用可解释模型揭示城市形态与功能的关系,助力智慧城市建设。
Interpreting core forms of urban morphology linked to urban functions with explainable graph neural network
- 提出核心城市形态表示CoMo,通过可解释图神经网络建模复杂形态
- 在波士顿验证,形态与用地效率相关性R²达0.721(p<0.001)
- 适用于城市规划、数字孪生领域,支持经典区位理论实证
理解城市形态与功能之间的高阶关系对构建可持续城市系统机制至关重要。然而,如何建立既准确又易于人类理解的复杂城市形态数据表征仍具挑战。本研究提出核心城市形态表征概念,开发了一种可解释深度学习框架,将复杂城市形态显式符号化为新型表示CoMo。通过稳定加权F1得分89.14%的模型解释,CoMo有效揭示了城市功能与核心形态间的关联。以波士顿为例,分析了建筑、街区及邻里尺度的核心形态,发现住宅形态沿城市主轴呈渐进式演变,符合中心-城市-郊区转型规律。进一步证明,城市形态直接影响土地利用效率,二者存在显著强相关(R²=0.721, p<0.001)。总体而言,CoMo可显式表征城市形态,为经典城市区位理论提供实证,并为数字孪生系统提供机制洞察。
原文摘要 · Abstract (English)
Understanding the high-order relationship between urban form and function is essential for modeling the underlying mechanisms of sustainable urban systems. Nevertheless, it is challenging to establish an accurate data representation for complex urban forms that are readily explicable in human terms. This study proposed the concept of core urban morphology representation and developed an explainable deep learning framework for explicably symbolizing complex urban forms into the novel representation, which we call CoMo. By interpretating the well-trained deep learning model with a stable weighted F1-score of 89.14%, CoMo presents a promising approach for revealing links between urban function and urban form in terms of core urban morphology representation. Using Boston as a study area, we analyzed the core urban forms at the individual-building, block, and neighborhood level that are important to corresponding urban functions. The residential core forms follow a gradual morphological pattern along the urban spine, which is consistent with a center-urban-suburban transition. Furthermore, we prove that urban morphology directly affects land use efficiency, which has a significantly strong correlation with the location (R2=0.721, p<0.001). Overall, CoMo can explicably symbolize urban forms, provide evidence for the classic urban location theory, and offer mechanistic insights for digital twins.
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