Sodex Drone Mapping Best Practices

Flying Tips

Data Collection Effort – Full 3D

For best-in-class results with full 3D reconstruction, Sodex recommends:

• 60% overlap nadir flight (camera pointing straight down)
• 70–80% overlap with a 45° gimbal angle cross-grid

The 45° cross-grid ensures a fully tied-together 3D model, while the nadir flights provide the necessary texture for orthophoto generation. Although 60% overlap is the minimum requirement, higher overlap in the cross-grid significantly improves feature matching and the final reconstruction quality.

Best Practice Notes:

• Use both nadir and oblique (angled) captures to minimize occlusions.
• Maintain consistent altitude and speed to avoid gaps in coverage.
• Ensure stable camera calibration for reliable feature matching.

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Data Collection Effort – 2D and 2.5D Products

For orthophotos and digital surface models (DSM/DTM), Sodex recommends:

• 70–80% overlap using slightly off-nadir imagery (5–10° off nadir)

This configuration is well-suited for areas with simple terrain. For complex structures like buildings, forests, or uneven terrain:

• Aim for 80–83% overlap to improve accuracy.
• If terrain is relatively flat, 70% overlap may be sufficient without quality loss.

Best Practice Notes:

• Off-nadir imagery reduces systematic errors and improves tie point distribution.
• Balance overlap and flight time—higher overlap means longer flights but better accuracy.
• Use consistent lighting (avoid strong shadows or dusk conditions).

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Key Takeaways

1. Higher overlap = higher accuracy, especially in complex environments.
2. Mix nadir and oblique shots for best 3D reconstructions.
3. Plan flights carefully to account for terrain, lighting, and UAV limitations.
4. Always validate your data before processing to avoid reconstruction errors.