Previous Seminars

History of the Schedules of CAGIS Seminars (2013 Fall - 2016 Spring)

1) September 5th, 2013

Dr. Wenwu Tang will share with us his recent research work on parallel sensitivity analysis of spatial agent-based models using cutting-edge cyber-enabled high-performance computing capabilities. This article was recently accepted by Annals of AAG, entitled “Global sensitivity analysis of a large agent-based model of spatial opinion exchange: A heterogeneous multi-GPU acceleration approach”.

Dr. Tang will give us a presentation on fundamentals in sensitivity analysis, and how to employ many-core GPUs as a supercomputing platform for computationally intensive spatiotemporal modeling. We will be exposed with the high-performance computing resources we can access for our own research, and possible ways to accelerate spatial analysis and modeling of interest.

2) September 19th, 2013

The topic for this seminar is “Bibliometrics: Measuring Scientific Outputs”. Dr. Xingjian Liu will introduce us the quantitative analysis of scientific and technological literature, and share with us how to identify “hot” research topics. We will learn this useful skill in terms of performing a bibliometric analysis and incorporating this into our own research. 

3) October 3rd, 2013

Dr. Eric Delmelle will share with us his research on visualization of the impact of space-time uncertainties on dengue fever patterns. This paper is recently accepted as pending minor revisions by IJGIS. Eric is an expert in geovisualization. From his talk, we will learn how to apply advanced visualization techniques to help us better present our research work, and enhance our understanding on complex space-time patterns.

4)  October 17th, 2013

Dr. Gang Chen will give a talk about “High-spatial resolution image analysis: Opportunities, challenges and solutions”. This is a very good opportunity for us to get in-depth insight into cutting-edge remote sensing technologies of characterizing and monitoring natural environments.

5)  November 7th, 2013

Dr. Brian Magi will discuss approaches that he and his colleagues are currently using to better understand the drivers of past, present, and future global fire activity.

6) February 5th, 2014

Wenpeng Feng will share with us his recent research on Agent-based simulation of land competition between developers and conservationists: a cyberinfrastructure-enabled approach. We will discuss land change model FUTURES and agent-based modelling approach, as well as smart growth strategy.

7) February 12th, 2014

Jing Deng will discuss her recent research: "A GPU-based Parallel Douglas-Peucker Algorithm for the Acceleration of Automated Line Simplification". She will introduce how to apply data parallelism in line simplification procedure; meanwhile she will share with us some insights of using GPUs in GIS applications. 

8) February 26th, 2014

Alexander Hohl will present his research on "Spatial decomposition of 3D-domain for parallel processing of spatiotemporal disease data". He will lead discussion on the topic how to apply spatial decomposition strategies in parallel computing. The following three articles will be discussed: 

Ding, Y. and Densham, P., 1996. Spatial strategies for parallel spatial modelling. International Journal of Geographical Information Systems, 10 (6), 669–698

Wang, S. and Armstrong, M., 2009. A theoretical approach to the use of cyberinfrastructure in geographical analysis. International Journal of Geographical Information Science, 23 (2), 169–193.

Delmelle, E., Dony, C., Casas, I., Jia, M., & Tang, W. (2014). Visualizing the impact of space-time uncertainties on dengue fever patterns. International Journal of Geographical Information Science, 00(00), 1–21. doi:10.1080/13658816.2013.871285

9) March 12th, 2014

Adam Griffith will discuss his recent research: "The future of the North Carolina and South Carolina coasts: The impact of population dynamics and sea-level rise on land development". He will present current state of SLR(sea-level rise) models, population growth models, and the combination of the two, including traditional raster based “bath tub” models and the Sea Level Affecting Marshes Model SLAMM 6.

10) March 19th, 2014

Huifang Zuo will discuss reinforcement learning and its application in agent-based modeling of spatial cognition in three aspects: evacuation, pedestrian way-findings, and transportations.

11) April 2th, 2014

Jing Deng, Meijuan Jia and Wenpeng Feng will rehearse their presentations on 2014 AAG Annual Meeting.

12) April 16th, 2014

Derek Marsh will give a talk "Uncertainty of Travel Estimates Using Open Geographic Data Providers: Implications for Epidemiological Research".

13) April 23th, 2014

Dr. Elizabeth Delmelle will give a talk about “Neighborhood socioeconomic trajectories, transitions, and sequences”.

