EnvirVis15

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

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Browsing EnvirVis15 by Subject "Applications"

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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    Spatial Aggregation of Mobile Transect Measurements for the Identification of Climatic Microenvironments
    (The Eurographics Association, 2015) Häb, Kathrin; Middel, Ariane; Ruddell, Benjamin L.; Hagen, Hans; A. Middel and K. Rink and G. H. Weber
    Mobile transect measurements retrieve high-resolution observations revealing the spatial variation of atmospheric properties throughout an urban landscape. A sensor platform is moved through a study site with varying urban form, collecting a data set that can be used to investigate the multifaceted impacts of different building and landscape configurations on atmospheric properties. To generalize such findings, it is imperative to include transect runs representing different points in time and potentially different meteorological background conditions. However, the analysis of a set of mobile transect measurement runs is challenging because of the strict spatio-temporal dependence and multivariate nature of each recorded sample. In this study, we provide visual support for the identification of coherent climatic microenvironments within a study site using mobile transect measurements taken at different points in time and over diverse routes. A regular grid is used to spatially aggregate the data, and resulting summaries are classified according to similar multivariate relationships using clustering techniques. Finally, each grid cell is visualized using a radial glyph encoding cluster membership, predominant wind direction for each transect run, and the number of transect runs traversing this grid cell. The approach has been tested using a data set recorded in Gilbert, Arizona, USA, and it shows potential to identify spatially contiguous regions of similar microclimate.
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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.