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Creation and Interpolation of Continuous Soil Layer Classes in the Lower Namoi Valley

^a Australian Cotton Cooperative Research Centre, Dep. of Agricultural Chemistry and Soil Science, Ross Street Building A03, The Univ. of Sydney, NSW Australia 2006
^b Faculty of Environmental Sciences, Griffith Univ., Nathan, Qld 4111, Australia

View larger version (48K): [in a new window]   Fig. 1. Location of the Edgeroi 1:50000 topographic map sheet with primary grid and site identification number

View larger version (61K): [in a new window]   Fig. 2. The geological and geomorphic components of the Edgeroi area (after Ward, 1999). Note that the third and fourth terraced fans are mantled with water sorted clay loess

View larger version (17K): [in a new window]   Fig. 3. The validity functionals, fuzziness performance index (FPI) and normalized classification entropy (NCE), at various fuzziness exponents () plotted against number of soil layer classes (c)

View larger version (24K): [in a new window]   Fig. 4. Plot of -[(JE/)c0.5] vs. for 7 to 12 classes (c)

View larger version (32K): [in a new window]   Fig. 5. Biplot showing (a) distribution of 1419 soil layers and (b) rays of the 12 attributes shown as lines, on the first two principal components

View larger version (21K): [in a new window]   Fig. 6. Biplot showing the position of the 10 layer centroids and 95% density ellipses for (a) Couradda, Moema, and Wewak, (b) Mayfield, Bald Knob, and Togo, and (c) Noelurma, Moplain, Nundi, and Boolcarrol classes along the first two principal components

View larger version (132K): [in a new window]   Fig. 7. Location of exemplars (square) and members of layer class: (a) Togo, (b) Boolcarrol, (c) Bald Knob, (d) Moplain, (e) Mayfield, (f) Nundi, (g) Wewak, (h) Noelurma, (i) Moema, (j) Couradda, (k) Extragrade, and (l) Intragrade soil layers, as shown in relation to Edgeroi geology and geomorphology. Note that exemplars µi = 1

View larger version (60K): [in a new window]   Fig. 8. Composite map showing layer class mapping units at depths of (a) 0 to 0.10, (b) 0.10 to 0.20, (c) 0.30 to 0.40, (d) 0.70 to 0.80, (e) 1.20 to 1.30, and (f) 2.50 to 2.60 m

View larger version (47K): [in a new window]   Fig. 9. Maps of confusion index (CI) at depths of (a) 0 to 0.10, (b) 0.10 to 0.20, (c) 0.30 to 0.40, (d) 0.70 to 0.80, (e) 1.20 to 1.30, and (f) 2.50 to 2.60 m