+
+ # Return an SQL fragment to select a given area of the globe
+ def self.sql_for_area(minlat, minlon, maxlat, maxlon)
+ tilesql = QuadTile.sql_for_area(minlat, minlon, maxlat, maxlon)
+ minlat = (minlat * 1000000).round
+ minlon = (minlon * 1000000).round
+ maxlat = (maxlat * 1000000).round
+ maxlon = (maxlon * 1000000).round
+
+ return "#{tilesql} AND latitude BETWEEN #{minlat} AND #{maxlat} AND longitude BETWEEN #{minlon} AND #{maxlon}"
+ end