Modeling urban redevelopment:A novel approach using time-series remote sensing data and machine learning

Accurate mapping and timely monitoring of urban redevelopment are pivotal for urban studies and decisionmakers to foster sustainable urban development.Traditional mapping methods heavily depend on field surveys and subjective questionnaires,yielding less objective,reliable,and timely data.Recent advancements in Geographic Information Systems(GIS)and remote-sensing technologies have improved the identification and mapping of urban redevelopment through quantitative analysis using satellite-based observations.Nonetheless,challenges persist,particularly concerning accuracy and significant temporal delays.This study introduces a novel approach to modeling urban redevelopment,leveraging machine learning algorithms and remote-sensing data.This methodology can facilitate the accurate and timely identification of urban redevelopment activities.The study’s machine learning model can analyze time-series remote-sensing data to identify spatio-temporal and spectral patterns related to urban redevelopment.The model is thoroughly evaluated,and the results indicate that it can accurately capture the time-series patterns of urban redevelopment.This research’s findings are useful for evaluating urban demographic and economic changes,informing policymaking and urban planning,and contributing to sustainable urban development.The model can also serve as a foundation for future research on early-stage urban redevelopment detection and evaluation of the causes and impacts of urban redevelopment.

Spatial restructuring and the logic of industrial land redevelopment in urban China: Ⅳ. A case study of jointly redevelopment by multi-actors

Within the inventory era, urban shrinkage characterized by economic decline and space decay has been widely witnessed in China. The modes and trajectories of urban redevelopment have thus become areas of major concern for both policymakers and scholars. Taking the multi-actor participation nature of redevelopment, this paper stemming from the game-theoretical approach demonstrates in empirical terms on two major fronts. First, the redevelopment of industrial land without the transfer of land use right is shown to be deadlocked by the incapacitation of the original land-user and unlocked with the participation of the new developer. Second, the preference of the original land-user to maximize its interests by operating by itself rather than continue to cooperate with the new developer is observed in the post-redevelopment stage. Therein, the entrepreneurial local government acts only as a “mediator” between the two market entities and tends not to directly intervene in their cooperation. Thus that, it is the reasonable distribution of potential benefits or the pricing of different rights in the land property right bundle rather than their definition that matters more for land redevelopment. Because the delineation of land property rights has never been a problem in a mature land market, particularly for stock industrial land.

Brownfield Redevelopment Toward Sustainable Urban Land Use in China

Brownfield redevelopment is a new urban land use strategy to pursue the ideal of sustainable development. It relieves environmental pressure and resolves the glaring contradiction between urban land idleness and urban sprawl. It addresses issues of urban land use and farmland protection in China. This paper compares brownfield with greenfield, and defines brownfield and its redevelopment. It elaborates general and special government policies for this sustainable land use strategy in the context of China. General policies contain two aspects: clarifying brownfield redevelopment's priority in Chinese urban planning and land use and setting a general quantitative redevelopment target. The extent of the government's special policies, which aim at coordinating three factors in the redevelopment process, namely govern- ments, developers and users, are divided into five areas: statistics and categorization, assessment and remediation, fi- nancial supports and tax incentives, environmental and legal liability, and publicity and guidance. The paper concludes the major functions of different levels of Chinese government in the redevelopment process, i.e. making general strategy, formulating legislation, spectifying regulations and technical standards, estimating and categorizing brownfield sites, drawing up brownfield planning, providing information and financial support, guiding developers, publicizing the strategy to the public, and checking reuse results.

Urban Redevelopment, Gentrification and Gentrifiers in Post-reform Inland China: A Case Study of Chengdu, China

Since its process evolved in recent years, the definition of gentrification has expanded to cover different forms of social upgrading, new spaces and new actors around the world. Studies on gentrification in Chinese cities began to take off in the 2000 s. However, they all mainly focused on the newly emerging global cities and there has been a lack of investigation on provincial cities. Furthermore, discussions on gentrifiers′ profiles and their motivations for housing choice are absent from literature on Chinese gentrification. Therefore, this paper aims to assess the relevance of the broad definition of gentrification in provincial Chinese cities through empirical research on urban redevelopment projects in Chengdu, and to examine the characteristics of gentrifiers(as new incoming residents) in it. The results show the rationality of gentrification processes as urban redevelopment in Chengdu, and reveal original outcomes on the corresponding gentrifiers′ profiles and the motivations behind their housing choice, which are different from the general features of gentrifiers in standard Western gentrification research.

