appendix C. glossary 243
Visual variables of symbols. Graphic characteristics of symbols. These include size, shape,
tonal value, hue,
orientation, and pattern.
Visualization. Visualization involves exploration of data and seeing it in different ways. It is
often associated with dynamic visual displays. The goal is insight into the data. Some
animated maps such as “flythroughs” and “flybys” are also called visualizations.
Volume phenomena. Geographical phenomena that extend over areas but can be conceived
of as having a third dimension. The third dimension is a value or quantity.
See also
Statistical surface.
