Guoray Cai Ph.D. | College of Information Sciences and Technology
Close Open

Please Update Your Browser.

It is recommended that you update your browser to the latest version to view the website's full experience.


Guoray Cai, Ph.D.

You are here

Photo of Guoray Cai
  • Associate Professor of Information Sciences and Technology

  • Director, Spatial Information and Intelligence Laboratory

E321 Westgate Building
University Park, PA 16802
(814) 865-4448
  • Ph.D., Information Science, University of Pittsburgh, 1999

  • M.A., Geography, West Virginia University, 1993

  • M.E., Electrical Engineering, Tianjin University, China, 1986

  • B.E., Electrical Engineering, Tianjin University, China, 1983


Dr. Guoray Cai is an associate professor of Information Sciences and Technology at Penn State University, with affiliate appointments in Geography as well as in Computer Science and Engineering. He is the founding director of the Spatial Information and Intelligence Laboratory, which is housed in IST. He also is a member of the GeoVISTA center and the Center for Human-Computer Interaction.

Research Interests:

Cai conducts research in the areas of information retrieval, geographical information science, human-computer interaction and communication, and visual mediation of collaborative work. He has published papers in international journals such as Proceedings of IEEE, International Journal of Geographical Information Science, Transactions in GIS, Geoinformatics, Environment and Planning B, and the international journal of NETWORKS. He is a member of ACM, IEEE, and ASPRS.

Cai's research includes geographical information systems, geocollaboration, human-computer interaction, information retrieval, and spoken-dialogue systems. His recent work involves developing visually-mediated multimodal interactions techniques for enabling geocollaborative crisis management, GeoDeliberation  (National Science Foundation under grant IIS-1211059)

Cai teaches undergraduate and graduate courses in the areas of relational databases, knowledge management, spatial analysis and geographical information science, visual analytics, and social computing.

Research Keywords:

