[论文解读] Occlusion-Free Conformal Lensing for Spatiotemporal Visualization in 3D Urban Analytics

Roberta Mota, Julio Henrique Sales Lima Silva+4 more|arXiv (Cornell University)|Feb 3, 2026

3D Modeling in Geospatial Applications被引用 0

一句话总结

论文提出一种沉浸式透镜可视化，使用视角相关切片和共形映射将时间序列数据嵌入建筑立面，降低3D城市分析中的遮挡与混乱；一项受控研究显示任务准确性提高、完成速度加快且用户信心更高。

ABSTRACT

The visualization of temporal data on urban buildings, such as shadows, noise, and solar potential, plays a critical role in the analysis of dynamic urban phenomena. However, in dense and geographically constrained 3D urban environments, visual representations of time-varying building data often suffer from occlusion and visual clutter. To address these two challenges, we introduce an immersive lens visualization that integrates a view-dependent cutaway de-occlusion technique and a temporal display derived from a conformal mapping algorithm. The mapping process first partitions irregular building footprints into smaller, sufficiently regular subregions that serve as structural primitives. These subregions are then seamlessly recombined to form a conformal, layered layout for our temporal lens visualization. The view-responsive cutaway is inspired by traditional architectural illustrations, preserving the overall layout of the building and its surroundings to maintain users' sense of spatial orientation. This lens design enables the occlusion-free embedding of shape-adaptive temporal displays across building facades on demand, supporting rapid time-space association for the discovery, access and interpretation of spatiotemporal urban patterns. Guided by domain and design goals, we outline the rationale behind the lens visual and interaction design choices, such as the encoding of time progression and temporal values in the conforming lens image. A user study compares our approach against conventional juxtaposition and x-ray spatiotemporal designs. Results validate the usage and utility of our lens, showing that it improves task accuracy and completion time, reduces navigation effort, and increases user confidence. From these findings, we distill design recommendations and promising directions for future research on spatially-embedded lenses in 3D visualization and urban analytics.

研究动机与目标

• 在密集3D城市场景中可视化随时间变化的建筑数据时，降低视觉杂乱和自遮挡。
• 开发基于共形映射的布局，将不规则建筑轮廓转化为结构化、分层的时间显示带。
• 整合沉浸式、透镜式可视化与视角相关去遮挡，以维持空间定位。
• 将该可视化与传统设计进行比较评估，以确定准确性、速度和感知可用性方面的提升。
• 给出设计建议并识别城市分析中空间嵌入透镜的未来研究方向。

提出的方法

• 用拓扑骨架和有向分割图将不规则建筑轮廓分割为规则的子区域。
• 对每个子区域计算共形映射，使用Schwarz–Christoffel映射创建层级带和扇区边界。
• 在相邻子区域之间拼接层级映射，形成透镜的统一共形布局。
• 在立面上叠加时间显示，作为编码时间推进的极坐标基轴的分层同心带。
• 实现视角相关切片以抑制自遮挡几何体，保持时间数据的可见性。
• 以受控用户研究评估该方法，并与并列显示和X光时空设计进行比较。

实验结果

研究问题

• RQ1 无遮挡共形透镜可视化在任务准确性和完成时间方面与传统并列与X光设计相比表现如何？
• RQ2 通过共形映射将随时间变化的数据嵌入建筑轮廓，是否提升在3D城市分析中的快速时空关联？
• RQ3 视角相关切片去遮挡在提高空间定位和降低导航努力方面有多大作用？
• RQ4 将时间图嵌入不规则城市几何形状中的共形带的设计权衡与用户感知收益有哪些？

主要发现

• 与传统设计相比，透镜方法在任务准确性和完成时间上有改进。
• 该可视化降低了导航努力，提升了用户在解读时空城市数据方面的信心。
• 共形映射和分层带能够在不损害空间定位的前提下，将时间序列数据在建筑立面中连贯嵌入。
• 视角相关切片去遮挡能力支持无遮挡感知，同时不过度扭曲周围的空间环境。
• 研究给出设计建议，并为未来在城市分析中的空间嵌入透镜研究指明了有希望的方向。