With ridges and ridges, sections of the ancient Great Wall are being presented digitally with "centimeter-level" high precision through technologies such as drones and three-dimensional laser scanning. Recently, the construction of the Great Wall Cultural Belt in Yanqing, Beijing began to resume work on the Badaling Great Wall marked by the "Great Wall Survey, Mapping and Protection Information System Construction Project". As the data collection on the 26.6-kilometer Masonry Great Wall in Yanqing is coming to an end, the construction of a high-precision three-dimensional model will be completed by the end of May.

my country’s current aerial surveying survey standard accuracy is 5 cm, and because of the particularity of the Great Wall cultural relics, the surveying accuracy of the Great Wall in Yanqing District is better than 2 cm. At the same time, the close-to-tilt photogrammetry technology is also used for the protection of the Great Wall for the first time. Various collected data are processed in the background to form the Great Wall ontology model and surrounding high-precision photos that can be browsed, measured, and counted in three dimensions. After the Great Wall’s “digital archives” are built, it will provide basic data support and convenient services for the development of scientific, humane, and refined Great Wall management and protection measures in the future.

After the completion of the 3D modeling work, the staff can use drone remote sensing inspection and IoT monitoring technology to monitor disease factors and changes on the Great Wall, and the acquired data can be automatically compared with the built model, thereby Accurately monitor various changes in the Great Wall's main body disease and surrounding environment. In addition, using the air superiority of drones and the precise collection of Great Wall data, new buildings within the protection area of ​​the Great Wall will have nowhere to hide. If there is an illegal construction, the system will issue an alarm during the comparison process, and the cultural relics department will work with relevant departments to investigate and deal with it, and take the lead in the city to form the "eye control" of illegal occupation of the Great Wall cultural relic space.