Socioeconomic impact of urban redevelopment in inner city of Ningbo

Since market-oriented economy reform, China has experienced significant changes in urban landscapes and the internal structure of cities. Housing marketization provides an opportunity for households to choose their residences. However, not all households benefit equally from residential relocation. Residential relocation in urban China has relatively strong association with the household’s position within the spectrum from state redistribution to market reward than with life cycles and consequent adjustment of housing demand, which are the primary reasons for residential mobility in a mature market. In this research we focused on social aspects, mainly relating to the impact of urban redevelopment in inner city of Ningbo and the resultant potential housing problem. This research is based on a questionnaire survey that was conducted in three neighborhoods redeveloped at different time periods in the past fifteen years. The findings suggest that new strategy of redevelopment of the integrated envi-ronment of the old city while still improving the living condition for its residents can be heard due to the efforts of many people at various positions. Yet, many things need to be done to change people’s ideas: information and education through newspapers, academic discussions through academic journals, conferences, and reports to decision makers.

Redevelopment of Daqing Oil Field distributed earthquake disaster reduction system skeleton

Through investigation on the international development trend of earthquake disaster reduction system(EDRS)researches,a well finished Daqing Oilfield EDRS is introduced.Based on the PC System,redevelopment of the EDRS skeleton is well discussed,including the technical skeleton,function composition,structures of software and hardware,redevelopment languages,database,and remote linking and calling of analysis modules.Meanwhile,it is pointed out that extending and utilizing the function of remote sensing information on the basis of the current distributed EDRS skeleton will become another study direction of EDRS.

Application of CAD redevelopment in process design of stepping-mode laser blanking

To design a stepping-mode laser blanking process,in this study,CAD software was redeveloped based on VBA and a computer interface was established in the process design system. The program employs the modularization method to perform functions including one-key initialization of the process planning environment,creation and deletion of blanking steps,automatic identification of belt coordinates,recognition of the number of blanking steps in each domain,and the output and import of process data. The difficult problem of recognizing CAD block references with the same name in the automatic acquisition of belt coordinates is solved using the selection sets method,which greatly improves the efficiency of the process design,while also guaranteeing rapid development of the flexible data mold in stepping-mode laser blanking.

Mode and Mechanism of Urban Land Redevelopment

On the basis of summarizing and appraising the mode and mechanism of land redevelopment in urban regeneration in China’s transitional period,the relationship between land redevelopment system and urban regeneration is analyzed from the perspective of land system,and then the cooperative mechanism of urban regeneration and land redevelopment is recommended for promoting the development of urban regeneration.

Dilemma for the Redevelopment of Village and Town Construction Land, Formation Mechanism and Policy Suggestions

Under the context of economy new normal and rapid urbanization, the shift of economic growth, structural adjustment pains as well as pre-stimulus digestion comes coincidentally. The boundary red line of urban growth, the red line of the number of basic farms and the ecology red line makes the local to conserve land. Land stock for village and town construction is a huge amount of potential resources. Redevelopment of land for village and town construction provides ensured land security for the smooth progress of urbanization. Combining village and town construction land use characteristics and making in-depth analysis of the difficulties in the redevelopment of village and town construction and its inner mechanism, policies and suggestions were proposed for the redevelopment of village and town construction land in terms of land property, land price, market allocation, planning, surveillance and so on, so as to provide valuable reference for the smooth redevelopment of village and town construction land, and the system design of villages and towns.

Provably Secure APK Redevelopment Authorization Scheme in the Standard Model

The secure issues of APK are very important in Android applications.In order to solve potential secure problems and copyrights issues in redevelopment of APK files,in this paper we propose a new APK redevelopment mechanism(APK-SAN).By exploring sanitizable signature technology,APK-SAN allows the original developer to authorize specified modifier who can redevelop the designated source code of APK files.Our scheme does not require interactions between the developer and modifiers.It can reduce the communication overhead and computational overhead for developers.Especially,the signature of redeveloped APK files is valid and maintains the copyrights.The proposed APK-SAN signature can effectively protect the security of the redeveloped APK files and copyrights of the developer and modifier.

