TY - JOUR
T1 - Analysis of uncertain scalar data with hixels
AU - Levine, Joshua A.
AU - Thompson, David
AU - Bennett, Janine C.
AU - Bremer, Peer Timo
AU - Gyulassy, Attila
AU - Pascucci, Valerio
AU - Pébay, Philippe P.
N1 - Publisher Copyright:
© Springer-Verlag London 2014.
PY - 2014
Y1 - 2014
N2 - One of the greatest challenges for today’s visualization and analysis communities is the massive amounts of data generated from state of the art simulations. Traditionally, the increase in spatial resolution has driven most of the data explosion, but more recently ensembles of simulations with multiple results per data point and stochastic simulations storing individual probability distributions are increasingly common. This chapter describes a relatively new data representation for scalar data, called hixels, that stores a histogram of values for each sample point of a domain. The histograms may be created by spatial down-sampling, binning ensemble values, or polling values from a given distribution. In this manner, hixels form a compact yet information rich approximation of large scale data. In essence, hixels trade off data size and complexity for scalar-value “uncertainty”.We summarize several techniques for identifying features in hixel data using a combination of topological and statistical methods. In particular, we show how to approximate topological structures from hixel data, extract structures from multi-modal distributions, and render uncertain isosurfaces. In all three cases we demonstrate how using hixels provides the capability to recover prominent features that would otherwise be either infeasible to compute or ambiguous to infer. We use a collection of computer tomography data and large scale combustion simulations to illustrate our techniques.
AB - One of the greatest challenges for today’s visualization and analysis communities is the massive amounts of data generated from state of the art simulations. Traditionally, the increase in spatial resolution has driven most of the data explosion, but more recently ensembles of simulations with multiple results per data point and stochastic simulations storing individual probability distributions are increasingly common. This chapter describes a relatively new data representation for scalar data, called hixels, that stores a histogram of values for each sample point of a domain. The histograms may be created by spatial down-sampling, binning ensemble values, or polling values from a given distribution. In this manner, hixels form a compact yet information rich approximation of large scale data. In essence, hixels trade off data size and complexity for scalar-value “uncertainty”.We summarize several techniques for identifying features in hixel data using a combination of topological and statistical methods. In particular, we show how to approximate topological structures from hixel data, extract structures from multi-modal distributions, and render uncertain isosurfaces. In all three cases we demonstrate how using hixels provides the capability to recover prominent features that would otherwise be either infeasible to compute or ambiguous to infer. We use a collection of computer tomography data and large scale combustion simulations to illustrate our techniques.
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U2 - 10.1007/978-1-4471-6497-5_3
DO - 10.1007/978-1-4471-6497-5_3
M3 - Article
AN - SCOPUS:84921382516
SN - 1612-3786
VL - 37
SP - 35
EP - 44
JO - Mathematics and Visualization
JF - Mathematics and Visualization
ER -