# Return an SQL fragment to select a given area of the globe
def self.sql_for_area(minlat, minlon, maxlat, maxlon, prefix = nil)
tilesql = QuadTile.sql_for_area(minlat, minlon, maxlat, maxlon, prefix)
+
minlat = (minlat * 10000000).round
minlon = (minlon * 10000000).round
maxlat = (maxlat * 10000000).round