Associate Professor, University of Utah
We introduce several useful utilities in development for the creation and analysis of real wildland fire simulations using WRF and SFIRE. These utilities exist as standalone programs and scripts as well as extensions to other well known software.
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In this paper, we first identify frequently occurring types of uncertainty. Second, we connect those uncertainty representations to ones commonly used in visualization.We then look at various approaches to visualizing this uncertainty by partitioning the work based on the dimensionality of the data and the dimensionality of the uncertainty, and we discuss noteworthy exceptions to our taxonomy along with future research directions for the uncertainty visualization community.
Continue readingWe propose to aid the interactive visualization of time-varying spatial datasets by simplifying node position data over the entire simulation as opposed to over individual states. Our approach is based on two observations. The first observation is that the trajectory of some nodes can be approximated well without recording the position of the node for every state. The second observation is that there are groups of nodes whose motion from one state to the next can be approximated well with a single transformation. We present dataset simplification techniques that take advantage of this node data redundancy.
Continue readingRTW is an efficient method for adaptively sampling a shadow map using a set of user/developer-defined heuristics. RTW is both memory and computationally efficient, delivering exceedingly high-quality results in real-time.
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We demonstrate the application of topological analysis techniques to the rather unexpected domain of software visualization. We use topological persistence to automatically detect significant circular structures in the point cloud, which represent recurrent or cyclical runtime program behaviors.
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In this work, we present our experiences in disseminating the results of two studies to national audience. The resulting visualizations and press releases allowed the studies’ researchers to educate a national, if not global, audience.
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This paper shows that images constructed with non-pinhole cameras improve approximation quality at little additional cost provided that the non-pinhole camera offers fast projection. We demonstrate the advantages of non-pinhole depth images in the context of reflections, refractions, relief texture mapping, and ambient occlusion.
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We present a system for visualizing memory reference traces, the records of the memory transactions performed by a program at runtime. The visualization consists of a structured layout representing the levels of a cache and a set of data glyphs representing the pieces of data in memory being operated on during application runtime.
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Multiperspective images (MPIs) show more than what is visible from a single viewpoint and are a promising approach for alleviating the problem of occlusions. We present a comprehensive user study that investigates the effectiveness of MPIs for 3-D scene exploration. The results of our experiments show that MPIs can greatly outperform conventional images.
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In this paper we introduce the curved ray camera to address the single viewpoint limitation. Rays are C1-continuous curves that bend to circumvent occluders, and our camera is designed to provide a fast 3-D point projection operations.
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