Recent years have witnessed the rapid development and wide adoption of immersive head-mounted devices, such as HTC VIVE, Oculus Rift, and Microsoft HoloLens. These immersive devices have the potential to significantly extend the methodology of urban visual analytics by providing critical 3D context information and creating a sense of presence. In this paper, we propose an theoretical model to characterize the visualizations in immersive urban analytics. Further more, based on our comprehensive and concise model, we contribute a typology of combination methods of 2D and 3D visualizations that distinguish between linked views, embedded views, and mixed views. We also propose a supporting guideline to assist users in selecting a proper view under certain circumstances by considering visual geometry and spatial distribution of the 2D and 3D visualizations. Finally, based on existing works, possible future research opportunities are explored and discussed.

翻译：近年来，沉浸式头戴设备（如HTC VIVE、Oculus Rift和Microsoft HoloLens）迅速发展并得到广泛应用。这些沉浸式设备通过提供关键的三维背景信息并营造临场感，有望显著拓展城市可视化分析的方法体系。本文提出一个理论模型以刻画沉浸式城市分析中的可视化特征。基于该全面而简洁的模型，我们构建了二维与三维可视化组合方法的分类体系，将之区分为关联视图、嵌入视图与混合视图三类。同时提出辅助指南，通过考量二维与三维可视化的视觉几何与空间分布特性，帮助用户在特定场景下选择恰当的视图形式。最后，基于现有研究成果，探索并讨论了未来可能的研究方向。