![]() The satellite-based LiDAR measurement belongs to the direct active acquisition of surface elevation information, which is different from the traditional indirect reconstruction measurement mode of remote sensing imaging mapping, reducing the time of post-processing process and improving the efficiency of surface 3D information acquisition. The satellite-based LiDAR measurement is performed by transmitting laser pulses at a certain frequency from the satellite-based laser to the ground, and the laser beam crosses the atmosphere and is scattered by the terrain surface, producing a weak backscattered echo, which is received by the telescope on the satellite-based LiDAR, and the distance value between the laser and the detection target is calculated through photoelectric signal conversion and time measurement, and then combined with the information of satellite attitude, platform position, and laser pointing to finally obtain precise three-dimensional spatial coordinates of the laser footprint point, as shown in Figure 2. The rapid development of satellite-based LiDAR measurement technology has brought a new breakthrough in the field of satellite-based earth observation, and the significant advantages of all-day, high-precision and high-efficiency will definitely lead the future development direction of aerospace remote sensing and mapping technology. The development of satellite-based LiDAR measurement means can effectively improve the overall geometric accuracy of earth observation, provide basic 3D topographic data support for the comprehensive application of various types of remote sensing satellite images fill in the gaps of geospatial information in the polar regions and provide high-precision 3D frame information support for precise location services. First, the elevation accuracy is improved by 5–10 times second, the data processing is highly automated and third, the overall acquisition cost is significantly reduced. ![]() (TOP: LIST satellite for example Bottom: DSM).Ĭompared with the existing or developing optical or microwave remote sensing mapping satellites, it has the advantages of high accuracy of observation data and fast information acquisition efficiency. Schematic diagram of satellite-based LiDAR measurement. This chapter firstly introduces the principle and development status of satellite-based LiDAR technology, then presents the basic technical framework of satellite-based LiDAR 3D mapping, and analyzes the data processing methods of spaceborne photon point clouds, and finally, focuses on the application research in various fields including precise geolocation of combined with satellite images, fusion of multi-source topographic information, polar mapping, 3D objects reconstruction, and shallow sea topographic mapping, etc. The rapid advancement of spaceborne laser earth observation technology allows the collection of global 3D point cloud data, which has brought a new breakthrough in the field of satellite-based earth observation, and its significant advantages of all-day time, high accuracy and high efficiency will lead the future development of space precise mapping technology. ![]() It will be one of the core datasets of the new generation national global topographic database. (Translated by machine.Laser point cloud data have the characteristics of high elevation accuracy, fast processing efficiency, strong three-dimensional (3D) vision, and wide application fields. Our latest report focuses on the importance of surveying and mapping technology and application research, involving land surveying, engineering, remote sensing, photogrammetry, cartography, geographic information systems, mine surveying, marine surveying and mapping, cadastral mapping, map printing, surveying and mapping equipment, information transmission and other mapping and related disciplines adjacent disciplines. The journal publishes in both the English text of the paper. Journal founded in 1957, is director of China Association for Science, sponsored by China Institute of Surveying and Mapping Surveying and Mapping Science and Technology reflects the level of development of national comprehensive academic journal, impact factor and citation frequency ranking first in Chinese core journal Surveying, China Mapping the most influential journals, Ei core journals, journal impact factor is technology the only Top 40 Journal of Surveying and Mapping, surveying and mapping is also referred to the International scientific and technological exchanges of the primary literature.
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