What are the current applications of 3D real scenes created by oblique photogrammetry?

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.

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 cities

Using the vector range based on 3D model acquisition, the dynamic clipping of 3D model is realized. Combined with vector information, the logic of three-dimensional model is simplified to meet the requirements of refinement, and the comprehensive management of true three-dimensional data, high-precision terrain data, orthophoto data, land spatial planning data, CAD topographic map, completion data, cadastral data and other natural resource information is realized.

Compare the designed BIM scheme with the actual three-dimensional scene, realize the scheme design comparison, monitor the implementation progress of major projects, and meet the requirements of natural resources monitoring and land spatial planning implementation monitoring. Combining the three-dimensional model of the real scene on the ground with the underground pipeline, the three-dimensional map of urban natural resources is constructed to realize the all-round management and service of urban natural resources on the ground and underground.

3. Open pit mine management

In open-pit mining activities, the mining field is digging deeper and deeper. If the production department wants to better grasp the changes of the pit and the site, it can use the surveying and mapping results of drones as the overall map of the mining area, and technicians and managers can view the whole area at any time. Using unmanned aerial vehicle (UAV) to collect data and professional modeling software, three-dimensional model of mining area can be generated quickly, which greatly improves the work efficiency and reduces the safety risk of surveyors.

5. Planning and design

Such as auxiliary bridge planning and design. 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.

What are the main applications at present?

In view of the above-mentioned smart city, open-pit mining, planning and design, I will tell you what applications have been integrated:

Aerial photography modeling, also known as oblique 3D, is a GIS technology that has developed rapidly in recent years. By using multiple sensors carried by aircraft or unmanned aerial vehicles, the ground objects are photographed and collected from five directions: front, back, left and right, and vertical, so as to obtain data information that truly reflects the ground situation quickly and efficiently. Through a series of indoor processing operations such as correction, adjustment and multi-view image matching, the three-dimensional model is finally obtained.

The comparison between aerial photography modeling and manual modeling is as follows:

In addition to the above characteristics, the data of aerial photography modeling also has geographic coordinate system information, which can be accurately matched with GIS. Manual modeling needs manual spatial correction registration to cooperate with GIS. The OSGB model data of aerial photography modeling has multi-level details (LOD), and the system can display LOD models with different accuracy according to the distance between the user's browsing time and the scene, thus improving the efficiency of data display and rendering.

Smart City

Digital management is to realize the convergence, integration and * * * sharing of urban multidimensional business data, and realize the integration of operation and maintenance management through visualization technology. Hightopo visualization engine and related technologies of geographic information system (GIS) provide roaming routes based on latitude, longitude and altitude data.

Compared with traditional video surveillance, video surveillance integrated with GIS can quickly locate the specific monitoring location. When an accident happens, it can not only quickly locate the incident location, but also quickly view the regional situation information.

Open pit mining/open pit mining/open pit mining

It also provides a solution to display mining areas in combination with GIS maps. Through UAV aerial photography and data post-processing, the original three-dimensional model of HT is seamlessly integrated, which realizes the macro-and micro-integration of mines and solves the huge workload of traditional artificial real-life modeling.

High-precision real-time monitoring of environmental conditions, excavation progress, equipment operation, working conditions and other information, giving data space attributes and visualizing complex factors. Form a set of insightful reference data to provide powerful decision support for mine operation supervision.

Planning programming

Combine GIS data with cloud computing, big data, Internet of Things and other technologies to build a real digital economy, digital city and digital China; Based on time and space, through visual analysis technology, it provides technical support for urban planning, layout, analysis and decision-making, and promotes urban digital transformation and construction.

Data visualization has also changed the previous working mode to some extent, such as city patrol. Staff do not need to go to the scene, and they can view it directly on the visualization platform through roaming and video surveillance. Combined with the Internet of Things, they can even control the monitoring of urban indicators when they are abnormal or give an alarm.

Integration with GIS in land location, path planning, resource allocation and environmental monitoring. To assist decision analysis from a macro perspective and monitor assets from a micro perspective, so that every industry can embark on more intelligent production, management and operation and maintenance.