Table 5. Statistical table of samples using different sensors.
| Sensor | Number of samples | Sample proportion | I 2 |
| UAV lidar | 82 | 35.19% | 97.3 |
| Ground lidar | 52 | 22.32% | 75 |
| RGB | 40 | 17.17% | 93.5 |
| Spectra | 18 | 7.73% | 99.7 |
| Multi-source | 41 | 17.60% | 95.5 |
| Total | 233 | 100% |
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