Research Projects

1. Viewer centric data retrieval:

Virtual reality videos and games require novel data retrieval technique, which is called What-You-Retrieve-Is-What-You-See. The aim of this project is to support retrieving spatial objects that are both visually conspicuous and semantically relevant to the users.

Selected Publications

• Finding the optimal location and keywords in obstructed and unobstructed space, Farhana Murtaza Choudhury, J. Shane Culpepper, Zhifeng Bao, and Timos Sellis, in Very Large Data Bases Journal (VLDBJ), vol. 27(4), pp. 445-470, 2018. ERA Rank - A*.
• VizQ: A System for Scalable Processing of Visibility Queries in 3D Spatial Databases (Demo track), Arif Arman, Kaysar Abdullah, Mohammed Eunus Ali, and Farhana Murtaza Choudhury, In Proc of CIKM, pp. 2447-2450, 2017. CORE Rank - A.
• Scalable Visibility Color Map Construction in Spatial Databases, Farhana Murtaza Choudhury, Mohammed Eunus Ali, Sarah Masud, Suman Nath, and Ishat E. Rabban, In the Journal of Information Systems, vol. 42: 89-106, 2014. CORE Rank - A*.
• Maximum Visibility Queries in Spatial Databases, Sarah Masud, Farhana Murtaza Choudhury, Mohammed Eunus Ali, and Sarana Nutanong, In Proc. of IEEE International Conference on Data Engineering (ICDE), pp. 637-648, 2013. CORE Rank - A*.
• Continuous Maximum Visibility Query for a Moving Target, Ch. Md. Rakin Haider, Arif Arman, Mohammed Eunus Ali, and Farhana M. Choudhury, in Proc. of Australasian Database Conference (ADC), pp. 82-94, 2016. (Winner of the best student poster award).
• Top-k trajectories with the best view, NI Tripto, M Nahar, ME Ali, FM Choudhury, JS Culpepper, T Sellis, in GeoInformatica Journal, pp. 1-41, 2019.

3. Streaming data:

Store data and answer practical queries efficiently when new data arrives at a high speed.

• Monitoring the Top-m Rank Aggregation of Spatial Objects in Streaming Queries, Farhana Murtaza Choudhury, Zhifeng Bao, J. Shane Culpepper, and Timos Sellis, In Proc. of IEEE International Conference on Data Engineering (ICDE), pp. 585-596, 2017. CORE Rank - A*.
• Hui Luo, Farhana M. Choudhury, Zhifeng Bao, J. Shane Culpepper, and Bang Zhang, “MaxBRkNN Queries for Streaming Geo-Data”, International Conference on Database Systems for Advanced Applications (DASFAA), pp. 647--664, 2018.

4. Data visualization

Visualize complex spatial data with efficient data structure

• Supporting Large-scale Geographical Visualization in a Multi-granularity Way (Demo track), Mingzhao Li, Zhifeng Bao, Farhana M. Choudhury, and Timos Sellis, In Proc. of International Conference on Web Search and Data Mining (WSDM), pp. 767-770, 2018. CORE Rank A*.
• Mingzhao Li, Farhana M. Choudhury, Zhifeng Bao, Hanan Samet, and Timos Sellis, “ConcaveCubes: Supporting Cluster-based Geographical Visualization in Large Data Scale”, EG/VCTG Conference on Visualization (EuroVis), pp. 217-228, 2018.
• Interactive Visualization of Urban Areas of Interest: A Parameter-Free and Efficient Footprint Method (Demo track), M Li, Z Bao, F Choudhury, T Sellis, In Proc. of International Conference on Web Search and Data Mining (WSDM), pp. 782-785, 2019. CORE Rank A*.

5. Trajectory data management and queries

GPS- enabled mobile devices and wireless communications generate a large amount of data recording the motion history of moving objects, known as trajectories.

• Top-k trajectories with the best view, NI Tripto, M Nahar, ME Ali, FM Choudhury, JS Culpepper, T Sellis, in GeoInformatica Journal, pp. 1-41, 2019.
• The maximum trajectory coverage query in spatial databases, ME Ali, SS Eusuf, K Abdullah, FM Choudhury, JS Culpepper, T Sellis,Proceedings of the VLDB Endowment 12 (3), 197-209, 2019
• Efficient Multi-range Query Processing on Trajectories, ME Yadamjav, FM Choudhury, Z Bao, H Samet, International Conference on Conceptual Modeling, 269-285, 2018.