The difference between five-eye photography and lidar

Photogrammetry: extract the information of the research object from the photographed image, determine the shape, size, spatial position, attributes and interaction of the target object, and then form a three-dimensional drawing.

Lidar (Light Detection and Ranging): A system integrating laser, Global Positioning System (GPS) and Inertial Navigation System (INS) is used to obtain data and generate accurate digital elevation model (DEM).

Compared with the traditional photogrammetry technology, lidar technology has many advantages. For example, the data density of lidar is high, and the distance between collected data points can reach 0.15m or even less, so the collection density is extremely high. The data accuracy is high, and the laser has extremely high directional directivity, which is not affected by aerial survey height; Vegetation has a strong penetration ability, and the real terrain of the ground covered by vegetation can be detected through the narrow gap of vegetation; Rich in data, you can collect information of various goals, generate rich and diverse products and so on.