Drawing the AS graph in two and a half dimensions

We propose a method for drawing AS graph data using 2.5D graph
visualization. In order to bring out the pure graph structure
of the AS graph we consider its core hierarchy. The k-cores are
represented by 2D layouts whose interdependence for increasing
k is displayed by the third dimension. For the core with
maximum value a spectral layout is chosen thus emphasizing on
the most important part of the AS graph. The lower cores are
added iteratively by force-based methods. In contrast to
alternative approaches to visualize AS graph data, our method
illustrates the entire AS graph structure. Moreover, it is
generic with regard to the hierarchy displayed by the third
dimension.