Astrophysics Visualization

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G. M. Machado, F. Sadlo, T. Ertl:

Local Extraction of Bifurcation Lines

In Proceedings of International Workshop on Vision, Modeling and Visualization (VMV), pp. 17–24, 2013.

Abstract

We present local extraction of bifurcation lines together with extraction of their manifolds, a topological feature that has not yet been sufficiently recognized in scientific visualization. The bifurcation lines are extracted by a modification of the vortex core line extraction techniques due to Sujudi-Haimes, and Roth-Peikert, both formulated using the parallel vectors operator. While the former provides acceptable results only in configurations with high hyperbolicity and low curvature of the bifurcation lines, the latter operates only well in configurations with low hyperbolicity but is able to perform well with strong curvature of the bifurcation lines, however, with the drawback that it often fails to provide a solution. We present refinement of the solutions of the parallel vectors operator as a means to improve both criteria and, in particular, to refine the solutions of the Sujudi-Haimes criterion in cases where the Roth-Peikert criterion fails. We exemplify our technique on synthetic data, data from computational fluid dynamics, and on magnetohydrodynamics data. As a particularly interesting application, we demonstrate that our technique is able to extract saddle-type periodic orbits locally, and in case of high hyperbolicity at higher accuracy than traditional techniques based on integral curves.

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Publications

2023
Reviewed Journal Papers
R. Alghamdi, T. Müller, A. Jaspe‐Villanueva, M. Hadwiger, F. Sadlo:
Doppler Volume Rendering: A Dynamic, Piecewise Linear Spectral Representation for Visualizing Astrophysics Simulations
Computer Graphics Forum, vol. 42, no. 3, pp. 39–49, 2023.
Available files: [BibTeX] [DOI] [Details]

2020
Reviewed Journal Papers
A. Sagristà, S. Jordan, F. Sadlo:
Visual Analysis of the Finite-Time Lyapunov Exponent
Computer Graphics Forum, vol. 39, no. 3, pp. 331–342, 2020.
Available files: [BibTeX] [DOI] [PDF] [Video] [Details]

2019
Reviewed Journal Papers
A. Sagristà, S. Jordan, T. Müller, F. Sadlo:
Gaia Sky: Navigating the Gaia Catalog
IEEE Transactions on Visualization and Computer Graphics, vol. 25, no. 1, pp. 1070–1079, 2019.
Available files: [BibTeX] [DOI] [PDF] [Highres PDF] [Video] [Details]

2017
Reviewed Journal Papers
A. Sagristà, S. Jordan, A. Just, F. Dias, L. G. Nonato, F. Sadlo:
Topological Analysis of Inertial Dynamics
IEEE Transactions on Visualization and Computer Graphics, vol. 23, no. 1, pp. 950–959, 2017.
Available files: [BibTeX] [DOI] [PDF] [Highres PDF] [Technical Addendum] [Video] [Details]

Reviewed Conference Papers
R. Peikert, G. M. Machado, F. Sadlo:
Topological Extraction of Escape Maps in Divergence-Free Vector Fields
In Topological Methods in Data Analysis and Visualization IV, Springer International Publishing, pp. 171–186, 2017.
Available files: [BibTeX] [DOI] [Details]

2016
Reviewed Journal Papers
A. Brown, .. ..., A. Sagristà, .. ..., :
Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties
Astronomy & Astrophysics, 2016.
Available files: [BibTeX] [DOI]

T. Prusti, .. ..., A. Sagristà, .. ..., :
The Gaia mission
Astronomy & Astrophysics, 2016.
Available files: [BibTeX] [DOI]

2015
Reviewed Journal Papers
A. Manrique, E. Salvador-Solé, E. Juan, E. Hatziminaoglou, J. M. Rozas, A. Sagristà, K. Casteels, G. Bruzual, G. Magris:
Leaving the Dark Ages with AMIGA
The Astrophysical Journal Supplement Series, vol. 216, no. 1, pp. 13, 2015.
Available files: [BibTeX] [DOI] [Details]

2014
Reviewed Journal Papers
G. M. Machado, F. Sadlo, T. Müller, T. Ertl:
Escape Maps
IEEE Transactions on Visualization and Computer Graphics, vol. 20, no. 12, pp. 2604–2613, 2014.
Available files: [BibTeX] [DOI] [PDF] [Highres PDF] [Details]

2013
Reviewed Journal Papers
M. Ament, F. Sadlo, D. Weiskopf:
Ambient Volume Scattering
IEEE Transactions on Visualization and Computer Graphics, vol. 19, no. 12, pp. 2936–2945, 2013.
Available files: [BibTeX] [DOI] [PDF] [Details]

Reviewed Conference Papers
G. M. Machado, F. Sadlo, T. Ertl:
Local Extraction of Bifurcation Lines
In Proceedings of International Workshop on Vision, Modeling and Visualization (VMV), pp. 17–24, 2013.
Available files: [BibTeX] [DOI] [PDF] [Details]

2012
Reviewed Conference Papers
G. M. Machado, F. Sadlo, T. Müller, D. Müller, T. Ertl:
Visualizing Solar Dynamics Data
In Proceedings of International Workshop on Vision, Modeling and Visualization (VMV), pp. 95–102, 2012.
Available files: [BibTeX] [DOI] [PDF] [Technical Addendum] [Video] [Details]