Abstract:
Aiming at the high cost of transmitting and preserving for redundancy GML-based spatial data, a compression method is presented. It uses VTD-XML to parse GML document and designs GBW transform which transforms tree structure of GML-based spatial data to two linear structure data. It uses GZip to compress the data and output it. Experimental result indicates it defeats common methods and can improve compression rate of GML-based spatial data efficiency while not needing more compression and de-compression time.
Key words:
GML-based spatial data,
mpression,
GBW transform,
VTD-XML parser
摘要: 针对GML空间数据冗余较大且存储和传输代价高的问题,提出一种GML空间数据压缩方法,采用VTD-XML解析GML文档,设计将树形结构的GML空间数据转换为2个线性结构数据的GBW变换,利用GZip压缩数据并输出。实验结果表明,该方法优于传统压缩方法,在提高GML空间数据压缩率的同时,并未明显增加压缩及解压缩时间。
关键词:
GML空间数据,
缩,
BW变换,
TD-XML解析
CLC Number:
SHU Hua, LI Yan. Research on Compression Technology of GML-based Spatial Data[J]. Computer Engineering, 2010, 36(14): 26-28.
朱华, 李岩. GML空间数据压缩技术研究[J]. 计算机工程, 2010, 36(14): 26-28.