Generating Alternative Land‐use Allocation for Mixed Use Areas: Multi‐Objective Optimization Approach

Current research is carried out with an intention to present an optimization approach for the urban land‐use allocation problem by generating Pareto optimum solutions considering two objectives—maximizing compatibility among adjacent space uses of a study area without compromising the area’s total land price and maximizing the price of plot of each individual owner. Considering the non‐linear characteristics of the objective functions, a multi‐objective evolutionary algorithm approach called Non‐Dominated Sorting Genetic Algorithm‐II (NSGA‐II) is applied to obtain Pareto optimal land‐use allocation subject to different set of constraints. The objective functions are tested over a case study area of Dhaka, Bangladesh. The resulting NSGA‐II model produces 24 Pareto optimal solutions of land‐use allocation, allowing tradeoff between maximizing compatibility and land price from one solution to other. This research also expresses the potential of the model to aid the policymakers and city planners of development authorities by providing alternative land‐use plans, and thereby predicting the consequences of any plan before practical application.     

Coordinating Transport and Urban Planning: From Ideologies to Local Realities

In Europe, the idea that coordinating transportation and urban planning is a necessary condition for setting sustainable urban development into motion has spread throughout academic and professional circles. While this concern is not new, the objectives underlying transport and urban planning coordination have deeply changed over the last decades. How have local authorities translated the requirements and objectives of national laws? How have they accounted for the evolution of these global objectives? What factors explain innovation and continuity in the relationship between land use planning and transport policies? In a comparative research between Switzerland and France, we addressed the question of political change by reconstituting the “trajectories” of four urban areas: Geneva and Bern in Switzerland and Strasbourg and Bordeaux in France. We have described the policy paths of these urban areas since the end of the 1960s by focusing on the contents of master plans, the principal technical solutions and projects that have been implemented, and the means of inter-sectorial coordination used. For each case, factors of change or inertia have been identified by focusing on three main variables that are often studied alternatively in public policy analysis: ideas, institutions and interests.     

ENVIRONMENTAL HAZARDS AND URBAN ABANDONMENT: CASE STUDIES AND TYPOLOGICAL ISSUES

The article discusses the phenomenon of urban abandonment as a result of environmental hazards. Seen as an outcome of environmental drivers, the underlying assumption is that a characteristic of environmental hazards is their spatial and temporal constancy of impact, whereby processes and phenomena having taken place in the past have their analogies in the present. In order to generate insights for future research and policy development, there is a need to pay greater attention to the precarious relationship between humans and the natural environment, not least by drawing lessons from the past through the study of historical cases. The article clarifies the dynamic interactions of drivers and their progression through various stages of urban abandonment. This is done by recourse to an analysis of some general trends and an in‐depth examination of three selected case studies from Poland. It has two objectives. The first is to identify the historical role of environmental drivers in the process of urban abandonment, while the second one is to contribute to the typology of environmentally related processes of urban abandonment in order to better identify future calamities. With respect to the former, the findings reveal that the relation between environmental hazards and urban abandonment is pertinent in regions with specific geographic conditions and pertains only to certain categories of urban settlements. With respect to the latter, by drawing on these findings, we propose some alterations and amendments to McLeman's comprehensive model of settlement abandonment in the context of global environmental change.     

基于分形理论的长株潭城市群等级规模结构研究及对策

运用城市群等级规模结构分形理论和方法,对长株潭"3+5"城市群(以下简称"3+5"城市群)的等级规模结构进行了实证研究,通过测算几年来"3+5"城市群等级规模分布的分维值,得出结论:"3+5"城市群规模分布符合分形特征;模型拟合认为其人口、经济分布的分维值均大于1,表明"3+5"城市群等级规模结构集中,已处于发展的相对成熟阶段。为此在对这些特征做出解释的基础上,认为可从强化首位城市、加快长株潭一体化建设、提升次中心城市、重点发展中小城市、加快小城镇建设等方面着手对长株潭城市群等级规模结构进行优化。     

