【正文】 o realize the horizontal scanning laser scanner body itself since circumferential rotation function can realize the vertical scanning, whenever the horizontal scanning after one cycle, will step into a scanner themes, in order to scan on the second level, so synchronization, achieve all the space of the scanning process. After each scan a cloud point, the CCD will cloud point information is converted into digital signals and transmitted directly to the puter system to calculate. The threedimensional coordinate data by measuring point is obtained. Scanner used automatic, realtime and adaptive laser beam is focused on the technical () in the different sights, in order to make sure each scan point cloud of the ranging precision and position accuracy is high enough. It can work in a very wide area and under the illumination of various plex environment. According to the target size and accuracy requirement, leica can bring different viewpoints to collect point cloud information after splicing processing merged into the same coordinate system, the bined approach is done through multiple scaling the ball. Operator using a portable puter can be remotely operated at the scene. The micro video camera in the sensor can provide realtime access to views. Video camera can be realtime monitoring and remote viewing the scanning process, can also be used to capture the required target images, so that the postprocessing of calibration work. Complete reconstruction goal, only from a scanning spot surveying and mapping the target data is not enough, must also be in different scanning observation points of surveying 16 圖 21 and mapping, and in the same space coordinate system and to generate, MENSI technology provides automatic merging of artificial auxiliary function, as long as the plan before scanning the target scan the content and goals can be set up calibration. As shown in figure 21. As shown in figure 22, the content of different observation point scanning point cloud to merge in the same space coordinate system, then cut off in the postprocessing software function module of irrelevant parts, then get the target 3 d reconstruction, the next job is to deal with point cloud quality (as shown in figure 23), smoothing and denoising, average filtering precision, variance processing, etc., thus get the purpose of the work can be used for various applications such as: surveying and mapping, measurement, etc., if again after dealing with the 3 d modeling, can be in need of 3 d entity model based on a variety of work role, such as: turn to all kinds of CAD software for processing, can be transformed to finite element analysis software for all kinds of stress analysis process, can be transformed to the fluid dynamic analysis software for processing, can be transformed for testing software for structural analysis, can convert to 3 d design software, reducing processing and inverse design in reverse engineering work, can be transformed into virtual reality software for 3 d visualization processing... , all in all, 3 d model based on point cloud and postprocess machining content is very rich, and is one of the many areas of indispensable content. 17 Point cloud is consists of countless of points 3 d laser scanning data, and the coordinates of each point is very important to the quality of the data. As shown in figure 24, processing technology is that it can be optimized point cloud data processing, such as: based on the precision distribution pattern to filter the noise points or bad points, so as to improve the overall accuracy and quality of reconstruction of target. 圖 22 圖 23 圖 24 18 technical characteristics Laser scanning technology in the development of major breakthrough to obtain high resolution earth space information provides a new technical means, 3 d visualization can be widely used in reverse engineering, landscape, digital city, military reconnaissance, surveying and mapping in areas such as space information quickly get {7}. Laser scanning measurement technology pared with traditional measurement technology cannot replace advantages, such as not restricted by weather and noncontact measuring method directly to obtain high precision 3 d data and so on. Laser scanning measuring the rapid development of the technology application in the field of surveying and mapping, surveying and mapping industry to bring a new technology revolution. (1) high data sampling rate. Can obtain large highspeed target entity space information. Leica Scan Station2 pulsed laser scanner to Scan rate, 50000 HP/SEC HDS6000 phase laser scanners Scan rate 500000 damage per second, application of laser scanning measurement technology for space target entity 3 d information acquisition speed is very fast, can realtime determination of solid surface 3 d information, which can be applied to deformation monitoring and other fields. (2) realtime, dynamic, initiative. The ground threedimensional laser scanning system through active laser signal, the reflection prism launch and receive back the laser signal to obtain the target information, not be restricted by external conditions, such as lighting, air pressure, realtime observation can throughout the day. (3) the noncontact. 3 d laser scanning system is through the transmitted pulse signal and receiving the reflected pulse signal measured object surface shape information of target acquisition and measurement. Thus the process without the need of human contact to be 19 measuring objects, which makes the technology can be widely used in the dangerous areas and survey