Proposed several methods of graphic display to extract the characteristics of periodic movements of atmospheric monitoring data.
Some visual patterns can be recognized by use of the appropriate matrix construction of the data on a picture.
The data are divided into several levels by the thresholds such as the environmental quality standards or the percentiles (75 percentile and 90 percentile are recommended). And those levels are assigned to the gray scales or the adequate color codes.
In a matrix for the display of one month data, “hour” is selected as a column, and “day” or “day of the week” is selected as a row. Displaying the matrix, some features of periodic movement of hourly averages, for examples, of oxidant and nitrogen oxides concentration were recognized. Using a similar method, the relation of the simultaneous movements of two kinds of pollutants such as NO and NO2 could be obtained synoptically on a color graphic display. The characteristics of the data of a pollutant in a year, and the features of the occurrences of missing data are also obtained by constructing the appropriate matrices on a display.
An architecture of the computer system for the graphic display by these methods is also represented.