Alexander Erath

Alexander Erath
Singapore ETH Centre · Future Cities Laboratory

Dr. sc ETH Zurich

About

70
Publications
41,687
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1,560
Citations
Additional affiliations
October 2005 - February 2011
ETH Zurich
Position
  • PhD Student

Publications

Publications (70)
Article
Road risk analysis is one of the key research areas in transport, where the impact of perceived risk on choices, especially in a dynamic setting, has been long recognised. However, due to the lack of dynamic data and the difficulty in capturing risk perception, the existing studies typically resort to static and stated approaches to infer the exper...
Article
Full-text available
With this paper, we present a novel approach for efficiently creating reality-based, high-fidelity urban 3D models for interactive VR cycling simulations. The foundation of these 3D models is accurately georeferenced street-level imagery, which can be captured using vehicle-based or portable mapping platforms. Depending on the desired type of urban...
Article
There is a need for methods that provide a better understanding of bicyclists’ perceived safety and preferences on currently unavailable and/or unknown bicycle facilities. Different survey methods have been used to study bicyclists’ behavior, experiences, and preferences; ranging from verbally described facilities to surveys including images and vi...
Article
Full-text available
The use of virtual reality (VR) in transport research offers the opportunity to collect behavioral data in a controlled dynamic setting. VR settings are useful in the context of hypothetical situations in which real-world data does not exist or in situations which involve risk and safety issues making real-world data collection infeasible. Neverthe...
Article
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Immersive technologies in transport research are gaining popularity, allowing for data collection in a controlled dynamic setting. Nonetheless, their ecological validity is still to be established hence their use in mathematical modelling in a transport setting has been scarce. We aim to fill this gap by conducting a study of cycling behaviour wher...
Article
Full-text available
Synthetic population is a key input to agent-based urban/transportation microsimulation models. The objective of population synthesis is to reproduce the underlying statistical properties of real population based on available microsamples and marginal distributions. However, characterizing the joint associations among a large set of attributes is c...
Conference Paper
Full-text available
This study investigates the combination immersive virtual reality (VR) and an instrumented cycling simulator for in-depth behavioral studies of cyclists. To this end, a cycling simulator was developed, virtual environments resembling Singapore were created, combined with the output of a traffic microsimulation. This set-up was created with the specifi...
Article
Full-text available
Location-based social network data offers the promise of collecting the data from a large base of users over a longer span of time at negligible cost. While several studies have applied social network data to activity and mobility analysis, a comparison with travel diaries and general statistics has been lacking. In this paper, we analysed geo-refe...
Article
New Big Data sources such as mobile phone call data records, smart card data and geo-coded social media records allow to observe and understand mobility behaviour on an unprecedented level of detail. Despite the availability of such new Big Data sources, transport demand models used in planning practice still, almost exclusively, are based on conve...
Article
Full-text available
The indexes for walkability proposed so far refer generally to the closest amenities and public transport stops and the existing network structure. The weights of the attributes do not reflect the independently measured preferences of the users and residents. Design attributes such as the location and type of crossings and walkway design features a...
Article
Full-text available
The estimation of differences in the value of in-vehicle time sitting and standing is usually made with stated choice (SC) data, partly due to the lack of revealed preference data. In this paper, we use the observed behaviour of a subset of metro users in Singapore, who are willing to travel a longer time (into the opposite direction or backwards)...
Conference Paper
Full-text available
This study investigates the role of built environment and accessibility on vehicle ownership and usage in Switzerland. To characterize the urban structure we make a distinction between micro- accessibility and macro-accessibility. Micro-accessibility is derived from an extensive online points of interest database and the walking time to these desti...
Technical Report
The indices for walkability proposed so far are mostly ad-hoc and refer generally to the closest amenities/public transport stops and the existing network structure. They are ad-hoc as the weights of the attributes are generally arbitrary and do not reflect the independently measured preferences of pedestrians. Furthermore, they do not include desi...
Article
Destination choice models can be embedded in transport and land use models to understand travel and location choice behavior and to forecast scenarios. Utility-maximizing destination choice models can account for individual behavior and make them suitable for agent-based models, while processing destination capacities is also in line with agentbase...
Research
Full-text available
Location-based social network data offers the promise of collecting the data from a large base of users over a longer span of time at negligible costs. While several studies have applied social network data to activity and mobility analysis a comparison with travel diaries and general statistics is lacking. In this paper we analyze geo-referenced T...
Conference Paper
Full-text available
Traditionally, transport models describe passenger flows by combining travel diary data with population statistics as structural data such as the distribution of jobs and other activity opportunities. However, passively collected data such as public transport smart card data allow to identify travel patterns of individuals at high temporal and spat...
Conference Paper
Full-text available
Innovations in communication and vehicle technology will continue to radically impact urban mobility. In particular, personalised mobility services and autonomous vehicles will change the way how we travel. But it also raises a series of challenges for transport planning and policy making. In this talk, I will highlight why agent-based transport si...
Article
Full-text available
Origin-destination (OD) pattern is a highly useful means for transportation research since it summarizes urban dynamics and human mobility. However, existing visual analytics are insufficient for certain OD analytical tasks needed in transport research. For example, transport researchers are interested in path-related movements across congested roa...
Conference Paper
Full-text available
Agent-based micro-simulation models require a complete list of agents with detailed demographic/socioeconomic information for the purpose of behavior modeling and simulation. This paper introduces a new alternative for population synthesis based on Bayesian networks. A Bayesian network is a graphical representation of a joint probability distributi...
Article
Full-text available
In this paper, we connect two notions of accessibility that are more often than not considered separately: pedestrian accessibility and transit accessibility. We move away from the notion of zonal accessibility and measure fine-grained accessibility using door-to-door travel times. Two pedestrian networks are compared to a baseline scenario conside...
Conference Paper
Full-text available
