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Please use this identifier to cite or link to this item: http://hdl.handle.net/10445/5366

Title: Guaranteed Visibility of High-Degree-of-Freedom World Map Software
Authors: Matsuyama, Katsutsugu
Okamoto, Makoto
Abstract: Applications of interactive world maps are one of the most often used classifications of software. Most of the software packages in current use show geographical features mapped directly onto the surface of a sphere or onto a flat surface. To date, most of the studies of user interactions with world maps have only considered two-dimensional maps. This means that data visualization with virtual globe applications has not received much attention. We have proposed a method for displaying world map with high degree of freedom (HDF). The proposed method provided a viewer that combines three-dimensional views, as are normally viewed on a globe, with two-dimensional views, as are seen on an ordinary map and allows seamless switching between the two views. The method uses the series of coordinate systems. Each coordinate system resembles one or another of the coordinate systems used by standard computer graphics, but a key feature is that the parameters of each transformation function depend on the parameters of the other transformation functions and is differing from the direct “browse” style of geometric space in currently available packages. In this paper, we describe a method that the viewing system with the above-mentioned feature guarantees that any region designated by the user can be kept within the borders of the display in order to compare plural geographically distant locations (Figure 1). In this method, the region of interest is indicated by dragging it with the mouse. When the screen cannot show the entire target region, due to use of zoom or other reasons, the algorithm automatically divides the display in order to show the entire region. Guaranteed Visibility ensures that all of the regions displayed on the monitor. First of all, it is verified whether region is displayed or not. If there is a region not being displayed, the system automatically inserts an emulated mouse drag operation in order to shift the region onto the viewable area. If the automatic mouse-drag compensation fails to resolve the problem of the missing region, the display is split, either in the horizontal or the vertical direction, with a 1:1 ratio of the areas of each side. The display splitting is expressed in a tree-structured data. The change from one display mode to another by creation of nodes is a discontinuous process, but an animation is shown during this procedure that makes it look continuous. It has been pointed out that one of the risks of a split display is losing context awareness. We experiment on the use of Halo to provide clues about relative positions to emphasize the relationships between entities in the display.
Research Achievement Classification: 国際会議/International Conference
Type: Conference Paper
Peer Review: あり/yes
Solo/Joint Author(s): 共著/joint
Volume: Article 2-1
Spage: 1
Epage: 6
Date: Jun-2009
Publisher: The Society for Art and Science
Appears in Collections:Matsuyama, Katsutsugu

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