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Research ArticleResearch

Spatial Prediction and Uncertainty Analysis of Topographic Factors for the Revised Universal Soil Loss Equation (RUSLE)

G. Wang, G. Gertner, P. Parysow and A. B. Anderson
Journal of Soil and Water Conservation July 2000, 55 (3) 374-384;
G. Wang
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G. Gertner
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P. Parysow
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A. B. Anderson
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ABSTRACT:

Spatial prediction and uncertainty assessment of ecological modeling and simulation systems are a difficult task because of system complexities that include multi components, their interaction and variability over space and time. Developing a general methodology and framework of uncertainty assessment for the systems' users has become very important. As the first part of a large study addressing these issues, the focus of this paper is on spatial prediction and uncertainty assessment of topographic factors involved in the Revised Universal Soil Loss Equation (RUSLE). The spatial variability of these topographic factors including slope steepness factor S, slope length factor L, and their combined LS factor were modeled with semivariogram models. Three geostatistical methods, including ordinary kriging, indicator kriging, and sequential indicator simulation, were applied and compared. The predicted value maps of these factors, their error variance or conditional variance maps, and probability maps for the predicted values larger than a given threshold value were derived. The comparison of the geostatistical methods suggests that sequential indicator simulation better than ordinary and indicator kriging.

Footnotes

  • Guanning Wang and George Gertner are scientists with the University of Illinois Department of Nature Resource and Environmental Sciences. Pablo Parysow is with the School of Forestry at Northern Arizona University. Alan B. Anderson is with the USACERL in Illinois.

  • Copyright 2000 by the Soil and Water Conservation Society

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Journal of Soil and Water Conservation: 55 (3)
Journal of Soil and Water Conservation
Vol. 55, Issue 3
Third Quarter 2000
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Spatial Prediction and Uncertainty Analysis of Topographic Factors for the Revised Universal Soil Loss Equation (RUSLE)
G. Wang, G. Gertner, P. Parysow, A. B. Anderson
Journal of Soil and Water Conservation Jul 2000, 55 (3) 374-384;

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Spatial Prediction and Uncertainty Analysis of Topographic Factors for the Revised Universal Soil Loss Equation (RUSLE)
G. Wang, G. Gertner, P. Parysow, A. B. Anderson
Journal of Soil and Water Conservation Jul 2000, 55 (3) 374-384;
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