Abstract: The high energy consumption of electronic map display is one of the problems that needs to be solved urgently in the current map design and application field. Aiming at the problem that the existing electronic map energy-saving display methods are difficult to maintain visual hierarchy, this paper summarizes three visual hierarchy structures of map colors, designs a quantitative expression model for visual hierarchy, and proposes an adaptive energy-saving display optimization method for electronic maps. This method considers both visual hierarchy quality and map energy consumption, defines the map energy saving problem as a “quality-energy consumption” dual-objective optimization problem, uses a heuristic search algorithm to find energy-saving color schemes, and significantly reduces display power consumption with slight changes to map appearance. This method is compared with the semantically-enriched method, and a map reading experiment is designed using electronic maps of different scales. The results show that the proposed method is superior to the comparison method in terms of effectiveness, efficiency and color consistency, and can be widely used in the energy-saving display of electronic maps and mobile navigation maps to improve the battery life of the equipment.

Key words: visual hierarchy, color, energy consumption, electronic map, visual hierarchical quality