Abstract
City classification can provide important data and technical support for city planning and government decision-making. Traditional city classification mainly relies on the accumulation and analysis of census data, which requires a large time period and relies heavily on historical and statistical data. This paper mainly utilizes Luojia I Night-Time Light (NTL) images to analyze the rank classification of cities in Henan Province, China. Intensity values can be expressed as the mathematical surface of continuous human activities, and the basic characteristics of urban structures are determined by analogy with the topography of the earth. A connectivity analysis method for NTL images is proposed to analyze the connected regions of images at different intensity levels. By constructing a tree structure, different cities can be analyzed “crosswise” and “lengthwise” to generate a series of parametric information from connected regions of NTL images. Based on these parameters, 18 cities in Henan Province were classified and analyzed. The results show that these attribute information can be well used for city center detection and grade classification, and can meet the requirements of application analysis.
Highlights
In 2011, urbanization in China reached 51.27%, with the urban population surpassing the rural population for the first time
The distribution map of Henan Province can be obtained according to the existing vector data, by which Night-Time Light (NTL) image data can be divided into different city units
The multi-edge development mode has a multilevel structure and few nodes in the urban center tree (e.g., Kaifeng RemotaenSdensS.h2a0n20g,q1i2u, 1c7i0ti5es), while the multicenter development mode has a structure with few levels and13 of 19 many nodes (e.g., Luoyang city)
Summary
In 2011, urbanization in China reached 51.27%, with the urban population surpassing the rural population for the first time. By the end of 2018, the urban population had reached 59.58% [1]. It is considered that if the terrain is completely flat, the soil quality is the same, the population distribution is uniform, and the traffic convenience is equal, the distribution of the town is uniform and regular in an equilateral hexagonal arrangement [5]. “Central Place Theory” has reference value to urban planning, production layout and regional planning. The terrain is not flat, the population density is not consistent, the consumption capacity and the traffic situation are not the same, so the distribution of the city is not regular, generally presents a hierarchical system, and is affected by the distribution of traffic trunk lines and resources [6]
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