With the advantages of high efficiency, flexibility and low cost, UAV tilt photography technology is gradually subverting the traditional surveying and mapping operation mode and has become the "new favorite" of the surveying and mapping industry. Applying tilt photography technology to UAVs is actually making a three-dimensional model, and the model built is more realistic, more intuitive and more practical.

When surveying and mapping the expressway

For the maintenance and reconstruction of large-scale traffic infrastructure such as highways, the first step is to obtain clear images of all road conditions. In the past, such large-scale tasks usually required manual or helicopter operations to complete. Manual inspection takes too long, and the cost of helicopter inspection is too high. In comparison, UAV has many advantages, such as low cost, high efficiency, high precision, and is the best choice for road mapping. The UAV surveying and mapping system applied by Qifei integrates the UAV for surveying and mapping (fixed wing/multi rotor), 3D modeling software (PIX4D) and GIS application program (RisingSpace GIS smart city software system). With the powerful workstation of Qifei, The GIS application software of Qifei can also be used to accurately assess the quantities of road reconstruction, and simulate the scene effect and possible surrounding environmental impact after the reconstruction, providing strong support for road reconstruction and road planning work of the highway department.

Bridge inspection

The bridge inspection is mainly to check and assess the appearance and structural performance. Usually, the inspection of structural performance is completed through a series of mechanical tests. The appearance inspection mainly relies on the naked eye or auxiliary tools (such as bridge inspection vehicle, telescope, etc.) to detect whether the main components of the bridge have cracks, cracks, damage, exposed reinforcement corrosion, bearing void and other diseases. Traditional bridge detection mostly uses relevant special instruments to measure, record and count various parts of the bridge. In this process, maintenance personnel need to hang under the bridge or start detection from the elevated platform. For special structure bridges (such as cable-stayed bridges, suspension bridges, concrete-filled steel tubular arch bridges, etc.) or long-span and high pier bridges, traditional detection tools can hardly be used, and can only return to the original form of manual detection. Manual detection not only has low efficiency, great difficulty and high risk coefficient, but also is far from precise enough. The application of UAV technology will solve this problem to a large extent. The UAV can take photos of the bridge bottom, cylinder, beam and other structural surfaces through cameras, laser radars and other control equipment, and can also carry out three-dimensional modeling of the whole bridge, calculate the external structure of the bridge through the model, so that professionals can analyze the bridge status and find dangerous situations in a timely manner, which can greatly reduce the work intensity of bridge maintenance personnel, Improve the efficiency of bridge inspection and maintenance.

Reactor body measurement

The application range of stack measurement is very wide. The measurement of soil piles and sand piles during the construction of mines, thermal power plants, construction projects, the estimation of bulk cargo at ports and docks, and the estimation of grain piles in granaries are all inseparable from stack measurement technology. At present, the stack measurement mainly relies on total station, coal pan meter, GPS and other measuring instruments to measure the stack. Compared with the earlier ones, which completely rely on manual measuring with tape, these measuring methods have made great progress. However, today there is a more efficient and high-precision measurement method: mapping and modeling using unmanned aerial vehicles. The UAV can preset the route and automatically collect data over the operation area. After collecting the data, it can import the independently developed GIS system of the takeoff application, generate point cloud and 3D model data with one key, and then measure the spatial distance and volume, or conduct analog measurement of irregular stack area such as slope, It provides accurate numerical reference for engineering construction planning and production operations.

Tunnel and pipeline inspection

The traditional detection of subway, railway and automobile tunnels requires inspectors to go deep into the inside of the tunnel, manually check whether there are cracks or water leakage and other abnormalities, and ensure that the tunnel structure is free of problems. This method relies too much on manpower, has low efficiency and has certain safety risks. As a traffic channel, subway, railway and automobile tunnels also have very limited spare time for inspectors, which further increases the difficulty of detection work. The UAV equipped with high-definition camera, laser radar and other detection equipment can collect high-precision image data in the tunnel and generate a three-dimensional model for retrieval and viewing at any time. This not only can provide higher inspection accuracy, but also allows engineers to spend more time focusing on the analysis of the collected data and quickly propose the countermeasures to be taken.

Confirmation of land right

The traditional land right confirmation survey is generally to measure topographic maps through ground engineering survey or traditional aerial survey by manned aircraft. Compared with traditional methods, aerial photogrammetry by UAV has obvious advantages, such as low cost, convenient implementation, high automation, high efficiency and high accuracy. Therefore, in the work of rural collective land registration, confirmation and certification, it is a more feasible way to obtain basic topographic map data through UAV aerial photography modeling. The UAV used by Qifei is equipped with a five lens camera, which can collect data and photograph large areas of land within the scope of rural collective land, obtain high-precision three-dimensional surface data, and then conduct rapid three-dimensional modeling through the side view image of collaborative work, draw a large-scale topographic map, and assist in the smooth progress of the registration and certification of rural collective land ownership.

Archaeological restoration

The UAV 3D modeling technology can also be used for archaeological and cultural relic restoration work. The 3D scanning technology replaces the traditional point data acquisition with the area data acquisition. Through the high-speed laser measurement method, the 3D information of objects can be obtained quickly, accurately and comprehensively, the real 3D information of cultural relics can be recorded truly, and the 3D model can be established. The traditional manual measurement is transformed into the high-precision measurement of point cloud data by indoor computer, which is non-contact, The damage to cultural relics was avoided. Some large cultural relic buildings are tens of meters high, which is not only a huge amount of work, but also difficult to record complex patterns and key parts, which is very difficult for traditional surveying and mapping. However, through 3D panoramic scanning, point clouds can accurately reflect the spatial position, and high-density point clouds with color values realize information visualization. These technologies can be used to improve the accuracy of cultural relics restoration, pre judge, select the protection means to be used, and shorten the restoration period;