| 基于统计模型的气象数据无损压缩新方法 |
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| 引用本文： | 罗坚,黄峰,张韧,王继光.基于统计模型的气象数据无损压缩新方法[J].地球科学进展,2003,18(4):637-642. |
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| 作者姓名： | 罗坚 黄峰 张韧 王继光 |
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| 作者单位： | 1. 中国人民解放军理工大学气象学院,江苏,南京,211101
2. 国防科技大学电子科学与工程学院,湖南,长沙,410073 |
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| 摘 要： | 对当前广泛使用的气象格点数据结构进行了统计分析，通过分析常用气象要素格点资料相邻格点之间的相关性及计算要素场的符号熵和信息冗余度，认为气象格点数据中存在着明显的信息冗余，具有很高的可压缩性，且相关性越好，可压缩性越高。在此分析基础上建立了气象格点数据的二维线性预测统计模型，剔除冗余信息，并结合Huffman编码，提出了一种气象格点数据无损压缩新方法。该方法可极大提高气象格点数据的压缩率，且能保证在有效精度内数据完全无损。最后对常用气象格点资料进行了压缩对比试验，结果表明，该方案压缩效果明显优于当前国际通用的气象数据压缩编码格式(如GRIB和netCDF码)，从而能够大大提高气象以及地球科学中海量数据采集、存储和传输交换的业务应用效率。
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| 关 键 词： | 气象数据 格点资料 无损压缩 预测编码 Huffman编码 |
| 文章编号： | 1001-8166(2003)04-0637-06 |
A NEW SCATHELESS COMPRESSION ENCODING SCHEME FOR METEOROLOGICAL GRID DATA BASED ON STATISTICAL MODEL |
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| Luo Jian,Huang Feng,Zhang Ren,Wang Jiguang.A NEW SCATHELESS COMPRESSION ENCODING SCHEME FOR METEOROLOGICAL GRID DATA BASED ON STATISTICAL MODEL[J].Advance in Earth Sciences,2003,18(4):637-642. |
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| Authors: | Luo Jian Huang Feng Zhang Ren Wang Jiguang |
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| Institution: | 1.Institute of Meteorology, PLA University of Sciences and Technology, Nanjing 211101,China;2.Institute of Electronic Sciences and Engineering, National University of Defense Technology, Changsha 410073, China |
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| Abstract: | In this paper, the general statistical structure and characteristics of meteorology grid data were analyzed. By analyzing the correlation between neighbor grid data, calculating its relevant symbol entropy and information redundancy, it was found that there is more information redundancy in meteorology grid data, so the grid data set can be better potentially compressed. The higher the correlation is, the more the condensability is. Based on above analyses, a 2-dimensions liner predictive statistical model for meteorology grid data was established to reduce information redundancy, and by combining of Huffman encoding which is efficient information source encoding scheme, a new scatheless compression scheme was designed to deal with meteorological grid data. By using the new scheme, the compression ratio for general meteorology grid data can be effectively promoted, and the compressing and uncompressing process of data is complete scatheless within available precision. Finally, a set of contrast experiment based on the usual meteorology grid data were presented and carried out. It is proved that the compression efficiency of the new scheme is evidently superior to that of GRIB and netCDF. The new compression encoding scheme may be widely used to treat with the vast data in meteorology and other earth sciences to improve the efficiency of data collecting, storing, translating and exchanging. |
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| Keywords: | Meteordogical grid data Scatheless compression Predictive encoding Huffman encoding |
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