45 lines
2.0 KiB
PL/PgSQL
45 lines
2.0 KiB
PL/PgSQL
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-- etldoc: layer_city[shape=record fillcolor=lightpink, style="rounded,filled",
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-- etldoc: label="layer_city | <z2_7> z2-z7 | <z8_14_> z8_z14_ " ] ;
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CREATE OR REPLACE FUNCTION layer_city(bbox geometry, zoom_level int, pixel_width numeric)
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RETURNS TABLE(osm_id bigint, geometry geometry, name text, name_en text, place city_place, "rank" int, capital int) AS $$
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-- etldoc: osm_city_point -> layer_city:z2_7
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SELECT osm_id, geometry, name, COALESCE(NULLIF(name_en, ''), name) AS name_en, place, "rank", normalize_capital_level(capital) AS capital
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FROM osm_city_point
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WHERE geometry && bbox
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AND ((zoom_level = 2 AND "rank" = 1)
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OR (zoom_level BETWEEN 3 AND 7 AND "rank" <= zoom_level)
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)
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UNION ALL
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SELECT osm_id, geometry, name,
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COALESCE(NULLIF(name_en, ''), name) AS name_en,
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place,
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COALESCE("rank", gridrank + 10),
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normalize_capital_level(capital) AS capital
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FROM (
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SELECT osm_id, geometry, name, name_en, place, "rank", capital,
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row_number() OVER (
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PARTITION BY LabelGrid(geometry, 128 * pixel_width)
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ORDER BY "rank" ASC NULLS LAST,
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place ASC NULLS LAST,
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population DESC NULLS LAST,
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length(name) ASC
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)::int AS gridrank
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-- etldoc: osm_city_point -> layer_city:z8_14_
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FROM osm_city_point
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WHERE geometry && bbox
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AND ((zoom_level = 8 AND place <= 'town'::city_place
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OR (zoom_level BETWEEN 9 AND 10 AND place <= 'village'::city_place)
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OR (zoom_level BETWEEN 11 AND 13 AND place <= 'suburb'::city_place)
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OR (zoom_level >= 14)
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))
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) AS ranked_places
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WHERE (zoom_level = 8 AND (gridrank <= 4 OR "rank" IS NOT NULL))
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OR (zoom_level = 9 AND (gridrank <= 8 OR "rank" IS NOT NULL))
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OR (zoom_level = 10 AND (gridrank <= 12 OR "rank" IS NOT NULL))
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OR (zoom_level BETWEEN 11 AND 12 AND (gridrank <= 14 OR "rank" IS NOT NULL))
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OR (zoom_level >= 13);
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$$ LANGUAGE SQL IMMUTABLE;
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