Author Affiliations
School of Geographic and Biologics, Nanjing University of Posts and Telecommunications, Nanjing 210023, Jiangsu , Chinashow less
Fig. 1. Deformation monitoring type. (a) Traditional discrete point deformation monitoring; (b) deformation heterogeneous monitoring using point cloud
Fig. 2. Corresponding blocks. (a) Block in Ⅰ epoch; (b) block in Ⅱ epoch
Fig. 3. Deformation object with u sub-regions
Fig. 4. R-tree structure and spatial index
Fig. 5. Vertical deformation of blocks. (a) Baseline near-quasi-attitude; (b) block deformation estimation
Fig. 6. Angle representation for blocks
Fig. 7. Deformation merge process with label. (a) Block deformation degree; (b) merger deformation; (c) deformation graph generation
Fig. 8. Simulated subsidence point clouds of epoch I and II. (a) 3D point cloud; (b) 2D projection
Fig. 9. Error estimation under different noise levels (σ) and block sizes (D)
Fig. 10. Landslide case
Fig. 11. Deformation graph of landslide. (a) Deformation graph; (b) deformation distribution
Fig. 12. Deformation distribution of different block sizes
Fig. 13. Deformation estimation by different methods. (a) Deformation graph by median method; (b) deformation distribution by median method; (c) deformation graph by maximum method; (d) deformation distribution by maximum method; (e) deformation graph by mean method; (f) deformation distribution by mean method
| Ⅰ epoch | | Ⅱ epoch | | | |
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| | | | | | | | |
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1 | 40 | -0.3901 | -0.0002 | 0.9195 | | 100 | -0.2602 | -0.0001 | 0.9599 | 7.9754 | 7.9113 | 0.0640 | 7 | 100 | -0.3892 | 0.0003 | 0.9197 | | 100 | -0.2603 | 0.0003 | 0.9599 | 7.9091 | 7.9113 | -0.0023 | 39 | 100 | -0.3895 | 0.0001 | 0.9198 | | 30 | 0.2604 | 0.0001 | -0.9593 | 7.9740 | 7.9113 | 0.0626 | 914 | 5 | 0.00001 | -0.9000 | 0.00002 | | 9 | 0.00001 | -0.9000 | 0.00002 | 0.00001 | 7.9113 | reject | 1751 | 80 | 0.3892 | 0.0002 | -0.9200 | | 100 | -0.2606 | -0.0001 | 0.9592 | 7.9055 | 7.9113 | -0.0059 | 11259 | 20 | -0.3896 | 0.0006 | 0.9192 | | 70 | 0.5061 | -0.0002 | -0.8599 | 6.9712 | 7.0889 | -0.1174 | 12896 | 6 | 0.0000 | -1.000 | 0.0000 | | 9 | 0.0000 | -1.0000 | 0.0000 | 0.0000 | 7.0889 | reject | 114594 | 100 | -0.3895 | -0.0006 | 0.9193 | | 20 | -0.5062 | -0.0007 | 0.8591 | 7.0528 | 7.0889 | -0.0358 |
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Table 1. Results of meta-deformation estimation for some blocks