Self-adjusting legends for proportional symbol
maps
Jenny, B., Hutzler, E. and Hurni, L.
Cartographica, 44-4, p. 301–304, 2009.
Paper
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Abstract
Legends for proportional symbol maps
normally show the largest and the smallest symbols on the
map, along with selected intermediate symbols. This short
article presents automatic self-adjusting legends that show
visually equally spaced symbols, if possible at round
values. The number of intermediate symbols is automatically
adjusted to the size of the legend. The method can be
applied to any symbol size, to mathematical and perceptual
scaling of the symbol size, to any geometric or
pictographic symbols, and to arbitrary value ranges,
including very large or very small minimum and maximum
values. Self-adjusting legends are well suited to a variety
of mapping applications that represent numerical data as
graduated symbol maps, such as desktop GIS or online
mapping systems and atlases.