GM Site in the City of Lansing (Capital of Michigan State,U.S.) Redevelopment Proposal

This article is about the redevelopment proposal of GM site (Closed General Motors (GM) Plant—part of the Lansing Car Assembly Plant) in the City of Lansing, capital of Michigan State, and the final proposal is a Mixed-use Redevelopment. As an integrated and feasible research report, it is composed of eight parts: Site Analysis, Project Concepts or Ideas, Public Interest & Involvement, Feasibility Study and Financial Report, Market Analysis and Marketing Plan, Implementation, Property, Asset and Portfolio Management, and Reversion Plan.

Evolution of Transitional Institutions for Urban Land Redevelopment in China——Case in Guangzhou

Building effective institutions for markets is a great challenge to China's transitional economy. China's experience in establishing urban land markets is characterized by trial and error and the gradual evolution of transitional institutions. Based on archive data and interviews in a neighborhood(Jinhuajie) of Guangzhou,this research reveals that China's land redevelopment in the past two decades has followed an approach of partial and gradual reform,which was structured by the gradual evolution of transitional institutions to speed up local land redevelopment within the existing property rights system. Transitional institutions,including highly compensated residents' land use rights,in-kind land lease payment,flexible control on development rights of developers and short-term actual ownership of work units,are generated by the local government sequentially to dispel existing land use rights of different land users and make further development be able to follow market mechanisms.

生态环境保护中的尺度政治与正义实现:以A市绿中村改造为例

生态环境保护往往面临着保护责任和发展权益在整体社会与保护区局部群体间公平配置的难题。由于权益配置是不同层级政府与局部群体间博弈的结果,文章引入尺度政治与环境正义的理论框架,梳理用于解析生态环境保护中正义格局形成与演化的逻辑路径,并以中部某省会城市生态保护区内的村庄改造为例进行实证。研究发现:在未事先落实保护区居民发展权益的情况下,自上而下的刚性生态环境保护易造成不同尺度主体间的矛盾,表现为低尺度的居民发展权益受制于高尺度政府主体的保护要求;尺度重构成为前者寻求正义的一种非正规途径,表现为低尺度的居民寻求更高层级政府的介入,将其发展诉求的响应尺度上移,从而赋予发展与保护同等话语权,迎来环境正义实现的契机。诉诸非正规途径寻求正义本身也说明,中国城市生态环境保护中,缺乏保障低尺度群体合理权益的正规途径。文章结合理论与实证研究为此提供了解决思路。

城镇低效用地再开发实践与进展综述

城镇低效用地再开发是城市化发展到一定阶段后改善城镇生活居住环境、推动城镇化高质量发展的必然举措。本文在回顾城镇低效用地再开发政策沿革基础上,梳理低效用地再开发的相关概念,对低效用地的产生原因及再开发动因开展分析,对各地近年来的具体实践进行总结并提炼模式,分析目前城镇低效用地再开发所面临的困难挑战并给出了相关建议。研究认为,城镇低效用地的形成涉及城市发展阶段、资源禀赋、功能结构、土地权益以及城建管理等多方因素,目前各地低效用地再开发实践已形成多种改造模式、激励措施和补偿方式,低效用地再开发面临判别标准、产权类型、收益分配、价值显化等诸多难题,未来需要从法律、政府、标准、产权、资本和功能等多角度综合搭建实施路径。

为更新而租地——重新审视政府主导型租地更新模式

面对外部产业转移和内部要素价格上涨的压力,以城乡二元结构为背景的工业化已经难以适应高质量发展需求,面临转型发展的巨大挑战。作为工业化的主要空间载体,集体土地上旧厂房的改造成为释放产业空间的重要途径。在总结现有模式基础上,围绕土地产权构建分析框架,刻画旧厂房改造过程中各主体的权责关系,提出了政府租地更新的新模式,并以F市H科技城改造为例进行了案例研究。这一模式中政府成立公有性质的企业向村集体租地进行土地再开发,以土地租金的形式对村集体和村民进行补偿。租赁期满后,土地上的所有财产将全部返还给村民,实现政府、投资者和村民的多赢。跟以往模式相比,租地更新模式既保证了资本的正常运行,又发挥了各自的优势和特点,核心是低成本实现了土地产权正规化,提高了土地产权的实现度。

