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Updated: Dec 26, 2025

Trajectory Data Analyses for Pedestrian Space-time Activity Study
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Common power laws for cities and spatial fractal structures.

Tomoya Mori1,2, Tony E Smith3, Wen-Tai Hsu4,5

  • 1Institute of Economic Research, Kyoto University, Yoshida-Honmachi, Sakyo-Ku, Kyoto 606-8501, Japan; mori@kier.kyoto-u.ac.jp.

Proceedings of the National Academy of Sciences of the United States of America
|March 8, 2020
PubMed
Summary

Large cities worldwide are more spaced out than random chance predicts. Analysis reveals a fractal spatial structure in city sizes across multiple countries, suggesting underlying organizational principles.

Keywords:
city sizefractal structurepower lawspatial hierarchy

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Area of Science:

  • Urban studies
  • Geographic information science
  • Network science

Background:

  • City-size distributions often follow power laws globally.
  • The spatial arrangement of cities at various scales is less understood.
  • Previous research primarily focused on national-level city-size distributions.

Purpose of the Study:

  • To investigate the spatial distribution of cities beyond national level.
  • To explore the existence of power-law distributions within country-specific spatial hierarchies.
  • To identify potential fractal patterns in urban geography.

Main Methods:

  • Analyzing city-size data from China, France, Germany, India, Japan, and the United States.
  • Quantifying the spatial spacing of large cities.
  • Constructing recursive spatial hierarchies based on city locations.
  • Examining city-size distributions within these hierarchical structures.

Main Results:

  • Large cities exhibit significantly greater spatial separation than expected by random distribution.
  • City-size distributions within hierarchical partitions consistently display power-law characteristics.
  • These power-law distributions are remarkably similar across different partitions and countries.
  • The findings suggest a self-similar spatial fractal structure in urban systems.

Conclusions:

  • Urban systems possess a spatial fractal structure, influencing city sizes at multiple scales.
  • The observed non-random spatial organization of cities has implications for urban planning and theory.
  • Power-law distributions are a robust feature of city sizes within hierarchical geographic structures.