de,
tags,
place,
COALESCE("rank", gridrank + 10),
normalize_capital_level(capital) AS capital
FROM (
SELECT osm_id, geometry, name,
COALESCE(NULLIF(name_en, ''), name) AS name_en,
COALESCE(NULLIF(name_de, ''), name, name_en) AS name_de,
tags,
place, "rank", capital,
row_number() OVER (
PARTITION BY LabelGrid(geometry, 128 * pixel_width)
ORDER BY "rank" ASC NULLS LAST,
place ASC NULLS LAST,
population DESC NULLS LAST,
length(name) ASC
)::int AS gridrank
FROM osm_city_point
WHERE geometry && bbox
AND ((zoom_level = 7 AND place <= 'town'::city_place
OR (zoom_level BETWEEN 8 AND 10 AND place <= 'village'::city_place)
OR (zoom_level BETWEEN 11 AND 13 AND place <= 'suburb'::city_place)
OR (zoom_level >= 14)
))
) AS ranked_places
WHERE (zoom_level BETWEEN 7 AND 8 AND (gridrank <= 4 OR "rank" IS NOT NULL))
OR (zoom_level = 9 AND (gridrank <= 8 OR "rank" IS NOT NULL))
OR (zoom_level = 10 AND (gridrank <= 12 OR "rank" IS NOT NULL))
OR (zoom_level BETWEEN 11 AND 12 AND (gridrank <= 14 OR "rank" IS NOT NULL))
OR (zoom_level >= 13)
) as city_all;
$$ LANGUAGE SQL IMMUTABLE;