Table 172

Number of Correctly and Incorrectly Classified WD, MWD, and SWpD/pD drainage Classes and the total percent of Correctly Identified Classes from discriminant Analysis, Indicator Kriging, and Indicator Cokriging; values in parentheses Are percentages of Correctly Estimated Sites for Each Drainage Class

Classified as true drain -

Class WD MWD SWpD/pD total % Correct

Discriminant analysis with topographical variables (significant from stepwise procedure are slope and distance to drain)

Discriminant analysis with topographical and EC variables (significant from stepwise procedure are EC deep and distance to drain)

Indicator kriging

Indicator cokriging with slope and distance to drain

Indicator cokriging with EC deep and distance to drain

FIGURE 17.2 Drainage maps obtained from (a) discriminant analysis with deep electrical conductivity (EC) and distance to drainageway, (b) indicator kriging based on the measured drainage classes , and (c) indicator cokriging based on the measured drainage classes with slope and distance to drainageway as secondary variable.

FIGURE 17.2 Drainage maps obtained from (a) discriminant analysis with deep electrical conductivity (EC) and distance to drainageway, (b) indicator kriging based on the measured drainage classes , and (c) indicator cokriging based on the measured drainage classes with slope and distance to drainageway as secondary variable.

discriminant analysis is not. That is, the maps created based on the discriminant analysis ignore the actual data in sampled locations. Hence, indicator kriging and cokriging are preferable compared with discriminant analysis for mapping purposes. Drainage maps obtained from (1) discriminant analysis with deep EC and distance to drainageway, (2) indicator kriging, and (3) indicator cokriging with slope and distance to drainageway are shown in Figure 17.2a through Figure 17.2c, respectively.

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