What are the functions of aerial photography?

Aerial photography refers to the installation of aerial cameras on airplanes (airplanes, helicopters, drones, etc.) to photograph the earth's surface from the air. ) follow the designed route. It is mainly used to make topographic maps of various scales, and it is the first process of aerial photogrammetry.

Aerial photography can be divided into large-scale, medium-scale and small-scale aerial photography according to the difference of flying height, focal length of aerial camera and mapping scale. Its characteristics are: high-resolution ground images can be obtained, which is suitable for detailed research on detection targets; There is great flexibility in time and space, and the flight time and area can be adjusted at any time as needed; The flight speed is fast, and a large amount of ground image information can be obtained quickly.

Compared with traditional mapping methods, aerial photogrammetry uses indoor precision measuring instruments to describe the terrain and interpret aerial photographs, which can greatly reduce the hard field workload. Thereby reducing labor intensity, improving work efficiency and drawing quality, shortening drawing cycle and reducing production cost, and having the advantages of rapidity, accuracy, economy and the like. Aerial photographs are also widely used in agriculture, forestry, geology, petroleum, water conservancy, urban planning, environmental protection, railways and highways, military and other fields. China Civil Aviation has a flying team specialized in aerial photography.