Using geomorphological rules to classify photogrammetrically-derived digital elevation models
Abstract:An object-orientated expert system is used to identify beach and cliff landforms from Digital Elevation Models (DEMs) on the basis of topological and morphometric rules. The ord landform of the Holderness coast, north-east England, is interpreted as an indicator of enhanced cliff erosion and consists of various beach, till shore platform and associated steep/stable cliff constituents. Each of these are characterised by expert rules through their topological relationship with other constituents and typical values of height, slope, aspect and convexity. Two DEMs (1996 and 1997) are derived from the application of digital photogrammetry to stereo aerial photography provided from the LOIS (Land-Ocean Interaction Study) project. A rule-based classification of landforms is performed using COAMES (COAstal Management Expert System), producing results that conform to historical ground estimations and which identify zones of intense erosion and their commensurate movement with the ord landform over time. The result is achieved through the intelligent storage and operation of classification techniques, which should facilitate non-specialist usage.
Document Type: Research Article
Affiliations: 1: Spatial Information Research Centre, Department of Information Science, University of Otago, PO Box 56, Dunedin, New Zealand;, Email: email@example.com 2: Discovery Software, 36 Elm Park, Paignton, Devon TQ3 3QQ, UK 3: Uphill, Lustleigh, Newton Abbot, Devon TQ13 9SE, UK 4: Department of Geographical Sciences, University of Plymouth, Drake Circus, Plymouth, Devon PL4 8AA, UK
Publication date: July 1, 2003