A fuzzy c-means classification of elevation derivatives to extract the morphometric classification of landforms in Snowdonia, Wales

Authors:
K. E. Arrell;P. F. Fisher;N. J. Tate;L. Bastin
Affiliations:
Earth and Biosphere Institute, School of Geography, University of Leeds, Leeds LS2 9JT, UK;Department of Information Science, City University, Northampton Square, London EC1V 0HB, UK;Department of Geography, University of Leicester, Leicester LE1 7RH, UK;School of Engineering and Applied Science, Aston University, Birmingham B4 7ET, UK
Venue:
Computers & Geosciences
Year:
2007

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Abstract

The increasing global coverage of high resolution/large-scale digital elevation data has allowed the study of geomorphological form to receive renewed attention by providing accessible datasets for the characterisation and quantification of land surfaces. Digital elevation models (DEMs) provide quantitative elevation data, but it is the characterisation and extraction of geomorphologically significant measures (morphometric indices) from these raw data that form more informative and useful datasets. Common to many geographical measures, morphometric measures derived from DEMs are dependent on the scale of observation. This paper reports results of employing a fuzzy c-means classification for a sample DEM from Snowdonia, Wales, with a number of morphometric measures at different resolutions as input, and morphometric classification of landforms at each resolution as output. The classifications reveal that different landscape components or morphometric classes are important at different resolutions, and that morphometric classes exhibit resolution dependency in their geographical extents. Examination of the scale dependency and behaviour of morphometric classifications of landforms at different resolutions provides a fuller and more holistic view of the classes present than a single-scale analysis.