Traditional remote sensing imagery, due to the use of center projection to obtain ground image, imaging is affected by the sensor's internal state changes, external state and surface state, resulting in different degrees of distortion and distortion, specifically manifested in the image center point pixels around the buildings showing a tilt pattern, resulting in the occlusion between buildings.
In order to eliminate the occlusion phenomenon caused by the tilt of the object, so that the objects on the image are evenly distributed in the real position, it is necessary to correct the orthophoto image TOM to form a true radiograph TDOM.
True radiographs have higher credibility and height than orthophoto images, as well as richer amounts of information, which can be directly used for image interpretation, measurement and thematic mapping, serving resource and environmental survey research, and can also be used for urban planning, traffic management, digital public security, fire rescue, land resources, geological exploration, etc. after three-dimensional real-life modeling.
After correcting the orthophoto image, only need to use the reality modeling software ContentCapture for 3D modeling, the specific modeling process, you can see the following software introduction and tutorial.
ContextCapture is software that automatically generates detailed 3D reality models from simple photos and/or point clouds.
Digital cameras, smartphones, laser scanners, cameras and other instruments can be used as input data for ContextCapture.
ContextCapture's high compatibility enables precise and seamless reconstruction of a variety of data sources for a variety of objects, from centimeters to kilometers, shooting from the ground or from the air. As long as the resolution and accuracy of the input photos are sufficient, the resulting 3D model can achieve infinite fine detail.
For the specific process of generating a 3D reality model from orthophoto image, please pay attention to the "Ai 3D Technology" WeChat public account, reply to "Classroom", and check out the ContentCapture software tutorial teaching.
Let's take a look at the specific features of ContextCapture:
1. Integrate geo-referenced data
ContextCapture provides local support for many types of location data, including GPS markers and control points. It can also import any other positioning data via position/rotation import or full block import, enabling accurate measurement of coordinates, distances, areas, and volumes.
2. Automatic aerial triangulation and 3D reconstruction
Once the relative position and orientation of each photo is automatically recognized, aerial triangulations can be fine-tuned by adding control points and editing connection points to maximize geometric and geospatial accuracy. Optimized 3D reconstruction algorithms produce accurate 3D models and image textures for each grid patch with unmatched accuracy. ContextCapture ensures that the vertices of each 3D grid model are optimally placed, so finer details and sharper edges can be reproduced with fewer artifacts, greatly improving geometric accuracy.
3. Generate 2D and 3D GIS models
With ContextCapture, you can generate accurate georeferenced 3D models in a variety of GIS formats, including real projective images and new Cesium 3D Tiles, and export tile extents and null three results to KML and XML. ContextCapture provides a coordinate system database interface that ensures data interoperability with GIS solutions. You can choose from more than 4,000 spatial reference systems and add user-defined coordinate systems. Also, ContextCapture automatically adjusts the resolution and precision of the model based on the resolution and spatial distribution of the input photos.
This means that ContextCapture can handle scenes with uneven resolution without sacrificing overall efficiency to preserve some higher resolution areas of the scene.
4. Process the reality model
ContextCapture can quickly and easily handle grid models of any scale, as well as cross-section generation, terrain and breakline extraction, and orthophoto, 3D PDF, and iModel generation. It integrates a grid model with GIS and engineering data to enable visual search, navigation, visualization, and animation of that information in the visual environment of the grid model.
5. Process point clouds
Point clouds can be enhanced, segmented, classified, and combined with engineering models. Then, leverage ContextCapture's advanced 3D modeling, cross-section cutting, breakline, and terrain extraction capabilities to quickly and efficiently model as-built conditions and support the design process. As a result, ContextCapture can better evaluate point clouds and generate more accurate engineering models. You can also generate animations and renderings for presentation.
6. Generate and process large scalable terrain models
ContextCapture can generate very large scalable terrain models from a variety of sources, including point clouds, breaklines, raster digital elevation models, and existing triangularized irregular networks. By synchronizing with the original data source, scalable terrain models can be updated to the latest in real time. The value of this is to have a global, up-to-date, and comprehensive representation of all your data, and to perform analysis using a variety of display modes, as well as to generate animations and visualizations.
7. Generate a 3D CAD model
Generate 3D models based on a variety of CAD formats, 3D common formats, DSMs, and dense 3D point clouds to ensure that the models are accessible in the modeling environment. In addition, multi-resolution grid models composed of billions of triangular patches can be generated, and the Bentley family of platform software natively supports grid model data. These include MicroStation, Descartes, AECOsim Building Designer, OpenRoads, OpenPlant, Bentley Map®, Bentley Substation, and more.
Use reality models for road design in Bentley's OpenRoads ConceptStation
8. Publish and view web-enabled models
With ContextCapture, users can generate realistic models of any size optimized for web publishing and view them in a browser. Such as ContextCapture's native format 3MX, or Cesium 3D Tiles. This way, you can share the 3D model with any stakeholder at any time and present it visually.
Publish the web of 3D models
Published to S3C Online
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