Use QuadTiling in GPS point queries.

app/models/tracepoint.rb

@@ -1,11 +1,17 @@
 class Tracepoint < ActiveRecord::Base
-set_table_name 'gps_points'
+  set_table_name 'gps_points'
 
 #  validates_numericality_of :latitude
 #  validates_numericality_of :longitude
 
   belongs_to :user
   belongs_to :trace, :foreign_key => 'gpx_id'
+ 
+  def self.find_by_area(minlat, minlon, maxlat, maxlon, options)
+    self.with_scope(:find => {:conditions => OSM.sql_for_area(minlat, minlon, maxlat, maxlon)}) do
+      return self.find(:all, options)
+    end
+  end
 
   def lat=(l)
     self.latitude = l * 1000000
@@ -29,5 +35,4 @@ set_table_name 'gps_points'
     el1['lon'] = self.lon.to_s
     return el1
   end
-
 end