Harvey Miller uses new mobility data to understand cities and transportation

I was interviewed by Prof. David Staley for the Ohio State University Voices of Excellence from Arts and Sciences podcast: we talk about GIS, sustainable transportation, mobility data and time geography.

Check it out:

Harvey Miller uses new mobility data to understand cities and transportation

New publication: Accessibility with time and resource constraints

Mahmoudi, M., Song, Y., Miller, H.J. and Zhou, X.  (2019) “Accessibility with time and resource constraints: Computing hyper-prisms for sustainable transportation planning,” Computers, Environment and Urban Systems, 73, 171-183

Abstract

Accessibility is the ease of obtaining desired destinations, activities, or services in an environment. A common accessibility measure in basic and applied transportation science is the space-time prism (STP) and the network-time prisms (NTPs): these are the envelopes of all possible paths between two locations and times in planar space and transportation networks, respectively. STPs and NTPs focus on time as the scarce resource limiting accessibility. However, other resource constraints can constrain space-time accessibility, such as limits or “budgets” for energy, emissions, or monetary expenses. This paper extends NTPs to include other resource constraints in addition to time. Network-based resource hyper-prisms (RHPs) incorporate other resource constraints into NTP, capturing the trade-offs between time and other resources in determining space-time accessibility. We conceptualize RHPs as a constrained optimization problem and develop a forward and backward resource-dependent time-dependent dynamic programming to determine the boundaries of a RHP given time and other resource budgets. We illustrate our approach using the Chicago sketch network (with 933 nodes and 2967 links) for the use case of an individual with an internal combustion engine vehicle and a carbon emission budget and using portions of Washington, D.C. and Baltimore networks (with 12,145 nodes and 30,697 links) for the use case of siting electric vehicle charging stations to maximize regional accessibility.

Keywords

Resource hyper-prisms; Space-time prisms; Accessibility; Sustainable transportation; Dynamic programming

New paper – Street use and design: Daily rhythms on four streets that differ in rated walkability

Werner, C.M., Brown, B.B., Stump, T., Tribby, C.P., Jensen, W., Miller, H.J., Strebel, A. and Messina, A. (2018) “Street use and design: Daily rhythms on four streets that differ in rated walkability,” Journal of Urban Design, DOI: 10.1080/13574809.2018.1448706