Arie Croitoru

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Social media feeds are rapidly emerging as a novel avenue for the contribution and dissemination of information that is often geographic. Their content often includes references to events occurring at, or affecting specific locations. Within this article we analyze the spatial and temporal characteristics of the twitter feed activity responding to a 5.8(More)
Recent technological advances have made it possible to collect large amounts of 3D trajectory data. Such data play an essential role in numerous applications and are becoming increasingly important in mobile computing. One of the fundamental challenges in many of these application areas is the assessment of similarity between trajectories. As objects moving(More)
The assessment of the quality and accuracy of Volunteered Geographic Information (VGI) contributions, and by extension the ultimate utility of VGI data has fostered much debate within the geographic community. The limited research to date has been focused on VGI data of linear features and has shown that the error in the data is heterogeneously distributed.(More)
The remarkable success of online social media sites marks a shift in the way people connect and share information. Much of this information now contains some form of geographical content because of the proliferation of location-aware devices, thus fostering the emergence of geosocial media – a new type of user-generated geospatial information. Through(More)
Salt pools are water-filled depressions common to north-temperate salt marshes. In Wells, ME, USA, cores reveal a unique salt pool signature consisting of watersaturated dark-gray mud often containing fragments of Ruppia maritima. Cores through pool sediment reenter salt marsh peat, not tidal flat sediment, demonstrating that most pools are of secondary(More)
With volunteered geographic information (VGI) platforms such as OpenStreetMap (OSM) becoming increasingly popular, we are faced with the challenge of assessing the quality of their content, in order to better understand its place relative to the authoritative content of more traditional sources. Until now, studies have focused primarily on developed(More)
ii This work is licensed under a creative commons attribution-noderivs 3.0 unported license. iii DEDICATION To B. iv ACKNOWLEDGEMENTS I would like to thank my thesis advisor, Dr. Arie Croitoru, for all of his help, ideas, and insight. His guidance and feedback were key to the success of this thesis. I would also like to thank Dr. Andrew Crooks and Dr. Tony(More)
Demarcating new boundaries: mapping virtual polycentric communities through social media content Anthony Stefanidis a b , Amy Cotnoir a , Arie Croitoru a b , Andrew Crooks c , Matthew Rice b & Jacek Radzikowski a a Center for Geospatial Intelligence, George Mason University, Fairfax, VA, 22030, USA b Department of Geography and Geoinformation Science,(More)