1. What determines the shooting distance?
Image resolution is jointly determined by camera pixels, lens focal length and shooting distance: the higher the pixels and the longer the focal length, the finer the detail that can be reproduced at the same distance. RIEJIAN’s 100MP telephoto camera uses dual mechanical + software stabilization to offset drone vibration in the air, ensuring clear imaging at long distances. The shooting distance is not a fixed value; it is set in the route-planning software based on bridge structure, defect accuracy requirements and safety regulations.
2. How is accuracy balanced with efficiency?
Operations must balance accuracy and efficiency: each time resolution doubles, operational efficiency drops by roughly four times. Routine inspections therefore fly at the designed distance to guarantee efficiency, while higher-accuracy verification (e.g. 0.05mm-level checks) shortens the distance for targeted re-capture, balancing inspection quality and operational cost.
3. Shooting distance in different scenarios
| Scenario | Distance strategy | Description |
|---|---|---|
| Routine full-bridge inspection | Automatic capture at designed distance | Set by route planning to ensure efficiency |
| Fine crack verification | Shorten distance, targeted re-capture | 0.05mm measured at 3m |
| Restricted-area operations | Follow access requirements | Railway, navigable areas require permits |
4. Applicable conditions and scenarios
- Routine bridge inspection: fly along preset routes; shooting distance automatically set by the route-planning software
- High-precision verification: shorten distance for targeted re-capture of suspected fine cracks
- Special areas: when involving restricted areas such as railways or navigable waters, follow the access requirements of the competent authority
5. Notes
Although a closer shooting distance improves resolution, it reduces operational efficiency by multiples and increases safety risk; actual parameters must be determined by combining bridge scale, accuracy requirements and operational standards.