Digital photography three-coordinate measuring system for large-scale three-coordinate measuring system

Digital photogrammetry is to obtain more than two digital images of the same object in different positions and directions, and obtain the accurate three-dimensional coordinates of the point to be measured through computer image matching and related mathematical calculation. Its measuring principle is the same as that of theodolite measuring system, and it is a triangle intersection method.

Digital close-range photogrammetry system is generally divided into single camera off-line measurement system and multi-camera on-line measurement system. This system, like other systems, has the characteristics of high precision, non-contact measurement and portability. In addition, it also has incomparable advantages over other systems: small workload, high speed, high efficiency, and is not easily disturbed by external factors such as temperature change and vibration. There are also many foreign manufacturers and products, such as the V-STARS department of American GSI company.