EnvirVis15

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https://diglib.eg.org/handle/10.2312/12460

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Browsing EnvirVis15 by Subject "I.3.8 [Computer Graphics]"

Now showing 1 - 4 of 4
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    An Interactive Web-Based Geovisual Analytics Tool to Explore Water Scarcity in Niger River Basin
    (The Eurographics Association, 2015) Lei, Ting L.; Liang, Xing; Mascaro, Giuseppe; Luo, Wei; White, Dave; Westerhoff, Paul; Maciejewski, Ross; A. Middel and K. Rink and G. H. Weber
    Assessing the needs for adaptation and mitigation strategies to climate change and variability in Niger River Basin is a key for future development in Western Africa. There are two major challenges in terms of the assessment: the first is that future projections in water availability based on the historical trends are hard to assess under uncertainty, and the second is that human activities and population growth play a decisive but very uncertain role in environmental impacts. In order to address both challenges, we have developed a geovisual analytics tool for exploring simulation results under combinations of climate models, climate policies, and future population growth. Moreover, our tool is capable of ensemble-visualization and allows users to explore agreement levels among different climate models to assess future uncertainty.
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    Real-Time Visualization of Urban Flood Simulation Data for Non-Professionals
    (The Eurographics Association, 2015) Grottel, Sebastian; Staib, Joachim; Heyer, Torsten; Vetter, Benjamin; Gumhold, Stefan; A. Middel and K. Rink and G. H. Weber
    Perception and understanding of risk in predictive flood simulation data is a key factor in flood risk management. However, scientific visualizations are often hard to grasp for non-professionals. We present a visualization tool for interactive, realistic flood water rendering, incorporating a variety of optical effects. Our implementation is based on state-of-the-art algorithms of interactive computer graphics using animated texture coordinates. The flood simulation data contains water depth level and a flow field. Together with terrain elevation and buildings our tool allows for natural understanding of the data. We maintain interactive frame rates on standard desktop computers. Our results were judged useful by average citizens and political decision makers.
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    VafusQ: A Visual Analytics Application with Data Quality Features to Support the Urban Planning Process
    (The Eurographics Association, 2015) Triana, John A.; Zeckzer, Dirk; Hernandez, Jose T.; Hagen, Hans; A. Middel and K. Rink and G. H. Weber
    Fast changing urban systems pose huge challenges for planners and governments. One major challenge is to provide optimized facilities systems fulfilling all the basic citizen needs such as food, education, security, and health. To provide these, the deficit of the complete system needs to be analyzed and quantified. An additional, important problem is the quality of the underlying data influencing the analysis. Often, the data is, e.g., incomplete, not accurate, or not reliable. The goal of this paper is to support the analysis of the deficit for the facilities system of Bogotá by taking into account data quality issues. Our contributions are: the inclusion of data quality in the urban planning process, the design of a novel visualization technique to represent data quality, the implementation of an application to support the analysis of the facilities system, and a case study with experts assessing the usability and usefulness of the application. As a conclusion, the experts find the application useful for the analysis tasks and the inclusion of data quality features important and comprehensible.
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    Web-Based Visualization of the Global Change Assessment Model
    (The Eurographics Association, 2015) Luo, Wei; Chang, Zheng; Kong, Lilian; Link, Robert; Hejazi, Mohamad; Clarke, Leon; Maciejewski, Ross; A. Middel and K. Rink and G. H. Weber
    The Global Change Assessment Model (GCAM) is an integrated assessment tool for exploring consequences and responses to global change. However, the current iteration of GCAM relies on NetCDF file outputs which need to be output from the model and then exported for visualization and analysis purposes. Such a requirement limits the uptake of this modeling platform for analysts that may wish to explore future scenarios. In this work, we present a web-based geovisual analytics interface for GCAM. Challenges of this work include enabling both domain expert and model experts to be able to functionally explore the model. We explore the use of various aggregation layers, coordinated views and how choices of icons can enhance the understanding of the underlying data. Our primary focus is on understanding the simulated impact of climate change on sectors of the global economy. To demonstrate our work, we present a case study which explores the potential impact that the China south-north water transportation project in the Yangtze River basin will have on projected water demands.