Visioning exercises using computer-based environmental visualization hold significant promise for communicating information and engaging communities in the development and review of planning proposals. The field of visualization research and practice has achieved significant advances in computer technology to the point where it is now possible to represent alternative planning and engineering scenarios with a high degree of photographic realism, data-driven accuracy, and spatial and temporal interactivity. Despite the noteworthy benefits and developments in the field of environmental visualization technology comparatively little research has investigated how visualizations are used in urban planning practice. In particular, research is needed that examines how visualization presentation is affected by the social context of planning practice and the independent judgment of the preparer, which may in turn influence plan evaluation and decision making. In this paper I discuss the significance of visualization for urban planning and design and present the results from a study where students and representatives of a citizen-led planning committee evaluated four visualization presentation styles according to perceived realism, credibility and preference for the visualized environmental plans.
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