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Official Journal of the Asia Oceania Geosciences Society (AOGS)

Table 1 Summary of workplan information cited in Fig. 4 as applied to the different disaster events and their corresponding products

From: Imaging ground surface deformations in post-disaster settings via small UAVs

Event Lag days* Pre-deployment On-site considerations Flight parameters Products
Remotely-sensed data Terrain and hazard maps Local reports Shapefiles Accessibility and situational safety Target features Size of affected site (km2) Size of deformed surface features Dim. of flight plan (m2) Elev. (m) Overlap size (%) Orien-tation Flight time (min) Reso-lution (cm) Types
2019 Central Luzon earth-quake 1 IfSAR DTM Escorted by local officials Earthquake epicenter Highly accessible and safe Lateral spreading (Fig. 6) 3.6 Length: 40 m 8000 50 80 NE 5 1.17 Orthomosaic
Point cloud
   Affected residents     Vertical offset: 60 cm       
      Road collapse (Fig. 7) 0.1 Length: 150 m 40,000 50 80 N 25 1.18
       Vertical collapse: 4 m       
2019 Cotabato earth-quakes 7 Initially-processed InSAR products IfSAR DTM Escorted by local officials Interpreted line from InSAR products Damaged roads Landslide (Fig. 8) 0.5 Area: 6000 m2 300,000 100 70 NE 18 4.78 Orthomosaic
Raster images Landslide hazard maps Affected residents Earthquake epicenters Militant threat Riedel shears (Fig. 9) 0.002 Lengths: 1–2 m N/A (manual flight) 4 10–30 NE 10 0.11
     Landslide threat   Area: 900 m2      
2020 Taal eruption 12 LiDAR DTM NDRRMC reports Points from reports of reported fissures Within 14 km danger zone Fissures (Fig. 10) 1.8 Lengths: 1–19 m 135,000 100 60 NW 18 3.38 Orthomosaic
  Volcanic hazards maps PHIVOLCS reports   Damaged roads         
   Social media posts   Danger of eruption         
  1. *The number of days after the event that the survey team was deployed and data was acquired