SOLVING A THREE-DIMENSIONAL URBAN ACTIVITY MODEL OF LAND USE INTENSITY AND TRANSPORT CONGESTION*

ABSTRACT Recent developments in combining input-output and transportation planning models have made it possible to construct realistic comprehensive urban and regional activity models of land use intensity. These models form the basis for a rigorous approach to studying the interactions among urban activities. However, efficient computational solution methods for implementing such comprehensive models are still not available. In this paper, an efficient solution method for a nonlinear programming urban systems model is developed by combining Evans's partial linearization technique with Powell's hybrid method. The solution algorithm is applied to a small but realistic urban area with a detailed transportation network.     

南京城市轨道交通建设潜在影响下的土地利用分异研究

选取南京轨道交通沿线土地利用状态作为研究对象,针对南京轨道交通建设的发展背景和特点,通过GIS和RS技术,建立南京市中心城区的土地利用、交通等综合数据库,运用"廊道效应"方法,研究轨道交通沿线的土地利用分异情况,探讨轨道交通建设对城市土地利用空间分异的潜在影响。结果表明:居住用地已经表现出明显的廊道效应,从轨道交通线中心圈层向外逐步递减;而公共设施用地和工业用地则表现不明显。基于以上结果,从空间角度研究轨道交通线路与沿线土地利用的相互关系,提出有利于南京轨道交通建设与高强度土地开发相结合的联合开发模式。     

广州市高峰小时居住用地交通产生与分布——基于出租车GPS起讫关联的分析

本文以广州为案例,通过通勤高峰期间出租车GPS数据的时空挖掘,分析基于GPS起讫关联的居住地交通产生与分布特征,并讨论其所隐含的城市职住空间关系及在交通需求分析中的潜在价值。研究发现居住用地交通产生的出行距离存在ZIPF法则所表现的衰减规律,到达工业、商业金融和公共服务等用地的距离依次降低,而空间上距离呈中心城区向郊区增加的同心环模式。此外,本文还尝试从交通模型参数设定、职-住关系等方面探讨本文研究的应用方向。     

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.     

SEARCH FRICTIONS,UNEMPLOYMENT, AND HOUSING IN CITIES: THEORY AND POLICIES

We propose an urban search‐matching model with land development. Wages, unemployment, prices of housing and land are endogenously determined. We characterize the steady‐state equilibrium and then discuss the issue of efficiency. To explore interactions among markets, we implement comparative static analysis. We also consider three policies: an entry‐cost policy that reduces firms' entry, a transportation policy that reduces commuting costs, and a housing policy that decreases rental prices. We find that the transportation and housing policies are more efficient if the unemployment rate is low, while the entry‐cost policy is more efficient if the unemployment rate is high.     

Smart growth strategies,transportation and urban sprawl: simulated futures for Hamilton,Ontario

North American cities have undergone dramatic changes over the last century. Locations that were once inconvenient have become accessible through extensive road networks leading to population decentralization from the traditional urban centre to suburbia, creating polycentric sprawls from once monocentric communities. Hamilton, Ontario is one such city. The decentralization and urban decline of the city is widely attributed to sprawling development. This change in the sociospatial structure creates challenges for transportation planners as we see greater automobile dependency, greater commuting distances and increased congestion. Smart growth policies such as urban residential intensification (URI) aim to increase population densities in the urban core. This exploratory study estimates the benefits of such policies from a transportation aspect. It is predicted that the City of Hamilton will experience household growth of approximately 80,000 households over the period 2005–2031. Using IMULATE, an integrated urban transportation and land‐use model, a variety of development scenarios model this anticipated growth. Changes in vehicular emissions, traffic congestion and energy consumption as a result of URI are examined. Models of the land‐use/transportation relationship demonstrate how increasing population densities within a city's urban centre drastically reduce congestion, emissions and gasoline consumption.     

Using Linear Integer Programming for Multi‐Site Land‐Use Allocation

Research in the area of spatial decision support (SDS) and resource allocation has recently generated increased attention for integrating optimization techniques with GIS. In this paper we address the use of spatial optimization techniques for solving multi‐site land‐use allocation (MLUA) problems, where MLUA refers to the optimal allocation of multiple sites of different land uses to an area. We solve an MLUA problem using four different integer programs (IP), of which three are linear integer programs. The IPs are formulated for a raster‐based GIS environment and are designed to minimize development costs and to maximize compactness of the allocated land use. The preference for either minimizing costs or maximizing compactness has been made operational by including a weighting factor. The IPs are evaluated on their speed and their efficacy for handling large databases. All four IPs yielded the optimal solution within a reasonable amount of time, for an area of 8 × 8 cells. The fastest model was successfully applied to a case study involving an area of 30 × 30 cells. The case study demonstrates the practical use of linear IPs for spatial decision support issues.     

