New Visualization of Surfaces in Parallel Coordinates  Eliminating Ambiguity and Some "OverPlotting"
Abstract
$\cal{A}$ point $P \in \Real^n$ is represented in Parallel Coordinates by a polygonal line $\bar{P}$ (see \cite{Insel99a} for a recent survey). Earlier \cite{inselberg85plane}, a surface $\sigma$ was represented as the {\em envelope} of the polygonal lines representing it's points. This is ambiguous in the sense that {\em different} surfaces can provide the {\em same} envelopes. Here the ambiguity is eliminated by considering the surface $\sigma$ as the envelope of it's {\em tangent planes} and in turn, representing each of these planes by $n$1 points \cite{Insel99a}. This, with some future extension, can yield a new and unambiguous representation, $\bar{\sigma}$, of the surface consisting of $n$1 planar regions whose properties correspond lead to the {\em recognition} of the surfaces' properties i.e. developable, ruled etc. \cite{hung92smooth}) and {\em classification} criteria. It is further shown that the image (i.e. representation) of an algebraic surface of degree 2 in $\Real^n$ is a region whose boundary is also an algebraic curve of degree 2. This includes some {\em nonconvex} surfaces which with the previous ambiguous representation could not be treated. An efficient construction algorithm for the representation of the quadratic surfaces (given either by {\em explicit} or {\em implicit} equation) is provided. The results obtained are suitable for applications, to be presented in a future paper, and in particular for the approximation of complex surfaces based on their {\em planar} images. An additional benefit is the elimination of the ``overplotting'' problem i.e. the ``bunching'' of polygonal lines which often obscure part of the parallelcoordinate display.
 Publication:

arXiv eprints
 Pub Date:
 March 2004
 arXiv:
 arXiv:cs/0403004
 Bibcode:
 2004cs........3004I
 Keywords:

 Computer Science  Other;
 Condensed Matter  Other;
 F.2.1.;
 I.1.1
 EPrint:
 13 pages 8 figures