全国 1∶200 000 数字地质图（公开版）空间数据库
收藏资源简介：
As the only one of its kind, China National Digital Geological Map (Public Version at 1∶200 000 scale) Spatial Database (CNDGM-PVSD) is based on China' s former nationwide measured results of regional geological survey at 1∶200 000 scale, and is also one of the nationwide basic geosciences spatial databases jointly accomplished by multiple organizations of China. Spatially, it embraces 1 163 geological map-sheets (at scale 1: 200 000) in both formats of MapGIS and ArcGIS, covering 72% of China's whole territory with a total data volume of 90 GB. Its main sources is from 1∶200 000 regional geological survey reports, geological maps, and mineral resources maps with an original time span from mid-1950s to early 1990s. Approved by the State's related agencies, it meets all the related technical qualification requirements and standards issued by China Geological Survey in data integrity, logic consistency, location acc racy, attribution fineness, and collation precision, and is hence of excellent and reliable quality. The CNDGM-PVSD is an important component of China' s national spatial database categories, serving as a spatial digital platform for the information construction of the State's national economy, and providing informationbackbones to the national and provincial economic planning, geohazard monitoring, geological survey, mineral resources exploration as well as macro decision-making.
作为同类唯一的中国国家数字地质图（公开版1∶20万比例尺）空间数据库（China National Digital Geological Map (Public Version at 1∶200 000 scale) Spatial Database，简称CNDGM-PVSD），其依托我国既往完成的全国范围1∶20万比例尺区域地质调查实测成果，同时也是我国多单位联合共建的全国基础地学空间数据库之一。空间维度上，该数据库包含MapGIS与ArcGIS两种格式的1163幅1∶20万比例尺地质图幅，覆盖我国陆地总面积的72%，总数据量达90吉字节（GB）。其核心数据源为1∶20万比例尺区域地质调查报告、地质图及矿产资源图，原始数据的时间跨度为20世纪50年代中期至90年代初期。经国家相关主管部门审批，该数据库在数据完整性、逻辑一致性、位置精度、属性精细度与整饰精度等方面均符合中国地质调查局发布的相关技术规范与标准，因此具备优异且可靠的质量。CNDGM-PVSD是我国国家空间数据库体系的重要组成部分，可作为国家国民经济信息化建设的空间数字平台，为国家及省级经济规划、地质灾害监测、地质调查、矿产资源勘查以及宏观决策提供核心信息支撑。
