def has_valid_bbox?
not bbox.include? nil
end
+
+ ##
+ # returns area of the changset bbox as a rough comparitive quantity for use of changset displays
+ def area
+ if has_valid_bbox?
+ (max_lon - min_lon) * (max_lat - min_lat)
+ else
+ 0
+ end
+ end
##
# expand the bounding box to include the given bounding box. also,