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Geospatial intelligence (GEOINT) refers to the collection, organization, analysis, and dissemination of information on the position and complementary attributes of physical features, man-made structures, moving objects, people, events, and activities. Thus, it covers a wide range of diverse applications, ranging from environmental monitoring and emergency response to social media analytics, intelligent vehicle navigation, and surveillance.

The Center for Geospatial Intelligence (CGEOINT) at George Mason University (GMU) is conducting, supporting, and coordinating research, teaching, technology transfer, and outreach activities in geospatial intelligence. With strong expertise in geoinformatics, ranging from remote sensing and geographic information science to digital image analysis and sensor networks, and a very strong portfolio on open-source content analysis (with an emphasis on social media analytics) CGEOINT is uniquely positioned, both academically and geographically, to become an Academic leader in the rapidly growing field of Geospatial Intelligence.


The Center for Geospatial Intelligence (CGEOINT) at George Mason University focuses on research that relates to geospatial and spatiotemporal information extraction, analysis, and visualization.

Research Activities

The Center for Geospatial Intelligence (CGEOINT) at George Mason University focuses on research that relates to geospatial and spatiotemporal information extraction, analysis, and visualization. This includes image and video processing and analysis for information extraction, harvesting geospatial information from social media feeds, geosensor networks, spatial and spatiotemporal databases, spatiotemporal modeling and analysis , and complex visualization solutions.

Sample recently funded research projects:

  • “Crowdsourced Gazetteers to Communicate Place Dynamics” Duration: 07/01/14-06/30/16. Sponsor: National Geospatial Intelligence Agency (NGA). PIs: D. Pfoser, A. Stefanidis, A. Croitoru, A. Crooks.

  • “GeoSocial Analysis of Social Media Feeds”. Duration: 07/01/2012-06/30/2013. Sponsor: Draper Lab. PIs: A. Stefanidis, A. Croitoru, A. Crooks. 

  • “Feature Ontology Alignment through Scene Analysis”. Duration: 04/01/12-03/31/13. Sponsor: National Geospatial Intelligence Agency (NGA). PI: A. Stefanidis.

  • “Finder” . Duration: 3/08/2012 – 3/07/2016. Sonsor: IARPA. PIs: J. Kosecka, A. Stefanidis. 

  • “Spatiotemporal Analysis for Geospatial Surveillance Applications: Sensor Mobility”. Duration: 2011-12. Sponsor: Draper Lab. PIs: A. Stefanidis, G. Cervone, A. Croitoru. 

  • “MobiSynth: Enhancing Virtual Environments through Motion Imagery Analysis”, Duration: 2010-12. Sponsor: National Geospatial Intelligence Agency (NGA). PIs: A. Stefanidis, J. Kosecka, M. Rice. 

  • “Spatiotemporal Analysis for Geospatial Surveillance Applications”. Duration: 2010-11. Sponsor: Draper Lab. PI: A. Stefanidis. 

  • “Spatio-Temporal Tracking of Entities: Determining Object Location from Text Descriptions through Spatial Analysis”. Duration: 2008-11. Sponsor: National Geospatial Intelligence Agency (NGA) - sub-award via Brandeis University, PIs: A. Stefanidis, P. Agouris.


The CGEOINT team comprises faculty, research associates, and graduate research assistants.



Anthony Stefanidis (Director)
Phone: (703) 993 9237
Fax: (703) 993 9299
Arie Croitoru
Associate Professor
Phone: (703) 993 5428
Fax: (703) 993 9299
Dieter Pfoser
Associate Professor
Phone: (703) 993 6029
Fax: (703) 993 9299


Jacek Radzikowski
Center Engineer
George Lamprianidis
Data Scientist
Andrew Jenkins
Graduate Research Assistant, Ph.D. student

Affiliated Faculty

Andrew Crooks
Andrew Crooks
Associate Professor
Phone: 703-993-4640


Former Members

Dr. Richard Medina
Dr. Richard Medina
Assistant Professor 
Now Assistant Professor with the University of Utah
Dr. Charles Twardy
Dr. Charles Twardy
Research Assistant Professor
Now a Research Faculty with the GMU C4I Center
Dr. Caixia Wang
Dr. Caixia Wang
Now Assistant Professor with the University of Alaska - Anchorage
Dr. Xu Lu
Dr. Xu Lu
Now with Capital One Bank
Dr. George Panteras
Now with the World Bank



CGEOINT researchers publish in a variety related to image analysis, geospatial and spatiotemporal modeling and analysis.


