This paper presents a streamline selection technique for integrated scalar and vector field visualization. The technique visualizes a scalar field by multiple semitransparent isosurfaces, and a vector field by multiple streamlines, while the technique adequately selects the streamlines considering reduction of cluttering among the isosurfaces and streamlines. The technique first selects and renders interesting isosurfaces. It then temporarily generates a lot of streamlines from randomly selected seed points. The technique evaluates each of the streamlines according to their visibility, and selects the specified number of highly evaluated streamlines. Consequently, the technique visualizes scalar and vector fields simultaneously, by isosurfaces selected from non-view-dependent perspective, and streamlines selected from view-dependent perspective.

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This paper describes the research and development of a new tool for visualizing world maps. The developers anticipate this tool will provide a better grasp of structures and enable an improved understanding of features from multiple viewpoints. The following needs were identified on the basis of interviews with subjects who are likely users of map software: overhead views and true-to-life views; side-by-side comparison of arbitrarily selected locations; and context awareness. The software was designed to satisfy these requirements by incorporating a new algorithm, resulting in a package with distinctly different characteristics from those that are browsed in a directly geometric fashion. In this paper, we propose a viewing system that allows the user to switch seamlessly between different geographical projections and a multi-focus view displaying method by parameter adjustment and split screen. The effectiveness of this approach is validated in a survey of subjects using this mapping software.

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