TH scores update: TSUNAMI

Hazard Processing Method

• Data Source: 3 return periods (RP100, RP500, RP2500) - inundation depth rasters
• Unit: m (meters)
• Default RP-Specific Thresholds:
  • RP100: 2.0 m
  • RP500: 1.0 m
  • RP2500: 0.5 m
• Default Area Threshold: 0%

Workflow: Different from Earthquake/Cyclone - uses MAJORITY values

1. Extract all pixel values for each RP raster within each admin unit
2. For each RP, calculate:
   • MAJORITY inundation depth = most common positive value (ignoring zero/nodata)
   • Area percentage = % of pixels above RP-specific threshold > using 0% due to sparse data format
3. Check if unit has ANY inundation data (majority > 0 in any RP)
4. Check if majority value meets RP-specific threshold AND area threshold % is met for each RP
5. Score = count of RPs meeting both thresholds (0-3)

Scoring Logic (different from earthquake/cyclone):

• No inundation data in any RP → Score -1 (not affected)
• Has inundation but 0 RPs meet thresholds → Score 0 (below threshold)
• 1 RP meets thresholds → Score 1
• 2 RPs meet thresholds → Score 2
• 3 RPs meet thresholds → Score 3

Comparison

New score distribution: ADM2

New score distribution: URBAN