Research Article
Construction of a Visual Saliency Model for Neighborhood Building Landmarks Based on K-Means Clustering
Table 1
Meanings of hazard classes.
| Risk level | Risk | Meaning |
| PR1 level | Low risk | Safety | PR2 level | Medium risk | Existing security | PR3 level | Medium-to-high risk | Typical potential hazard | PR4 level | High risk | Danger |
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