A. Croitoru, A. Crooks, J. Radzikowski, & A. Stefanidis, 2015. Geovisualization of Social Media, The International Encyclopedia of Geography. (in press) 

D. Sun, S. Li, W. Zheng, A. Croitoru, A. Stefanidis, & M. Goldberg, 2015. Mapping Floods due to Hurricane Sandy using NPP VIIRS and ATMS Data and Geotagged Flickr Imagery, International Journal of Digital Earth (in press) 

A. Croitoru, N. Wayant, A. Crooks, J. Radzikowski & A. Stefanidis, 2015. Linking Cyber and Physical Spaces through Community Detection and Clustering in Social Media Feeds, Computers, Environment & Urban Systems. (in press)

A. Crooks, D. Pfoser, A. Jenkins*, A. Croitoru, A. Stefanidis, S. Karagiorgou, A. Efentakis, G. Lampriniadis & D. Smith, 2015. Crowdsourcing Urban Form and Function, International Journal of Geographical Information Science, 29(5): 720-741.



A. Crooks, A. Hudson-Smith, A. Croitoru, & A. Stefanidis, 2014. The Evolving GeoWeb, Geocomputation, 2nd ed., (R.J. Abrahart & L.M. See, eds.), CRC Press, pp. 67-94.

A. Croitoru, A. Crooks, J. Radzikowski, A. Stefanidis, R. Vatsavai, and N. Wayant, 2014. Geoinformatics and Social Media: A New Big Data Challenge. In Big Data Techniques and Technologies in Geoinformatics (H. Karimi, editor), CRC Press, pp. 207-232.

A. Stefanidis, A. Crooks, J. Radzikowski, A. Croitoru, and M. Rice, 2014. Social Media and the Emergence of Open-Source Geospatial Intelligence. In Socio-Cultural Dynamics and Global Security: Interdisciplinary Perspectives on Human Geography in an Era of Persistent Conflict, (C. Tucker and R. Tomes, editors), USGIF, pp. 109-123.

G. Panteras, S. Wise, X. Lu, A. Croitoru, A. Crooks & A. Stefanidis, 2014. Triangulating Social Multimedia Content for Event Localization using Flickr and Twitter, Transactions in GIS (in press).

W. Mullen, S.P. Jackson, A. Croitoru, A. Crooks, A. Stefanidis & P. Agouris, 2014. Assessing the Impact of Demographic Characteristics on Spatial Error in Volunteered Geographic Information Features, GeoJournal. DOI: 10.1007/s10708-014-9564-8.

S. Dias, Ch. Yang, A. Stefanidis & M. Rice, 2014. Mashing Up Geographic Information for Emergency Response – An Earthquake Prototype, Journal of Geographic Information System, 6: 533-547.

A. Crooks, D. Masad, A. Croitoru, A. Cotnoir, A. Stefanidis & J. Radzikowski, 2014. International Relations: State-Driven and Citizen-Driven Networks, Social Science Computer Review. 32(2): 205-220. (Sp. Issue: Quantifying Politics using Online Data)

K. Curtin, G. Voicu, M. Rice & A. Stefanidis, 2014. A Comparative Analysis of Traveling Salesman Solutions from Geographic Information Systems, Transactions in GIS. 18(2): 286-301.

G. Valkanas, I. Katakis, D. Gunopulos, & A. Stefanidis, 2014. Mining Twitter Data with Resource Constraints, IEEE/WIC/ACM International Conference on Web Intelligence (WIC 2014), Warsaw, Poland. 1: 157-164.


X. Lu, A. Croitoru, J. Radzikowski, A. Crooks, & A. Stefanidis, 2013. Comparing the Spatial Characteristics of Corresponding Cyber and Physical Communities: A Case Study, Proceedings ACM SIGSPATIAL Workshop on Location-Based Social Networks (LSBN 2013), Orlando, FL.

A. Croitoru, A. Crooks, J. Radzikowski & A. Stefanidis, 2013. GeoSocial Gauge: A System Prototype for Knowledge Discovery from Social Media, International Journal of Geographical Information Science, 27(12): 2483-2508. 

M. Rice, R. Jacobson, D.R. Caldwell, S. McDermott, F. Paez, A. Aburizaiza, K. Curtin, A. Stefanidis & H. Qin, 2013. Crowdsourcing Techniques for Augmenting Traditional Accessibility Maps with Transitory Obstacle Information, Cartography and Geographic Information Science, 40(3): 210-219. 