14) April 30th, 2014

Coline Dony will give a talk “How to measure accessibility and what is the influence of travel modes on access results? Case study on public parks in Mecklenburg County.”

15) August 27th, 2014

Dr. Wenwu Tang will present a CyberGIS solution, based on the coupling of spatiotemporal and computational thinking, for tackling challenges in big spatial data analytics and geospatial applications in related domains.

This talk is based on his invited panel discussion for the Symposium on Synergistic Advances of CyberGIS and Geography: Roles of CyberGIS and Geography for Turning Big Data to Rich Data and Knowledge on 2014 Annual Meeting of the Association of American Geographers (AAG) in Tampa, FL (panelists: Dr. Harvey Miller (Ohio State University), Wenwu Tang (UNC-Charlotte); discussants: Ming-Hsiang Tsou (San Diego State University), Krzysztof Janowicz (Univ. of California, Santa Barbara), Ed Parsons (Google)).

Dr. Tang is a Geographic Information Scientist specialized in cyber-enabled GIS (CyberGIS), spatiotemporal modeling, and high-performance geocomputation.

16) September 10th, 2014

Dr. Yiannis Proestos will present on 'Global climate simulationsat high resolution: Present and Future Projections of habitat suitability of the Asian Tiger Mosquito'.

Dr. Yiannis Proestos will present recent results  where data from a general circulation climate model  have been used to project the habitat suitability of Ae. albopictus (a vector of viral pathogens) in  recent past and mid-century.

Dr. Proestos is a climate modelling researcher based in Cyprus, working at The Cyprus Institute (CyI) and is currently visiting the Department of Geography and Earth Sciences at UNC Charlotte.

17) September 24th, 2014

Dr. Wenwu Tang will present on 'Massively Parallel Spatial Point Pattern Analysis: Ripley's K Function Accelerated Using Graphics Processing Units'.

Abstract: This study presents a massively parallel spatial computing approach that uses general-purpose Graphics Processing Units (GPUs) to accelerate Ripley’s K function for univariate spatial point pattern analysis. Ripley’s K function is a representative spatial point pattern analysis approach that allows for quantitatively evaluating the spatial dispersion characteristics of point patterns. However, considerable computation is often required when analyzing large spatial data using Ripley’s K function. In this study, a massively parallel approach of Ripley’s K function is developed for accelerating spatial point pattern analysis. GPUs serve as a massively parallel platform that is built on many-core architecture for speeding up Ripley’s K function. Variable-grained domain decomposition and thread-level synchronization are parallel strategies designed to exploit concurrency in the spatial algorithm of Ripley’s K function for efficient parallelization. Experimental results demonstrate that substantial acceleration is obtained for Ripley’s K function parallelized within GPU environments.

Keywords: Spatial Point Pattern Analysis, Ripley’s K function, Parallel Computing, Graphics Processing Units

18) October 8th, 2014

Dr. Eric Delmelle will present on 'A multi-period capacitated school location problem with modular equipment and closest assignment considerations'.

Abstract: In rapidly growing urban areas such as Charlotte, it is deemed vital to expand (or contract) an existing network of public facilities to meet anticipated changes in the level of demand. We present a multi-period capacitated median model for school network facility location planning that minimizes transportation costs, while functional costs are subject to a budget constraint. The proposed Vintage Flexible Capacitated Location Problem (ViFCLP) has the flexibility to account for a minimum school-age closing requirement, while the maximum capacity of each school can be adjusted by the addition of modular units. Non-closest assignments are controlled by the introduction of a parameter penalizing excess travel. The applicability of the ViFCLP is illustrated on a large US school system (Charlotte-Mecklenburg, North Carolina) where high school demand is expected to grow faster with distance to the city center. Higher school capacities and greater penalty on travel impedance parameter reduce the number of non-closest assignments. The proposed model is beneficial to policy makers seeking to improve the provision and efficiency of public services over a multi-period planning horizon.

Keywords: Spatial Optimization, Location Modeling, Public Facility, GIS


19) November 5th, 2014

Dr. Gang Chen will present on 'Sustainable urban forest management: Understanding the role of neighborhood spatial patterns'.

