Perception of Perspective Block Diagrams

Abstract

With sophisticated computer technology an infinite number of perspective maps can be produced to represent one continuous statistical surface. This presents the cartographer with a dilemma: Which view most clearly conveys the intended message? Two hundred twenty-five subjects were tested on their perception of height and distance relationships using 15 perspective block diagrams, all representing one statistical surface but varying on two parameters, altitude and cone of vision. The map readers were remarkably consistent in their perception of a surface from the various views presented. No one map communicated more accurate infonnation than another overall. By recognizing the test map as a perspective representation of a three-dimensional surface, the map reader was able to compensate for distortion along the x,y,z axes. Perspective block diagrams are not only a viable technical solution to the problem of mapping a continuous statistical surface but are also effective thematic maps.