The standards of traditional paper map symbols are inapplicable for electronic maps in new display and perception environment. Experimental studies of E-map symbols based on screen visual perception

to make new adaptive standards

are of great importance for E-map standardization

data sharing

adaptive spatial information visualization

and geo-information collaborative visualization. This paper analyzes the various screen sizes and resolutions

and points out that adopting pixel as the unit and GDI+ technique is beneficial for quantificational and artistic symbol design. Its helpful for making the goal clear and enhancing the usability of the experiment that splitting the symbols into meta-graphs from the point of their visual perception and drawing. At last

the authors find out the visual threshold of meta-graphs through the experiments based on E-Prime

and combining with the basic E-map symbol design principles

excellent topographic E-map symbols are acquired.