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Image ground sampling distance (GSD) information.
| Scanner Type | Crack | Target Diameter (cm) | Target Radius (pixel) | GSD (cm/pixel) |
|---|---|---|---|---|
| Handheld laser | 1 | 0.6 | 59.13 | 0.0051 |
| 2 | 0.6 | 48.27 | 0.0062 | |
| 3 | 0.6 | 46.94 | 0.0064 | |
| Terrestrial laser | 4 | 5 | 59.25 | 0.0422 |
| 5 | 5 | 63.61 | 0.0393 | |
| 6 | 5 | 69.71 | 0.0359 |
