详细信息   

• 责任者：Zhang Zhengbing (School of Electronic Information ; Yangtze University ; Jingzhou 434023 ; China) ; Gui Zhixian
• 刊名：Chinese Journal of Geophysics
• 出版年：2010
• 卷期：53(11)
• 关键词：地震勘探 ; seismic exploration
• 页码：p.2747-2753
• 图表：5 illus., 2 tables, 20 refs.
• 分类号：1600
• issnNo：ISSN0001-5733
• isbnNo：CN11-2074/P

摘要

In this paper, the header ratio is defined as the ratio between the SEG Y header data volume and the SEG Y file size, a formula describing the relationship between the header ratio, the compression ratio of SEG Y header data and the compression ratio of the SEG Y file is derived. It is discovered from the formula that the theoretical limit of the SEG Y file compression ratio is the quotient of the SEG Y header data compression ratio divided by the header ratio, therefore, it is necessary to compress the header data efficiently in order to get a high compression of the SEG Y file. Furthermore, the statistical properties of the SEG Y reel header data and trace header data are analyzed. An efficient lossless compression method for SEG Y header data, known as Header Identification Data Lossless Prediction Coding (HIDLPC) method, is proposed. Experimental results show that the lossless compression ratio by using HIDLPC to compress SEG Y header data is between 30 and 1 000, much higher than the corresponding compression ratios by using Winzip and WinRAR.