On the basis of analysis of various algorithms,an anti-aliasing algorithm called brush method is presented in this paper,which is suitable to map publishing symbol.

Design and application of the multi-interface map symbol library;

Comparing and analyzing the design method and implementing technique of cartographic symbol base,this paper designs a solution for GIS map symbol library based on_NET.

Firstly, the research and development situations of the map symbol library are summarized.

The Designe and Implementation of a Mapobject Based Special Subject Map Symbol Base;

On the base of analyzing the character and structure of the point、line、area symbols, a data structure of map symbol base which serves the symbolized output in digital mapping is put forward.

The Map Symbol Base System is not only one of the basic functions of Geographic Information System, but also an important research issue in GIS.

This paper presented a basic unit-parameter model for the map symbols based on the existing research on the map symbol database.

First,the paper researched on organizing and accessing mechani sm of map symbol database.

First,the paper researchs organization and more efficient accessing mechanism of multiple map symbol databases.

Through solving key techniques,such as CAD data s semantic translation,block library s communication with common map symbol library,and map symbol s display on multi-platform,synchronous transfer of block information into GIS format in the course of data conversion is realized,CAD block information sharing is achieved.