Study On The Rules Of Constructing Spatial Database For Regional Hydrogeological Maps

As the basic and nonprofit information, the regional hydrogeology survey results play an important role in reasonable land resources use, national economic development, regional development plan and geological environment protection, and it will produce long-term economic and social benefits. The technology of spatial database, the core technology of the Geography Information System (GIS), provides an effectual way for sharing the hydrogeological information with community and society, and the quality of spatial data will affect the development of spatial database. It has important meanings to construct spatial hydrogeological database that takes the paper maps and spatial data as data sources, takes the GIS as main technology, and takes service for public community as the main aim.Based on the spatial database technology supported by the software of MAPGIS, the present work takes the characters of hydrogeological information as study subject, and the aim is to solve the technical problems of transforming the paper information of regional hydrogeology to the digital information, and to provide some rules of the mathematic precision control, the data integrity, the logical consistency and the data quality control during the process of constructing the spatial database of regional hydrogeological maps. Based on the comprehensive analysis of present study status of hydrogeology informationization, the characters of hyrogeological information were studied in detail, such as data integration, data spatial distribution, dynamic and real-time data, opening character, data sharing, fuzzy character, data complication and the scale effect, et al. And then the technical requirement for spatial information was discussed. Finally, the present work discussed the rules of constructing the spatial hydrogeological database that aimed to provide sharing service for multi-subject.Strictly distinguished from the paper information that only emphasized on the visual expression, the rules of spatial database in this work paid more emphasis on realizing the search and query function of same king hydrogeological information and the function of professional analysis and evaluation. This paper provided many rules for constructing regional hydrogeological database including precision control, data integrality, logical consistency and data quality control. Further more, some sub-rules were set up for constructing regional hydrogeological database such as the precision of data collection and vector scan, the precision of vector-map rectification, the spatial data projection, the vector collection method, the spatial data attribute frame and content, the integrity of map elements, the classification and encoding of map layers, the consistency of map layer attributes, data storage, metadata searching, data dictionary, the consistency of graphics topology and data quality control. All these rules would not only provide feasible thinking for setting up the criterion and guide of constructing spatial database for regional hydrogeological maps, but also provide technical support for redevelopment and utilization of hydrogeological data information.