Measuring Space-Time Accessibility Benefits within Transportation Networks: Basic Theory and Computational Procedures

Accessibility is a fundamental but often neglected concept in transportation analysis and planning. Three complementary views of accessibility have evolved in the literature. The first is the constraints-oriented approach, best implemented by Hägerstrand's space-time prisms. The second perspective follows a spatial interaction framework and derives “attraction-accessibility measures” that compare destinations' attractiveness with the travel costs required. A third approach measures the benefit provided to individuals by the transportation/land-use system. This paper reconciles the three complementary approaches by deriving space-time accessibility and benefit measures that are consistent with the rigorous Weibull axiomatic framework for accessibility measures. This research also develops computational procedures for calculating these measures within network structures. This provides realistic accessibility measures that reflect the locations, distances, and travel velocities allowed by an urban transportation network. Since their computational burdens are reasonable, they can be applied at the urban scale using a GIS.     

Measuring Space-Time Accessibility Benefits within Transportation Networks: Basic Theory and Computational Procedures

Accessibility is a fundamental but often neglected concept in transportation analysis and planning. Three complementary views of accessibility have evolved in the literature. The first is the constraints-oriented approach, best implemented by Hägerstrand's space-time prisms. The second perspective follows a spatial interaction framework and derives “attraction-accessibility measures” that compare destinations' attractiveness with the travel costs required. A third approach measures the benefit provided to individuals by the transportation/land-use system. This paper reconciles the three complementary approaches by deriving space-time accessibility and benefit measures that are consistent with the rigorous Weibull axiomatic framework for accessibility measures. This research also develops computational procedures for calculating these measures within network structures. This provides realistic accessibility measures that reflect the locations, distances, and travel velocities allowed by an urban transportation network. Since their computational burdens are reasonable, they can be applied at the urban scale using a GIS.     

HISTORIOMETRICS,HISTORICAL AND CARTOGRAPHIC INFORMATION,AND COMPUTERS

Abstract

Accessibility is frequently used in transportation planning to measure the efficiency of new infrastructure in terms of travel time and population served. In this article, the authors apply accessibility concepts based on the geo-historical angle. The aim of this study is to investigate the relationships between population dynamics and the railway expansion from 1830 to 1930. Their approach considers a local scale composed of some 36,000 French communes for the demographic data and more than 28,000 kilometers for the railway network. The methodological framework of this database is based on historical geographic information systems completed by anamorphosis analysis. In this way, they are able to map the changing contours of accessibility from the local to the regional and national scales for historical time.     

乡村地区路网通达性研究——以陕西省丹凤县为例

通达性是指交通网络中各节点相互作用的机会大小,也是从出发地前往目的地的方便程度。道路网络是支撑乡村地区经济社会发展的基础,而通达性则是反映道路网络水平和质量的有效评价指标。本文以位于陕西秦巴山区的丹凤县为例,基于第二次土地利用现状调查和实际考察资料,分别以乡镇和行政村为单元,以GIS方法为支撑,采用道路临近性、乡镇内部可达性和道路衔接性三项指标,分析和评价了丹凤县乡村地区路网通达性。本研究对陕南秦巴山区乡村路网建设和移民搬迁工程有一定指导作用,对乡村地区路网通达性分析和评价方法进行了有效改进。     

PROPERTY LEFT BEHIND: AN UNINTENDED CONSEQUENCE OF A NO CHILD LEFT BEHIND “FAILING” SCHOOL DESIGNATION

Under the No Child Left Behind Act (NCLB), schools receiving Title I funding that fail to meet adequate academic performance targets for two consecutive years are deemed “failing.” This broadly defined, but often misunderstood designation has exerted a negative and unintended effect on low‐income neighborhoods—the same neighborhoods NCLB was originally intended to help. Specifically, we find that “failing” designations significantly decrease home prices. This property value response is observed even after controlling for a myriad of traditional test score measures and school‐level student demographics. Additional analyses suggest that this home price effect is largely due to strong perceptions of poor school quality or social stigma surrounding a “failing” designation.     

北京城市保障性住房居民的就医可达性研究——基于GIS网络分析方法

本文以北京市为例,采用GIS 网络分析方法,分析具有中低收入群体特征、居住在保障性住房居民通过公共交通和私家车方式,到达各类医疗设施的就医可达性。分析结果显示：从出行方式来看,采取私家车出行的就医可达性高于公共交通。从就医可达性的医院等级来看,三级医院的可达性明显低于社区医院。从就医可达性的空间分布来看,位于城市中心、北部和东部地区的保障性住房居民,其可达性相对较好;位于城市高速路沿线的保障性住房汽车出行可达性较高、但公共交通可达性相对较差。从就医可达性的时间上看,建设年代偏后的保障性住房就医可达性差。通过这些分析发现,居住在保障性住房、选择公共交通的保障性住房居民的就医出行更加不方便。     

Estimating Antebellum Passenger Costs: A Hub-and-Spoke Approach

Abstract

Over 30,000 miles of railroad and 4,000 miles of canals were constructed in the United States between 1815 and 1861. However, the lack of data has prevented the study of this “transportation revolution” for most cities. This article thus enables a closer study of antebellum travel improvements by constructing a hub-and-spoke network that is capable of estimating the cost of passenger travel from New York City and Philadelphia to any U.S. city in 1836, 1850, 1856, 1859, and 1867. The semi-parametric approach provides an accurate cost estimate by using available historical information to determine the travel cost to all other cities.     

