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Table 3 Classification accuracy: damage level and ∆γ (HH, HV) threshold level

From: Detection of damaged urban areas using interferometric SAR coherence change with PALSAR-2

Damage level γ (HH, HV) threshold   Khokana Sankhu
Prod. acc. User acc. Ave. Overall acc. Prod. acc. User acc. Ave. Overall acc.
Case (1) damage level ≥0 (all buildings) 0.1 D 60.6 25.1 42.9 96.7 32.2 37.7 34.9 93.3
DF 97.3 99.4 98.3 96.9 96.0 96.5
0.2 D 38.7 34.9 36.8 98.0 26.1 43.0 34.5 94.0
DF 98.9 99.1 99.0 98.0 95.8 96.9
0.3 D 18.0 52.0 35.0 98.5 16.6 52.2 34.4 94.5
DF 99.8 98.8 99.3 99.1 95.3 97.2
0.4 D 6.5 56.0 31.2 98.5 6.2 50.6 28.4 94.4
DF 99.9 98.6 99.3 99.6 94.8 97.2
Case (2) damage level ≥4 (heavy structural damage) 0.1 D 71.2 13.0 42.1 96.7 37.0 18.6 27.8 94.6
DF 96.8 99.8 98.3 96.1 98.4 97.2
0.2 D 50.3 20.0 35.1 98.3 31.7 22.4 27.1 95.8
DF 98.7 99.7 99.2 97.3 98.3 97.8
0.3 D 26.7 34.0 30.4 99.2 21.5 29.0 25.2 96.9
DF 99.7 99.5 99.6 98.7 98.1 98.4
0.4 D 11.5 44.0 27.8 99.3 6.9 24.1 15.5 97.3
DF 99.9 99.4 99.7 99.5 97.8 98.6
Case (3) damage level = 5 (total collapse) 0.1 D 66.7 1.5 34.1 96.4 40.8 8.1 24.5 95.1
DF 96.5 100.0 98.2 95.6 99.4 97.5
0.2 D 45.8 2.3 24.1 98.3 35.0 9.8 22.4 96.3
DF 98.4 100.0 99.2 96.9 99.4 98.1
0.3 D 20.8 3.3 12.1 99.4 21.7 11.6 16.6 97.7
DF 99.5 99.9 99.7 98.4 99.3 98.8
0.4 D 16.7 8.0 12.3 99.8 4.2 5.8 5.0 98.4
DF 99.8 99.9 99.9 99.4 99.1 99.2
  1. D damage, DF damage-free