基于城市土地利用模式与交通模式互动机制的大城市可持续交通模式选择--以广州为例

城市土地利用模式与交通模式间客观存在互动机制,土地利用模式是交通模式形成的基础,交通模式的选择将会改变土地利用模式,因此土地利用模式特征是影响城市可持续交通模式选择的至关因素。本文在全面分析广州城市土地利用模式特征基础上,综合考虑汽车产业政策、能源及环境等影响因素提出了广州可持续交通模式:公共交通优先,小汽车、自行车适度发展,交通方式合理分工的高效化、节能化和环保化绿色交通模式。     

A Study of the Shapes of Economic Phenomena for the Purpose of Elaborating More Rational Techniques for the Opening up of Tayga Territories

Starting from the premise that “shape is an important [spatial] property” (Bunge), the author analyzes the optimal shapes and dimensions of fragmented plots of arable land typical of Yakutia and other parts of the forest zone of the USSR. The optimal shape of an arable plot in a forest clearing is found to be an elongated piece of land of about 200–250 meters by 750–1500 meters and an area of 15 to 30 hectares. A program of land consolidation in the last decade has aimed at the elimination of excessively small plots and the expansion of mean plot size within the limitations of the Yakutian environment, where the presence of ground ice and thermokarst conditions produces a complex system of thaw depressions impeding the development of agriculture.     

京津冀交通路网结构特征及其演变的分形刻画

交通一体化是京津冀协同发展的基础和前提，合理的交通网络结构对提升城市群整体效能意义重大。本文基于1995-2030年多源交通路网数据，运用分形思想，研究京津冀以城市群为节点体系的交通路网空间结构特征及演化趋势。主要结论如下：①京津冀高等级路网仍有一定扩展潜力，交通网络整体等级结构尚不稳定，未达到一种优化的分形递阶状态。②各级路网空间分布具有自仿射特征，但各向异性扩展强度正在逐渐减弱，城镇化和交通一体化战略的实施正在促进各级路网逐渐向自相似的结构一体化方向演化。③交通路网空间结构演化与城镇用地结构不同步，可能与系统所处城镇化发展阶段有关。④高等级路网分维演化服从次数大于1的logistic模型，按照规划预期，各级路网空间发育将相继在2040年前后达到饱和；但按照规划设计高速公路建设将过度饱和，未来应及时调整规划。     

基于TOD策略的旅游新区公共交通系统规划方法——以阳宗海风景区为例

公共交通系统是旅游新区建设与发展的重要交通保障,科学的公共交通系统规划能够充分满足游客与内部居民的出行需求,并引导旅游新区空间布局的良性发展。为实现旅游新区交通的可持续发展与区域景点间的和谐互动,分析了旅游新区公共交通系统的发展需求。将TOD理念引入旅游新区公共交通系统规划,从现状调查、需求分析、方案设计、方案评价与方案实施等具体层面,设计了基于TOD策略的旅游新区公共交通系统规划流程。以昆明阳宗海风景名胜区为实例,在区域公共交通现状与公共交通需求分析的基础上,结合区域发展目标详细探讨了公交系统的规划模式,并对公交规划方案进行了评估。结果表明:基于TOD策略的旅游新区公共交通系统规划方法能够支持旅游新区用地布局和旅游业发展,并提高旅游新区公共交通系统出行的便捷性、舒适性和满意度。     

Exile in a Land of Exiles: The Early History of Criminal Transportation Law in New South Wales, 1788–1809

This article considers the peculiar application of English criminal transportation law in the ‘convict colony’ of New South Wales during its foundation years. It demonstrates, first, that transportation was not intended to be within the sentencing jurisdiction of the New South Wales Court, but that it was adopted and practised nonetheless, with confused and incongruous results. In particular, substantial challenges emerged in applying colonial or local sentences to a population that was largely already under sentence of transportation. The result was a raft of innovations and inconsistencies that highlighted the legal and practical problems of performing exile in a land of exiles.     

