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Field-Scale Mapping of Surface Soil Organic Carbon Using Remotely Sensed Imagery

Dep. of Crop and Soil Sci., Univ. of Georgia, Athens, GA 30602 USA

View larger version (21K): [in a new window]   Fig. 1 Location of the study site in Georgia

View larger version (17K): [in a new window]   Fig. 4 Plots and the fitted curve between organic-C concentrations and image-intensity value for the red, green, and blue bands. [The fitted equation, with ]

View larger version (80K): [in a new window]   Fig. 2 The color slide image of the field. (The image was geo-referenced into the Universal Transverse Mercator coordinate system.)

View larger version (81K): [in a new window]   Fig. 3 The low-pass filtered result for the color slide

View larger version (67K): [in a new window]   Fig. 5 The result of Post_Result1. (This image was obtained by first examining the organic-C concentrations for each pixel and then classifying the result into eight classes. The clip and majority were applied before final display.)

View larger version (66K): [in a new window]   Fig. 6 The result of Post_Result2. (This image was obtained by first classifying the bare surface image into 20 classes, examining the organic-C concentrations with the average, upper-bound, and lower-bound values for each class, and then grouping these 20 classes into 8 classes. The clip and majority were applied before final display.)

View larger version (31K): [in a new window]   Fig. 7 Area comparison of two approach results, Post_Result1 and Post_Result2

View larger version (18K): [in a new window]   Fig. 8 The linear relationships between measured and predicted (Post_Result1) organic-C concentrations for the 31 locations

View larger version (17K): [in a new window]   Fig. 9 The linear relationships between measured and predicted (Post_Result2) organic-C concentrations for the 31 locations