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A LIDAR Technological System for Acquiring Quickly 3D Terrain Data

LI Ying cheng,WEN Wo gen(Chinese Academy of Surveying and Mapping)  
The airborne laser scan system LIDAR for acquiring 3D terrain data is a new advanced technological system. It's an advanced and active remote sensing system. The LIDAR itself emits the laser controlled to illuminate the Earth and the objects on it. It is not the dependence of sunshine. So LIDAR is a system which can acquiring 3D terrain data day and night.There are the advantages of high precision,high density,high efficient and low cost in LIDAR, so that its method of aquiring directly 3D terrain data is better than the conventional survey. The post processing technology can seperate pure terrain from the other canopy surface, and can measure the DTM,DSM and vegetation data simultaneously.
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