  • Geographical information science
  • Visual analytics
  • Online democracy and deliberation
  • Geocollaboration
  • Multimodal dialogue systems
  1. Lida Huang, Guoray Cai, Hongyong Yuan, and Jianguo Chen, 2019, “Agent-Based Grievance Contagion Model for Simulating the Outburst of Collective Violence.  Journal of Artificial Societies and Social Simulation.  (Accepted)
  2. Lida Huang, Guoray Cai, Hongyong Yuan, Jianguo Chen, 2019, “A Bayesian Network Approach for Assessing Threats of Mass Protests.” Expert Systems with Applications.  (Accepted)
  3. Cai, G., Sun, F., and Sha, Y., 2018, “Interactive Visualization for Topic Model Curation.” IUI’2018: International Conference on Intelligent User Interfaces,  Workshop Exploratory Search and Interactive Data Analytics (ESIDA), March 11, 2018, Tokyo, Japan
  4. Huang, L., Cai, G. (Co-Author, 25%), Yuan, H., Wang, Y., Deng, Q., & Sun, F. (2018). Modeling Threats of Mass Incidents Using Scenario-based Bayesian Network Reasoning. Proceedings of the 15th International Conference on Information Systems for Crisis Response and Management. Article No. 7,  Delft, The Netherlands — May 30 - June 01, 2018
  5. Lida Huang Guoray Cai Hongyong Yuan Jianguo Chen (2018). “From Public Gatherings to the Burst of Collective Violence: An Agent-based Emotion Contagion.” Proceedings of IEEE Intelligence and Security Informatics (ISI) 2018,  Miami, Florida, November 7-10, 2018.
  6. Deng, Q., Cai, G. (Co-Author, 25%), Zhang, H., Liu, Y., Huang, L., & Sun, F. (2018). Enhancing Situation Awareness of Public Safety Events by Visualizing Topic Evolution in Social Media. ACM  Dg.O '18 Proceedings of the 19th Annual International Conference on Digital Government Research: Governance in the Data Age.
  7. Sun, F. and Cai, G., 2017, “Community Issue Review: Crystallizing Knowledge for Encouraging Civic Engagement.” Dg.O 2017: 18th Annual International Conference on Digital Government Research, Staten Island, NY, USA, June 7-10, 2017..
  8. Cai, G., Sun, F., and Jessica Kropczynski, 2017, “Crystallizing Local Political Knowledge for Informed Public Participation.”  In Peter Parycek, Yannis Charalabidis, Andrei V. Chugunov, Panos Panagiotopoulos, Theresa A. Pardo, Øystein Sæbø, Efthimios Tambouris (Eds.),  IFIP EGOVEPART2017: The 16th IFIP Electronic Government (EGOV) and The 9th IFIP Electronic Participation (ePart) Conference, September 4 – September 7, 2017, St Petersburg, Russia.
  9. Cai, G., & Tian, Y. (2016). Towards Geo-referencing Infrastructure for Local News. In Proceedings of the ACM SIGSPATIAL International Conference on Advances in Geographical Information Systems, special session on Geographic Information Retrieval, 10/31 –11/ 3, 2016, San Francisco, California, USA: ACM
  10. Tian, Y. and Cai, G., 2016, “Collective Opinion Formation for Public Decision Making in Local Governments” Dg.O 2016: 17th Annual International Conference on Digital Government Research, Shanghai, China, June 8-10, 2016
  11. Cai, G. & Tian, Y. 2016, “Geospatial Referencing of Local News Articles.” GIScience 2016: The Ninth International Conference on Geographic Information Science, Montreal, Canada. September 2016
  12. Sun, F., Tian, Y., and Cai, G., 2016, “Designing Visual Analytic Support to Collaborative Information Foraging for Issue-Based Knowledge Crystallization.” IEEE Conference on Visual Analytics Science and Technology. Baltimore, MD. October 23-28, 2016
  13. Cai, G. 2015, “Context-Mediated Semantic Alignment of Heterogeneous Electronic Medical Record Systems for Integrated Healthcare Delivery,” HIMS'15 - The 2015 International Conference on Health Informatics and Medical Systems, July 27-30, Las Vegas, Nevada, USA
  14. Kropczynski, Jessica N., Guoray Cai, and John M. Carroll, 2015a. “Understanding the Roles of Artifacts in Democratic Deliberation from the Citizens’ Initiative Review.” Journal of Social Media in Organization, 3(2), 1-22.
  15. Kropczynski, Jessica N., Guoray Cai, and John M. Carroll. 2015b. “Characterizing democratic deliberation in an online forum” Information Polity - An International Journal of Government and Democracy in the Information Age., pp.151-1653.
  16. D. L .Hall, G. Cai and J. Graham (2015), “Cognitive Prosthetics for the Empowered Analyst.” chapter in: Information Fusion in Crisis Management, edited by G. Ragova and P. Scott, Springer
  17. Kropczynski, Jess, Guoray Cai, and John M. Carroll. 2014. “Investigating Incidence of Common Ground and Alternative Courses of Action in an Online Forum.” in dg.o 2014: the 15th Annual International Conference on Digital Government Research. June 18-21, 2014. Aguascalientes, Mexico: ACM. pp. 24–33
  18. Sha, Y., Yan, J., and Cai, G., 2014, “Detecting Public Sentiment Over PM2.5 Pollution Hazards through analysis of Chinese Microblog,” ISCRAM: The 11th International Conference on Information Systems for Crisis Response and Management.
  19. Cai, G. Gross, G., and Llinas, J., 2014, “A visual analytic framework for sense-making in investigative intelligence,” SPIE 2014 Conference on Sensing Technology and Applications, (Next-Generation Analysts II), Baltimore, MD May 6-9, 2014.  
  20. Cai, G., Yu, B., and Chen, D., 2013, "Modeling and Communicating the Conceptual Intent of Geo-Analytical Tasks for Human-GIS Interaction," Transactions in GIS, vol. 17, pp 1-13. 
  21. Cai, G., 2013, Teaching structured analytical thinking with data using visual-analytic tools, In: Carroll, J. (ed.) Innovative Practices in Teaching Information Sciences and Technology: Experience Reports and Reflections, by Springer
  22. Cai, G. and Yu, B., 2012, “Event-based Awareness Promotion Through Reasoning on Activity Dependencies,“ The 10th IEEE International Conference on Pervasive Intelligence and Computing (PiCom-2012), Changzhou, China, Dec. 17-20, 2012
  23. Yu, B. and Cai, G, 2012, “Coordination of emergency response operation via event-based awareness mechanisms,” ISCRAM’2012 - The 9th International Conference on Information Systems for Crisis Response and Management, April 22-25, 2012 Vancouver, Canada.