S.P. Jackson, W. Mullen, P. Agouris, A. Croitoru, A. Crooks & A. Stefanidis, 2013. Assessing Completeness and Spatial Error of Point Data in Volunteered Geographic Information, ISPRS International Journal of Geo-Information, 2: 507-530. Note: This article was also spotlighted in IQT Quarterly, 5(2): 22-26. 

S. Li, D. Sun, M Goldberg, & A. Stefanidis, 2013. Derivation of 30-m Resolution Water Maps from TERRA/MODIS and SRTM, Remote Sensing of the Environment, 134: 417-430. 

A. Stefanidis, A. Cotnoir, A. Croitoru, A. Crooks, M. Rice & J. Radzikowski, 2013. Demarcating New Boundaries: Mapping Virtual Polycentric Communities through Social Media Content, Cartography and Geographic Information Science, 40(2): 116-129. Note: This article was also spotlighted in IQT Quarterly, 5(2): 12-14. 

A. Stefanidis, A. Crooks & J. Radzikowski, 2013. Harvesting Ambient Geospatial Information from Social Media Feeds, Geojournal, 78(2): 319-338. 

S. Li, D. Sun, Y. Yu, I. Csiszar & A. Stefanidis, 2013. A New Shortwave Infrared (SWIR) Method for Quantitative Water Fraction Derivation and Evaluation with EOS/MODIS and Landsat/TM Data, IEEE Transactions on Geoscience and Remote Sensing, 51(3): 1852-1862. 

A. Crooks, A. Croitoru, A. Stefanidis & J. Radzikowski, 2013. #Earthquake: Twitter as a Distributed Sensor System, Transactions in GIS, 17(1): 124-147. 



R. J. Clark, 2012.Spatial Arrangement as a Part of Geospatial Feature Ontologies, PhD Dissertation, November 2012.

A. Crooks, A. Croitoru, A. Stefanidis & J. Radzikowski, 2012. #Earthquake: Twitter as a Distributed Sensor System, Transactions in GIS (in press)

R. A. Jenkins, 2012. Mapping Location-Based Social Topics in Todayʼs Evolving Cities, MS Thesis, November 2012.

R. J. Magarick, 2012. Improving Vegetation and Background Discrimination from Hyperspectral Imaging (HIS) and Light Detection and Ranging (LIDAR) Fusion Using an Added Shortwave Infrared (SWIR) HIS Component, MS Thesis, November 2012. 

R. Zhang, D. Sun, Y. Yu, A. Stefanidis, & M.D. Goldberg, 2012. Validation of the GOES-R ABI Flood and Standing Water Algorithm using Gauging Station Measurements and Interpretation Maps, Remote Sensing of the Environment, Vol. 123, pp. 483-495.

A. Croitoru, A. Stefanidis, J. Radzikowski, A. Crooks, J. Stahl & N. Wayant, 2012. Towards a Collaborative GeoSocial Analysis Workbench, COM.Geo '12, Washington, DC (in press). 

R.M. Medina, 2012. Social Network Analysis: A Case Study of the Islamist Terrorist Network. Security Journal, (in press)

A. Stefanidis and M. Rice, 2012. Geoinformation from all and for all. Geospatial Today, March 2012, pp. 12-16.

C. Wang, A. Stefanidis & P. Agouris, 2012. Spatial Content-Based Scene Similarity Assessment, ISPRS Journal of Photogrammetry & Remote Sensing Vol. 69, pp. 103-120. DOI: 10.1016/j.isprsjprs.2012.02.007

A. Stefanidis, A. Crooks, J. Radzikowski, A. Croitoru, and M. Rice, 2012. Social Media and the Emergence of Open-Source Geospatial Intelligence. in Socio-Cultural Dynamics and Global Security (C. Tucker and R. Tomes, editors), USGIF


R.M. Medina and G.F. Hepner, 2011. Advancing the Understanding of Sociospatial Dependencies in Terrorist Networks. Transactions in GIS,15(5): 577-597.

R.M. Medina, L.K. Siebeneck, & G.F. Hepner, 2011. A Geographic Information Systems (GIS) Analysis of Spatiotemporal Patterns of Terrorist Incidents in Iraq 2004-2009. Studies in Conflict and Terrorism, 34: 862-882.

