海洋格点数据的无损压缩新方法  

A new scatheless compression scheme for oceanological grid data

作　　者：罗坚[1] 蒋国荣[1] 姜勇强[1] 吕梅[1] 

机构地区：[1]解放军理工大学气象学院,江苏南京211101

出　　处：《海洋预报》2011年第3期55-61,共7页Marine Forecasts

基　　金：国家自然科学基金项目(40905021);国家重点基础研究发展规划项目(973:2004CB418301)

摘　　要：格点数据是海洋科学资料存储交换的重要形式,资料量的爆炸性增长给数据的存储、传输带来了巨大压力。海洋格点资料与大气格点资料的最大区别在于陆地格点上不存在海洋要素值。本文分析了海洋格点数据的基本特点,综合了行程编码(RLE)和增量编码的特性,设计了海洋格点数据的无损压缩方案。试验表明,该方案具有较高的压缩比,而且在有效精度内是完全无损的,能大幅减少资料的存储空间和传输时间,在海洋和大气科学领域具有很好的应用前景。Grid data is one of the important forms for the storage and exchange of the oceanological data.The explosive increasing of the data have brought huge pressure for storage and exchange.The biggest difference be-tween the oceanological grid data and the atmospheric grid data is there having no oceanological elements at land grid.The fundamental features of the oceanological grid data are analyzed.Basing on the run length encoding（RLE） and increment encoding methods,a new scatheless compression scheme is presented for oceanological grid data.The experimental results show that the new scheme can provide high compression efficiency,and can greatly save storage space and the transmission time.Further more,the compressed data are completely scathe-less within available precision.So the new method has good application prospects in the field of ocean and atmo-sphere sciences.

关 键 词：海洋格点数据 行程编码 增量编码 无损压缩 

分 类 号：P413[天文地球—大气科学及气象学]