基于“要素对象空间信息指纹”的变化空间数据同步技术的研究

Research on Changed Spatial Data Synchronization Technology Based on the "Feature Object Spatial Information Fingerprint"

随着空间数据库的建设和应用的发展,空间数据动态更新和数据分发成为确保数据现势性的主要研究课题,系统提出将地形地物要素数据的坐标数组通过MD5算法生成32位字符串的"要素对象空间信息指纹"作为判定要素数据变化的方法,结合Oracle数据库CDC技术,快速获取空间变化数据,再通过ETL数据同步机制流程化管理空间同步过程,多节点、多级联按需配置同步图层,实现不同Oracle数据库版本、不同Arc SDE版本间的空间数据断点续传同步功能。

With the development of spatial database construction and application,spatial data dynamic update and data distribution are the main research topics for ensuring the current situation of data.The system proposed a method of the coordinate array of the feature change by MD5algorithm to generate32-bit string as"feature object space information fingerprint",then extracted the changed data with the CDC Oracle database technology,and through the ETL data synchronization mechanism managed the space synchronization process,to achieve the resumption of synchronization function on multi-node,multi-cascade configuration synchronization layer on demand,different Oracle database version,and different ArcSDE versions of the space data.