| In early 1980s, Geographic Information System as a multidisciplinary integrated technology is introduced to the domestic, and has made abundant technical achievements and innovation in geological spatial data integration and spatial decision etc. But because geological space position of the earth's crust, makes many geological problems "black box" features, and makes GIS application's results compared with geography research and space remote sensing relatively lags behind, especially the model of geographical spatial does not apply to geological space model. To further develop GIS, it is necessary to research the evaluation system based on space digital database and mineral resources. At the same time, because of the complexity and interdisciplinary of geological research, the general method of geological Spatial Information Grid (SIG) data processing, ignores the necessary conditions in geological and mineral resources evaluation, that is the connection of the combination of the geological variables ,Spatial structure, and the adaptability measurement of regional comparative , to a certain extent with actual and theoretical defects, and geological space informative, processing trivial, data integration technology to become serious problems to be solved.In view of the above mentioned, the geological field need an information technology platform between the original geological data information and end results, to analysis and processing, fusion, and integration large geological data, construct the geological model, analysis digital features, and comprehensive decision-making, effective second develop geological information, and form hierarchic geological information map.Jilin University's G~4I system is developed based on this idea. G~4I system is the computer system which integration analysis Geological data information such as 4G's data (Geology, Geography, Geochemistry and Geophysics) as kernel, establish geological data analysis method and geological model set to provide services for predicting mineral resources exactly. This system is the digital geological information platform which is based on data integration, data mining and information fusion, and based on geological, geographical, geochemical, geophysics four spatial databases, service in deep crust, integrate spatial information mechanism and model analysis system.Along with the rapid development of scientific technology and informatization, the quantity of data which need collect, store and process also will increase. The content and form of geological spatial data (refer as geological data) is diversified, the problems to be solved is complex, involving numerous fields, using multiple data sources, and the storage formats of kinds of data acquisition and the measure of spatial data are also different. Data integration refers to use various automatic data conversion tool, to make data which has all kinds of sources, formats, characteristic properties organic ground on this system, which can be identified by this system, to provide comprehensive data sharing.Due to the development and popularization of Internet network technology, information sharing is becoming an inevitable trend. Data is the object of system program and the foundation of system construction. Along with the wide application of GIS, socially accumulated large amounts of data resources, each application departments always choose different GIS software platform according to their specific situation, this causes biggish difference in GIS data in structure, model and format, so that geographic data sharing is difficult. Therefore, data integration is an important question we faced. Only the data integration problems are properly resolved, information islands status would be changed, reduce unnecessary repetitive data collection, share data acquisition expenses, make full use of the existing data resources, improve economic efficiency, provide data base such as data sharing and data analysis.This paper according to domestic and foreign research situation, uses G~4I system's metadata, integration technology, spatial data interpretable technology, spatial data feature extraction technology and G~4I system spatial data quality guarantees system, study geological G~4I system data integration of technical problems. The paper briefly specific arrangement and achievements of work are as follows:1.Geological G~4I system overviewThis paper briefly introduces geological G~4I system mainly from theory research contents, geological G~4I system's research object, and geological G~4I system's design content, geological G~4I system's key problems, geological G~4I system's features and geological G~4I system's working platform six parts.2. Data integration technology research situationBased on the vast literature materials, this paper briefly introduces the definition, types requirements, and target of data integration, discusses the theoretical basis, research status and development trend of data integration, analysis the data integration system structure and data integration's key issues.3. Geological G~4I system of metadata and its integration technologyThis paper overviews the definition, contents and functions of metadata, and analyze the standard and the present research status, and emphatically introduces the geological G~4I system metadata design architecture and design content, and establishes the metadata management system, provide solutions of key problems in data integration.4. Sharing and Interoperability Technology of Spatial DataThis part mainly illustrate spatial data sharing from two parts, the introduction of data sharing and ways of implementing spatial data sharing .In addition ,this part briefly introduces the definition of interoperability, methods of spatial data interoperability. In addition, it focus on design of the 4G Geo database in Geo G~4I system and problem of data format conversion and interoperability Technology between the 4G Geo database and spatial data .5. The spatial data feature extraction technologyThis paper introduces the geographic data and geological data pretreatment and geophysical data, the focus of the research is data extraction technology with geochemical exploration.6. The quality guarantee system of Geological G~4I system spatial dataThis section first introduced the concept of spatial data quality, then puts forward the spatial data quality standards, and thereby evaluates the standard of spatial data quality, elaborates the source of spatial data quality problem according to its existence regularity, data quality control based on the error analysis of data source space.Through this paper G~4I system of geological data integration technology research, Integration and information sharing work will lay a foundation of geological G~4I paper in the future, Points out the geological G~4I system about metadata, spatial data and database interoperability between aspects of the development of further part direction, helps the expansion of the system upgrade. At the same time, also hope for similar system development met about data integration issues can have certain reference.
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