MODERN APPROACHES TO THE DELIMITATIONS OF URBAN AGGLOMERATIONS

2017 ◽  
Vol 7 (3) ◽  
pp. 80-86 ◽  
Author(s):  
Marina Ye. MONASTYRSKAYA ◽  
Oksana A. PESLYAK
Keyword(s):  
Urban Area ◽  
Economic Geography ◽  
Metropolitan Area ◽  
Urban Agglomeration ◽  
Metropolitan Region ◽  
Urban Region ◽  
Urban Agglomerations ◽  
Current Trends ◽  
European Science

The approaches to delimitation of urban agglomerations formed by European science and practice are analyzed and summarized in the present work. The essential defi nitional analysis of the concepts of «urban agglomeration», «urban area», «metropolitan area», «urban region», «metropolitan region» is conducted. The main algorithms of delimitation of urban agglomerations used in the fi elds of urbanology, management, statistics, economic geography are classifi ed. The current trends in the development and improvement of methods of delimitation of agglomerations proposed by European researchers are identifi ed.

scholarly journals Quantifying the Spatial Integration Patterns of Urban Agglomerations along an Inter-City Gradient

2019 ◽  
Vol 11 (18) ◽  
pp. 5000 ◽  
Author(s):  
Yiliang Wan ◽  
Chuxiong Deng ◽  
Tao Wu ◽  
Rui Jin ◽  
Pengfei Chen ◽  
...  
Keyword(s):  
Urban Landscape ◽  
Landscape Planning ◽  
Urban Expansion ◽  
Landscape Composition ◽  
Urban Agglomeration ◽  
Metropolitan Region ◽  
Sustainable Urban Development ◽  
Spatial Integration ◽  
Urban Agglomerations ◽  
Urban Rural

Understanding the integration process of urban agglomeration is essential for sustainable regional development and urban planning. However, few studies have analyzed the spatial integration patterns of metropolitan regions according to the impacts of landscape ecology along rail transit corridors. This study performed a comprehensive inter-city gradient analysis using landscape metrics and radar charts in order to determine the integration characteristics of an urban agglomeration. Specifically, we analyzed the evolution of spatial heterogeneity and functional landscapes along gradient transects in the Changsha–Zhuzhou–Xiangtan (CZT) metropolitan region during the period of 1995–2015. Four landscape functional zones (urban center, urban area, urban–rural fringe, and green core) were identified based on a cluster analysis of landscape composition, connectivity, and fragmentation. The landscape metric NP/LPI (number of patches/largest patch index) was proposed to identify the urban–rural fringe, which revealed that the CZT region exhibited a more aggregated form, characterized by a single-core, continuous development, and the compression of green space. The integration of cities has resulted in continued compression and fragmentation of ecological space. Therefore, strategies for controlling urban expansion should be adopted for sustainable urban development. The proposed method can be used to quantify the integration characteristics of urban agglomerations, providing scientific support for urban landscape planning.

Land Cover Analysis for Evapotranspiration Assessment in Catania Metropolitan Region

2013 ◽  
pp. 102-114 ◽  
Author(s):  
Paolo La Greca ◽  
Daniele La Rosa ◽  
Francesco Martinico ◽  
Riccardo Privitera
Keyword(s):  
Land Use ◽  
Land Cover ◽  
Metropolitan Area ◽  
Urban Sprawl ◽  
Land Use Planning ◽  
Urban Areas ◽  
Metropolitan Region ◽  
Urban Region ◽  
Climate Change Effects ◽  
Mt Etna

Today, the contraction of green zones is a key issue for land use planning with relation to climate change effects on urban areas. Furthermore, the loss of evapotranspiring surfaces and vegetated soils is one of the main consequences of urban sprawl processes. The authors present the case of Catania metropolitan area, the 2nd most populated urban region in Sicily. In particular, three municipalities are analyzed, as they present the most relevant urban sprawl processes. Inside this complex “urban jam,” there are still large non urbanized spaces. These patches (cultivated and abandoned agriculture land and lava fields from Mt. Etna), deeply fragmented, are often left for future development. These areas are particularly important in the examined context, considering the lack of green spaces for ecological functions and leisure. This chapter focuses on land cover analysis based on land use maps and oriented to assess evapotranspiration degree of the different land uses. Land use categories have been geographically sampled, and eight land cover types have been extracted with GIS by photo interpretation of high resolution orthophotos. Other sets of geodatabases have been used, including vectorial/raster cartographies and field surveys. Results from this evapotranspiration assessment can be useful for addressing land use planning of non urbanized areas within a sprawled metropolitan area, identifying new forms of agriculture, leisure, and environment protection.

