This lesson uses DJI drones as an example to introduce the workflow of photogrammetry. UAV photogrammetry technology is a low-altitude aerial photography remote sensing system that uses UAV as the flight platform and uses high-resolution digital cameras, air and ground control systems and other equipment to realize track planning and monitoring, automatic shooting, acquisition, transmission and preprocessing of images. Industry application scenarios include basic surveying and mapping, spatial planning, natural resources, engineering surveying and mapping, etc. UAV surveying and mapping can efficiently build a real-world 3D model, intuitively reflect the geomorphology and building information, eliminate personnel from going deep into the survey area, obtain high-precision 2D data, protects personnel safety, and improve production efficiency.