Table 2. Parameters of the Pix4D processing used in this study.
| Step | Items | Values |
|---|---|---|
| Initial Processing | Keypoits Image Scale | Full |
| Matching Image Pairs | Aerial Grid of Corridor | |
| Targeted Number of Keypoits | Automatic | |
| Point Cloud and Mesh | Point Cloud Image Scale | 1 |
| Point Cloud Point Density | High | |
| Point Cloud Minimum Number of Matches | 2 | |
| 3D Textured Mesh Settings | High Resolution | |
| Matching Window Size | 7×7 pixels | |
| DSM, Orthomosaic and index | DSM and Orthomosaic Resolution | Automatic |
| DSM Filters | Use Noise Filtering Use Surface Smooting (Sharp) |