3. “PRESENCE” AND MYTH

There are no dictionary meanings or authoritative discussions of “presence” that fix the significance of this word in a way that ought to be accepted by anybody using it. So we are in the welcome possession of great freedom to maneuver when using the term. In fact, the only feasible requirement for its use is that it should maximally contribute to our understanding of the humanities. When trying to satisfy this requirement I shall relate “presence” to representation. Then I focus on a variant of representation in which the past is allowed to travel to the present as a kind of “stowaway” (Runia), so that the past is literally “present” in historical representation. I appeal to Runia's notion of so‐called “parallel processes” for an analysis of this variant of historical representation.     

Feminism from the Margin: Challenging the Paris/Banlieues Divide

This paper aims to cast light on specifically French constructions of gender, citizenship and nationhood and articulate two bodies of work, one dealing with political mobilizations of racialized minorities in the French context, and the other dealing with gender concerns in urban policy. Emerging social movements in the urban area of Paris are having to take position in a context in which a normative “state feminism” is being used to stigmatize working‐class neighbourhoods in the banlieues as well as their male inhabitants. This paper considers the “double bind” in which feminist activists, and women more generally, find themselves as a result. It argues that some formerly silenced groups are being granted space for expression by the current foregrounding of “women” in urban policy. Drawing on bell hooks' insights on the margin/centre tension in feminist theory as a useful way of thinking about the spatial dimension of these issues, the paper looks at one group in particular that defines itself and its strategies in spatial terms.     

NEITHER/NOR

An Atheism that is Not Humanist Emerges in French Thought examines the advent of antihumanism as a cultural figure out of a network of intellectual crises in interwar and postwar France and ties this advent to the more general consequences of secularization in the modern age. Bracketing political judgments, and eschewing dialectical methods, Stefanos Geroulanos shows how the critique of humanism that emerged from disparate quarters of French intellectual life resulted in a series of negative positions that rendered the human void of any conceptual content and thereby unsuitable as a basis for future political action or philosophical investigation. In addition to basing his analysis on two rigorously sketched concepts of his own design, “antifoundational realism” and “negative anthropology,” Geroulanos deploys a striking use of conceptual irony to show how the critical efforts of his protagonists often led to theoretical cul‐de‐sacs and a heightened measure of existential despondency. The treatment of the emergence of antihumanism as a local phenomenon among a segment of French intellectuals nevertheless encounters problems when it abandons the terrain of historical argument for an engagement with broader metaphysical concerns. By participating in the discourse of its subjects, An Atheism that is Not Humanist finds its way into cul‐de‐sacs of its own, in which, for example, the ostensibly political bearing of efforts to transcend mere politics for broader considerations of the “theo‐political crisis of modernity” remains unclear. Finally, by accepting the terms of the phenomenological diagnosis of metaphysical crisis in the interwar years, the book compromises certain of its genealogical aspirations, especially with regard to the legacy of Third Republic idealism and the specific qualities of post‐phenomenological structuralism.     

A Play of Three Suitors: A Neglected Middle Dutch Version of the “Entrapped Suitors” Story (ATU 1730)

The wide diffusion of the “Entrapped Suitors” story-type has often been observed: examples are found in a remarkable number of literatures, ranging from English, French and Greek in the West, to Persian, Arabic and Kashmiri in the East. However, a text of this type that is often overlooked is the Middle Dutch play Een Speel Van Drie Minners (“A Play of Three Suitors”). This is despite the fact that it represents a highly idiosyncratic variation on the story, as it replaces the central moral with something more scabrous. We offer here a comprehensive discussion of this singular text and its narrative form, with an English verse-translation appended.     

Disciplined Mobility and the Emotional Subject in Royal Dutch Lloyd's Early Twentieth Century Passenger Shipping Network

This paper examines the disciplined mobility and emotional geographies of “between‐deck” passengers in Royal Dutch Lloyd's early Twentieth Century passenger shipping network. Specifically, it is concerned with the ways in which the network was established and with the efforts made to maintain it. It is found that such a disciplinary network furthers the firm's goal of shipping healthy and productive bodies for corporate profits and that transhipment facility Lloyd Hotel in Amsterdam was integral to the performance and maintenance of such a transnational disciplinary network. The key consequence of such disciplined mobility was the creation of an emotional passenger‐migrant subject shaped in relation to the power of corporate, cultural and other authorities in maritime travel and migration. In identifying this historic network of disciplined mobility and its emotional subject, this paper seeks to reveal the emotional geographies relating to mobile subjectivities and the power relations associated with their historically significant travels.     

