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Table 9 Image classification accuracy by group in four classes, where A = Asymptomatic trees, B = trees defoliated less than 50%, C = trees defoliated more than 50% and D = dead trees, PA = producer’s accuracy, UA = user’s accuracy, value shown in bold = overall accuracy. Classification and reference (field check) frequencies are arranged in rows and columns respectively

From: Assessing a novel modelling approach with high resolution UAV imagery for monitoring health status in priority riparian forests

   Predicted   
Health status A B C D PA
Observed A 24 5 1 0 30 0.8
B 2 6 4 0 12 0.5
C 3 0 8 3 14 0.57
D 0 0 2 23 25 0.92
29 11 15 26 61  
  UA 0.823 0.54 0.53 0.88   0.75
  1. Kappa index = 0.65