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Information Visualisation |
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Inf@Vis!
Parallel coordinates, mainly due to Alfred Inselberg, among others, constitute a relatively recent representation system (ca. 1981). Their objective is to solve the problem of representing multidimensional data sets. They are based on representing each dimension as a vertical scale parallel to all the others. Each element of the data set corresponds to a zigzag line joining the specific values of each one of its variables. This is equivalent to the "point" in a 2 or 3-D representation. At first glance it could seem a complex and even confusing visualization, despite its high conceptual simplicity. Nevertheless an adequate use of the visual variables (colour, transparency...) and of interaction turn them into a powerful tool. The fact that the space we are immersed in is (at least apparently) 3-dimensional makes the representation of multidimensional systems difficult. In a multidimensional system the number of variables that define each of its elements is greater than 3 --see the definition of dimension in the glossary). The representation is increasingly difficult with the higher number of dimensions.... |
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