Geographic Information Systems and Science SECOND EDITION Paul A. Longley, Michael F. Goodchild, David J. Maguire, David W. Rhind © 2005 John Wiley and.

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Geographic Information Systems and Science SECOND EDITION Paul A. Longley, Michael F. Goodchild, David J. Maguire, David W. Rhind © 2005 John Wiley and Sons, Ltd 13. Goevisualization © John Wiley & Sons Ltd

© 2005 John Wiley & Sons, Ltd Overview How GIS affects visual communication User interfaces and spatial query How GIS-based representations may be transformed How 3-D geovisualization and VR help us to understand the world

© 2005 John Wiley & Sons, Ltd Geovisualization and GIS Maps are important decision support tools E.g. GIS and geopolitics Historic role of paper mapping GIS and geovisualization: ViSc, catrography, image analysis, etc. The ICA Commission on Visualization and Virtual Environments

© 2005 John Wiley & Sons, Ltd

Spatial query Improved ability to explore, synthesize, present, and analyze The WIMP interface: pointing, clicking, and dragging windows and icons Dynamic updates

© 2005 John Wiley & Sons, Ltd

Transformation Cartograms distort area or distance in order to achieve a specific objective Dasymetric maps use the intersection of two datasets (or layers in the same dataset) to obtain more precise estimates of a spatial distribution

© 2005 John Wiley & Sons, Ltd

Immersive interaction and PPGIS ViSc: use of new technology and media to convey multifaceted messages Better understanding of data and models leads to better understanding of real-world patterns and processes PPGIS may be reinforced through field computing

© 2005 John Wiley & Sons, Ltd

3-D GIS and VR systems Facilities to: Take different views Fly-throughs Reposition or rearrange Interact as avatars in virtual worlds Develop new representations Create immersive and semi-immersive VR systems

© 2005 John Wiley & Sons, Ltd

Consolidation ViSc in simulation and decision-making The medium and the message Clarifying or obscuring the message Data quality must be up to the applications task ‘Seeing is believing’ Is it? Should it be?