Electronic chart extension symbol construction system based on vector symbol description language

The invention relates to an electronic chart extension symbol construction system based on a vector symbol description language. The system comprises a symbol display and editing module, a symbol graph coding module, a symbol library management module, a vector symbol description language analysis module and a symbol drawing module, wherein the symbol display and editing module can graphically display and edit electronic chart extension symbols; the symbol graph coding module is used for converting a symbol graph to be in the form of a vector symbol description language instruction string fordescription; the symbol library management module organizes, stores and manages symbol data in the form of a standard symbol file; the vector symbol description language analysis module restores the vector symbol description language instruction string of the symbol graph into graph data; and the symbol drawing module quickly draws the symbol graph data to a computer screen for display. Based on the characteristics, the c