Photogrammetric characteristics

Photogrammetry is to measure the measured object by using remote sensing equipment such as sound, light and electricity (camera, scanner and radar) to generate pictures or audio-visual materials. It is generally considered as "photo-measurement". Features: Without touching the target, the three-dimensional information of the target is obtained from the two-dimensional image, and the positioning accuracy is high (general); The processing flow is complex and needs internal orientation, relative orientation and absolute orientation; A variety of products can be obtained: 4D products; The image is intuitive and easy to distinguish manually; However, photography is bound to be limited by the scope of a single photo. Close-range shooting is at the level of 100 meters, and the flight resolution is also different, but it is generally higher than remote sensing.