Adaptability of atlas symbol sizes under multivariate conditions

ABSTRACTAtlases contain a large number of maps, and their design requires unity and coordination. When designing map symbol sizes, we must consider not only the requirements of single maps, but also the coordination of the whole atlas. Changing the map scales and statistical unit resolution alters the visual perception of maps, even if the symbols are unchanged. Therefore, appropriate and coordinated atlas symbols are required. This paper analyzes the main factors influencing the symbol design of the National Economic Atlas of China, establishes a visual-variable system of atlas symbols, and models the variable combinations and sizes of experimental symbols. It also analyzes 592 experimental maps and constructs an adaptability evaluation model of map symbol sizes under multivariate conditions. By relating the appropriate symbol sizes to the thematic data, we formulate the symbol size under multivariate conditions, thereby improving the standardization of symbol design in the National Economic Atlas of China.