| 摘要 |
PROBLEM TO BE SOLVED: To simply map-display the boundary of an administration district lest it is mistaken for a road in any scale. SOLUTION: This invention is provided with an input means (1) for inputting a display scale, a storing means (3) in which polygon map data are stored, a plotting processing control means (4) for reading the polygon map data from the storing means to plot a polygon map, and a display means (6) for displaying output from the plotting processing control means. The plotting processing control means has a function for deciding the unit of the polygon map which has to be plotted to plot the polygon map of the decided unit. |