基于高速公路交通流的江苏省城市空间关联特征

在江苏省高速公路网络2012年12月OD流量数据和通行时间数据支撑下,本文从县市尺度出发,在对城市空间关联的节点、路径和组团等要素分析基础上,尝试勾绘关联特征的基本图示。结论如下:①城市节点分布有一定的等级性,且节点重要性本身与其社会经济发展状况或在高速公路的功能定位有关。②单一组团或近邻组团以"中心城市+关联节点"进行关联,且城市间的通行时间基本在1小时内,而中长距离的双核心或多核心的组团则以中心城市作为联系基轴建构,且通行时间在1-3小时之间。③综合节点、路径和组团等要素勾绘的城市关联特征模式包含苏北系统、跨江系统和苏南系统,且该模式昭示以"多板块协同发展"的思路规划区域发展战略可作为优先考虑的方案。     

东北地区城市规模分布的分形特征

本文借助Zipf公式考察了东北地区(1994)城市规模分布的分形几何特征,发现辽宁省城市规模分布具有双分形结构,吉林省城市规模分布具有单分形结构,而黑龙江省城市规模分布则具有局部分形结构,整个东北地区的城市规模分布呈现局部分形图式,但显示出双分形迹象。文章得出了一些重要的理论结论,并为东北三省的城市体系等级结构优化提出了若干建议。     

The origin of the road and city network of Roman Pannonia

In any one macro-region there is usually one brief period of large-scale city foundation. Within Pannonia the road and city building impulse was introduced from outside along differing axial lines at three different times. Impulse chains extended from the generating points or areas to the primary objectives. The pattern of the network was determined by the selection of basic strategic objectives, which were placed on specific sites of high military-transport potentiality. Each of the road networks proved to be fanshaped composed of three elements: the axial entry route, the “cross-bar” along the Danube and “ribs” or “trusses” joining key border posts to the axis. The total pattern was that of a parallelogram of urban corridors surrounding a vacant middle.     

A Minimax Method for Finding the k Best “Differentiated” Paths

In real-world applications, the k-shortest-paths between a pair of nodes on a network will often be slight variations of one another. This could be a problem for many path-based models, particularly those on capacitated networks where different routing alternatives are needed that are less likely to encounter the same capacity constraints. This paper develops a method to solve for k differentiated paths that are relatively short and yet relatively different from one another, but not necessarily disjoint. Our method utilizes the sum of a path's distance plus some fraction of its shared distance with each other path. A minimax algorithm is used to select the path whose largest sum of length, plus shared length vis-à-vis each previously selected path, is as small as possible. We present computational results for the Chinese railway system, comparing the paths generated by a standard k-shortest-path algorithm with those from our new model.     

理解中国城市生活方式：基于时空行为的研究框架

面对以人为核心的城市研究与规划需求,如何理解城市居民的日常生活并分析城市空间与居民生活方式之间的互动关系就显得尤为重要。转型期背景下,受到制度与市场双重力量的驱动,中国城市生活方式表现出特殊性。本文从生活方式理论、时间地理学和活动分析法的理论基础出发,分析生活方式与时空行为的关系,指出从行为角度进行生活方式研究的可行性;提出基于时空行为变量测度生活方式的指标体系,将出行模式、与城市空间的关系和日程安排作为度量生活方式的核心指标;并构建了生活方式的影响机制分析框架,提出制度、技术、地理背景和社会关系是影响生活方式的主要因素,为更好的理解中国城市社会空间与居民生活提供有效途径。     

Routeing Heritage for Tourism: making heritage and cultural tourism networks for socio-economic development

Heritage routes and itineraries are mechanisms being used towards tourism needs and objectives. This paper defines these routes, reviews their context, and considers some examples in Europe. It looks at the 'why' and 'how' of heritage routes being established, and shows the inputs that tourism causes and needs. The particular dimensions to routes and what they bring and require are discussed. The associated demand of networks and networking is discussed and the potential beneficial aspects are described. The especial capacity of itineraries to bring about cross-boundary dialogue and interaction are highlighted and the wider potential of this feature for global society is alluded to. The need is suggested for more research into the use, outcomes and effects of routes.     

