In a parallel coordinate plot, each variable is graphed on a vertical axis and each data
element is plotted as a connected set of points, one on each axis, as shown by the data element being highlighted in some either either by color, boldness, etc. In this way, parallel coordinate systems can be used to study relationships among many variables or other multivariate data. To show the set of points in a geographic space, a backdrop on the graph is drawn consisting of a number of parallel lines, typically vertical and equally spaced in nature. A point is then represented by a connected series of line segments with vertices on the parallel axis, in which the position of the vertex will relate to the coordinate of the point. The above image is an example of what a parallel coordinate graph looks like, in which each variable is graphed on a vertical axis separated by parallel lines. In this way, parallel coordinate graphs help understand the geometry of multidimensional issues using these visualization techniques.
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