Abstract
During the period of rapid urbanization, the urban fringe area is the area where urban expansion occurs first, and land use change is the most active. Studying its evolution laws and characteristics is of great significance to urban planning and urban expansion, and the primary task of fringe area research is the spatial recognition and boundary division of urban fringe area. The previous methods for defining urban fringe areas are mainly divided into qualitative division based on experience and quantitative division based on indicators constructing. This research avoids the construction of index systems and the selection of mathematical models and improves the objectivity of the experiment. Based on the existing methods, this research considers the correlation between the difference of industrial distribution within cities and the urban spatial structure and spatial distribution of urban elements and considers the distance decay law of urban density. The urban fringe area in this research is defined as the distinction region of the service and manufacturing industry extending outward from the inside of the city. First, calculate the POI density of service industry and manufacturing industry. Then look for the inflection point where its density value drops sharply and get the isoline of that point. The range within the isoline is that the industry extends outward from the inner city and has reached the saturation state. Two types of industries can determine two isolines, and the belt region between those isolines is the urban fringe area. We use the urban fringe area identified from the impervious surface data to verify the result. The comparative results show that the identification method of urban fringe area based on POI works effectively, and it can successfully identify the multi-center urban core area. The method mentioned in this paper provides a new idea from the perspective of industrial activities in identifying and defining the belt region of urban fringe area.
Highlights
IntroductionUnder the influence of this process, the characteristics of urban and rural areas become more similar, and the boundary between urban and rural areas becomes more blurred, which leads to the proposal of the theory of urban fringe area
According to the value of the isoline and the theoretical radius S of the closed region S enclosed by the contour line, the fitting curve is the Densi-Graph, and the inflexion points of the two graphs are found by taking the derivative twice, which is the desired threshold
In terms of measurement perspective, the ICCA-based variable city boundary extraction method defines a “natural city” through a bottom-up approach based on street nodes, and its definition is based on the fact that human activities are constrained to streets—no streets no human activity, or alternatively no street nodes no residential places or cities [29]; this research focuses on the spatial aggregation of industrial point of interest (POI), and does not involve urban population, social space, and transportation networks and other elements, when selecting POI as the data source, on the one hand, it is considered that POI as the spatialization of geographic entity can reflect the real objective location, and on the other hand, the POI
Summary
Under the influence of this process, the characteristics of urban and rural areas become more similar, and the boundary between urban and rural areas becomes more blurred, which leads to the proposal of the theory of urban fringe area. Urban Fringe is a transitional zone between Urban and rural areas with both Urban and rural land use properties. It represents the area where urban expansion and industrial development first occur. The most widely used definition of urban fringe is proposed by Pryor [2] “a zone of change in land use, social and demographic characteristics, located in a land use conversion area between contiguous built-up areas and suburbs and a pure agricultural hinterland almost completely devoid of non-agricultural housing, non-agricultural occupation and non-agricultural land use”
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