“节点-场所”模型发展脉络解析与国内外应用述评

城市轨道交通站点地区兼具“节点”和“场所”双重特征,通过回溯和系统梳理“节点-场所”模型提出及发展演变历程,深度剖析该模型应用拓展和发展脉络,将其分为“模型提出与完善、与TOD交叉融合、三维拓展”3个阶段,并对其应用和优化拓展方向进行讨论和反思。研究认为,源于欧洲城市再开发背景下提出的“节点-场所”模型具有定量分析优势和弹性评估框架,国内外学界从最初的单纯描述发展到站点分类和预测,逐步发展研究对城市再开发的推动作用,并与TOD理念进行互补和联动,但该模型在我国本土化应用实践中还需要继续加强国内城市站点地区持续性跟踪实证研究,应重视实地数据调研和网络数据校核,以期更好地促进轨道交通网络和站点全面融入到城市更新过程。

城市存量用地再开发中的供需关系转型与广州实践

为深入探讨城市存量用地再开发的供需逻辑与实现机制,指出当前我国城市存量用地再开发实践中的需求方是渴望持续升值的市场资本,而供给方则是同时受到“现状、规划、适用政策”制约的存量地块。在此基础上,以广州为例开展实证研究,进一步剖析受政策制度演进影响的供需关系曲线对存量用地再开发规模解释的内在规律,并基于供需关系视角,重新审视我国的城市更新问题,针对存量转型的发展前景与空间生产特征提出若干思考。

空间治理视角下全域土地整备规划方法研究——以广州市C区为例

改革开放以来,珠三角地区形成了大量“半城市化地区”,沉积了大量破碎零散、历史遗留问题众多的存量用地。随着存量规划时代的到来,土地整备成为盘活存量用地、促进土地集约节约利用、优化增量资源配置的重要抓手。但土地整备现实工作中却面临着成片连片整理难度大、土地供需两端错位匹配、规划体系衔接脱节等问题,进一步制约存量土地再利用和增量土地的系统开发。文章在国土空间治理能力和治理水平现代化的要求下,引入空间治理理念,创新探索全域土地整备规划方法,提出治理对象空间拓展、治理目标价值提升、治理主体协商共治与治理方式精细设计的思考。以广东省广州市C区为例,通过探索数字赋能、明确目标导向、推动机制创新等手段,梳理空间治理转型下“增存协同”的全域土地整备规划方法。

国家公园联动发展区宅基地盘活的模式选择:基于群体利益异质性的视角

研究目的:基于群体利益异质性视角,通过比较百山祖国家公园联动发展区内两个典型村庄的特征,辨析经济和社会利益异质性对宅基地盘活的农户自组织模式与政企合作模式选择的影响,为因地制宜选择国家公园联动发展区宅基地的盘活模式提供科学依据。研究方法:案例分析法、比较分析法。研究结果:(1)群体利益异质性所引致的选择性激励能促成宅基地盘活的集体行动;(2)资源禀赋、群体规模、人口流动频率的村庄特征影响群体利益异质性程度;资源禀赋较好、群体规模较小、人口流动频率较低的村庄经济和社会利益异质性较强,资源禀赋较好、群体规模较大、人口流动频繁的村庄经济利益异质性较强但社会利益异质性较弱;(3)经济和社会利益异质性均较强的村庄更容易形成农户自组织的宅基地盘活模式,经济利益异质性较强但社会利益异质性较弱的村庄则适用政企合作模式。研究结论:群体利益异质性是影响国家公园联动发展区宅基地盘活模式选择的关键因素。单一的强经济利益异质性不足以促成宅基地盘活的集体行动,还需发挥社会利益异质性对农户的内生激励作用,更好地落实国家公园全民共建共享的发展理念。