code: public double distanceTo(final double LAT, final double LON) {
          final double EARTH_RADIUS = 6371000.0; // m
          return Math.abs(Math.acos(Math.sin(Math.toRadians(LAT)) * Math.sin(Math.toRadians(this.lat)) + Math.cos(Math.toRadians(LAT)) * Math.cos(Math.toRadians(this.lat)) * Math.cos(Math.toRadians(LON - this.lon))) * EARTH_RADIUS);
      }
docs: Returns the distance in meters of the poi to the coordinate defined
  by the given latitude and longitude. The calculation takes the
  earth radius into account.
  @param LAT
  @param LON
  @return the distance in meters to the given coordinate