I am an Assistant Professor of Geographic Information Science in the School of Geosciences at the University of South Florida in Tampa, Florida, USA. I am also a Fellow with the Kinder Institute for Urban Research at Rice University in Houston, Texas. My research and teaching interests focus on the development and applications of GIS, spatial analysis, and visualization techniques in urban systems and public policy implications. The subjects of my research include transportation, human mobility and accessibility, public health, crime, and human-environment interactions. My research has been covered by the ABC 13 News of Houston and the Houston Public Media News, and supported by the Florida Sea Grant, Southeastern Association of State Highway and Transportation Officials (SASHTO), and the American Association of Geographers (AAG). I am a Board Member of the Transportation Geography Specialty Group of the American Association of Geographers.

Learn what's going on with me.


"Measuring and Visualizing Place-Based Space-Time Job Accessibility" published in Journal of Transport Geography.


"GIS-Based Simulation and Analysis of Intra-Urban Commuting" published with CRC Press. Go to DOWNLOADS for the data and codes used in the book.


I'm seeking new graduate students (master or doctoral) who are interested in GIS development and applications. Email me your CV/Resume if interested.


"Where are the Dangerous Intersections for Pedestrians and Cyclists: A Colocation-Based Approach" published in Transportation Research Part C.


"A Spatio-Temporal Kernel Density Estimation Framework for Predictive Crime Hotspot Mapping and Evaluation" published in Applied Geography.

Explore the research projects that I've been working on.

See where my research is published.


Learn what courses I teach.


This course introduces the fundamental concepts, techniques and applications of Geographic Information Systems (GIS). It also teaches the essential skills of operating the popular GIS software ESRI ArcGIS, which are valuable in both academia and industry, through a series of step-by-step lab assignments. After successful completion of this course, you should:


This course is designed to help students learn advanced concepts and methods of Geographic Information Systems (GIS) and their applications in socioeconomic research fields including transportation, public health, and crime. This course will be delivered by a series of lectures, readings, and lab assignments. Concepts, methods, and skills are built into each lab assignment. These lab assignments are designed to help students gain hands-on experience on the topics presented in lectures. After successful completion of this course, you should:

Get the data and codes to replicate my research.

All the data and computer programs used in the book are provided here. Please cite:

Two toolkits (Localized_CLQ.exe and Global_CLQ.exe) are developed to automate the computations of Localized Colocation Quotient (LCLQ) and Global Colocation Quotient (GCLQ), respectively. The outputs also include results on corresponding statistical significance tests. Please cite:

Where and how to reach me?


4202 E. Fowler Ave., NES 107

Tampa, FL 33620


Room 305

NES Building (see map below)


Office: +1.813.974.4580

Fax: +1.813.974.4808