53 lines
1.7 KiB
PL/PgSQL
53 lines
1.7 KiB
PL/PgSQL
CREATE TABLE IF NOT EXISTS country_label AS (
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SELECT topoint(geom) AS geometry,
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name,
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adm0_a3, abbrev, postal,
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scalerank, labelrank,
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CASE WHEN tiny < 0 THEN 0 ELSE 1 END AS is_tiny
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FROM ne_10m_admin_0_countries
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WHERE scalerank <= 1
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);
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CREATE INDEX IF NOT EXISTS country_label_geometry_idx ON country_label USING gist(geometry);
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CREATE OR REPLACE VIEW country_z0 AS (
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SELECT * FROM country_label WHERE scalerank = 0 AND is_tiny = 0 AND labelrank <= 2
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);
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CREATE OR REPLACE VIEW country_z1 AS (
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SELECT * FROM country_label WHERE scalerank = 0 AND is_tiny = 0 AND labelrank <= 3
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);
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CREATE OR REPLACE VIEW country_z2 AS (
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SELECT * FROM country_label WHERE scalerank = 0 AND is_tiny = 0 AND labelrank <= 4
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);
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CREATE OR REPLACE VIEW country_z3 AS (
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SELECT * FROM country_label WHERE scalerank = 0 AND is_tiny = 0
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);
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CREATE OR REPLACE VIEW country_z5 AS (
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SELECT * FROM country_label WHERE scalerank <= 1
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);
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CREATE OR REPLACE FUNCTION layer_country(bbox geometry, zoom_level int)
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RETURNS TABLE(geometry geometry, name text, abbrev text, postal text, scalerank int, labelrank int) AS $$
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SELECT geometry, name, abbrev, postal, scalerank::int, labelrank::int FROM (
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SELECT * FROM country_z0
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WHERE zoom_level = 0
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UNION ALL
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SELECT * FROM country_z1
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WHERE zoom_level = 1
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UNION ALL
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SELECT * FROM country_z2
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WHERE zoom_level BETWEEN 2 AND 4
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UNION ALL
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SELECT * FROM country_z3
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WHERE zoom_level BETWEEN 3 AND 4
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UNION ALL
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SELECT * FROM country_z5
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WHERE zoom_level >= 5
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) AS t
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WHERE geometry && bbox
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ORDER BY scalerank ASC, labelrank ASC, length(name) ASC;
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$$ LANGUAGE SQL IMMUTABLE;
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