This paper describes the use of secondary-development of Auto-lisp,automatic extraction of road princi-pal point coordinates and curve line element feature. The design data generate a corresponding road data file format. This data file was transmitted via Bluetooth or a datcable to the GPS or total station memory,and imported lofting software,the instrument coordinate lofting program was used to lofting and setting out survey on-site,thus enabling rapid integration lofting. Practice show that it greatly improve the efficiency of construction and lofting,avoid manual entry errors,reduce the the...