scholarly journals Spatiotemporal Distribution Characteristics and Driving Forces of PM2.5 in Three Urban Agglomerations of the Yangtze River Economic Belt

2021 ◽  
Vol 18 (5) ◽  
pp. 2222
Author(s):  
Jin-Wei Yan ◽  
Fei Tao ◽  
Shuai-Qian Zhang ◽  
Shuang Lin ◽  
Tong Zhou
Keyword(s):  
Geographically Weighted Regression ◽  
Yangtze River ◽  
National Level ◽  
National Development ◽  
Urban Agglomeration ◽  
Spatiotemporal Distribution ◽  
Weighted Regression ◽  
Series Data ◽  
The Yangtze River ◽  
Urban Agglomerations

As part of one of the five major national development strategies, the Yangtze River Economic Belt (YREB), including the three national-level urban agglomerations (the Cheng-Yu urban agglomeration (CY-UA), the Yangtze River Middle-Reach urban agglomeration (YRMR-UA), and the Yangtze River Delta urban agglomeration (YRD-UA)), plays an important role in China’s urban development and economic construction. However, the rapid economic growth of the past decades has caused frequent regional air pollution incidents, as indicated by high levels of fine particulate matter (PM2.5). Therefore, a driving force factor analysis based on the PM2.5 of the whole area would provide more information. This paper focuses on the three urban agglomerations in the YREB and uses exploratory data analysis and geostatistics methods to describe the spatiotemporal distribution patterns of air quality based on long-term PM2.5 series data from 2015 to 2018. First, the main driving factor of the spatial stratified heterogeneity of PM2.5 was determined through the Geodetector model, and then the influence mechanism of the factors with strong explanatory power was extrapolated using the Multiscale Geographically Weighted Regression (MGWR) models. The results showed that the number of enterprises, social public vehicles, total precipitation, wind speed, and green coverage in the built-up area had the most significant impacts on the distribution of PM2.5. The regression by MGWR was found to be more efficient than that by traditional Geographically Weighted Regression (GWR), further showing that the main factors varied significantly among the three urban agglomerations in affecting the special and temporal features.

scholarly journals The Construction and Optimization of Ecological Security Pattern in the Harbin-Changchun Urban Agglomeration, China

2019 ◽  
Vol 16 (7) ◽  
pp. 1190 ◽  
Author(s):  
Rong Guo ◽  
Tong Wu ◽  
Mengran Liu ◽  
Mengshi Huang ◽  
Luigi Stendardo ◽  
...  
Keyword(s):  
Urban Agglomeration ◽  
Ecosystem Functions ◽  
Ecological Security ◽  
Least Cost Path ◽  
Rapid Urbanization ◽  
Songhua River ◽  
Urban Agglomerations ◽  
Ecological Corridors ◽  
Ecological Protection ◽  
Security Pattern

Urban agglomerations have become a new geographical unit in China, breaking the administrative fortresses between cities, which means that the population and economic activities between cities will become more intensive in the future. Constructing and optimizing the ecological security pattern of urban agglomerations is important for promoting harmonious social-economic development and ecological protection. Using the Harbin-Changchun urban agglomeration as a case study, we have identified ecological sources based on the evaluation of ecosystem functions. Based on the resistance surface modified by nighttime light (NTL) data, the potential ecological corridors were identified using the least-cost path method, and key ecological corridors were extracted using the gravity model. By combining 15 ecological sources, 119 corridors, 3 buffer zones, and 77 ecological nodes, the ecological security pattern (ESP) was constructed. The main land-use types composed of ecological sources and corridors are forest land, cultivated land, grassland, and water areas. Some ecological sources are occupied by construction, while unused land has the potential for ecological development. The ecological corridors in the central region are distributed circularly and extend to southeast side in the form of tree branches with the Songhua River as the central axis. Finally, this study proposes an optimizing pattern with "four belts, four zones, one axis, nine corridors, ten clusters and multi-centers" to provide decision makers with spatial strategies with respect to the conflicts between urban development and ecological protection during rapid urbanization.

