Real-time public transit info on your smartphone is reassuring, but does it save waiting time? We benchmark it using a year’s worth of real-time bus location data and discover – not really.
Liu, L. and Miller, H.J. (2020) “Does real-time transit information reduce waiting time? An empirical analysis,” Transportation Research A, 141, 167-179.
New publication: Jaegal Y, Miller HJ. (2019) Measuring the structural similarity of network time prisms using temporal signatures with graph indices. Transactions in GIS. 00:1–24. https ://doi.org/10.1111/tgis.12582
Abstract. The network‐time prism (NTP) is an extension of the space‐time prism that provides a realistic model of the potential pattern of moving objects in transportation networks. Measuring the similarity among NTPs can be useful for clustering, aggregating, and querying potential mobility patterns. Despite its practical importance, however, there has been little attention given to similarity measures for NTPs. In this research, we develop and evaluate a methodology for measuring the structural similarity between NTPs using the temporal signature approach. The approach extracts the one‐dimensional temporal signature of a selected property of NTPs and applies existing path similarity measures to the signatures. Graph‐theoretic indices play an essential role in summarizing the structural properties of NTPs at each moment. Two extensive simulation experiments demonstrate the feasibility of the approach and compare the performance of graph indices for measuring NTP similarity. An empirical application using bike‐share system data shows that the method is useful for detecting different usage patterns of two heterogenous user groups.
I’m looking forward to chairing the Mapping Science Committee (MSC) of the US National Academies of Sciences, Engineering and Medicine! We have a great committee for the next three years:
- Harvey J. Miller, Chair, The Ohio State University
- Daniel G. Brown, University of Michigan
- Stewart Fotheringham, Arizona State University
- Henry Lin, Pennsylvania State University
- Mark E. Reichardt, Open GIS Consortium, Inc.
- Kathleen Stewart, University of Maryland
- Kristin M. Tolle, Microsoft Research
- Grady H. Tuell, 3D Ideas
- Martha McCart Wells, Spatial Focus, Inc.
Here are the biographical sketches for this first-rate team.
The MSC organizes and oversees National Research Council studies that provide independent advice to society and to government at all levels on geospatial science, technology, and policy. It also addresses aspects of geographic information science that deal with the acquisition, integration, storage, distribution, and use of spatial data. Through its studies, the committee promotes the informed and responsible development and use of spatial data for the benefit of society.