Accurate extraction of the boundaries of urban built-up areas (UBA) based on remote sensing and GIS technology is extremely important for predicting urban spatial evolution. Therefore, this study proposes a method for extracting urban built-up areas based on the impervious surface aggregation density (ISAD) of an object and uses the longtime series of the built-up area extraction results to analyze the spatial and temporal evolution characteristics of Beijing cities. The results show that the precision for extracting UBA using this method is 91.3%, which is better than that of existing methods based on supervised classification. The extraction results can also accurately depict the urban form and maintain the integrity of the built-up areas. Built-up areas in Beijing expanded from 1984 to 2018, with the most significant expansion in 2014-2018. In these 5 years, the expansion speed and intensity of Beijing respectively reached 270.70 km 2 /a and 1.65%, which were 2.43 times that of the entire research period. Built-up areas in Beijing have been expanding past their original limits over time in a 'centralized concentric circle' expansion model. The focus of the UBA moved northeast by 11.56 km. In the past 35 years, the contours of Beijing's urban borders have become increasingly complex, and the spatial form of built-up areas has become increasingly discrete. The analysis of the spatial evolution of UBA is beneficial for more sustainable, compact and coordinated urban development.

C. L. Yin

F. Meng

L. Guo

Y. X. Zhang

Z. Zhao

H. Q. Xing

G. B. Yao

Applied Spatial Analysis and Policy

描述该杂志有一个应用重点：它积极宣传地理研究在现实世界环境中的重要性它与政策相关：它既寻求读者群，也寻求从业者和学者的贡献实质性基础是空间分析：使用定量技术来识别地理环境中的模式和过程这些点的结合，充分体现在期刊的命名中，确立了在市场上的独特地位。基本原理地理视角对于理解周围世界的社会和物理组织一直至关重要我们。空间分析技术为收集和解释证据提供了强有力的手段，从而解决了诸如犯罪和剥夺、移民和人口结构调整、零售活动和就业变化、资源管理和环境改善等问题的关键问题。其中许多问题对学术研究和政策制定者同样重要，应用空间分析和政策旨在通过提供一个论坛来讨论各种不同背景下的应用研究，从而缩小这两种观点之间的差距。组织、行政机构和私营企业需要研究来支持他们的“循证”战略或政策。地理位置在这项工作的大部分工作中都至关重要，这些工作涉及广泛的学科，包括人口学、精算科学、统计学、公共部门规划、商业规划、经济学、流行病学、社会学、社会政策、健康研究、环境管理。 FOCUSAPPLIED SPATIAL ANALYSIS AND POLICY 将在不同的国际背景下利用来自不同问题领域的应用研究，例如交通、警务、教育、健康、环境和休闲。因此，该杂志将提供对跨空间现象的变化的见解，它将为领域之间和地点之间的比较政策分析提供证据，并激发关于在不同政策背景下转换空间分析方法和技术的想法。了解如何测量、监控和理解空间分布至关重要，其中许多对那些有责任规划和改善我们所生存的社会和环境的人有影响。读者群和编辑委员会作为一本专注于空间分析方法应用的期刊，应用空间分析与政策将吸引广泛学术领域的学者和学生、政府和行政机构的从业人员以及私营部门组织的顾问.编辑委员会反映了该期刊的国际性和多学科性质。

The journal "Applied Spatial Analysis and Policy" focuses on applied research, emphasizing the significance of geographical studies in real-world contexts, particularly in relation to policy. It aims to attract contributions from both readers and practitioners, with a core focus on spatial analysis that employs quantitative techniques to identify patterns and processes within geographical environments. This combination establishes a unique position for the journal in the market. A geographical perspective is crucial for understanding the social and physical organization of the world around us. Spatial analysis techniques provide powerful means for collecting and interpreting evidence, addressing key issues such as crime, immigration, retail activities, and resource management. These issues are equally important for academic research and policymakers. The journal aims to bridge the gap between academia and policy-making by providing a forum for discussing applied research in various contexts. Organizations, governmental agencies, and private enterprises require research to support their evidence-based strategies or policies, with geographical location playing a vital role in this work, which spans multiple disciplines, including demography, statistics, public planning, economics, and sociology. The journal will utilize applied research from different fields, covering topics such as transportation, policing, education, health, and the environment, offering insights into changes in cross-spatial phenomena, supporting policy analysis, and inspiring thoughts on applying spatial analysis methods in different policy contexts. Understanding how to measure, monitor, and comprehend spatial distributions is essential for those responsible for planning and improving the societies and environments in which we live. As a journal dedicated to the application of spatial analysis methods, "Applied Spatial Analysis and Policy" will attract scholars from a wide range of academic fields, practitioners from government and administrative agencies, and consultants from the private sector. The editorial board reflects the journal's international and multidisciplinary nature.

《Applied Spatial Analysis and Policy》期刊专注于应用研究，强调地理研究在现实世界中的重要性，尤其是与政策相关的领域。该期刊旨在吸引读者和从业者的贡献，核心内容是空间分析，利用定量技术识别地理环境中的模式和过程。这些要素结合在一起，赋予了期刊在市场上的独特地位。地理视角对于理解我们周围世界的社会和物理组织至关重要。空间分析技术为收集和解释证据提供了强有力的手段，帮助解决诸如犯罪、移民、零售活动、资源管理等关键问题。这些问题对学术研究和政策制定者同样重要。《Applied Spatial Analysis and Policy》期刊旨在通过提供一个讨论不同背景下应用研究的论坛，缩小学术界与政策制定者之间的距离。组织、行政机构和私营企业需要研究来支持他们的“循证”战略或政策，而地理位置在这些研究中扮演着重要角色，涉及多个学科，包括人口学、统计学、公共规划、经济学、社会学等。该期刊将利用来自不同领域的应用研究，涵盖交通、警务、教育、健康、环境等主题，提供对跨空间现象变化的见解，支持政策分析并激发在不同政策背景下应用空间分析方法的思考。了解如何测量、监控和理解空间分布对那些负责规划和改善社会与环境的人至关重要。作为一本专注于空间分析方法应用的期刊，《Applied Spatial Analysis and Policy》将吸引广泛学术领域的学者、政府和行政机构的从业人员，以及私营部门的顾问。编辑委员会反映了该期刊的国际性和多学科性质。

Category	Quartile
社会学	4
社会学, 环境研究	4
社会学, 地理学	4
社会学, 区域与城市规划	4

Extraction and Evolution Analysis of Urban Built-Up Areas in Beijing, 1984–2018

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Journal Info

Category	Quartile
REGIONAL & URBAN PLANNING	3