code: public int getDistanceMeters(Extent boundingBox) {
  		return new Double(Math.floor(Calculator.latLonDist(boundingBox.getMinX(), boundingBox.getMinY(),
  				boundingBox.getMaxX(), boundingBox.getMaxY()))).intValue();
  	}
docs: Utility method to get the distance from the bottom left corner of the
  bounding box to the upper right corner
  
  @param boundingBox
  The bounding box
  @return The distance in meters