1. What is the role of the 3D model?
The 3D model is the digital spatial representation of the bridge, with two roles: defect positioning — defects in captured photos need to know where they are on the bridge, and the 3D model provides a unified spatial reference so defects can be mapped onto the model at pixel level; refined routes — manually piloted drones have blind spots and difficulty scanning completely without misses, while model-based automatic generation produces refined routes covering different inspection areas.
2. How is it reused long term after modeling?
Modeling and routes are one-time baseline work; once completed, subsequent inspections directly reuse the existing model and routes without rebuilding. This enables multi-period inspection data to be compared on the same model to observe defect progression.
3. Applicable modeling scenarios
| Scenario | Description |
|---|---|
| First inspection | Requires modeling and route planning |
| Multi-period inspection | Reuse model and routes, compare defect changes |
| Multiple model types | Oblique photography / LiDAR / BIM can all be imported |
4. Applicable conditions and scenarios
- First operation requires modeling and route planning
- Oblique photography, LiDAR and BIM models can all be imported
- Suitable for bridges with routine, multi-period inspection needs
5. Notes
Model quality directly affects defect positioning accuracy and route coverage; it is recommended that a professional team complete modeling per inspection standards.