scholarly journals Spatial Spillover Effect and Influencing Factors of Information Flow in Urban Agglomerations—Case Study of China Based on Baidu Search Index

2021 ◽  
Vol 13 (14) ◽  
pp. 8032
Author(s):  
Chengzhuo Wu ◽  
Li Zhuo ◽  
Zhuo Chen ◽  
Haiyan Tao
Keyword(s):  
Influencing Factors ◽  
Information Flow ◽  
Spillover Effect ◽  
Spillover Effects ◽  
Urban Agglomeration ◽  
Coordinated Development ◽  
Spatial Spillover ◽  
Urban Agglomerations ◽  
Search Index ◽  
Spatial Spillover Effect

Cities in an urban agglomeration closely interact with each other through various flows. Information flow, as one of the important forms of urban interactions, is now increasingly indispensable with the fast development of informatics technology. Thanks to its timely, convenient, and spatially unconstrained transmission ability, information flow has obvious spillover effects, which may strengthen urban interaction and further promote urban coordinated development. Therefore, it is crucial to quantify the spatial spillover effect and influencing factors of information flows, especially at the urban agglomeration scale. However, the academic research on this topic is insufficient. We, therefore, developed a spatial interaction model of information flow (SIM-IF) based on the Baidu Search Index and used it to analyze the spillover effects and influencing factors of information flow in the three major urban agglomerations in China, namely Beijing–Tianjin–Hebei (BTH), the Yangtze River Delta (YRD), and the Pearl River Delta (PRD) in the period of 2014–2019. The results showed that the SIM-IF performed well in all three agglomerations. Quantitative analysis indicated that the BTH had the strongest spillover effect of information flow, followed by the YRD and the PRD. It was also found that the hierarchy of cities had the greatest impact on the spillover effects of information flow. This study may provide scientific basis for the information flow construction in urban agglomerations and benefit the coordinated development of cities.

The Urbanization Spatial-Temporal Patterns Exploration of Capital Urban Agglomerations in Three Provinces of Central China

2013 ◽  
Vol 726-731 ◽  
pp. 5014-5019
Author(s):  
Jing Wang ◽  
Li Li Chang ◽  
Min Hang Yuan ◽  
Wen Yue Li
Keyword(s):  
Empirical Analysis ◽  
Regional Economics ◽  
Rapid Development ◽  
Spatial Association ◽  
Urban Agglomeration ◽  
Central China ◽  
Historical Evolution ◽  
Urban Agglomerations ◽  
Industrial Base ◽  
Old Industrial Base

Following strategies of Coastal Open Go West and Reviving Northeastern Old Industrial Base the state put forward the strategy of Rising of Central China in order to promote its rapid development. Urban agglomeration in Central China is becoming academic focus with unprecedented development momentum. It applies multidisciplinary theory of human geography, regional economics, etc. and takes urban agglomeration of Hunan, Henan and Hubei provinces for example to empirical analysis. Firstly, analyzing the historical evolution, urbanization space development and patterns then comes to spatial association of urban and rural through comparison, Finally, showing the development characteristics of urban agglomeration in Central China and putting forward urbanization suggestion.

scholarly journals The Evolution of the Urban Spatial Pattern in the Yangtze River Economic Belt: Based on Multi-Source Remote Sensing Data

2018 ◽  
Vol 10 (8) ◽  
pp. 2733 ◽  
Author(s):  
Yang Li ◽  
Hua Shao ◽  
Nan Jiang ◽  
Ge Shi ◽  
Xin Cheng
Keyword(s):  
Size Distribution ◽  
Urban Areas ◽  
Yangtze River ◽  
Size Structure ◽  
Urban Land ◽  
Urban Agglomeration ◽  
Spatial Distance ◽  
The Yangtze River ◽  
Urban Agglomerations ◽  
Urban Size

