In 3D urban visualization, large data volumes related to buildings are a major factor that limits the delivery and browsing speed in a web-based computer system. This paper proposes a new approach based on the level o...In 3D urban visualization, large data volumes related to buildings are a major factor that limits the delivery and browsing speed in a web-based computer system. This paper proposes a new approach based on the level of detail （LOD） technique advanced in 3D visualization in computer graphics. The key idea of LOD technique is to generalize details of object surfaces without losing details for delivery and displaying objects. This technique has been successfully used in visualizing one or a few multiple objects in films and other industries. However, applying the technique to 3D urban visualization requires an effective generalization method for urban buildings. Conventional two-dimensional （2D） generalization method at different scales provides a good generalization reference for 3D urban visualization, Yet, it is difficult to determine when and where to retrieve data for displaying buildings. To solve this problem, this paper defines an imaging scale point and image scale region for judging when and where to get the fight data for visualization. The results show that the average response time of view transformations is much decreased.展开更多
The Municipality of Puebla is today＇s capital of the fourth most important city of Mexico. During 2009, its city hall ranked infirst place in category of metropolitan city as information and communication technologie...The Municipality of Puebla is today＇s capital of the fourth most important city of Mexico. During 2009, its city hall ranked infirst place in category of metropolitan city as information and communication technologies to reach part of ＂Digital City Award＂. From the strategy to use governmental efficiency, as well as interact with the population and socioeconomic development of the zone, free wireless internet was implemented in 39 areas to facilitate the access to training of citizenship by using this new form of media. The municipality has a population with great economic disparity, which is translated in strong social exclusion, located mainly in housing units and popular colonies with people in situation of hereditary poverty. Because of that, the need of knowing the profile and the consumer habits of mass media communication emerges. The research evaluates identification of actual and potential users of the web2.0, so it can be possible to recognize the chances of intervention in this segment and increase its participation on public character programs and promoting equality of opportunities and the possibility being a participative citizenship that contributes to the local human development.展开更多
基金Project 40471109 supported by the National Natural Science Foundation of China
文摘In 3D urban visualization, large data volumes related to buildings are a major factor that limits the delivery and browsing speed in a web-based computer system. This paper proposes a new approach based on the level of detail （LOD） technique advanced in 3D visualization in computer graphics. The key idea of LOD technique is to generalize details of object surfaces without losing details for delivery and displaying objects. This technique has been successfully used in visualizing one or a few multiple objects in films and other industries. However, applying the technique to 3D urban visualization requires an effective generalization method for urban buildings. Conventional two-dimensional （2D） generalization method at different scales provides a good generalization reference for 3D urban visualization, Yet, it is difficult to determine when and where to retrieve data for displaying buildings. To solve this problem, this paper defines an imaging scale point and image scale region for judging when and where to get the fight data for visualization. The results show that the average response time of view transformations is much decreased.
文摘The Municipality of Puebla is today＇s capital of the fourth most important city of Mexico. During 2009, its city hall ranked infirst place in category of metropolitan city as information and communication technologies to reach part of ＂Digital City Award＂. From the strategy to use governmental efficiency, as well as interact with the population and socioeconomic development of the zone, free wireless internet was implemented in 39 areas to facilitate the access to training of citizenship by using this new form of media. The municipality has a population with great economic disparity, which is translated in strong social exclusion, located mainly in housing units and popular colonies with people in situation of hereditary poverty. Because of that, the need of knowing the profile and the consumer habits of mass media communication emerges. The research evaluates identification of actual and potential users of the web2.0, so it can be possible to recognize the chances of intervention in this segment and increase its participation on public character programs and promoting equality of opportunities and the possibility being a participative citizenship that contributes to the local human development.
