Archive of Datasonics SIS-1000 Chirp Subbottom Data Collected During USGS Cruise SEAX 96004 New York Bight, 1 May - 9 June, 1996 Series Information:

This DVD-ROM contains copies of the navigation and field chirp subbottom
data collected aboard the R/V Seaward Explorer, from 1 May - 9 June, 1996.
The coverage is in the New York Bight area. This DVD-ROM (Digital
Versatile Disc-Read Only Memory) has been produced in accordance with the
UDF (Universal Disc Format) DVD-ROM Standard (ISO 9660 equivalent) and is
therefore capable of being read on any computing platform that has
appropriate DVD-ROM driver software installed. Access to the data and
information contained on this DVD-ROM was developed using the HyperText
Markup Language (HTML) utilized by the World Wide Web (WWW) project.
Development of the DVD-ROM documentation and user interface in HTML allows
a user to access the information by using a variety of WWW information
browsers (i.e. NCSA Mosaic, Netscape) to facilitate browsing and locating
information and data. To access the information contained on this disk
with a WWW client browser, open the file 'index.htm' at the top level
directory of this DVD-ROM with your selected browser. The HTML documentation is written utilizing some HTML 4.0 enhancements. The disk
should be viewable by all WWW browsers but may not properly format on some
older WWW browsers. Also, some links to USGS collaborators and other
agencies are available on this DVD-ROM. These links are only accessible if
access to the Internet is available during browsing of the DVD-ROM. The
archived Chirp subbottom data are in standard Society of Exploration
Geologists (SEG) SEG-Y format (Barry and others, 1975) and may be
downloaded for processing with software such as Seismic Unix or SIOSEIS.
The subbottom data were recorded on the ISIS data acquisition system in
QMIPS format. Chirp subbottom channel extracted from raw QMIPS format
sonar files and converted to 16-bit Int. SEG-Y format using the program
QMIPSTOSEGY. Even though the data are in SEG-Y format, it is not the
conventional time series data (e.g. voltages or pressures), but rather
instantaneous amplitude or envelope detected and therefore all of the
amplitudes are positive (though not simply rectified). DOS and Microsoft
Windows compatible software for plotting SEG-Y files (PLOTSEIS) and
viewing SEG-Y headers (DUMPSEGY) is located in the PLOTSEIS directory.
Processed chirp profiles (GIF images) may be viewed on this DVD-ROM with
your WWW browser.

For more information on the seismic surveys see http://woodshole.er.usgs.gov/operations/ia/public_ds_info.php?fa=1996-004-FA

These data are also available via GeoMapApp (http://www.geomapapp.org/) and Virtual Ocean ( http://www.virtualocean.org/) earth science exploration and visualization applications.

本DVD-ROM收录了1996年5月1日至6月9日期间，“海洋探索者号”科考船（R/V Seaward Explorer）采集的导航与野外chirp浅地层数据副本，数据覆盖纽约湾海域。
本DVD-ROM（数字多功能光盘只读存储器，Digital Versatile Disc-Read Only Memory）遵循通用光盘格式（Universal Disc Format, UDF）DVD-ROM标准（等效于ISO 9660格式），因此所有安装了适配DVD-ROM驱动软件的计算平台均可读取该光盘。
本光盘的数据与信息内容基于万维网（World Wide Web, WWW）项目所使用的超文本标记语言（HyperText Markup Language, HTML）开发。采用HTML编写的光盘文档与用户界面，支持用户通过各类万维网浏览器（如NCSA Mosaic、Netscape）访问信息，便于浏览与检索相关资料及数据。
若需通过万维网客户端浏览器读取本光盘内容，请使用所选浏览器打开光盘根目录下的"index.htm"文件。
本HTML文档采用了部分HTML 4.0增强特性，理论上所有万维网浏览器均可正常显示该光盘内容，但部分老旧浏览器可能无法正确格式化页面。
此外，光盘中还提供了指向美国地质调查局（USGS）合作机构及其他单位的链接，此类链接仅在浏览光盘时接入互联网方可正常访问。
归档的chirp浅地层数据采用标准勘探地质学家协会（Society of Exploration Geologists, SEG）SEG-Y格式存储（Barry等，1975），可下载后使用Seismic Unix、SIOSEIS等软件进行处理。
原始浅地层数据采用ISIS数据采集系统以QMIPS格式记录。研究人员从原始QMIPS格式声呐文件中提取chirp浅地层信道数据，并通过QMIPSTOSEGY程序将其转换为16位整型SEG-Y格式。
尽管该数据采用SEG-Y格式存储，但并非传统的时间序列数据（如电压或压力信号），而是经包络检波得到的瞬时振幅数据，因此所有振幅值均为正值（非简单整流结果）。
PLOTSEIS目录下提供了兼容DOS与Microsoft Windows的SEG-Y文件绘图软件（PLOTSEIS）及SEG-Y头文件查看软件（DUMPSEGY）。
本光盘中还存储了经处理的chirp剖面GIF图像，可通过万维网浏览器查看。
如需了解更多本次地震勘探的相关信息，请访问：http://woodshole.er.usgs.gov/operations/ia/public_ds_info.php?fa=1996-004-FA
本数据集还可通过GeoMapApp（http://www.geomapapp.org/）与Virtual Ocean（http://www.virtualocean.org/）两款地球科学勘探与可视化应用获取。