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1 year ago

postdisaster

Stone-D-Ayala-final-report

Comparison of

Comparison of proportions of building types - Manta Comparison of proportions of building types - All 100% 80% 80% 60% 40% 60% 40% 20% 20% 0% RC Timber Other Unknown 0% RC Timber Other Unknown Ground Virtual Ground Virtual (c) Figure 8 - Comparisons of proportions of building types identified for (a) Pedernales, (b) Portoviejo, (c) Manta, and (d) Overall (d) Figure 9 - Hidden timber structure, Manta, Ecuador © EEFIT The number of storeys is another surveyed parameter that has been compared between ground and virtual surveys; the results are given in Figure 10. Generally, the results compare well, however, there are clear issues with unknown heights of demolished buildings in the virtual survey, which were understood by the ground surveyors, especially in Manta where most demolished buildings could be viewed prior to the earthquake in Google Street View, (and this was used in the ground survey results only). In addition, the virtual surveyor reported that they had ignored any additional light metal roof structure constructed on top of an RC frame, e.g. see Figure 11, unless masonry walls had been raised up to the new roof level, whereas in the ground survey all storeys,

egardless of material, were recorded. This discrepancy could be overcome with appropriate training. This building practice (as seen in Figure 11) was common on the Manta and Portoviejo survey routes. Also, the number of storeys recorded was the maximum for each individual structure, and sometimes buildings had extra floors but set back away from the road. In some circumstances the highest floor height may not be visible or clear in the nearest photos spheres, e.g. see Figure 12. Comparison of number of storeys - Pedernales Comparison of number of storeys - Portoviejo 50% 40% 40% 30% 20% 10% 30% 20% 10% 0% 1 2 3 4 5 6 7 8 9 Unk 0% 1 2 3 4 5 6 7 8 9 Unk Ground Virtual Ground Virtual (a) (b) Comparison of number of storeys - Manta Comparison of number of storeys - All 35% 30% 25% 20% 15% 10% 5% 0% 1 2 3 4 5 6 7 8 9 Unk 35% 30% 25% 20% 15% 10% 5% 0% 1 2 3 4 5 6 7 8 9 Unk Ground Virtual Ground Virtual (c) Figure 10 - Comparisons of proportions of number of storeys identified for (a) Pedernales, (b) Portoviejo, (c) Manta, and (d) Overall (d)

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