Transformation of a Sketch Map Laying over a Metric Map on the Web

Abstract—A sketch map is a type of non-metric map that is widely used for navigation and guidance. It is easy to understand, but the positions of geographical objects are not always accurate. This paper proposes a method to overlay a sketch map on a metric map so that each important object on the sketch map is located at the accurate position on the metric map. The method deforms the sketch map globally and locally with affine transformations, as well as adjusting the scale and heading of the metric map. By this way, users can get the best of both sketch maps that are easy to understand and metric maps that are accurate on locations. Our evaluation using 100 sketch maps on web pages demonstrates the effectiveness of the proposed method.

Index Terms—Geographical information systems, map overlay, map transformation, metric maps, sketch maps.

Ryoto Kitajima was with Graduate School of Engineering, Tokyo Denki University, Tokyo, Japan. He is now with CyberAgent Inc., Tokyo, Japan (e-mail: kitajima.ryoto@gmail.com).
Ushio Inoue is with Tokyo Denki University, Tokyo, Japan (e-mail: inoue@c.dendai.ac.jp).

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Cite: Ryoto Kitajima and Ushio Inoue, "Transformation of a Sketch Map Laying over a Metric Map on the Web," Lecture Notes on Software Engineering vol. 2, no. 3, pp. 218-224, 2014.