Brownfield Development: Are We Using the Right Targets? Evidence from England and Germany

Urban brownfield sites are a major planning concern across Europe, and most European countries have strategies to reuse them. In England and Germany, quantified targets for brownfield development have been set at the national level, with the twin objectives of furthering urban regeneration and reducing greenfield development. This paper explores the implications of these quantified targets, particularly with respect to their ability to contribute to meeting these twin objectives. It explores their shortcomings and highlights implementation problems.     

1990年代以来广州城市涂鸦空间的形成与嬗变——基于空间生产的视角

改革开放后,涂鸦伴随后现代街头文化传入中国,逐渐发展成为融合中西方的文化景观。涂鸦作为以城市公共空间为载体的创作形式,兼具艺术内涵和反叛色彩的双重特性,因此也被视为城市管理的不稳定因素,使其空间的生产常充满了多元主体的冲突。本文运用实地调研和深度访谈的方法,通过探究广州城市涂鸦空间的形成演变,透视当代中国城市后现代文化空间的生产及其意义。研究发现,广州城市涂鸦的空间形成主要经历了三个阶段,呈现出以老城区为中心逐步向外围地区扩展的特点。涂鸦手通过建构创作空间、利用资本力量、与政府博弈等手段实现对城市空间的占据,并使涂鸦逐渐成为具有中国本土化特征的后现代文化空间的范例。本文通过广州案例的研究,希望为今后中国城市空间治理的实践及空间正义的相关讨论提供参考借鉴。     

Policy Impact and House Price Development at the Neighbourhood-level—a Comparison of Four Urban Regeneration Areas using the Concept of “Artificial” Value Creation

Urban planning measures and restructuring policies tend to cause unintended increases in house prices. The study compares urban renewal areas with respect to such policy impact on housing and neighbourhood quality and house prices in two city-contexts: Amsterdam and Budapest. It shows how four neighbourhoods that have been subject to various forms of urban regeneration differ in their trajectories of house price development. The results tie with well-documented, mostly Anglo-American experiences of related phenomena such as New Urbanism, Neo-traditional communities and gentrification. Furthermore, the study merges two research objectives that often are seen as incompatible: housing markets and urban regeneration.     

Hedonic pricing analysis of the influence of urban green spaces onto residential prices: the case of Leipzig,Germany

In the light of global urbanization and biodiversity loss, ecosystem services provided by urban green spaces (UGS) are becoming increasingly important, not least as a recovery and recreation opportunity for citizens. The valuation of UGS is significant for urban planners, who make decisions on the creation or removal of UGS. We analysed the influence of UGS on residential property prices in Leipzig, Germany, by applying a hedonic pricing analysis. This analysis complements the existing literature by considering both sale and rental prices for flats and houses; moreover, the shape of UGS is taken into account explicitly; finally, it is the first study in Germany to analyse UGS in hedonic studies to such an extent. The results demonstrate that the size of the nearest UGS has a stronger impact on prices compared to the distance from it. With respect to shape, we found that the simpler the UGS shape, the higher the prices. Although we find an impact of UGS on prices, the impact is smaller than that of other characteristics. The proposed valuation approach and obtained results inform urban planners regarding the design of new UGS and raise awareness about potential intended and unintended economic and social effects.     

99世博会对昆明城市形象的影响研究

使用问卷调查数据,从世博会的形象、世博园与昆明的形象、世博园在潜在游客中的形象位置、世博园在昆明景区中的相对形象地位等四个方面研究'99昆明世博会对昆明城市形象的影响问题,通过量化研究,得出世博会和世博园都对昆明的形象产生了较好的推动作用、世博会结束后世博园的形象与世博会的形象认知产生了分离现象的结论,分析了世博园尚未成为来昆游客游览和旅行社组织旅游线路首选景点的原因。     

Interpreting urban space through cognitive map sketching and sequence analysis

Traditionally, analysis of sketch maps of urban areas has focused on the interpretation of hand‐drawn renditions of features that are most familiar to individuals. Few researchers have investigated the sequence that sketchers use to identify features on the urban landscape and how these features are linked together to form a coherent ‘picture’ of an area. This article builds upon previous research by exploring the sequential pattern of sketch map creation. Two research questions are proposed, namely, can a repetitive sequential order in element inclusion be identified for different individuals sketching the same urban environment? If so what features are mapped in which order to create the sketchers' image of the city? Findings suggest that three distinct groups of cognitive maps exist, namely, sequential, spatial and hybrid, and that the map elements of each group are organised in a distinctive manner with paths and landmarks as principal elements. It is suggested that insights into this process provide more substance to understanding how individuals interpret and structure urban space and use this information to navigate both known and new environments.     

