基于SVG的时态GIS数据增量备份策略研究  

Incremental Data Backup Strategy Research on SVG-Based Temporal GIS

作　　者：王南图 

机构地区：[1]同济大学软件学院,上海201804

出　　处：《测绘与空间地理信息》2014年第1期33-37,共5页Geomatics & Spatial Information Technology

基　　金：国家自然科学基金项目(41171303)资助

摘　　要：首先分析了现有的GIS数据存储的特点、备份策略及其不足。在分析的基础上并结合SVG格式的特点本文提出了一种适合SVG格式时态GIS数据的改进增量备份模型。模型将完全备份和增量备份相结合,不单独保存增量备份产生的差异脚本。由于一个增量脚本文件中包含多个版本的差异脚本,完全备份和对应的增量脚本文件可以还原多个版本,且脚本可以复用,不存在冗余且效率明显提高。模型包含两个子算法,即差异脚本生成算法和恢复算法,实验验证算法是有效的。This paper firstly analyzes the features of data storage in temporal GIS, backup strategies and their drawbacks. Based on the analysis and according to the features of SVG file, this paper proposes an improved incremental backup model which suits SVG - based temporal GIS. This model combines full - backup and incremental backup. The differences script produced by incremental backup will no longer be saved as a file. Because several versions of differences scripts are included in the incremental script file, full - backup file and corresponding incremental script file can be used to recover several versions. Besides, the scripts can be reused and there is no redundancy, and the efficiency has been improved significantly. There are two subalgorithms in this model： differences scripts generation algorithm and another is recovery algorithm, which has been proved to be effective by experiments.

关 键 词：SVG 时态GIS 数据备份 增量备份模型 

分 类 号：P208[天文地球—地图制图学与地理信息工程]