What are the characteristics of aerial photogrammetry technology?

Jun 25, 2023

Aerial photogrammetry technology includes a variety of leading science and technology, and has shown many advantages in practice, focusing on small size, rapid response, good accuracy, and low flight conditions. Compared with the traditional topographic surveying technology, the application of aerial photogrammetry technology to achieve topographic surveying and mapping accurately, effectively and quickly is also an important technical method for the design of topographic surveying and mapping technology for water conservancy projects.

1. Stability of aerial photogrammetry technology

In the practice of aerial photogrammetry, the range of sub-meter level accuracy ranges from 0.1 to 0.5m, which fully meets the mapping requirements related to digital topographic surveying. The design of the aerial photogrammetry system is to independently complete the flight plan production according to the work requirements in the early stage of the aerial photography work, including the flight route and aerial photography point setting, etc.; Point orientation, phase amplitude radiation range, flight direction and its latitude and longitude coordinate axis, altitude, etc.; Find areas for re-shooting, and when conditions permit, re-shooting can also be carried out in a timely manner, assisting technicians to efficiently carry out flight and shooting work.

2. Safety of aerial photogrammetry technology

my country's land area ranks third in the world. It has a vast territory, and its topography and climate are very complex and changeable. A few areas are affected by extreme weather, such as being covered with snow all year round. The use of satellite remote sensing to collect information will be subject to corresponding interference. Traditional topographic measurement methods are subject to the influence of clouds and terrain, which is prone to errors and deviations. At the same time, it brings potential risks to scientific and technical personnel and operators, and access to border areas is also limited. on border issues. The use of aerial photogrammetry technology can avoid the above problems very well, and will not be restricted by the altitude and topography. The image quality and accuracy completely surpass the measurement effect of human-controlled aircraft aerial photography and geological scientific research personnel.

3. Flexibility of aerial photogrammetry technology

Aerial photogrammetry is generally low-altitude flight, the airspace operation is convenient, and it will not be affected by extreme weather. At the same time, it is not limited to the needs of take-off and landing sites, and only needs to choose a relatively flat site for take-off and landing. In the process of collecting aerial photographs, the risk of pilots themselves can be ignored. In the process of data collection, the demand for geographical airspace and meteorological conditions is not high, and manual detection can be realized in areas that cannot be monitored. In addition, the aerial photogrammetry equipment only needs 15 minutes of preparatory work to be ready for flight, the control is not complicated, the tool transportation is convenient, and the daily reference personnel requirements can collect 200km² topographic measurement information. Compared with the traditional high-resolution satellite remote sensing, the traditional method has two major problems. First, the data storage time interval is very long. Secondly, assuming new impacts are collected, the shooting cycle is long, and impact information cannot be stored at any time. Therefore, the advantages of aerial photogrammetry are that the time is very flexible, the required time is very short, and the work continuity is strong at the same time, and it can be photographed and stored in time, and processed in time. Compared with satellite and artificial machine surveying and mapping, it can achieve less time-consuming and faster Provide customers with finished images.