The Study of GIS Based on Windows DNA

The quick development of GIS technology and thecomplication of software exert higher requirements on second developers. By using architecture of Windows DNA, the reusability of software can be improved,the system model can be simplified and the process of software development canbe accelerated. This paper discusses the functions of Windows DNA, the development and application of COMGIS as well as the method for realization of 3-tier architecturebased on Windows DNA. Finally, an example of such model is introduced. The result showsit exceeds traditional methods in system maintainability and extensibility.