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Off-Screen Landmarks on Mobile Devices: Levels of Measurement and the Perception of Distance on Resized Icons

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Abstract

While bringing portability and convenience to their users, the small screen size of mobile devices raises the concern that it might impact a user’s acquisition of spatial knowledge. Visualizing information of off-screen objects on mobile device has thus been introduced as a possible way to overcome this problem. Some approaches encode the distance to off-screen objects very well, but they have not considered the identities of objects, which could serve as easily-recognizable landmarks of recognition. Other approaches have addressed the visualization of distant objects’ identities as landmarks, but they have not considered the representation of distance to their actual locations. Following these approaches, this study introduces the use of visual variable size in the design of symbols for off-screen landmarks to translate both information about both direction and distance. To further investigate the efficiency of using these graduated size symbols, we apply ratio and ordinal levels of measurement to assign size to the symbols. Results show, size at the ordinal level leads to higher efficiency in understanding distance to off-screen locations. Both designs, however, yield challenges in participants’ understanding of distance based on the symbol’s size. As the initial step of investigating the use of visual variables in the design of symbols for off-screen landmarks, we suggest more visual variables be considered in follow-up designs to provide a more comprehensive understanding regarding the effectiveness of visualizing off-screen landmarks on mobile devices.

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(Sources: Overview + Detail, Scaled arrow, and Wedge [4]; Halo [24])

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Correspondence to Rui Li.

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Li, R., Zhao, J. Off-Screen Landmarks on Mobile Devices: Levels of Measurement and the Perception of Distance on Resized Icons. Künstl Intell 31, 141–149 (2017). https://doi.org/10.1007/s13218-016-0471-7

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