13CCT04_IFB_tracklines.shp

In August of 2013, the U.S. Geological Survey (USGS) conducted geophysical surveys offshore of Petit Bois Island, Mississippi. These efforts are a continued part of the U.S. Geological Survey Gulf of Mexico Science Coordination partnership with the U.S. Army Corps of Engineers (USACE) to assist the Mississippi Coastal Improvements Program (MsCIP) and the Northern Gulf of Mexico (NGOM) Ecosystem Change and Hazards Susceptibility Project, by mapping the shallow geologic stratigraphic framework of the Mississippi Barrier Island Complex.
These geophysical surveys will provide the data necessary for scientists to define, interpret, and provide baseline bathymetry and seafloor habitat for this area to aid scientists in predicting future geomorphological changes to the islands with respect to climate change, storm impacts, and sea level rise. Furthermore, these data combined with the geomorphological results will provide the properties and extent of local offshore sand sediment resources available for planning and execution of the Gulf Islands National Seashore barrier island restoration.
The geophysical data were collected during one cruise (USGS Field Activity Numbers 13CCT04) aboard the University of Southern Mississippi Research Vessel Tommy Munro offshore along the gulf side of Petit Bois Island, Gulf Islands National Seashore, Mississippi. Data were acquired with the following equipment: a Systems Engineering and Assessment, Ltd., SWATHplus interferometric sonar (468 kilohertz (kHz)), an EdgeTech 424 (4-24 kHz), an EdgeTech 525i chirp sub-bottom profiling system, and a Klein 3900 sidescan sonar system.
This report serves as an archive of the processed interferometric swath bathymetry and sidescan sonar data. Geographic information system data products include an interpolated digital elevation model, an acoustic backscatter mosaic, a trackline map, and point data files. Additional files include error analysis maps, Field Activity Collection System logs, and formal Federal Geographic Data Committee metadata.
NOTE: These data are scientific in nature and are not to be used for navigation. Any use of trade names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

2013年8月，美国地质调查局（U.S. Geological Survey, USGS）在密西西比州珀蒂布瓦岛（Petit Bois Island）近海开展地球物理勘测。此项工作是美国地质调查局与美国陆军工程兵团（U.S. Army Corps of Engineers, USACE）墨西哥湾科学协作伙伴计划的延续，旨在通过绘制密西西比障壁岛群（Mississippi Barrier Island Complex）的浅部地质地层框架，为密西西比海岸改善计划（Mississippi Coastal Improvements Program, MsCIP）以及墨西哥湾北部（Northern Gulf of Mexico, NGOM）生态系统变化与灾害易感性项目提供支撑。

本次地球物理勘测所获数据，可为科研人员界定、阐释该区域的基础水深地形与海底生境提供必要依据，助力其针对气候变化、风暴影响及海平面上升情景，预测岛屿未来的地貌变化。此外，结合地貌勘测结果，这批数据还可明确当地近海砂质沉积资源的属性与分布范围，为墨西哥湾群岛国家海岸（Gulf Islands National Seashore）障壁岛修复工程的规划与实施提供支持。

本次地球物理数据由美国南密西西比大学“托马斯·门罗”号（Tommy Munro）科考船于单次巡航期间采集（对应美国地质调查局野外活动编号13CCT04），作业区域位于密西西比州墨西哥湾群岛国家海岸侧的珀蒂布瓦岛近海。数据采集使用了以下设备：系统工程与评估有限公司（Systems Engineering and Assessment, Ltd.）的SWATHplus干涉式声呐（468千赫，kHz）、EdgeTech 424型（4-24千赫）声呐、EdgeTech 525i型啁啾浅地层剖面系统，以及Klein 3900型侧扫声呐系统。

本报告为经处理的干涉式条带水深地形数据与侧扫声呐数据的存档资料。地理信息系统数据产品包括插值数字高程模型、声学背散射镶嵌图、测线图以及点数据文件。附加文件包含误差分析图件、野外活动采集系统日志，以及正式的联邦地理数据委员会（Federal Geographic Data Committee, FGDC）元数据。

注意：本批数据仅为科研用途，不得用于导航。提及商品名称仅为描述之用，并不代表美国政府对此类产品的认可。