Models for Creating the Prospective City Opportunities and challenges of 4D GIS and virtual environments

In this paper, we discuss the different applications of virtual city and environment models within different frameworks and try to reveal their important qualities in relation with their approaches for creating prospective urban developments. Certain uses of urban models and technologies are examined through seven critical cases with a focus on (what) is being modeled, place (where), actors (who), date (when), objectives (why) and approaches (how) adopted for design and development. In the elaboration part, we evaluate and comparatively discuss the interrelated conditions or circumstances that form the setting for these models. In conclusion, a new understanding of Geographical Virtual Environments is reviewed and the critical questions that can determine the future prospects are addressed.