CAJ | 학술논문

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。
수선분석료현유적GIS수거존저적특점、비빈책략급기불족。재분석적기출상병결합SVG 격식적특점본문제출료일충괄합SVG격식시태GIS 수거적개진증량비빈모형。모형장완전비빈화증량비빈상결합，불단독보존증량비빈산생적차이각본。유우일개증량각본문건중포함다개판본적차이각본，완전비빈화대응적증량각본문건가이환원다개판본，차각본가이복용，불존재용여차효솔명현제고。모형포함량개자산법，즉차이각본생성산법화회복산법，실험험증산법시유효적。
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 .