We present a novel tree browser that builds on the conventional node link tree diagrams. It adds dynamic rescaling of branches of the tree to best fit the available screen space, optimized camera movement, and the use of preview icons summarizing the topology of the branches that cannot be expanded. In addition, it includes integrated search and filter functions. This paper reflects on the evolution of the design and highlights the principles that emerged from it. A controlled experiment showed benefits for navigation to already previously visited nodes and estimation of overall tree topology.

In this paper we review studies of the growth of the Internet and technologies that are useful for information search and retrieval on the Web. We present data on the Internet from several different sources, e.g., current as well as projected number of users, hosts, and Web sites. Although numerical figures vary, overall trends cited

This paper describes major concepts of a scalable information visualization framework. We assume that the exploration of heterogenous information spaces at arbitrary levels of detail requires a suitable preprocessing of information quantities, the combination of different graphical interfaces and the illustration of the frame of reference of given information sets. The innovative features of our system include dynamic hierarchy computation and user controlled refinement of those hierarchies for preprocessing unstructured information spaces, a new Focus+Context technique for visualizing complex hierarchy graphs, a new paradigm for visualizing information structures within their frame of reference and a new graphical interface that utilizes textual similarities to arrange objects of high dimensional information space in 3-dimensional visualization space.

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We present a new visualization technique, called (Reconfigurable Disc Tree) which can alleviate the disadvantages of cone trees significantly for large hierarchies while maintaining its context of using 3D depth. In, each node is associated with a disc around which its children are placed. Using discs instead of cones as the basic shape in has several advantages: significant reduction of occluded region, sharp increase in number of displayed nodes, and easy projection onto plane without visual overlapping. We show that can greatly enhance user perception by transforming its shapes dynamically in several ways: (1) disc tree which can significantly reduce the occluded region by the foreground objects, (2) compact disc tree which can increase the number of nodes displayed on the screen, and (3) plane disc tree which can be mapped onto the plane without visual overlapping. We describe an implementation of our visualization system called VISIT (Visual Information System for reconfigurable dIsc Tree). It provides 2D and 3D layouts for and various user interface features such as tree reconfiguration, tree transformation, tree shading, viewing transformation, animation, selection and browsing which can enhance the user perception and navigation capabilities. We also evaluate our system using the following three metrics: percentage of occlusion, density of displayed nodes on a screen. number of identifiable nodes. Key Words and Phrases: Information visualization, disc tree, compact disc tree, plane disc tree, hierarchy.

Our work focuses on the design of interaction techniques for large information spaces. Our goal is not to define yet another visualization technique but to provide insights for the design of such techniques. Our design approach is based on ergonomic criteria that arose from a study of how the user perceives and manipulates a large information space. We then provide design rules that should help the designer in devising an interaction technique that verifies the ergonomic criteria. After the design of the interaction technique, the next step is software design. We establish links between our design rules/ergonomic criteria and the software architecture model. By applying our PACAmodeus model, we show how the software architecture model helps to either verify or assess the ergonomic criteria. We therefore adopt a predictive evaluation approach to the design of interaction techniques for large information spaces. We illustrate our design approach and results through our VITESSE system. K...

This paper presents work in progress on our approach to visualizing multi-dimensional and hierarchical information. We propose two new graphical user interfaces, the Magic Eye View (MEV) and ShapeVis to explore information spaces. In order to cope with large information sets we combine MEV and ShapeVis with dynamic hierarchical clustering of information units. The Magic Eye View, which implements a new Focus+Context technique, is used as the interface for visualizing those hierarchies. In order to support detailed exploration of the information space (e.g. analysis of certain cluster nodes or hierarchy levels) a new technique for visualizing multidimensional information is used. ShapeVis provides 2D or 3D representations of the information objects according to the selected subset of the information space. Objects are represented as small closed free-formsurfaces. The location, size and shape of these surfaces describe the original objects in the information space uniquely ...

This report is broken down into four main sections, firstly giving the primary aims of the proposed research, followed by a review of background reading of present Information Visualisation (IV) techniques, which are categorised using an existing framework. This is followed by a description of the general visualisation problem we are concerned with plus a description of the specific area where such a visualisation could be of benefit. We then discuss the visualisation techniques that address situations that have the greatest similarity to our own problem, and explain why they still lack suitability for our purposes. Then, two prototypes that are under development are described, and the report finishes with a breakdown of proposed future work

This paper examines the problems inherent in navigating the World-Wide Web. It discusses the work done by others in crafting techniques, software products, and research prototypes that attempt to improve the browsing experience through the application of information visualization in the form of sitemaps. This paper also describes an animated technique to generate previews and overviews of a web site in order to get a better understanding of its contents. The final section includes a technical description of an early prototype tool that uses this animated technique, with preliminary findings from an informal feasibility study involving 19 subjects. Keywords Web browsing; alternative user interfaces; web navigation; previews; overviews; web crawler; searching Context and Problem Statement The World-Wide Web is a constantly evolving maze of HTML, DHTML, XML, Java, JavaScript, CGI, Active Server Pages, Shockwave, Flash, and other means of generating hypertext content. It is an extremely ...

Information Visualization (InfoVis) encompasses techniques of visualization that deal primarily with abstract data, that is, data for which the user has no preconceived mental model. This is in contrast to, for example, volume or flow data.