Geographic Information Sharing In Data Conversion Technology And Methods

With the proliferation of the data information and the tools of GIS, government, business enterprise and military sections bear more and more pressure, and it becomes more and more important for them to integrate and use geographic information data from various data source.This paper discusses the purpose and the meaning of this research, analyzes the actuality of the research of the geographic information sharing all over the world, studies on three aspect of commence content of geographic information sharing:1, The research of the common data meaning conversion model, namely the problem of the conversion of two kinds of data of different data coding. Mainly solving the problem of the semantic correspondence of the data of the digital map, finishing the work of the conversion of data cognition, and obtaining the data sharing at the level of cognition.2, The research of the common data coordinate conversion model, namely converting the data from one reference frame to another reference frame through controlling the parameter of data conversion model, finishing the work of the conversion of position system of data, and obtaining the data sharing at the level of space. The conversion of coordinate model includes the conversion of geography coordinate system and the conversion of projection system.3, The research of the data format conversion model, namely converting the data from one logic definition of the data to another logic definition, finishing the work of the conversion of spatial relation and logic relation of data, and obtaining the data sharing between different software system.The paper gets the result that studying the spatial data sharing is the common desire of the applications of the geographic information and is the important part of the work of information analyze through analyze and research. Based on this the paper mainly do some work on studying the building of the data models and the interpretation of these models according to the situation of the geographic information data and it's applications.