METHOD OF SURVEYING STRUCTURAL FACILITIES ALONG ROAD BY USING AERIAL PHOTOGRAPH AS WELL AS VEHICLE WITH GPS RECEIVER AND LASER MEASURING INSTRUMENT

摘要

The present invention relates to a GPS receiver, a vehicle equipped with a laser meter, and a road surveying facility using aerial photographs. According to the present invention, the initial position coordinates of the vehicle are acquired through the GPS receiver, and the laser light is output at right angles to the driving direction while driving the vehicle along the road. When the vehicle reaches the first position, the laser light reflected at the first point of the facility is detected at the laser meter and acquires the first position coordinates of the vehicle via the GPS receiver. The first distance of the facility is calculated from the arrival time of the laser light, and the driving azimuth angle of the vehicle is calculated from the initial position coordinates and the first position coordinates of the vehicle. Further, the first point coordinate of the facility is calculated from the first position coordinates, the driving azimuth angle, and the facility distance of the vehicle. In the same manner, the second position coordinates of the vehicle, the second distance of the facility, and the second point coordinates of the facility are respectively calculated. The two point coordinates of the facility are then extracted from the aerial image and a planar image of the facility is obtained. This method can be applied very easily when acquiring local digital terrain data such as facilities around roads, high accuracy can be obtained by using the laser's straightness, and facilities that are difficult to grasp using GPS receivers and laser instruments. By acquiring a variety of plane image information together, the accuracy and utilization of digital terrain data can be improved.;Geographic Information System (GIS), Global Positioning System (GPS), Digital Maps, Positioning, Roads, Nearby Facilities, Surveying Vehicles, Laser Instruments, Aerial Photography