gc = OSM::GreatCircle.new(home_lat, home_lon)
sql_for_area = QuadTile.sql_for_area(gc.bounds(radius), "home_")
sql_for_distance = gc.sql_for_distance("home_lat", "home_lon")
gc = OSM::GreatCircle.new(home_lat, home_lon)
sql_for_area = QuadTile.sql_for_area(gc.bounds(radius), "home_")
sql_for_distance = gc.sql_for_distance("home_lat", "home_lon")