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In 1984, there are researchers engaged in airborne laser terrain measurement study, and gives the measurement results. University of Stuttgart, Germany, Institute of Photogrammetry in 1988, the airborne laser scanning terrain cross-section measurement systems; Dutch surveying department since 1988, began to engage in a feasibility study using laser scanning technology to extract topographic information; University of Calgary, Canada 1998 airborne laser scanning system integration and test, through the integration of the laser scanner purchased with GPS, INS and data communications equipment, to achieve an airborne laser scanning three-dimensional data acquisition system, and a certain scale trials achieved the desired results. The customer has to state the customization requirement ofchina laser pointerclearly in advance.
The University of Tokyo, Japan, in 1999, ground fixed laser scanning system integration and test. In the 1990s, along with related technologies continue to mature, airborne laser scanning altimetry has been booming, Europe and the United States and other developed countries has developed a variety of airborne laser scanning system, such as TopScan, Optech, the Top the Eye, Saab , Fli-map, TopoSys, Hawk2Eye a variety of practical systems. Leica introduced the Leica ALS40 of airborne laser scanning altimeter. According to statistics, as of July 2001, about 75 commercial organizations use a similar system of more than 60 kinds, from the 1998 rate of 25% per year increase. With the airborne laser scanning altimetry continues to mature, and its expanding range of applications. Measuring the development of low-altitude airborne system the United States, Canada, Australia, Sweden and other countries for the shallow water terrain, the use of airborne laser distance measuring equipment, global positioning systems, gyro stabilized platform and other equipment directly to the ranging and positioning, and ultimately shallow sea terrain. The director has some suggestion towards the logo ofchina laser pointer.
The typical U.S. military is now a unique underwater topography of laser scanning measurement system using laser radar technology to the implementation of the shallow water depth of long-distance measurement and surveying and mapping the topography of the coastal zone, monitoring coastal erosion. The system was officially put into use in March 1994. HARC's laser radar topography measurement system uses a scanning laser rangefinder using GPS positioning, attitude measurement device is estimated that the inertial navigation system. It is understood that this system is nominal to "overnight" to provide the DEM, DEM generation speed is several times faster than conventional methods and can achieve near real-time positioning of the remote sensing information and generate the DEM, and efficiency than the existing access to information technology increased by about a few times. Using of green laser pointer will help the teacher make better speech in the class.
Bureau of Surveying and Mapping of the German federal government in 1994 began to study the use of laser scanning technology to obtain a digital terrain model, to obtain ground truth orthophoto data filtering and classification, separate ground point with the point of buildings or vegetation. SMA sector in Germany has been in several states now use laser data to generate high-quality DTM test results are very satisfactory, especially in the forest, up to the accuracy even better than the accuracy obtained by the three-dimensional photography editing France. Netherlands has a nationwide spatial resolution airborne laser altimetry digital elevation models, data collection has reached every 16m there is a sampled data. NASA also developed the airborne laser vegetation imaging sensor system, the system can be used for the investigation and management of forest resources, including projections of vegetation parameters and forest vertical structure, such as tree height, crown diameter, tree density, vegetation growth, timber volume, tree species. Airborne laser scanning high-tech research in the country is still in its infancy. The customer is very interested in the document browsing function of china laser pointer.
Beijing Institute of Remote Sensing Applications, Professor Li Shukai airborne laser scanning ranging - imaging system in 1996, completed the development of the prototype of the system, the system is also different from the internationally popular airborne laser scanning altimetry system it laser rangefinder and multispectral scanning imagers share a set of two optical systems, through the hardware to achieve an exact match of DEM and remote sensing images, direct access to referenced image, but the system from the utility is still some distance. Wuhan University Professor Li Qingquan developed a ground-based laser scanning system, but not yet integrated with positioning and orientation system, mainly used for accumulation of measurement. The country there is no high-precision INS system, and reliable laser scanning DME, the domestic is still not mature airborne laser scanning system. There is still a minor technical problem in the anti-interference function ofchina laser pointer.