IAMG 2001--Cancún Technical Program--Session J

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The Application of GIS in the Interpretation of Radiometric and Electromagnetic Surveys to Mapping Geological and Environmental Features by Mark G. Stevenson, Performance and Initiatives Group, Buckinghamshire County Council, UK, Michael J. McCullagh*, School of Geography, University of Nottingham, UK, and Rob Cuss, British Geological Survey, UK This study looks at the application of GIS clustering approaches to airborne radiometric and electromagnetic point sampled data in an attempt to predict known geology in the UK at a small scale of part of the Derbyshire Dome area, and at a large scale of part of the Trent Valley. Spatially autocorrelated deviations in the automatic classification from the mapped geology were investigated further to determine likely causes for the misclassification. In the small scale trial the spatial resolution proved to be the critical limiting feature to accuracy and deviations were often related to analytical artefacts. In the large scale test spatial resolution once again was a problem, but the deviations provided some useful pointers to the possible development of an environmental monitoring system. Paper in PDF format Stevenson and others, Acrobat PDF, 6.3 megs.