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Tweak place ranks

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This commit is contained in:
lukasmartinelli
2016-10-29 14:29:41 +02:00
parent 3f9f59dfe1
commit 52e133e126
7 changed files with 18 additions and 21 deletions
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8
layers/place/merge_city_rank.sql
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@@ -18,11 +18,9 @@ WITH important_city_point AS (
AND ST_DWithin(ne.geom, osm.geometry, 50000)
)
UPDATE osm_city_point AS osm
-- Normalize both scalerank and labelrank into a ranking system from 1 to 10.
-- Scaleranks for NE populated place range from 0 to 8 and labelranks range from 0 to 10.
-- To give features with both ranks close to 0 a lower rank we increase the range from 1 to 9 and 1 to 11.
-- This means a max combined rank of 20 divided by 2 to get us uniform ranking from 1 to 10
SET "rank" = CEILING((ne.scalerank + 1 + ne.labelrank + 1)/2.0)
-- Move scalerank to range 1 to 10 and merge scalerank 5 with 6 since not enough cities
-- are in the scalerank 5 bucket
SET "rank" = CASE WHEN scalerank <= 5 THEN scalerank + 1 ELSE scalerank END
FROM important_city_point AS ne
WHERE osm.osm_id = ne.osm_id;