DATA STRUCTURE OF GRAPHIC DATA TO BE RECORDED IN ELECTRONIC MAP DATA AND ELECTRONIC MAP DISPLAY DEVICE

摘要

PROBLEM TO BE SOLVED: To reduce capacity of electronic map data.;SOLUTION: When a polygon to constitute an electronic map is plotted, there is hardware in which an upper limit exists in the number of plottable apexes. In order to plot the polygon having apexes exceeding the upper limit number in such hardware, divided segment data to be 'cut lines' for dividing one polygon into a plurality of polygons is defined. Thus, data capacity can be reduced since a plurality o pieces of polygon data are not necessary to be prepared.;COPYRIGHT: (C)2003,JPO