1. Introduction to tilt photography components
Oblique photography is a high-tech technology in the field of GIS surveying and mapping, which has achieved significant development in recent years. This technology uses drones and other vehicles equipped with multiple sensors to collect image data from different angles. It can break through the limitation of traditional orthophotos that only have vertical angles, thereby achieving more accurate and rich geographical information acquisition and three-dimensional scene reconstruction . .
Oblique photography technology mainly has the following characteristics:
**1. Multi-angle data collection:** Oblique photography can collect image data from a vertical angle and multiple oblique angles. These multi-angle data can provide a more comprehensive and multi-angle perspective, which helps to capture the details of the target area and complexity.
**2. 3D scene reconstruction and modeling: ** Oblique photography technology can use the collected image data for 3D scene reconstruction and modeling, and generate L2-precision 3D models of terrain, buildings, etc., which is a digital twin city-related technology Provide strong support.
**3. Real image texture: **By mapping real images onto the 3D model, a more realistic simulation effect can be achieved, making the generated 3D model closer to the real world, which is helpful for visualization and decision support.
**4. Large-scale area coverage: **Oblique photography technology can realize rapid acquisition and processing of large-scale areas, so as to complete large-scale geographic information collection and 3D modeling in a short time.
Currently, more and more digital twin projects use oblique photography models as digital twin baseboards. When oblique photography is combined with digital twin technology, powerful visualization and twinning applications can be created in multiple fields,** to better understand and analyze real-world scenarios, conduct simulation testing and decision support, and provide research, planning, and research in various fields. and design to provide more accurate and comprehensive data support. **Because of its advantages, when using the EasyV low-code digital twin visualization platform, many users often have the need to use related oblique photography functions, so as to improve the efficiency of high-precision modeling.
The "Tilt Photography" component has been officially launched on the EasyV Premium Edition on August 16 (Wednesday) . Through this component, users can achieve:
1. Oblique photography data loading: EasyV oblique photography component can easily load oblique photography data, including high-precision images with large oblique angles, and capture 3D information of objects such as landforms and buildings. Users can import real-world geographic data into the platform to lay the foundation for large-scale modeling.
2. Diversified visual display: Through this component, users can display oblique photography data in various visual forms such as scattered points, flying lines, paths, and regions. This diverse display method helps to better present geographic information analysis results, allowing users to intuitively understand and explore the data in the model.
3. 3D and 2D linkage interaction: EasyV tilt photography component can not only realize high-precision 3D modeling, but also can be linked with conventional 2D components to realize the interaction between 3D scenes and 2D billboards. This interactive performance enables users to explore data more deeply, while combining 3D information with other business data to provide more comprehensive support for decision-making.
2. Application process of tilt photography component based on EasyV
Step1. Oblique photography data processing and loading
1. OSGB to 3DTiles
OSGB : It is an international common 3D scene format, and most oblique photography data are in this format.
3DTiles : It is the only oblique photography data format currently supported by the EasyV oblique photography component. If there is oblique photography data in other formats (such as OSGB, OBJ, etc.), it needs to be converted into 3D Tiles format before use.
Enter the cesiumlab software to convert the oblique photography data in OSBG format to the 3DTiles format supported by the EasyV oblique photography component.
For specific conversion steps, please refer to the official website of EasyV: Oblique Photography Data Processing Guide - EasyV Official Product Documentation
2. Get the URL of the tileset.json file and load the oblique photography data in the component.
After publishing the oblique photography data of 3DTiles as a resource service, take the url of the top-level JSON file and fill it here to load the oblique photography data into the component.
3. Modify the basic settings of the components to ensure correct loading of oblique photography data
In the basic settings of the oblique photography component, by adjusting the two configuration items of the altitude and the maximum number of tiles, the oblique photography data can be fully loaded in the component.
Altitude
Oblique photography data uses the Earth coordinate system and has altitude values. Usually sub-components only have two-dimensional data points of longitude and latitude, but lack altitude. Therefore, when the longitude and latitude points of the sub-component are mapped to the scene, a virtual altitude value is needed to complete the conversion of the earth coordinate system to visually Achieve surface alignment for oblique photography.
地球坐标系
When actually adjusting this configuration item, you can check relevant information to know the approximate altitude of the current oblique photography area in reality, or you can adjust different values to visually make the sub-assembly basically flush with the ground .
Maximum number of tiles
The value of this configuration item limits the maximum number of tiles that can be loaded in the scene. If this value is exceeded, new tiles will not be loaded. If you cannot see any tiles initially or there are missing tiles, it may be that the number of tiles is greater than the value of this configuration item. You need to gradually try to increase this configuration item. Once a reasonable value is reached, the oblique photography model can be fully displayed.
如图为瓦片显示不全情况，需要逐步加大最大瓦片数配置项数值
Step 2. Adjust the scene effects to optimize the oblique photography data loading effect. 1.
Adjust the general settings of the 3D scene
. You can adjust the scene range rendered in the picture through the camera and lens range adjustment functions. At the same time, you can also limit the movable range of the lens.
In debug mode, you can view performance parameters and troubleshoot problems. At the same time, in order to alleviate the performance burden, corresponding adjustments can also be made by appropriately reducing the device pixel ratio.
调试模式：便于开发者调试的渲染状态信息
2. Scene rendering effect adjustment
In the scene effect configuration, HDRI can provide a sky as a background for the scene, and HDRI also provides indirect lighting for physically rendered objects in the scene . At the same time, users are allowed to select tone mapping to adjust the overall scene effect. At the same time, you can adjust the overall color of the picture through the color adjustment parameters. You can appropriately increase the saturation, contrast and correct the exposure of the picture to beautify the picture effect. And, through parameter settings such as floodlight, fog, and anti-aliasing, we can jointly adjust and optimize the rendering effect of the scene.
Step3. Configure sub-components and other interactive effects to improve scene business functions. The
oblique photography component provides multi-functional and diverse sub-component styles. Combined with GIS, it can display business in the form of scattered points, flying lines, paths and areas, etc., and can Linked with conventional 2D components to realize interaction between 3D scenes and 2D signage.
At present, the tilt photography component has been officially launched in the EasyV exclusive version. Click "Read the original text" below to start a product trial. The platform has built 13 kinds of map components, covering two-dimensional to three-dimensional multi-type maps, with rich map types, business sub-components, interactive operations and personalized adjustments. In the future, EasyV will continue to optimize and improve GIS capabilities, so that every An organization and an individual both see and benefit from digitalization!
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