Abstract
The size of letters used in GIS greatly affects legibility of map labels. To provide a criterion for the size of letters to keep legibility at a certain level, this paper analyzes the relationship between the size of letters and the loss of literal information. The amount of information loss is measured by two different indices: a visibility ratio that indicates the ratio of visible letters to total letters, and a legibility ratio that represents the ratio of legible letters to total letters. The expectations of these indices are represented as functions of the size of letters, and it is possible to estimate the loss of literal information when the size of letters is determined. To test the validity of this analysis, it is applied to the labelling of station names in Yokohama City, Japan. Some empirical findings are shown.
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