The development of the Yangtze River Economic Belt (YREB) is an important national regional development strategy and a strategic engineering development system. In this study, the evolution of urban spatial patterns in the YREB from 1990 to 2010 was mapped using the nighttime stable light (NSL) data, multi-temporal urban land products, and multiple sources of geographic data by using the rank-size distribution and the Gini coefficient method. Through statistical results, we found that urban land takes on the feature of “high in the east and low in the west”. The study area included cities of different development stages and sizes. The nighttime light increased in most cities from 1992 to 2010, and the rate assumed an obvious growth tendency in the three urban agglomerations in the YREB. The results revealed that the urban size distribution of the YREB is relatively dispersed, the speed of urban development is unequal, and the trend of urban size structure shows a decentralized distribution pattern that has continuously strengthened from 1990 to 2010. Affected by factors such as geographical conditions, spatial distance, and development stage, the lower reaches of the Yangtze River have developed rapidly, the upper and middle reaches have developed large cities, and a contiguous development trend is not obvious. The evolution of urban agglomerations in the region presents a variety of spatial development characteristics. Jiangsu, Zhejiang, and Shanghai have entered a phase of urban continuation, forming a more mature interregional urban agglomeration, while the YREB inland urban agglomerations are in suburbanization and multi-centered urban areas. At this stage, the conditions for the formation of transregional urban agglomerations do not yet exist, and there are many uncertainties in the boundary and spatial structure of each urban agglomeration.

scholarly journals Urban geographic processes of settlements network of Ljig municipality

2005 ◽  
Vol 85 (2) ◽  
pp. 87-96 ◽  
Author(s):  
Dragana Matijevic
Keyword(s):  
Metropolitan Area ◽  
Strong Influence ◽  
Functional Area ◽  
Strong Concentration ◽  
Urban Agglomerations ◽  
Modern Development ◽  
Functional Zone

Principles of modern development of settlements are taking place under the strong influence of great urban agglomerations. Belgrade and its gravitational role have triggered huge spatial and populational changes with distinctive differences within its metropolitan area. In northern parts of Belgrade functional zone, there are zones of strong concentration of population and economy, as opposed to southern parts, where depopulation and dissection of economy and activities are present. As a part of Belgrade functional area, settlements network of Ljig municipality has been subject to considerable urban-geographic changes. This paper gives the analysis of all changes in settlements network which occurred as a consequence of gravitational impacts of the capital.

scholarly journals El surgimiento de la megaurbanización Nordelta en la Región Metropolitana de Buenos Aires: consideraciones en torno a las nociones de ciudad-fragmento y comunidad purificada / The Emergence of the Nordelta Megaurbanization in the Metropolitan Region of Bu

2007 ◽  
Vol 22 (2) ◽  
pp. 363 ◽  
Author(s):  
María Florencia Girola
Keyword(s):  
Metropolitan Area ◽  
Buenos Aires ◽  
Metropolitan Region ◽  
Permanent Housing

En este artículo se focaliza uno de los procesos más generalizados y polémicos que se registran en las grandes ciudades contemporáneas: el desarrollo de conjuntos residenciales que cuentan con seguridad y que sirven de vivienda permanente a los sectores medios y altos de la población. Más concretamente, intentamos cuestionar y examinar –desde una perspectiva etnográfica– las visiones sobre estos conjuntos ancladas en torno a la categoría de fragmentación urbana, a partir del análisis de un ejemplo específico: la emergencia de grandes emprendimientos en la Región Área Metropolitana de Buenos Aires; en este caso se trata de una singular ciudad privada y periférica. AbstractThis article focuses on one of the most generalized, polemic processes recorded in major contemporary cities: the development of residential complexes with security that serve as permanent housing for the middle and upper classes of the population. More specifically, the author attempts to use an ethnographic perspective to question the views on these complexes placed within the category of urban fragmentation on the basis of the analysis of a specific example; the emergence of major developments in the Metropolitan Area of Buenos Aires; in this case, an unusual private, peripheral city.

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