25 lines
1.2 KiB
SQL
25 lines
1.2 KiB
SQL
ALTER TABLE osm_state_point DROP CONSTRAINT IF EXISTS osm_state_point_rank_constraint;
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WITH important_state_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, ne.datarank
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FROM ne_10m_admin_1_states_provinces_shp AS ne, osm_state_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 difficult
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ST_Within(osm.geometry, ne.geom)
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-- We leave out leess important states
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AND ne.scalerank <= 3 AND ne.labelrank <= 2
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)
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UPDATE osm_state_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 states range from 2 to 11 and labelranks range from 0 to 20 and dataranks from 1 to 11.
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-- This means a max combined rank of 42 divided by 7 to get us uniform ranking from 1 to 6
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SET "rank" = CEILING((scalerank + labelrank + datarank)/7.0)
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FROM important_state_point AS ne
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WHERE osm.osm_id = ne.osm_id;
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DELETE FROM osm_state_point WHERE "rank" IS NULL;
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ALTER TABLE osm_state_point ADD CONSTRAINT osm_state_point_rank_constraint CHECK("rank" BETWEEN 1 AND 6);
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CREATE INDEX IF NOT EXISTS osm_state_point_rank_idx ON osm_state_point("rank");
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