ActiveGraph: A digital library visualization tool

ActiveGraph is an information visualization tool designed to provide users with a concise, customizable view of objects in a digital library. A set of digital library objects is represented as a data set in a two- or three-dimensional scatter plot. The data set can represent any digital library objects in any medium: books, journals, papers, images, Web resources, or even entire databases. Since ActiveGraph is intended for use in the context of digital libraries, data attributes consist for the most part of metadata fields such as title, author, date of publication, and number of citations. Data attributes are mapped to six visual attributes of the scatter plot: the X-, Y-, and Z-axes, color, size, and shape. The metadata for a selected data point are displayed in a control panel on the right-hand side of the screen. Users can edit the metadata and even add new metadata fields. Thus ActiveGraph allows users to both view and customize the contents of a library. Because of its flexibility in handling digital library objects and metadata of different types, ActiveGraph can be used in a variety of digital library applications. In this paper, we describe two: LibGraph, which is a visualization of a collaborative library, and CiteGraph, which is a visualization of citation statistics. Both applications were designed for use by scientists and engineers, for whom scatter plots are familiar and intuitive visualizations.

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