360 Geog April 17, 2006 Readings for this week: Chapter 16 and section 4.3, 4.4, 4.5 in the Slocum. 1. Enhancing visual hierarchy on the map Making the use of Gestalt theory to help separate figure from ground Visual difference, detail, edge, layering, proximity, size, and surroundness 2. Kinds of numerical data and color scheme (reading: slocum 13.3.1) Unipolar data: use sequential scheme Bipolar data: use diverging scheme 3. What is proportional symbol mapping? Represent numerical data value associated with point location Symbol size is scaled in a way that reflects data value magnitude 4. What are three scaling methods? Mathematical symbol scaling: in direct proportion to data value magnitude Perceptual scaling: adjusted to human underestimation of size (i.e. make it larger than the symbol size in proportion to the actual data value) Range-graded scaling: "classed" method 5. Design consideration in proportional symbol mapping Does the map fit into the appropriate models of geographic phenome...