In Defence of the Secular? Islamisation,Christians and (New) Politics in Urbane Malaysia

Besides the clarion call for a “new politics” by opposition political parties, a significant catalyst that arguably swayed Christian electoral choices in the landmark Malaysian general elections of March 2008 was the counsel by religious leaders to safeguard “the secular state”. This action was prompted by recent high profile controversial legal cases that were perceived to be a serious erosion of the freedom of religion clause guaranteed in the secularist Federal Constitution. In this essay, I not only examine the recent antecedents of this course of action but also delve into the more distant past in order to draw out how the apparently impervious categories of “religion” and “the secular” have been implicated in the structuring of social and political imaginaries in Malaysia.     

A Little Knowledge Is a Dangerous Thing: What We Know about the Role of the Media in State Politics

Abstract

This article explores the intellectual itinerary of the contemporary French political philosopher Pierre Manent. In particular, it highlights his efforts to do justice to the three great “poles” of human existence: philosophy, politics, and religion. Manent is shown to be a philosophically minded Christian, one who thinks politically and who rejects the temptation to “despise the temporal order.” Manent's reservations about the European project in its present form are shown to be rooted in a understanding of politics that emphasizes the need to weave together “communion” and “consent” if Europeans are to avoid administrative despotism and those postpolitical fantasies that prevent them from thinking and acting politically. The article ends with a reflection on Manent's impressive history of “political forms” in the Western world.     

Space-Time and Integral Measures of Individual Accessibility: A Comparative Analysis Using a Point-based Framework

Conventional integral measures of accessibility, although valuable as indicators of place accessibility, have several limitations when used to evaluate individual accessibility. Two alternatives for overcoming some of the difficulties involved are explored in this study. One is to adapt these measures for evaluating individual accessibility using a disaggregate, nonzonal approach. The other is to develop different types of measures based on an alternative conceptual framework. To pursue the former alternative, this study specifies and examines eighteen gravity-type and cumulative-opportunity accessibility measures using a point-based spatial framework. For the latter option, twelve space-time accessibility measures are developed based on the construct of a prism-constrained feasible opportunity set. This paper compares the relationships and spatial patterns of these thirty measures using network-based GIS procedures. Travel diary data collected in Columbus, Ohio, and a digital data set of 10,727 selected land parcels are used for all computation. Results of this study indicate that space-time and integral indices are distinctive types of accessibility measures which reflect different dimensions of the accessibility experience of individuals. Since space-time measures are more capable of capturing interpersonal differences, especially the effect of space-time constraints, they are more “gender sensitive” and helpful for unraveling gender/ethnic differences in accessibility. An important methodological implication is that whether accessibility is observed to be important or different between individuals depends heavily on whether the measure used is capable of revealing the kind of differences the analyst intends to observe.     

Individual Accessibility Revisited: Implications for Geographical Analysis in the Twenty‐first Century

Analytical methods for evaluating accessibility have been based on a spatial logic through which the impedance of distance shapes mobility and urban form through processes of locational and travel decision making. These methods are not suitable for understanding individual experiences because of recent changes in the processes underlying contemporary urbanism and the increasing importance of information and communications technologies (ICTs) in people's daily lives. In this paper we argue that analysis of individual accessibility can no longer ignore the complexities and opportunities brought forth by these changes. Further, we argue that the effect of distance on the spatial structure of contemporary cities and human spatial behavior has become much more complicated than what has been conceived in conventional urban models and concepts of accessibility. We suggest that the methods and measures formulated around the mid‐twentieth century are becoming increasingly inadequate for grappling with the complex relationships among urban form, mobility, and individual accessibility. We consider some new possibilities for modeling individual accessibility and their implications for geographical analysis in the twenty‐first century.     

基于GIS的县级尺度交通可达性研究——以陕西省为例

本文以陕西省为例,采用加权平均出行时间指标,对县级尺度的到区内节点、火车站、主要干线公路和机场的交通可达性分别进行了评价,结果表明:陕北的东北部、西北部,陕南的东南部各方面交通可达性表现都很差,西安及周围临近县市各方面则表现良好。通过对到区内节点可达性和三种方式的区外交通可达性加权求和得出的区域交通可达性进行的研究表明,陕西形成了以西安与其周围临近县市组成的片状可达性低值区,可达性良好;陕北的大部分及陕南的南部可达性差;陕西省整体可达性分布不均衡。陕西省今后交通建设的重点应是提高区域交通可达性的均衡性。     

Space–Time Accessibility Under Conditions of Uncertain Travel Times: Theory and Numerical Simulations

Recently, several accessibility measures using the space–time prism concept have been suggested in the literature. These measures fail to take into account (i) the ability of individuals to adjust their activity–travel patterns in coping with constrained choice sets, (ii) uncertainty in the perception of travel times, (iii) temporal variability of travel times, and (iv) the influence of travel information on accessibility. The aim of the present article is to contribute to this literature by addressing these four shortcomings. Theory will be developed and illustrated using numerical simulations. The results suggest that the accessibility measure proposed in this article is a useful indicator of social inclusion in terms of the time individuals can spend to conduct their preferred activities. Moreover, accessibility is found to be affected by the presence of schedule delay penalties, restrictions in time allocation to activities, and the provision of travel time information in order to reduce uncertainty.