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Planarity and Street Network Representation in Urban Form Analysis

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  • Boeing, Geoff

    (Northeastern University)

Abstract

Models of street networks underlie research in urban travel behavior, accessibility, design patterns, and morphology. These models are commonly defined as planar, meaning they can be represented in two dimensions without any underpasses or overpasses. However, real-world urban street networks exist in three-dimensional space and frequently feature grade separation such as bridges and tunnels: planar simplifications can be useful but they also impact the results of real-world street network analysis. This study measures the nonplanarity of drivable and walkable street networks in the centers of 50 cities worldwide, then examines the variation of nonplanarity across a single city. It develops two new indicators - the Spatial Planarity Ratio and the Edge Length Ratio - to measure planarity and describe infrastructure and urbanization. While some street networks are approximately planar, we empirically quantify how planar models can inconsistently but drastically misrepresent intersection density, street lengths, routing, and connectivity.

Suggested Citation

  • Boeing, Geoff, 2018. "Planarity and Street Network Representation in Urban Form Analysis," SocArXiv hma8y_v1, Center for Open Science.
    • Handle: RePEc:osf:socarx:hma8y_v1
    DOI: 10.31219/osf.io/hma8y_v1
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    References listed on IDEAS

    as
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