Table 2 shows that the status of the collapsed buildings can be determined employing the proposed method as discussed in Section 3.3.2. For example, in the case of Building No. 1, the heights of the four corner points as calculated from the post-seismic stereo pairs are lower than those of the corresponding points as calculated from the pre-seismic stereo pairs, and the values of the height reduction are almost the same for the four corner points. Meanwhile, the number of collapsed storeys is calculated to be five or
six. Therefore, it is considered that this building totally collapsed in the earthquake. However, in the case of Building No. 2, the heights of the first two corner points calculated from the preand post-seismic stereo images are almost the same, and the number of collapsed storeys calculated from the first two corner points is close to zero, while the heights of the other two corner points as calculated from the post-seismic stereo pairs are lower than those calculated from the pre-seismic stereo pairs, and it is estimated that about five storeys collapsed. Therefore, the building is determined to be partially collapsed. Furthermore, in the case of Building No. 3, the heights of the four corner points are almost the same before and after the earthquake. Therefore, it is judged that the building has not collapsed during the earthquake. Similar conclusions can be made on the status of the rest buildings during the earthquake. Comparing to the ground truth, we can see that the status of a total of eight buildings (i.e., totally collapsed, partially
collapsed and not collapsed) are correctly detected by our proposed method.
Table 2 shows that the status of the collapsed buildings can be determined employing the proposed method as discussed in Section 3.3.2. For example, in the case of Building No. 1, the heights of the four corner points as calculated from the post-seismic stereo pairs are lower than those of the corresponding points as calculated from the pre-seismic stereo pairs, and the values of the height reduction are almost the same for the four corner points. Meanwhile, the number of collapsed storeys is calculated to be five orsix. Therefore, it is considered that this building totally collapsed in the earthquake. However, in the case of Building No. 2, the heights of the first two corner points calculated from the preand post-seismic stereo images are almost the same, and the number of collapsed storeys calculated from the first two corner points is close to zero, while the heights of the other two corner points as calculated from the post-seismic stereo pairs are lower than those calculated from the pre-seismic stereo pairs, and it is estimated that about five storeys collapsed. Therefore, the building is determined to be partially collapsed. Furthermore, in the case of Building No. 3, the heights of the four corner points are almost the same before and after the earthquake. Therefore, it is judged that the building has not collapsed during the earthquake. Similar conclusions can be made on the status of the rest buildings during the earthquake. Comparing to the ground truth, we can see that the status of a total of eight buildings (i.e., totally collapsed, partiallycollapsed and not collapsed) are correctly detected by our proposed method.
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