The National 1: 1000000 Geological Map Spatial Database

The People's Republic of China 1:1000000 digital geological map database is based on uniform standards and requirements for the preparation of a thematic digital geological map. The geological map is based on comprehensive research, and fully absorbs the new achievements and new data of geological survey in recent years, making use of new technology, new theory and new methodology. Based on the chronology of the stratigraphic units and the representations of the rock strata, the intrusive rocks are further represented by the method of "lithology plus dating", which further improves the research degree of basic geology. The geological map database is rich in information with about 1.2 GB, having: rock stratigraphy units 5347 illustrations; intrusion "lithology plus era" unit 1780 cases; inter-provincial important fault 93; 558 important faults in the provinces (autonomous regions and municipalities); 1545 (group) of isotopic age data; and 382 representative holes. All the geometric elements of surface elements and line elements, isotopic age and drillings have established corresponding attributes, with adjacent maps between the map processing, map instructions and metadata are prepared. The database uses a unified linear library, symbol library, color library, the mapping process all using the MapGIS6.5 platform computer-aided map, plotting high precision, good quality, meeting design requirements to produce 64 national maps with four Area of the work of the method, the final unified system made. The digital geological map is the most complete and the latest 1: 1000000 geological map in China, being the first result of China's first such digital geological map using GIS technology, which fully reflects the characteristics of China's geological structure and the current new level of geological research.