A Bi‐objective Optimization Model for Designing Safe Walking Routes for School Children

This study uses a mathematical optimization approach to design safe walking routes from school to home for children. Children are thought to be safer when walking together in groups rather than alone. Thus, we assume that the risk of walking along a given road segment in a group is smaller than that of walking the same segment alone. At the same time, the walking route between school and home for each child should not deviate substantially from the shortest route. We propose a bi‐objective model that minimizes both the total risk (particularly, the total distance walked alone) and the total walking distance for all children. We present an integer programming formulation of the proposed problem and apply this formulation to two instances based on actual road networks. We obtain Pareto optimal solutions using a mathematical programming solver and analyze the characteristics of the solutions and their potential applicability to real situations. The results show that the proposed model produces much better solutions compared with the solution where each child walks along the shortest path from school to home. In some optimal solutions, only a small deviation from the shortest path results in a dramatic reduction of the risk objective.     

Measuring Spatial Correspondence among Network Paths

Measuring the spatial correspondence among geographic features is an important component of many analyses such as those seeking to identify similar or dissimilar features, explore the extent to which change has taken place, and explain the processes influencing spatial change. In networked systems, the paths providing connectivity between pairs of nodes are often the geographic features among which spatial correspondence is to be assessed. That is, given a set of paths between a pair of nodes, the extent to which they share portions of the network and spatially deviate from one another can provide insight on the factors underlying the use of a system. While methods for measuring the spatial correspondence among specific types of network paths have been devised, this article proposes a methodology for measuring the spatial correspondence among the topology of network paths of any type, including those involving redundant use of network space. By basing comparisons upon the topologic relationships among the paths, the proposed approach better accounts for average spatial deviation as well as the asymmetric spatial relationship between pairs of paths, enabling greater stability and consistency in the analysis of their spatial characteristics. The developed methodology is applied to evaluate variability in spatial correspondence among a set of network paths to demonstrate its utility.     

基于新地理信息技术的南京市游客流动性空间特征研究

利用新地理信息技术,采集500个游客GPS地理标记照片,运用GIS空间分析方法,分析游客在南京城市内部及其与长三角其它城市空间流动特性,并提炼游客空间行为一般模式。发现:①南京城市内部旅游流在主城区集聚,整体上呈现中心城区向四周扩散的趋势;且在空间形态上形成小型化、斑块化的布局特征。②南京与长三角周边城市的线形路线以点-点模式为主导,地域模式以便利的同城市中心流动为多数,其旅游流流动模式与已有典型模式基本吻合,同时长三角地区旅游流呈现等级扩散特征。     

URBAN GROWTH EXTERNALITIES AND NEIGHBORHOOD INCENTIVES: ANOTHER CAUSE OF URBAN SPRAWL?*

ABSTRACT This paper suggests a cause of low density urban development or urban sprawl that has not been given much attention in the literature. There have been a number of arguments put forward for market failures that may account for urban sprawl, including incomplete pricing of infrastructure, environmental externalities, and unpriced congestion. The problem analyzed here is that urban growth creates benefits for an entire urban area, but the costs of growth are borne by individual neighborhoods. An externality problem arises because existing residents perceive the costs associated with the new residents locating in their neighborhoods, but not the full benefits of new entrants which accrue to the city as a whole. The result is that existing residents have an incentive to block new residents to their neighborhoods, resulting in cities that are less dense than is optimal, or too spread out. The paper models several different types of urban growth, and examines the optimal and local choice outcomes under each type. In the first model, population growth is endogenous and the physical limits of the city are fixed. The second model examines the case in which population growth in the region is given, but the city boundary is allowed to vary. We show that in both cases the city will tend to be larger and less dense than is optimal. In each, we examine the sensitivity of the model to the number of neighborhoods and to the size of infrastructure and transportation costs. Finally, we examine optimal subsidies and see how they compare to current policies such as impact fees on new development.