use line interpolation to create centroid for lines

[nominatim.git] / lib-sql / functions / utils.sql

diff --git a/lib-sql/functions/utils.sql b/lib-sql/functions/utils.sql
index a8ebcc417d357a9154673474d69f64ce55a6be97..d15ebe43f660464b87ec916155b3c3725c09abce 100644 (file)
--- a/lib-sql/functions/utils.sql
+++ b/lib-sql/functions/utils.sql
@@ -7,6 +7,26 @@
 
 -- Assorted helper functions for the triggers.
 
+CREATE OR REPLACE FUNCTION get_center_point(place GEOMETRY)
+  RETURNS GEOMETRY
+  AS $$
+DECLARE
+  geom_type TEXT;
+BEGIN
+  geom_type := ST_GeometryType(place);
+  IF geom_type = ' ST_Point' THEN
+    RETURN place;
+  END IF;
+  IF geom_type = 'ST_LineString' THEN
+    RETURN ST_LineInterpolatePoint(place, 0.5);
+  END IF;
+
+  RETURN ST_PointOnSurface(place);
+END;
+$$
+LANGUAGE plpgsql IMMUTABLE;
+
+
 CREATE OR REPLACE FUNCTION geometry_sector(partition INTEGER, place geometry)
   RETURNS INTEGER
   AS $$
@@ -21,6 +41,7 @@ $$
 LANGUAGE plpgsql IMMUTABLE;
 
 
+
 CREATE OR REPLACE FUNCTION array_merge(a INTEGER[], b INTEGER[])
   RETURNS INTEGER[]
   AS $$
@@ -164,18 +185,44 @@ CREATE OR REPLACE FUNCTION get_country_code(place geometry)
 DECLARE
   place_centre GEOMETRY;
   nearcountry RECORD;
+  countries TEXT[];
 BEGIN
   place_centre := ST_PointOnSurface(place);
 
 -- RAISE WARNING 'get_country_code, start: %', ST_AsText(place_centre);
 
   -- Try for a OSM polygon
-  FOR nearcountry IN
-    SELECT country_code from location_area_country
-    WHERE country_code is not null and st_covers(geometry, place_centre) limit 1
-  LOOP
-    RETURN nearcountry.country_code;
-  END LOOP;
+  SELECT array_agg(country_code) FROM location_area_country
+    WHERE country_code is not null and st_covers(geometry, place_centre)
+    INTO countries;
+
+  IF array_length(countries, 1) = 1 THEN
+    RETURN countries[1];
+  END IF;
+
+  IF array_length(countries, 1) > 1 THEN
+    -- more than one country found, confirm against the fallback data what to choose
+    FOR nearcountry IN
+        SELECT country_code FROM country_osm_grid
+          WHERE ST_Covers(geometry, place_centre) AND country_code = ANY(countries)
+          ORDER BY area ASC
+    LOOP
+        RETURN nearcountry.country_code;
+    END LOOP;
+    -- Still nothing? Choose the country code with the smallest partition number.
+    -- And failing that, just go by the alphabet.
+    FOR nearcountry IN
+        SELECT cc,
+               (SELECT partition FROM country_name WHERE country_code = cc) as partition
+        FROM unnest(countries) cc
+        ORDER BY partition, cc
+    LOOP
+        RETURN nearcountry.cc;
+    END LOOP;
+
+    -- Should never be reached.
+    RETURN countries[1];
+  END IF;
 
 -- RAISE WARNING 'osm fallback: %', ST_AsText(place_centre);
 
@@ -436,6 +483,20 @@ END;
 $$
 LANGUAGE plpgsql IMMUTABLE;
 
+CREATE OR REPLACE FUNCTION simplify_large_polygons(geometry GEOMETRY)
+  RETURNS GEOMETRY
+  AS $$
+BEGIN
+  IF ST_GeometryType(geometry) in ('ST_Polygon','ST_MultiPolygon')
+     and ST_MemSize(geometry) > 3000000
+  THEN
+    geometry := ST_SimplifyPreserveTopology(geometry, 0.0001);
+  END IF;
+  RETURN geometry;
+END;
+$$
+LANGUAGE plpgsql IMMUTABLE;
+
 
 CREATE OR REPLACE FUNCTION place_force_delete(placeid BIGINT)
   RETURNS BOOLEAN