Lidar Introduction

The working principle of Lidar is very similar to that of radar. With laser as the signal source, the pulsed laser emitted by the laser hits the trees, roads, bridges and buildings on the ground, causing scattering, and some of the light waves will be reflected to the laser radar. On the device, according to the laser ranging principle calculation, the distance from the laser radar to the target point is obtained, and the pulse laser continuously scans the target object, and the data of all the target points on the target object can be obtained, and after the imaging processing is performed by using the data, Accurate three-dimensional images are available. Due to its strong anti-interference, high resolution and small size, Lidar is widely used.

The laser scanning method is not only the main way to obtain 3D geographic information in the military, but also the data obtained through this method is widely used in resource exploration, urban planning, agricultural development, water conservancy engineering, land use, environmental monitoring, traffic communication, and earthquake prevention. Disaster reduction and national key construction projects have provided extremely important raw materials for national economic, social development and scientific research, and have achieved remarkable economic benefits and demonstrated good application prospects. Compared with the traditional measurement method, the low airborne LIDAR ground three-dimensional data acquisition method has the advantages of low production cost and post-processing cost. At present, users are in urgent need of low-cost, high-density, high-speed, high-precision digital elevation data or digital surface data. The airborne LIDAR technology meets this demand, and it has become a popular high-tech in various measurement applications.