Lawrence Livermore National Laboratory



Data Exploration

VisIt allows the ability to provide quantitative as well as qualitative information from a scientific data set.

The line-out creates curves of field values as a function of distance along the line. The first image shows the scalar field and the lines through the data used to create the curves. The second image shows the resulting curves.


The pick operation returns information about selected points including location, cell ID, node IDs, and field values. The first image shows the scalar field and the points that were picked. The pick output window shows the information about the selected points.


VisIt allows you to gather quantitative information from a scientific dataset through queries. A query is a type of calculation that can return values from a dataset or values that are calculated using data from the dataset. Some queries can even be executed for all of the time states in a scientific dataset to yield a Curve plot of the query's behavior over time.


In addition to its many visualization capabilities, VisIt provides a Spreadsheet plot for direct examination of a scientific dataset. The Spreadsheet plot displays data in table format and allows users to slice through 3D data interactively. The visualization window displays a tracer surface showing the source of the data displayed in the table. The spreadsheet appearance can be changed by setting the numeric precision or by coloring the numbers according to a color table.


Explore multivariate data using VisIt's ParallelAxis plot and locate trends and interactions between variables. The ParallelAxis plot can be used with the Extents tool to highlight regions of interest along each variable axis, in effect restricting the data to only the pieces that fit within the defined ranges on each axis. The Extents tool can be used in conjunction with the Threshold operator to show only the pieces of the scientific dataset that match the selected regions in the ParallelAxis plot.


VisIt contains tools to interactively position geometric shapes used by the operators. The first image shows the plane tool, used to interactively position a plane. The second image shows the sphere tool, used to interactively position a sphere. VisIt also includes a box tool, a line tool, a point tool, and an extents tool.


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