河谷型城市兰州中心城区人口规模初步研究

人口容量规模是城市发展的战略性议题,尤其河谷型城市。基于用地空间、水资源及生态环境三个主要影响因素,对河谷型城市人口容量规模的测算途径和方法进行了探讨和总结。以典型河谷型城市兰州中心城区为例,估算了其在该三个因素下的各自适宜人口规模和最大人口规模,进而反映出河谷用地空间对中心城区人口规模的限制作用较水资源及生态环境更为强烈,并根据木桶原理最短边,得出现有条件下适宜人口规模为230.56万、最大人口规模为342.17万的基本结论。     

RESEARCH IN PROGRESS IN SCANDINAVIA

The authors quantitatively analyze the effect of railroad construction on agricultural land values in the often overlooked, agriculturally oriented, trans-Mississippi West. This region is unique in American history in that, at the end of the nineteenth century, the railroad itself preceded widespread settlement. Using a hedonic model, they show that railroad transport increased agricultural land values in this region by more than 20 percent, which had a larger impact than recent studies have found for other regions. Moreover, the authors found that the addition of a railroad to a county significantly increased its growth in land values. This finding is contrary to that of existing studies. Finally, the authors show statistically that the railroad and land values were not endogenously determined, lending credibility to the causality of the results presented in their hedonic and growth models. These results indicate a valuable alternative approach to use in the historical analysis of transportation infrastructure and its impact on land prices.     

Dealing with globalisation at the regional and local level: the case of contemporary containerization

This paper considers the challenges that ocean container companies face in developing global operations in the ocean and land realms. The recent horizontal and vertical integration of the ocean carriers and the subsequent formation of global networks have taken place for the transport of goods at sea. Conformity in operations is to be expected in the globalisation process; however, there is less conformity of operations on land. The cooperation strategies at sea appear to break down when the goods reach the port. Each shipping company has its own network of agents and agreements with shippers, freight forwarders or land transportation companies to handle goods on land. Each also has varying logistics provision abilities. Moreover, the land areas vary according to simple geography, economic development, transport infrastructure and institutional constraints. Of these differences, we suggest that institutional constraints create the greatest challenge to the ocean carriers adopting a universal land strategy to service their customers. The paper focuses on three major areas for containerisation—East Asia, Northwest Europe and North America—and draws on interviews conducted with shipping industry executives in Norfolk (Va.), Rotterdam, Le Havre, Hong Kong and Singapore. The paper ends with a look at the land operations of Maersk Sealand as an example of a company with varying capabilities and strategies for the landward transport of containers.     

HETEROGENEOUS TASTES AND RESIDENTIAL LOCATION*

ABSTRACT. In a simple urban model, where the only spatial distinction made is between center and suburb, we introduce a uniform distribution of preferences for land. Under a logarithmic utility function, we examine how the location and consumption decisions of individuals differ in consequence of their different preferences for land. Comparative statics indicate that the qualitative response of the city at equilibrium to changes in per capita income and transportation cost is not affected by the introduction of such heterogeneity. Possible extensions are also briefly discussed.     

Accessibility Measurement in Transportation Networks and Application to the Seoul Bus System

This study presents an algorithm for measuring the time‐distance accessibility based on the flow data of actual transportation networks and examines resulting accessibility distributions. Specifically, we construct an extended graph of the transportation network to take into account not only the average speed and transfer time extracted from the data set but also various possible trajectories taken via transfers. Employing the modified Floyd algorithm which finds the shortest time distance, we compute the time‐distance accessibility of every bus stop in the Seoul bus system, which yields distinctive skew distributions. We then introduce a time‐distance cutoff to focus on effective connections and probe the emergent spatial distributions as the cutoff is varied. Revealed are the characteristic scales as well as spatial structures of the system. It is suggested that the time‐distance accessibility can serve as a significant measure to describe and predict the urban land use pattern.     

港口经济及其地域空间作用:对鹿特丹港的案例研究

港口经济在国民经济中起着越来越重要的作用,面临全球化竞争的挑战,借鉴国外港口经济的经验对我国三角洲地区和海港城市的发展具有重要意义。本文将分析荷兰鹿特丹港的港口经济发展,研究港口产业对于港口地区的社会经济带动作用,港口产业的时间演替规律和在港口产业带动下的港口地区地域空间扩展规律。     

An Evolutionary Algorithm for Site Search Problems

The goal of solving a site search problem is to allocate a contiguous set of land parcels such that the total land acquisition cost, or other objectives, are optimized. This article describes the design and implementation of an evolutionary algorithm (EA) that can be used to solve site search problems. In this article, a graph representation is used to define the spatial structure of solutions to the problem. By using this representation, the contiguity of a site is maintained during the initialization, mutation, and local search operations of the EA. The effectiveness of the EA in finding optimal or near-optimal solutions is demonstrated by testing it on a series of problems whose optimal solutions are known.     

大城市交通可持续发展动力机制及优化决策模型探讨

大城市交通是一个多级双向控制系统,本文首先提出城市交通可持续发展的目标,探讨了城市交通可持续发展的动力机制,然后以可靠度作为解藕参数,以成本作为协调参数,构造了大城市交通可持续发展的分级优化决策模型,并对北京市2015年交通结构进行了优化决策模拟。最后,提出了我国大城市交通可持续发展的对策建议。