chapter 1 Introduction to Representing, Modeling, and Visualizing the Natural Environment / chapter 2 Keynote Paper: Representation of the Natural Environment / chapter 3 Keynote Paper: Representing Surfaces in the Natural Environment-Implications for Research and Geographical Education / chapter 4 Developing Ontologies from a Domain Expert Perspective / chapter 5 The Spatial Disaggregation of Great Britain and European Agricultural Land Use Statistics / chapter 6 Comparing Different Land Cover Data Sets for Agricultural Monitoring in Africa / chapter 7 Using GIS to Identify Wildland Areas in the North Pennines / chapter 8 Representations of Environmental Data in Web-Based GIS / chapter 9 Developing and Applying a Participative Web- Based GIS for Integration of Public Perceptions into Strategic Environmental Assessment / chapter 10 Keynote Paper: Challenges for Environmental Modeling / chapter 11 Keynote Paper: Spatial Scale and Neighborhood Size in Spatial Data Processing for Modeling the Natural Environment -- chapter 12 Invited Paper: Toward an Algebra for Terrain-Based Flow Analysis / chapter 13 Spatial Terrain Modeling: A Hierarchical Approach Toward 3-D Geospatial Data Set Merging / chapter 14 Regions and Patterns of Forest Change in Brazil: A Geographically Weighted Regression / chapter 15 GM(1,1)-Kriging Prediction of Soil Dioxin Patterns / chapter 16 Keynote Paper: Information Access, Depicting Geography, and Geographical Visualization Tools / chapter 17 Keynote Paper: Wiki Cartography and the Visualization of the Natural Environment / chapter 18 Invited Paper: GIS-Based Landscape Visualization—The State of the Art / chapter 19 Visualizing Species Distributions: The Role of Geostatistics and GIS in Understanding Large-Scale Spatial Variation in Breeding Birds / chapter 20 Visualizing Risk for Hill Walkers / chapter 21 Using Web-Based 3-D Visualization for Planning Hikes Virtually: An Evaluation / chapter 22 PastureSim: A Visualization Tool for Pasture Management