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ADAPT: Adaptive Thresholds for Feature Extraction

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Topological Methods in Data Analysis and Visualization IV (TopoInVis 2015)

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Abstract

Threshold-based feature definitions remain one of the most widely used and most intuitive choice in a wide range of scientific areas. However, it is well known that in many applications selecting a single optimal threshold is difficult or even impossible. Common examples of this are quantities with locally exponential behavior like the scalar dissipation rate in turbulent combustion simulations or indicator functions, such as, vorticity or delta popular in defining vortices. In these cases, local thresholds defined, for example, using contour trees can provide significantly better results, but typically require a data analysis expert to create and use. We present the ADAPT framework a new open source code that transforms a given scalar field such that global thresholds in the resulting field correspond to a variety of local thresholds in the original data. Consequently, the resulting field can be easily processed using any of the existing tool chains and provides scientists easy access to a wide variety of more advanced feature definitions. Currently, the package provides two techniques to define local thresholds: The relevance transform originally developed for combustion analysis and a model based fit initially designed to extract eddies in global ocean simulations. Furthermore, it provides an extendable API to easily add other transforms.

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Acknowledgements

This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Advanced Scientific Computing Research, Scientific Discovery through Advanced Computing (SciDAC) program. This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344. UCRL LLNL-CONF-681469.

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Correspondence to Peer-Timo Bremer .

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Bremer, PT. (2017). ADAPT: Adaptive Thresholds for Feature Extraction. In: Carr, H., Garth, C., Weinkauf, T. (eds) Topological Methods in Data Analysis and Visualization IV. TopoInVis 2015. Mathematics and Visualization. Springer, Cham. https://doi.org/10.1007/978-3-319-44684-4_18

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