Abstract
The desire to capture natural regions in the landscape has been a goal of geographic and environmental classification and ecological land classification (ELC) for decades. Since the increased adoption of data-centric, multivariate, computational methods, the search for natural regions has become the search for the best classification that optimally trades off classification complexity for class homogeneity. In this study, three techniques are investigated for their ability to find the best classification of the physical environments of the Mt. Lofty Ranges in South Australia: AutoClass-C (a Bayesian classifier), a Kohonen Self-Organising Map neural network, and a k-means classifier with homogeneity analysis. AutoClass-C is specifically designed to find the classification that optimally trades off classification complexity for class homogeneity. However, AutoClass analysis was not found to be assumption-free because it was very sensitive to the user-specified level of relative error of input data. The AutoClass results suggest that there may be no way of finding the best classification without making critical assumptions as to the level of class heterogeneity acceptable in the classification when using continuous environmental data. Therefore, rather than relying on adjusting abstract parameters to arrive at a classification of suitable complexity, it is better to quantify and visualize the data structure and the relationship between classification complexity and class homogeneity. Individually and when integrated, the Self-Organizing Map and k-means classification with homogeneity analysis techniques also used in this study facilitate this and provide information upon which the decision of the scale of classification can be made. It is argued that instead of searching for the elusive classification of natural regions in the landscape, it is much better to understand and visualize the environmental structure of the landscape and to use this knowledge to select the best ELC at the required scale of analysis.
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Acknowledgments
The author gratefully acknowledges the use of data supplied by the South Australian Department of Primary Industries and Resources and PlanningSA. I am grateful to Professor Hugh Possingham for reading an early version of this work and to Neville Crossman and Dave Gerner for comments on the final draft. Infrastructure and support from GISCA, the National Centre for Social Applications of GIS, University of Adelaide is gratefully acknowledged. This research was supported by an Australian Postgraduate Research Award scholarship and an Australian Research Council Discovery Project grant DP0343036. CSIRO Land and Water also contributed to the final revision of this article.
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Bryan, B.A. Synergistic Techniques for Better Understanding and Classifying the Environmental Structure of Landscapes. Environmental Management 37, 126–140 (2006). https://doi.org/10.1007/s00267-004-0058-1
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DOI: https://doi.org/10.1007/s00267-004-0058-1