X-Git-Url: https://git.openstreetmap.org./nominatim.git/blobdiff_plain/c6d859a08ac554ae8335bfc408f9af99ad24e910..764dcd7f6459c08aafd5cf2fcb7902cc2868cb30:/sql/functions/ranking.sql

diff --git a/sql/functions/ranking.sql b/sql/functions/ranking.sql
index d23944b1..a84269fe 100644
--- a/sql/functions/ranking.sql
+++ b/sql/functions/ranking.sql
@@ -55,6 +55,53 @@ END;
 $$
 LANGUAGE plpgsql IMMUTABLE;
 
+-- Compute a base address rank from the extent of the given geometry.
+--
+-- This is all simple guess work. We don't need particularly good estimates
+-- here. This just avoids to have very high ranked address parts in features
+-- that span very large areas (or vice versa).
+CREATE OR REPLACE FUNCTION geometry_to_rank(search_rank SMALLINT, geometry GEOMETRY, country_code TEXT)
+  RETURNS SMALLINT
+  AS $$
+DECLARE
+  area FLOAT;
+BEGIN
+  IF ST_GeometryType(geometry) in ('ST_Polygon','ST_MultiPolygon') THEN
+      area := ST_Area(geometry);
+  ELSIF ST_GeometryType(geometry) in ('ST_LineString','ST_MultiLineString') THEN
+      area := (ST_Length(geometry)^2) * 0.1;
+  ELSE
+    RETURN search_rank;
+  END IF;
+
+  -- adjust for the fact that countries come in different sizes
+  IF country_code IN ('ca', 'au', 'ru') THEN
+    area := area / 5;
+  ELSIF country_code IN ('br', 'kz', 'cn', 'us', 'ne', 'gb', 'za', 'sa', 'id', 'eh', 'ml', 'tm') THEN
+    area := area / 3;
+  ELSIF country_code IN ('bo', 'ar', 'sd', 'mn', 'in', 'et', 'cd', 'mz', 'ly', 'cl', 'zm') THEN
+    area := area / 2;
+  END IF;
+
+  IF area > 1 THEN
+    RETURN 7;
+  ELSIF area > 0.1 THEN
+    RETURN 9;
+  ELSIF area > 0.01 THEN
+    RETURN 13;
+  ELSIF area > 0.001 THEN
+    RETURN 17;
+  ELSIF area > 0.0001 THEN
+    RETURN 19;
+  ELSIF area > 0.000005 THEN
+    RETURN 21;
+  END IF;
+
+   RETURN 23;
+END;
+$$
+LANGUAGE plpgsql IMMUTABLE;
+
 
 -- Guess a ranking for postcodes from country and postcode format.
 CREATE OR REPLACE FUNCTION get_postcode_rank(country_code VARCHAR(2), postcode TEXT,
@@ -116,12 +163,23 @@ $$
 LANGUAGE plpgsql IMMUTABLE;
 
 
--- Get standard search and address rank for an object
+-- Get standard search and address rank for an object.
+--
+-- \param country        Two-letter country code where the object is in.
+-- \param extended_type  OSM type (N, W, R) or area type (A).
+-- \param place_class    Class (or tag key) of object.
+-- \param place_type     Type (or tag value) of object.
+-- \param admin_level    Value of admin_level tag.
+-- \param is_major       If true, boost search rank by one.
+-- \param postcode       Value of addr:postcode tag.
+-- \param[out] search_rank   Computed search rank.
+-- \param[out] address_rank  Computed address rank.
+--
 CREATE OR REPLACE FUNCTION compute_place_rank(country VARCHAR(2),
-                                              osm_type VARCHAR(1),
+                                              extended_type VARCHAR(1),
                                               place_class TEXT, place_type TEXT,
                                               admin_level SMALLINT,
-                                              is_area BOOLEAN, is_major BOOLEAN,
+                                              is_major BOOLEAN,
                                               postcode TEXT,
                                               OUT search_rank SMALLINT,
                                               OUT address_rank SMALLINT)
@@ -134,14 +192,10 @@ BEGIN
   THEN
     SELECT * INTO search_rank, address_rank
       FROM get_postcode_rank(country, postcode);
-
-    IF NOT is_area THEN
-      address_rank := 0;
-    END IF;
-  ELSEIF osm_type = 'N' AND place_class = 'highway' THEN
+  ELSEIF extended_type = 'N' AND place_class = 'highway' THEN
     search_rank = 30;
     address_rank = 0;
-  ELSEIF place_class = 'landuse' AND NOT is_area THEN
+  ELSEIF place_class = 'landuse' AND extended_type != 'A' THEN
     search_rank = 30;
     address_rank = 0;
   ELSE
@@ -166,7 +220,7 @@ BEGIN
     END IF;
 
     -- some postcorrections
-    IF place_class = 'waterway' AND osm_type = 'R' THEN
+    IF place_class = 'waterway' AND extended_type = 'R' THEN
         -- Slightly promote waterway relations so that they are processed
         -- before their members.
         search_rank := search_rank - 1;