Salami, Ayobami T. 
  
  
  
  
  
The individual is assigned to the class for which the probability value is greatest. In an operational context, 
the observed means, variances and covariances are substituted using the log form of equation (1): 
Ln[Q(X;)] - -1/21n(D)-U2(X;-M) Dy (X;-My) ............... eq.(2) 
Where: 
M, = Mean vector associated with a sample of observations belonging to the kth class; taken as an 
estimator of U,. 
Dx = p by p dispersion matrix associated with a sample of observations belonging to the kth class; taken as 
an estimator of 7. 
A simple decision rule, R;, can be derived from the equation (2) by estimating constants: 
R;: Choose K which minimises. 
FLK(X)- Lo(DO (Xx -M m OM... eennereretnenece eq.(3) 
4 RESULTS AND DISCUSSION 
The results of the analysis are presented in three parts. These are the levels of divergence among the 
classes, the confusion matrix and output of the final supervised classification. 
4.1 Level of Divergence 
The divergence matrix (Table 1) shows the extent of separation among the vegetal classes mapped from the 
imagery. Table 2 which expresses the level of separability in percentages, was derived from Table 1. The 
former shows that tree crop/mature secondary regrowth and young secondary regrowth (CS and C6) are the 
most similar classes. There is only 27.93% separation between the two classes. This result depicts the 
extent of similarity between the two vegetal types. The reason for this is explained later in the discussion. 
Apart from this high level of similarity between C5 and C6, there is generally, a high level of 
discrimination among the classes. This shows that generally, the variances between are much higher than 
variances within the classes or vegetal types. 
Table 1: Divergence Matrix of Cover Types 
Cl c C3 C4 C5 C6 
Ci 0.0000 
C2 0.9988 0.0000 
C3 0.9987 0.8381 0.0000 
C4 0.8979 0.8315 0.8469 0.0000 
Cs 1.0000 1.0000 0.9999 0.9958 0.0000 
C6 1.0000 0.9996 0.9975 0.9679 0.2793 0.0000 
KEY 
C1: Burnt Patches (BP) 
C2: Arable Cropland/Fallow Complex (ACFC) 
C3: Exposed Land/Settlement (ELS) 
C4: Mixed Grassland (MG) 
C5: Tree Cropland/Mature Secondary Regrowth Complex (TMSRC) 
C6: Young Secondary Regrowth (YSR) 
  
International Archives of Photogrammetry and Remote Sensing. Vol. XXXIII, Part B7. Amsterdam 2000. 1303