27 lines
1.3 KiB
SQL
27 lines
1.3 KiB
SQL
ALTER TABLE osm_country_point DROP CONSTRAINT IF EXISTS osm_country_point_rank_constraint;
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WITH important_country_point AS (
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SELECT osm.geometry, osm.osm_id, osm.name, COALESCE(NULLIF(osm.name_en, ''), ne.name) AS name_en, ne.scalerank, ne.labelrank
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FROM ne_10m_admin_0_countries AS ne, osm_country_point AS osm
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WHERE
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-- We only match whether the point is within the Natural Earth polygon
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-- because name matching is to difficult since OSM does not contain good
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-- enough coverage of ISO codes
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ST_Within(osm.geometry, ne.geom)
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-- We leave out tiny countries
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AND ne.scalerank <= 1
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)
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UPDATE osm_country_point AS osm
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-- Normalize both scalerank and labelrank into a ranking system from 1 to 6
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-- Scaleranks for NE countries range from 0 to 6 and labelranks range from 2 to 10.
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-- This means a max combined rank of 16 divided by 3 to get us uniform ranking from 1 to 6
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SET "rank" = CEILING((scalerank + labelrank)/3.0)
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FROM important_country_point AS ne
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WHERE osm.osm_id = ne.osm_id;
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UPDATE osm_country_point AS osm
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SET "rank" = 6
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WHERE "rank" < 0 OR "rank" > 6 OR "rank" IS NULL;
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ALTER TABLE osm_country_point ADD CONSTRAINT osm_country_point_rank_constraint CHECK("rank" BETWEEN 1 AND 6);
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CREATE INDEX IF NOT EXISTS osm_country_point_rank_idx ON osm_country_point("rank"); |