Advanced space-time integration for knowledge discovery in human mobility studies

In the past decade or so, advances in positioning technologies and the prevalence of smart personal devices for capturing individual movement have given rise to a wide range of studies, including transportation, public health, tourism, and social network services. With the fast-growing volume of and interest in spatio-temporal mobility data, there is also an increasing need for new methods of analyzing this kind of data. Particularly, considerable effort has been made to characterize human activity-travel patterns from the spatio-temporal mobility data. However, knowledge discovery from the large-scale human mobility data remains a challenging task due to its complex spatio-temporal variations. Most traditional statistical and machine learning techniques are powerful for prediction tasks but are not tailored to characterize the dynamical spatio-temporal correlations in the human mobility data. This dissertation offers several methodological and practical contributions to the field through developing a set of novel methods and validation with real-world use cases. First, a locally adaptive space-time kernel approach is proposed to model the non-emergency municipal services demand in Chicago. Second, this work develops novel sequential similarity measures for analyzing human activity-travel patterns and Bayesian networks models with specially designed topology to predict the forthcoming activity at the individual level. Last, a deep convolutional LSTM networks model is proposed to capture the spatial and temporal dependencies in an integrated way to predict real-time taxi demand. All proposed models are proven to be more effective or robust in various real-world experiments as compared to traditional statistical or machine learning algorithms but are not limited to these use cases. The methods contribute to any point demand modeling, regional demand modeling, and sequential trajectory learning problems for spatio-temporal data.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Geography

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2020

Author dc:creator

• Xu, Li

Contributors dc:contributor

• Kwan, Mei-Po
• McLafferty, Sara
• Li, Bo
• Cidell, Julie

• Space-time modeling
• Mobility
• Space-time kernel
• Sequential pattern mining
• Bayesian networks
• Demand modeling
• Deep learning
• LSTM

Statement dc:rights

• Copyright 2019 Li Xu

Language dc:language

en

Handle dc:identifier

http://hdl.handle.net/2142/106442

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/106442