Abstract
Surfaces such as temperature or elevation that can be thought of as continuous in nature are usually represented with isarithm maps or block diagrams. However, these illustration types are often difficult for map readers to interpret. This paper presents a technique for illustrating continuous surfaces with visually smooth tones. Maps were initially produced on a high-resolution, color graphics computer system and were reproduced with conventional process color printing. Surface elevation values are represented with visually smooth changes in tone or hue. Tests of the illustrations evaluated map readers' abilities to interpret surfaces and compared responses to similar isarithm and block diagram representations. Results indicated that subjects performed significantly better on continuous-tone illustrations. These kinds of maps may be a feasible and worthwhile alternative to traditional methods of continuous surface representation.
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