VHDL语言的国际标准，对语言的设计有很大的帮助，供大家参考。-VHDL international standards, the design of the language is very useful for reference.

利用地理绘图软件编写脚本绘制国际IGS站点站位图(Use the geography drawing software to write the scr ipt, draw the international IGS station station bitmap)