Research
From methods and data to real-world transportation applications.
I develop computational methods, data resources, and applied analytics to recover, represent, and understand human mobility from incomplete observations. This page presents my research studies, software and datasets, and industry/agency projects.
Research Studies
Methodological and empirical research on mobility reconstruction, representation, and applications.
Sup-HMM
Journal PaperBayesian-optimized map matching for sparse and noisy trajectories.
- Reliable trajectory reconstruction from incomplete observations
- Bayesian optimization and supplementary transition mechanism
- Robust to data sparsity and noise
PM-Tree
Under ReviewPriority-guided hierarchical trajectory representation.
- Hierarchical and adaptive representation of trajectories
- Preserving structural mobility information with few observations
- Only ~3% of points recover over 96% of structure
HSMM-T
Under ReviewCross-network mobility translation for planning applications.
- Translating observed trajectories to planning networks
- Preserving movement patterns across network systems
- Supporting network-based analysis
Transit Mirage
Under RevisionRethinking transit demand-supply imbalance using observed mobility.
- Empirical analysis of transit accessibility
- Identifying apparent vs. real transit deserts
- Implications for equity and planning
Research Software & Data
Computational tools and datasets for mobility analysis.
NovaMatch
Research SoftwareTrajectory intelligence ecosystem.
A unified framework for trajectory processing, map matching, cross-network translation, trajectory representation, and mobility analytics.
- ObserveSparse, noisy GPS trajectories
- RecoverNetwork-constrained paths on OSM or custom networks
- TranslateRoad trajectories to planning networks
- ScalableBuilt for large mobility datasets
Complete Trip
DatasetPreprintA linked multimodal human mobility dataset.
Reconstructing complete journeys from passively collected LBS observations across the Salt Lake City region. Supports mobility research, activity analysis, and transportation planning.
- 28.7M+Complete trips
- 282K+Unique devices
- 6 Utah CountiesSalt Lake City region
- 4 Travel ModesCar · Walk/Bike · Bus · Rail
- Full Year 2020Controlled access via DUA
Sponsored & Collaborative Projects
Contributions to transportation research projects supported by federal, state, and regional agencies, and industry partners.
2026 – PresentRegional Land Use Modeling and Future-Year Scenario Development
- Model development and project coordination
- Model adaptation, calibration, and validation
- Future-year scenario development
- Technical deliverables and model transfer
Collaborating Organizations: DVRPC & Univ. of Memphis
From Data to Design: Enhancing Pedestrian Infrastructure for Well-Being
- GPS trajectory processing and spatial analysis
- Integrating mobility, built environment, and experience data
- Studying the relationship between pedestrian infrastructure and well-being
Collaborator: Human Centered Cities Lab (PI: Arash Tavakoli)
2026 – PresentEnhanced Vehicle Inspection Station Research
- Statewide spatial and data-driven analysis
- Service demand, geographic coverage, and oversight
- Service-saturation and audit-priority metrics
- Decision support for PennDOT
Agency: PennDOT
2025 – 2026Utilizing Big Data to Verify and Enhance Route Choice Models in Travel Demand Modeling
- Methodological development and large-scale analysis
- Cross-network translation of connected-vehicle data
- Empirical evaluation of route-choice and network representation
Outputs: HSMM-T (Under Review) · Zone Connectors (TR Part A, Under Review)
2023 – 2025Complete Trip Data Analysis, Acquisition and Multimodal Measure Testing
- Trajectory reconstruction and network representation
- Large-scale multimodal data processing and validation
- Map-matching and complete trip inference
Output: Complete Trip (Preprint)
William P. Hobby Airport Landside Traffic Analysis
- VISSIM microsimulation modeling and calibration
- Network coding, demand and routing development
- Operational analysis of access, circulation, and curbside facilities
- Congestion, queueing, travel time, and scenario evaluation
Other Research
Earlier work in computer vision and transportation engineering.
