def split_laps_into_tracks_if_needed(tracks)
    #let's try and be smart about splitting laps into their own tracks
    #automatically, based on two conditions: time between laps is > 24 hours
    #or one lap has location data and another lap doesn't.
    new_tracks = []
    tracks.each do |trk|
      if trk[:segments].length == 1
        new_tracks << trk
        next
      end

      #if two adjacent tracks have location/not location, split off first
      laps = []
      prev = nil
      trk[:segments].each do |seg|
        if prev.nil?
          prev = seg
          next
        end

        prev_first = trk[:track][prev[:start_index]]
        prev_has_loc = prev_first[:x] and prev_first[:y]
        first = trk[:track][seg[:start_index]]
        cur_has_loc = first[:x] and first[:y]

        if (prev_has_loc and !cur_has_loc) or (!prev_has_loc and cur_has_loc)
          #split previous lap into its own track
          points = trk[:track].slice!(prev[:start_index]..prev[:end_index])
          new_tracks << {
            :segments => [{:start_index => 0, :end_index => points.length-1}],
            :pois => [],
            :course_points => [],
            :track => points
          }
        end

        prev = seg
      end
      new_tracks << trk
    end
    return new_tracks
  end