Minimum dimensions for cartographic symbology – history, rationale and relevance in the digital age

Abstract

This paper compiles guidelines for minimum dimensions of cartographic symbology from the literature on map design for printed and digital maps. Such minimum dimensions are relevant not only for the design of cartographic symbology, but also as fundamental parameters affecting the visual hierarchy of the overall map and the cartographic generalization of its elements. However, this review shows that only few studies have actually verified minimum dimensions in controlled empirical experiments, and most authors seem to have based their recommendations on anecdotal evidence or theoretical considerations only. Conclusions for a future research agenda in cartography, ranging from ethical questions to calls for empirical research on minimum dimensions, are drawn from the presented findings.