Show islands #68

layers/place/island_rank.sql

@@ -0,0 +1,9 @@
+CREATE OR REPLACE FUNCTION island_rank(area REAL) RETURNS INT AS $$
+    SELECT CASE
+        WHEN area < 10000000 THEN 6
+        WHEN area BETWEEN  1000000 AND 15000000 THEN 5
+        WHEN area BETWEEN 15000000 AND 40000000 THEN 4
+        WHEN area > 40000000 THEN 3
+        ELSE 7
+    END;
+$$ LANGUAGE SQL IMMUTABLE STRICT;