What is tilt photogrammetry and what are its main applications at present?

Tilt photogrammetry is to carry multiple sensors on a flight platform, collect ground image data from vertical and oblique angles at the same time, and obtain accurate and complete ground object position information and texture data after data processing.

The workflow is divided into two parts: field work and indoor work. The main work of the field is data collection, that is, using the tilt camera installed on the flight platform to obtain aerial photos, which are handed over to the field. Indoor owners should carry out data processing, including importing aerial photos into professional processing software for aerial three-dimensional encryption operation and model making. This link is often a high-risk stage, which will waste 70% of the project's time to deal with.

Field data collection needs skilled and stable flying hands, safe and stable flying platforms and cameras with stable work and excellent performance. Flying platforms are generally multi-rotor UAVs and fixed-wing UAVs. At present, DJI is the only consumer. The tilt camera has Chengdu Ruibo. Flying hand of UAV is one of the most uncontrollable factors. There have been many times in the industry. After the drone took off, the flying hand immediately immersed in the game, only to find that the drone did not come back after dark.

At present, mainstream applications include the following aspects:

1, protection of ancient buildings. For example, the protection of the ancient city wall in Xi 'an. Through the close-range photogrammetry technology of UAV, the image data of the ancient city wall and its affiliated buildings are obtained, and the ancient city wall and buildings are reconstructed in three dimensions, so as to realize the digitalization and informatization of the ancient city wall and help the management and protection of the ancient city wall.

2. Smart city: The 3D model is dynamically cropped by using the vector range collected based on the 3D model, and the 3D model is logically simplified by combining the vector information to meet the requirements of refinement, so as to realize the comprehensive management of real 3D data, high-precision topographic data, orthophoto data, land spatial planning data, CAD topographic map, completion data, cadastral data and other natural resource information.

3. Cadastral and topographic mapping: real estate and real estate integration project: the registration of the right to use rural homestead and collective construction land is being carried out all over the country. With the deployment and imminent implementation of new strategies such as "smart city" and "integration of multiple surveys", this work is stepping up.

4. Planning and design: for example, the planning and design of auxiliary bridges. Combining BIM technology to realize three-dimensional design of bridge structure. At the same time, BIM modeling technology is used to realize real-time dynamic adjustment and three-dimensional dynamic display of bridge design scheme.

In addition, it is also used in the power industry, such as line inspection and tower inspection; Plant protection; Forestry, etc. With the continuous progress of technology, the application scope of tilt photogrammetry will be more and more extensive.