Layered Hodge Decomposition for Urban Transit Networks

Author(s):  
Unchitta Kan ◽  
Eduardo López
Author(s):  
Kelsey Lantz ◽  
Sakib Khan ◽  
Linh B. Ngo ◽  
Mashrur Chowdhury ◽  
Sarah Donaher ◽  
...  

Big data, collected in the form of social media posts and mobile phone location tracking, have great potential to inform and manage the planning and operation of transit networks in developing countries. Data are widely available, but the challenge, as with developed countries, is figuring out how best to use it. A case study method was used to consider approaches in Nairobi, Kenya; Istanbul, Turkey; and Dhaka, Bangladesh. In Nairobi, GPS location data were collected to generate the first map of the complex Matatu transit network. In Istanbul, automated fare collection systems were processed to understand better the usage of a bus rapid transit system. In Dhaka, researchers were collecting GPS positioning data to manage the city bus networks. Residents of these developing cities were frequent users of online media, as in many cities in the developing countries. This study revealed that integration of online media with location-based data provided a big data scenario that had the potential for supporting transit operations while posing challenges to the management of data mobility. It is not realistic to apply a one-size-fits-all approach to any problem in the developing world, but together the case studies show that with the right approach, technical capacity in transitional cities has the potential to grow to support higher-level data processing and make more efficient and more sustainable policy decisions for crucial urban transit networks in developing countries.


2010 ◽  
Vol 14 (3) ◽  
pp. 403-411 ◽  
Author(s):  
Gyeong-Sang Yoo ◽  
Dong-Kyu Kim ◽  
Kyung Soo Chon

2009 ◽  
Vol 42 (20) ◽  
pp. 246-251 ◽  
Author(s):  
Houli DUAN ◽  
Zhiheng LI ◽  
Yi ZHANG ◽  
Zuo ZHANG ◽  
Danya YAO ◽  
...  

Author(s):  
R. van Nes ◽  
P.H.L. Bovy

Stop spacing and line spacing are key design variables in urban transit-network design. They determine both the travel time and the operational costs. It is therefore essential to know what the main relationships are for these design variables. The question is, What are the optimal values for stop spacing and for line spacing in urban transit networks, given traveler preferences and supply-budget constraints? Possible objectives are discussed and analyzed using analytical models. The results of these analytical models for two typical city types are analyzed by comparing performance characteristics (i.e., travel time, operator costs, and patronage). Modeling outcomes are compared with actual data for urban transit networks in Europe. A supplemental analysis is made of the impact of considering different traveler groups. It was found that although many objectives may be formulated, only a few objectives are suitable for transit-network design. Currently applied stop spacings prove to be too short. Focusing the design to specific traveler groups might lead to a variation of stop spacing and line spacing ranging from −12 percent to +13 percent at most. Recommendations for urban transit-network design and for further research are given.


Crisis ◽  
2016 ◽  
Vol 37 (5) ◽  
pp. 377-384 ◽  
Author(s):  
Cécile Bardon ◽  
Louis-Philippe Coté ◽  
Brian L. Mishara

Abstract. Background: Suicides occur in metro systems worldwide and patterns vary in different urban transit networks. Aims: This study presents an in-depth analysis of 117 suicides in the Montreal Metro from 2000 to 2008 based on data obtained from coroners' investigations. Method: Cluster analyses were performed to identify characteristics of groups of people who kill themselves in the Montreal Metro. We also compared changes in characteristics with data from 1986 to 1995. Results: We identified five clusters of suicidal persons that describe patterns of characteristics of individuals who died by suicide in the metro that may be useful for prevention. Comparisons of suicides during 2000–2008 with data from a previous study of coroners' investigations of Montreal Metro suicides during 1986–1995 indicate changes in age, isolation, types of problems, and geographic patterns. Conclusion: Characteristics of metro suicides may be specific to localities and can change over time. Their understanding may facilitate the development of prevention strategies tailored to these different profiles.


2015 ◽  
Vol 48 ◽  
pp. 145-153 ◽  
Author(s):  
Jie Huang ◽  
David M. Levinson

2018 ◽  
Vol 57 (11) ◽  
pp. 3522-3537 ◽  
Author(s):  
Xin Guo ◽  
Jianjun Wu ◽  
Jin Zhou ◽  
Xin Yang ◽  
Desheng Wu ◽  
...  

2021 ◽  
Vol 91 ◽  
pp. 102980
Author(s):  
Malvika Dixit ◽  
Subeh Chowdhury ◽  
Oded Cats ◽  
Ties Brands ◽  
Niels van Oort ◽  
...  

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