1. Characteristics of the three modeling methods
- Oblique Photography: reconstructs a high-accuracy real-scene 3D model from multi-angle imagery; the primary modeling method for current bridge inspection.
- LiDAR: builds models from point cloud data; suited to scenarios with high geometric accuracy requirements.
- BIM (Building Information Modeling): builds models from design and management information; convenient for connecting with member coding and maintenance management.
2. How to choose among the three?
| Modeling method | Advantage | Applicable scenario |
|---|---|---|
| Oblique photography | High real-scene fidelity | Routine bridge inspection modeling |
| LiDAR | High geometric accuracy | High-precision measurement needs |
| BIM | Carries member information | Design-maintenance integration |
The three methods can be flexibly selected based on bridge characteristics and the customer’s existing data. Once built, the model is used for defect mapping, refined route generation and long-term reuse.
3. Applicable conditions and scenarios
- New inspection projects choose the modeling method by site conditions
- Projects with existing BIM data can import and reuse directly
- Models support different levels of detail, including the full bridge and girder soffit
4. Notes
Different modeling methods differ in accuracy, cost and cycle; selection should consider bridge structure and purpose. Full-element modeling including the girder soffit requires higher investment.