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Make ranks more fine grained

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This commit is contained in:
lukasmartinelli
2016-10-29 12:10:23 +02:00
parent 001e44ccd7
commit 3f9f59dfe1
5 changed files with 30 additions and 26 deletions
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8
layers/place/merge_city_rank.sql
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@@ -1,5 +1,5 @@
WITH important_city_point AS (
SELECT osm.geometry, osm.osm_id, osm.name, osm.name_en, ne.scalerank
SELECT osm.geometry, osm.osm_id, osm.name, osm.name_en, ne.scalerank, ne.labelrank
FROM ne_10m_populated_places AS ne, osm_city_point AS osm
WHERE
(
@@ -18,7 +18,11 @@ WITH important_city_point AS (
AND ST_DWithin(ne.geom, osm.geometry, 50000)
)
UPDATE osm_city_point AS osm
SET "rank" = ne.scalerank
-- 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)
FROM important_city_point AS ne
WHERE osm.osm_id = ne.osm_id;