Location-based social network data offers the promise of collecting the data from a large base of users over a longer span of time at negligible costs. While several studies have applied social network data to activity and mobility analysis a comparison with travel diaries and general statistics is lacking. In this paper we analyze geo-referenced T...
Article
Full-text available
A recent approach for generating populations of synthetic individuals through simulation is extended to produce households of grouped individuals. The contingency tables of the generated populations match external controls on the individual and household levels while exhibiting far greater variety in composition than existing approaches can offer....
Article
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Public transportation systems (PTSs) play an important role in modern cities, providing shared/massive transportation services that are essential for the general public. However, due to their increasing complexity, designing effective methods to visualize and explore PTS is highly challenging. Most existing techniques employ network visualization m...
Article
The number and the temporal and spatial distribution of work locations are crucial information for any transport demand model. To generate the initial transport demand of MATSim, an activity-based multiagent simulation framework, it is necessary to determine dynamic workplace capacities with high spatial resolution, either on a parcel or even a bui...
Conference Paper
With the progress in transport demand modelling from aggregated, static and zone-based assignment models to fully dynamic agent- and activity-based transport simulations, the scope of data that needs to be collected, managed and maintained has changed dramatically. Furthermore, the type of analyses as well as potential analysts have changed. Wherea...
Article
Mass rapid transit systems (MRT) have become the most important public transport mode in many major cities globally, given its advantages in larger capacity, faster velocity and higher reliability compared with other modes. Hence, various projects directed to improve service quality of MRT systems by optimizing operation strategies have been conduc...
Article
In this paper a new model of fleet choice for households uses the multiple discrete-continuous extreme value (MDCEV) model as a framework. The aim is to establish a model to allocate car types to activity-based microscopic agent-based transport simulations. What is new in the presented model is that choice is influenced by fuel price in addition to...
Conference Paper
Full-text available
Rapid tranit systems are the most important public transportation service modes in many large cities around the world. Hence, its service reliability is of high importance for government and transit agencies. Despite taking all the necessary precautions, disruptions cannot be entirely prevented but what transit agencies can do is to prepare to resp...
Article
A map-matching approach is presented that combines public bus routes information (sequences of consecutive stop locations and sequences of geo-referenced points) with a high resolution network. It is especially designed to account for a) low temporal resolution of geo-referenced points and b) to allow that a stop which is served by several lines is...
Article
This paper summarises the results of an extensive stated preference (SP) survey, conducted in Switzerland in order to obtain detailed information for the evaluation of road pricing schemes. Four different SP experiments were included: one about the political acceptability of road pric- ing and the other three about route, mode and departure time ch...
Article
Full-text available
ABSTRACT This paper presents a new application of the stated adaption survey method,to analyze long 6 term reactions to substantial changes in transport costs including different transport related 7 energy-efficiency measures. Such long term reactions include: 8 choice of car type, motorization and usage, 9 choice of public transport season cards a...
Article
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This paper presents a methodology that incorporates vulnerability to natural hazards into current infrastructure management systems. The paper is mainly concerned with presenting the methodology applied to assess the transport-related consequences of link failures, including congestion effects on a networkwide scale. Four possible demand shifts cau...
Article
Full-text available
Recent research of complex networks has significantly contributed to the understanding how networks can be classified according to its topological characteristics. However, transport networks attracted less attention although their importance to economy and daily life. In this work the development of the Swiss road and railway network during the ye...
Article
Full-text available
Reliable measures of the valuation of travel time savings (VTTS) are a crucial input into policy planning in any regional or national context. However, the evidence from secondary or parallel VTTS studies often differs from those of official or national studies. In this paper, we present evidence from a study aimed at merging evidence from four sep...
Article
The Swiss study of the value of travel time savings (VTTS), conducted by König, Axhausen und Abay (2004) reported unexpectedly high values for shopping trips from early experimental stated preference experiments, which were finally not included in the main study. Therefore a study focusing only shopping travel was conducted to see, if these results...
Article
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1 Abstract This paper presents a methodology,to assess link failure induced transportation related conse-
Article
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This paper analyzes how residence location choice is influenced by substantial changes in trans- port costs in Switzerland. Given different price regimes, a stated preference experiment com- bined two residence location situations and corresponding mobility tools as selected by the respondent in a prior stated adaption experiment. Overall, the resu...
Article
Full-text available
Reliable measures of the valuation of travel time savings (VTTS) are a crucial input into policy planning in any regional or national context. How- ever, the evidence from secondary or parallel VTTS studies often diers from those of ocial or national studies. In this paper, we present evidence from a study aimed at merging evidence from four separa...
Article
Full-text available
This paper presents hedonic regressions for the Singaporean residential real-estate market. To these means, asking prices were collected from an online commercial property portal in February 2011. Transaction prices were collected from governmental data sets. These data sets are enhanced with locational data, such as vicinity to bus stops, MRT stat...
Article
Full-text available
Electronic payment systems for public transport, introduced in many cities all over the world during the last decade, are able to capture system transactions and provide comprehensive data records on usage of public transport. Processing and analysis of this data opens new opportunities in transportation and travel behaviour research and is becomin...
Article
Full-text available
This paper presents an overview of the research of the module Mobility and Transportation, one out of nine modules of the Future Cities Laboratory (FCL), the first interdisciplinary research group of the Singapore-ETH Center for Global Environmental Sustainability (SEC). The aim of the module is to advance research into the complexity of land trans...
Article
Over the past twenty years, numerous infrastructure management systems have been developed to address gradual failure modes. Unfortunately the management of sudden failure modes within large infrastructure systems (principally: natural hazard induced failures) have not been systematically addressed. This is particularly an issue within liberalized...

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