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Quantitative Mapping of Soil Drainage Classes Using Topographical Data and Soil Electrical Conductivity

Dep. of Crop Sciences, 1102 S. Goodwin Ave., Univ. of Illinois, Urbana, IL 61801

View larger version (101K): [in a new window]   Fig. 1. Locations of the core samples used to determine soil drainage classes along with the soil survey map and elevation map of the studied area. Each sampling site is labeled according to its drainage class.

View larger version (18K): [in a new window]   Fig. 2. Sample variograms and variogram models of indicator transformed data for (a) well-drained sites, (b) moderately well-drained sites, and (c) somewhat poorly and poorly drained sites.

View larger version (23K): [in a new window]   Fig. 3. Sample cross-variograms and cross-variogram models for terrain slope and indicator transformed data for (a) well-drained sites, (b) moderately well-drained sites, and (c) somewhat poorly and poorly drained sites.

View larger version (96K): [in a new window]   Fig. 4. Drainage maps obtained from (a) discriminant analysis with deep electrical conductivity 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.