Abstract: Urban development continues to reshape forest landscapes and influence the carbon storage capacity of trees. To date, the impact of urban patterns on forest carbon density remains to be systematically evaluated. A major challenge is the lack of accurate and spatially explicit estimates of forest carbon storage over the entire urbanized area. In this study, we first developed an integrated approach that synergizes remote sensing LiDAR (light detection and ranging) and aerial photography to efficiently model landscape-level forest carbon storage in an urban environment at a fine resolution of 20 meters. Using a case study in the Charlotte Metropolitan Region, USA, we were able to determine the total amount of carbon stored in the local forests to be 3.8 million tonnes ($298 million value), with an average carbon density of 53.6 tonnes per hectare. We further applied statistical analysis to investigate the relationship between urban developed patterns (i.e., landscape metrics) and forest carbon density in four types of residential neighborhoods (categorized by percent built-up ranging from low, medium-low, medium-high to high density). Results indicate a decrease of forest carbon density with an increase of carbon variance in neighborhoods where the intensity of development became higher. Residential neighborhoods with a higher built-up density were more likely to be affected by a larger number of landscape metrics. This indicates that a proper design of the neighborhood level urban spatial patterns (especially in high density neighborhoods) is essential to maximizing forest carbon storage at the landscape level.

20) November 5th, 2014

Dr. Zuo Zhang will present on 'The Spatial Differences, Accessibility and Publicness of Urban Lakes in Wuhan, China: An integrated GIS-based Exploratory Analysis'. (November 19th, 2014).

Abstract: As one of the essential urban open spaces in urban centers, urban lakes usually contribute immensely to the quality of residents' daily lives. Wuhan is a metropolis in central China with over 30 lakes in the downtown. As the urban sprawl of Wuhan city, the urban lakes had polluted, shrank and decreased. For better understanding the spatial relationship between city and urban lakes, the urban lakes in Wuhan were classified into three spatial patterns, and "lakes in urban center" and "lakes in urban fringe" were selected as study objects. By indicators designing, an integrated GIS-based exploratory analysis was made for the spatial differences, accessibility and publicness of urban lakes in Wuhan. Finally, some conclusions were drawn through the analysis and some suggestions were supported for improving the urban planning and management in Wuhan.

21)September 2nd, 2015

Dr. Wenwu Tang will present "Large-scale spatiotemporal land change simulation: Big data and cyberinfrastructure". on Wednesday from 1:00pm to 2:00pm in CAGIS’ collaboration room (McEniry 306).

22) September 16st, 2015

Dr. Elizabeth Delmelle will give a talk:"Mapping the ‘DNA’ of Urban Neighborhoods: Clustering Longitudinal Sequences of Neighborhood Socioeconomic Change". on Wednesday from 1:00pm to 2:00pm in CAGIS’ collaboration room (McEniry 306).

23) September 30st, 2015

Alexander Hohl (Doctoral Student) will give a talk:"Spatiotemporal Domain Decomposition for Massive Parallel Processing of Epidemiological Data".

24) October 14st, 2015

Dr. Jun Zhu will give a talk:"Visual simulation of dam-break flood routing for diversified terminals".

25) October 28st, 2015

Dr. Eric Delmelle will give a talk:"Visualizing the dynamics of health-related tweets opportunities and computational challenges".

26) Novmber 13st, 2015

Dr. Steve Walsh from the University of North Carolina at Chapel Hill will give a talk:"Ecuadorian Amazon to the Galapagos Islands: Modeling Human-Environment Interactions in "Complex" Settings".

25) December 2nd, 2015

Dr. Jiqiang Niu will give a talk "Progressive Generalization Model for Land Use Map: Integrated Semantic Similarity and Spatial Distance"

26) January 27th, 2016

Dr. Wenwu Tang will present "The Assessment of Mangrove Biomass and Carbon in West Africa: A Spatially Explicit Analytical Framework" on Wednesday from1:00pm to 2:00pm in CAGIS’ collaboration room (McEniry 306).

27) February 10th, 2016

Dr. Xinqi Zheng will give a talk:"Methods for determining urban growth boundary in land use planning" on Wednesday from 2:30pm to 3:30pm in CAGIS’ collaboration room (McEniry 306).

28) February 18th, 2016

Dr. Weining Xiang will give a talk:"The Metaphors of Adaptive Cycle and Panarchy: Intellectual Roots and Practical Prospects" on Thursday from 2:00pm to 3:00pm in CAGIS’ collaboration room (McEniry 306).

29) April 19th, 2016

Dr. May Yuan from the University of Texas at Dallas will give a talk: "Geographic Conceptualization for GIS Representation and Analysis" from 11:00am to 12:00pm in McEniry 124.