Focus+Glue+Context: an improved fisheye approach for web map services

This paper proposes a method for generating a Focus+Glue +Context map for Web map services by improving existing fisheye views methods for cartographic data. While many studies have focused on fisheye views, the problems of the excessively large distortions that maps have over their entire area and/or the high density of roads in the borders of the maps have yet to be resolved. To completely remove the distortions in both the Focus and the Context areas, we propose the inclusion of a Glue area between the two areas. Moreover, we propose the following features. (1) We propose the Dynamic Displacement function to generate a Focus and a Glue having an arbitrary convex or star-shaped polygon. (2) Since the Glue area absorbs all distortion from the Focus and the Context areas, the density of roads along the angular direction of the Glue will be excessively high. To reduce the density of roads, we propose the Following Paths algorithm to display only those roads that are along the radial ...

• Type: Conference
• Year: 2009
• Where: GIS
• Authors: Daisuke Yamamoto, Shotaro Ozeki, Naohisa Takahashi
• Keywords: Context Areas, GIS 2009, Glue Area, Web Map Services