Research Article
Ground Risk Assessment of UAV Operations Based on Horizontal Distance Estimation under Uncertain Conditions
Table 2
Percentage of different types of areas and central angles
| Zone no. | Buildings | Trees (%) | Sparse tree (%) | No obstacles (%) | Central angle (°) |
| Zone 1 | 17.32% | 21.37 | 23.74 | 37.57 | 78.0 | Zone 2 | 0 | 58.32 | 32.39 | 9.29 | 26.2 | Zone 3 | 27.27% | 49.69 | 5.81 | 17.23 | 88.7 | Zone 4 | 0 | 41.95 | 21.10 | 36.95 | 23.6 | Zone 5 | 11.14% | 46.45 | 6.68 | 35.73 | 87.0 | Zone 6 | 0 | 7.69 | 62.03 | 30.28 | 56.5 |
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