X. Lu, C. Wang, N. Karamnzadeh, A. Croitoru & A. Stefanidis, 2011. Deriving Indoor Scene Structure with path Analysis, ACM GIS 2011 – Workshop on Indoor Spatial Awareness, Chicago

G. Mountrakis and A. Stefanidis, 2011. Moving towards Personalized Geospatial Queries. Journal of Geographic Information System, 3(4): 334-344.

J. Pustejovsky, M. Verhagen, A. Stefanidis & C. Wang, 2011. Geolocating Orientational Descriptions of Landmark Configurations, Workshop on Computational Models of Spatial Language Interpretation and Generation (CoSLI-2), Boston, MA, pp. 32-39.

C. Twardy & A. Stefanidis, 2011. Local Complexity Adaptable Trajectory Partitioning via Minimum Message Length. IEEE ICIP'11 (International Conference on Image Processing), Brussels, pp. 1917-1920.


A. Stefanidis, 2010. GeoSensor Networks and Sensor Web: The Move towards Systems of Sensor Systems. In Advanced Geoinformation Science (C. Yang et al., eds.), CRC Press, pp. 64-69.

A. Croitoru, P. Agouris, & A. Stefanidis, 2010. Still and Motion Image Analysis, in Advanced Geoinformation Science (C. Yang et al., eds.), CRC Press, pp. 172-194. 

C. Wang, P. Agouris & A. Stefanidis, 2010, Statistical and Structural Descriptions for Image to Map Registration, Int. Archives of Photogrammetry & Remote Sensing, Vol. 38, Part B4, Orlando (in press).

J. Radzikowski, X. Lu, A. Stefanidis, & M. Rice, 2010, Visualizing Distributed Dynamic Geospatial Information in Google Earth, Int. Archives of Photogrammetry & ReCmote Sensing, Vol. 38, Part B4, Orlando (in press).



A. Stefanidis, C. Wang, X. Lu & K Curtin, 2009. Multilayer Scene Similarity Assessment, IEEE International Conference on Data Mining – Workshops (Spatial and Spatiotemporal Data Mining - SSTDM'09), Miami, FL, pp. 622-629.

G. Cervone, A. Stefanidis, P. Franzese & P. Agouris, 2009. Spatiotemporal Modeling and Monitoring of Atmospheric Hazardous Emissions using Sensor Networks, IEEE International Conference on Data Mining – Workshops (Spatial and Spatiotemporal Data Mining - SSTDM'09), Miami, FL, pp. 571-576.


C. Wang, A. Stefanidis, A. Croitoru & P. Agouris, 2008. Map Registration of Image Sequences using Linear Features, Photogrammetric Engineering & Remote Sensing, Vol. 74, No. 1, pp. 25-38. (paper awarded the "John I. Davidson President's Award for Practical Papers" (3rd Place) by the American Society for Photogrammetry & Remote Sensing, in 2009).

S. Nittel, A. Labrinidis and A. Stefanidis, 2008. Advances in GeoSensor Networks, Lecture Notes in Computer Science, Springer, Vol. 4540 (272 pages).

S. Nittel, A. Labrinidis & A. Stefanidis, 2008. Introduction to Advances in Geosensor Networks, in GeoSensor Networks '06, (S. Nittel, A. Labrinidis, & A. Stefanidis, eds.), Lecture Notes in Computer Science, Vol. 4540, Springer Verlag.

J. Devine & A. Stefanidis, 2008. Support Vector Machines for Spatiotemporal Analysis in Geosensor Networks, Spatial Data Handling '08, (A. Ruas & C. Gold, eds.), Montpellier, pp. 197-216.


Among the various educational offerings of the Department of Geography and Geoinformation Science, the Center is more closely related to the Graduate Certificate in Geospatial Intelligence, the MS program in Geoinformatics and Geospatial Intelligence, and of course the Ph.D. program.


The Center for Geospatial Intelligence is affiliated with the Department of Geography and Geoinformation Science of the College of Science


The Center is heavily involved with the following academic programs:

Training projects administered by the Center include:

“Geoinformatics and Spatial Intelligence Training Educational Offering”. Duration: 2010-15. Sponsor: Army Geospatial Center. (a training project) PI: A. Stefanidis.


Center for Geospatial Intelligence

George Mason University
4400 University Drive, MS 6C3
Fairfax, VA 22030

The GeoInt lab is located in room 290 of Research I in our Fairfax Campus.

Emails of Center researchers are found in this page