-- ocitysmap, city map and street index generator from OpenStreetMap data
-- Copyright (C) 2009  David Decotigny
-- Copyright (C) 2009  Frédéric Lehobey
-- Copyright (C) 2009  David Mentré
-- Copyright (C) 2009  Maxime Petazzoni
-- Copyright (C) 2009  Thomas Petazzoni
-- Copyright (C) 2009  Gaël Utard

-- This program is free software: you can redistribute it and/or modify
-- it under the terms of the GNU Affero General Public License as
-- published by the Free Software Foundation, either version 3 of the
-- License, or any later version.

-- This program is distributed in the hope that it will be useful,
-- but WITHOUT ANY WARRANTY; without even the implied warranty of
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-- GNU Affero General Public License for more details.

-- You should have received a copy of the GNU Affero General Public License
-- along with this program.  If not, see <http://www.gnu.org/licenses/>.

-- Create a partial index to speed up the city name lookups (a few
-- milliseconds versus a few minutes):
create index admin_city_names
       on planet_osm_line (boundary,admin_level,name)
       where (boundary='administrative' and admin_level='8');

-- Create a view that associates each city with an area representing
--  its territory, based on the administrative boundaries available in
--  OSM database.

create or replace view cities_area_by_name
   as select name as city, st_buildarea(way) as area
   from planet_osm_line where boundary='administrative' and admin_level='8';

-- Create a similar view that associates each polygon ID with an area
--  representing its territory, based on the administrative boundaries
--  available in OSM database.

create or replace view cities_area_by_osmid
   as select osm_id, st_buildarea(way) as area
   from planet_osm_polygon where boundary='administrative' and admin_level='8';

-- Create an aggregate used to build the list of squares that each
-- street intersects

CREATE AGGREGATE textcat_all(
  basetype    = text,
  sfunc       = textcat,
  stype       = text,
  initcond    = ''
);