Abstract
Visualization of graph data is an active research topic. Several studies of graph data visualization applied dynamics models, molecular models to nodes, and spring models to arcs, to properly place nodes of the graph onto display spaces. This paper proposes an improved force-directed graph data visualization method, and its extension to visualization of hierarchical graph data. The method places nodes of the graph one-by-one, so that it reduces the computation time and improves the display layout. The paper also proposes an application of the method to visualization of Web sites. It maps Web pages as nodes, hyper links as arcs, and directory as hierarchy, to form a hierarchcal graph data. It represents the overview of Web sites by visualizing the hierarchical graph data by above method.