  24. Cai, G. 2011, “Relevance Ranking in geographical information retrieval.” ACM SIGSPATIAL Letters, vol.3, issue 2, pp. 33-36.
  25. Cai, G. an Yu, B., 2010, “Using Intentions and Plans of Mobile Activities to Guide Geospatial Web Service Composition.”  Proceedings of 2010 IEEE Asia-Pacific Services Computing Conference, December 6 - 10, 2010, Hangzhou, China.  pp. 141-148.
  26. Cai, G. and B. Yu, "Spatial annotation technology for public deliberation," Transactions in GIS, vol. 13, pp. 123-146, 2009.
  27. Yu, B. and G. Cai, 2009, "Facilitating Participatory Decision-Making in Local Communities through Map-Based Online Discussion," in The Fourth International Conference on Communities and Technologies (C&T 2009), University Park, PA.
  28. Cai, G. 2008 “Modeling Contextual Knowledge for Adaptive Geographic Visualization” Proceedings of the International Conference on Virtual Geographic Environment, Hongkong, China, January 7-8, 2008
  29. Fuhrmann, S., MacEachren, A. M., Cai, G., (2008) “Geoinformation technologies to support collaborative emergency management,” Hsinchun Chen, Lawrence Brandt, Valerie Gregg, Roland Traunmüller, Sharon Dawes, Eduard Hovy, Ann Macintosh, and Catherine A. Larson, (Eds.), Digital Government: Advanced Research and Case Studies, Springer.  Pp. 395-420
  30. Yu, B. and Cai, G. (2007) “A query-aware document ranking method for geographic information retrieval”, in Proceedings of the 4th ACM workshop on Geographical information retrieval, ACM: Lisbon, Portugal. pp.49-54.
  31. Cai, G. 2007,“Formalizing Analytical Discourse in Visual Analytics,” Proceedings of VAST’2007 – IEEE Symposium on Visual Analytics Science and Technology, Sacramento, CA, Oct. 28 – Nov. 1, 2007
  32. Cai, G. (2007) "Contextualization of geospatial database semantics for mediating human-GIS dialogues." GeoInformatica 11(2) pp.217-237
  33. MacEachren, A. M. and Cai, G. (2006) "Supporting Group Work in Crisis Management: Visually mediated human-GIS-human dialogue." Environment and Planning B: Planning and Design. 33(3), pp. 435-456.
  34. Cai, G., Sharma, R., MacEachren, A.M., and Brewer, I. (2006) “Human-GIS Interaction Issues in Crisis Response”. International Journal of Risk Assessment and Management. (special issue on GIS in Crisis management) 6(4), pp. 388-407.
  35. MacEachren, A. M., G. Cai, Brewer, I., and Chen, J. (2006) "Supporting map-based geocollaboration through natural interfaces to large-screen display." Cartographic Perspectives54(1), pp. 4-22
  36. Cai, G. and Xue, Y. (2006) “Activity-oriented Context-aware Adaptation Assisting Mobile Geo-spatial Activities.”  ACM IUI’2006 – International Conference on Intelligent User Interface, Sydney, Australia, January 29 – February 1, 2006.
  37. Cai, G. and MacEachren, A. (2005) "Supporting effective human interactions with geographic information during crisis response." GeoMatica 59(4): 415-25.
  38. Cai, G. (2005) “Extending distributed GIS to support geocollaborative crisis managementGeographical Information Science. (Special issue on distributed GIS) 11(1): 4-14.
  39. Cai, G., Wang, H., MacEachren, A.M., and Fuhrmann, S. (2005) 'Natural Conversational Interfaces to Geospatial Databases'. Transactions in GIS, 9(2), pp.199-221.
  40. MacEachren, A M, Cai, G, Sharma, R, Brewer, I and Rauschert, I (2005) “Enabling collaborative geoinformation access and decision-making through a natural, multimodal interface”. International Journal of Geographical Information Science 19(3): 293-317
  41. MacEachren, A.M., Gahegan, M., Pike, W., Brewer, I., Cai, G., Lengerich, E., and Hardisty, F. (2004) 'Geovisualization for knowledge construction and decision support IEEE Computer Graphics and Applications. 24(1) pp.13 - 17.
  42. Cai, G. (2004) “Visualization for Geographical Information RetrievalNew Technology in Library and Information Services Special issue on information visualization. 2004(10): 14-23.
  43. Sharma, R., Yeasin, M., Krahnstoever, N., Rauschert, Cai, G., Brewer, I., MacEachren, A., and Sengupta, K. (2003) 'Speech-Gesture Driven Multimodal Interfaces for Crisis Management'. Proceedings of the IEEE. 91(9) pp.1327-1354. (special issue on human-computer multimodal interface)
  44. Cai, G, Wang, H, MacEachren, A.M. (2003) “Communicating vague spatial concepts in human-GIS interactions: a collaborative dialogue approach”, Lecture Notes in Computer Science 2825: Spatial information theory - Foundations of Geographic Information Science; COSIT 2003 Proceedings, Kartause Ittingen, Switzerland. September 24-28, 2003. pp. 287 - 300
  45. Cai, G. (2002) “GeoVIBE: A Visual Interface for Geographical Information in Digital Libraries,” Lecture Notes on Computer Science 2539: Visual Interfaces for Digital Libraries (Springer Verlag) pp. 171-187
  46. Cai, G. (2002) “GeoVSM: An Integrated Retrieval Model For Geographical Information,” Lecture Notes on Computer Science 2478: Geographical Information Science: Second International Conference on GIScience, Boulder, Colorado, September 25-28, 2002.  pp. 65-79.
  47. Rauschert, I, Agrawal, P, Fuhrmann, S, Brewer, I, Sharma, R, Cai, G, et al. (2002) “Designing a user-centered, multimodal GIS interface to support emergency management”. In: Proceedings of the tenth ACM international symposium on Advances in geographic information systems. Chen S-C and Voisard A. (eds.) McLean, VA: ACM, 2002: 119-124. 05. Edited by Kantor P, Muresan G, Roberts F, al. e. Atlanta, Georgia, Springer, 2005, pp 429-435.
  48. Cai, G. 2002, "A GIS Approach to the spatial assessment of telecommunications infrastructure," Networks and Spatial Economics, (special issue on Geographical Information Science). vol. 2, pp. 35-63.
  49. Cai G. and Sun Y., 1989, "The Minimum Augmentation of Any Graph to a K-edge-connected Graph". NETWORKS, Vol.19 (1989), no. 1, pp.151-172
  50. Cai G. and Sun Y., 1986, "The Minimum Augmentation of Any Connected Graph To a K-edge-connected Graph". Proceedings of IEEE 1986 International Symposium on Circuits and Systems. Held in San Jose, CA, May, 1986. pp.984-987.