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）在密西西比州佩蒂布瓦岛（Petit Bois Island）近海开展地球物理勘探工作。本次作业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的浅地层格架，助力密西西比海岸改善计划（Mississippi Coastal Improvements Program, MsCIP）以及北墨西哥湾（Northern Gulf of Mexico, NGOM）生态系统变化与灾害敏感性项目。

本次地球物理勘探所获数据，可为科研人员界定、解读该区域的基础水深地形与海底生境提供必要支撑，助力其针对气候变化、风暴影响及海平面上升情境，预测该障壁岛未来的地貌变化。此外，结合本次地貌探测结果，这批数据还可明确当地近海沙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）的障壁岛修复工程的规划与实施提供依据。

本次地球物理数据采集工作依托南密西西比大学研究船“汤米·门罗（Tommy Munro）”号开展，仅单次航次（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内佩蒂布瓦岛侧的近海海域。本次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干涉测深声呐（468千赫，kHz）、EdgeTech 424型（4-24千赫）设备、EdgeTech 525i型啁啾子海底剖面系统，以及Klein 3900型侧扫声呐系统。

本报告为经处理的干涉条带测深与侧扫声呐数据的存档文件。地理信息系统数据产品包含插值数字高程模型、声学背散射镶嵌图、测线分布图以及点数据文件。附加文件包括误差分析图件、野外活动采集系统日志，以及符合联邦地理数据委员会（Federal Geographic Data Committee, FGDC）规范的正式元数据。

注意：本批数据仅用于科学研究，不得用于导航。提及的商品名称仅用于描述用途，并不代表美国政府对此类商品的认可或背书。