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By comparing the gridiron plans of ancient western cities with that of Tang Chang’an in the same scale,the authors find that a residential ward of Tang Chang’an was about the same size as an ancient western city.Thus the paper puts forward a hypothesis that Tang Chang’an was not a single city,but a cluster of hundreds of small towns with rigid layout.This theory is then proved by comparing a ward of Tang Chang’an with a typical small town in China from the perspectives of town scale,spatial layout,residential density,and land-use.The authors further explain the main cause for this unique urban form of Tang Chang’an,which was the compulsory migration policy.
By comparing the gridiron plans of ancient western cities with that of Tang Chang’an in the same scale, the authors find that a residential ward of Tang Chang’an was about the same size as an ancient western city. hypothesis that Tang Chang’an was not a single city, but a cluster of hundreds of small towns with rigid layout. This theory is then proved by comparing a ward of Tang Chang’an with a typical small town in China from the perspectives of town scale, spatial layout, residential density, and land-use.The authors further explain the main cause for this unique urban form of Tang Chang’an, which was the compulsory migration policy.