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A Computer Program for Soil Textural Classification

^a Dep. of Crop and Soil Sciences, Plant and Soil Sciences Building, Michigan State Univ., East Lansing, MI 48824-1325 USA

View larger version (31K): [in a new window]   Fig. 1 The USDA textural triangle. The vector V extending from point A parallel to the positive y-axis crosses one edge of the "sandy loam" polygon; therefore, point A is inside the polygon. Points B and C are borderline cases explained in the text

View larger version (12K): [in a new window]   Fig. 2 Illustration of how the algorithm determines whether point T is inside polygon ABCD