Chan13_IFB_tracklines: Shapefile of the Interferometric Swath Bathymetry (IFB) tracklines from USGS FAN 13BIM02 surveyed in July 2013 and 13BIM07 surveyed in August 2013 around the Chandeleur Islands, Louisiana.

As part of the Barrier Island Evolution Research Project, scientists from the U.S. Geological Survey (USGS) St. Petersburg Coastal and Marine Science Center (SPCMSC) conducted nearshore geophysical surveys around the northern Chandeleur Islands, Louisiana, in July and August of 2013. The objective of the study is to better understand barrier-island geomorphic evolution, particularly storm-related depositional and erosional processes that shape the islands over annual to interannual timescales (1‒5 years). Collecting geophysical data will allow us to identify relationships between the geologic history of the island and its present day morphology and sediment distribution. This mapping effort was the third in a series of three planned surveys in this area. High resolution geophysical data collected in each of three consecutive years along this rapidly changing barrier island system will provide a unique time-series dataset that will significantly further the analyses and geomorphological interpretations of this and other coastal systems, improving our understanding of coastal response and evolution over short time scales (1‒5 years).
This data series includes the geophysical data that were collected during two cruises (USGS Field Activity Numbers (FAN) 13BIM02, 13BIM03, and 13BIM04, in July 2013; and FANs 13BIM07 and 13BIM08 in August 2013) aboard the R/V Sallenger, the R/V Jabba Jaw, and the R/V Shark along the northern portion of the Chandeleur Islands, Breton National Wildlife Refuge, Louisiana. Primary data were acquired with the following equipment: (1) a Systems Engineering and Assessment, Ltd., SWATHplus interferometric sonar (468 kilohertz [kHz]), (2) an EdgeTech 424 (424 kHz) chirp sub-bottom profiling system, and (3) two Teledyne Odom Hydrographic Systems, Incorporated, Echotrach CV100 single beam echosounders.

This data series report serves as an archive of processed interferometric swath and single-beam bathymetry data. Geographic information system data products include an interpolated digital elevation model, trackline maps, 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 purposes. Any use of trade names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

本数据集隶属于障壁岛演化研究项目（Barrier Island Evolution Research Project），由美国地质调查局（U.S. Geological Survey, USGS）圣彼得堡海岸与海洋科学中心（St. Petersburg Coastal and Marine Science Center, SPCMSC）的科研人员于2013年7月至8月间，在路易斯安那州尚德勒尔群岛北部近岸海域开展了近岸地球物理勘测工作。
本研究旨在深入解析障壁岛的地貌演化过程，尤其是在年际至跨年度（1–5年）时间尺度上塑造岛屿的风暴相关沉积与侵蚀作用。通过采集地球物理数据，可厘清岛屿地质历史与现今地貌形态、沉积物分布之间的关联。本次测绘工作是该区域计划开展的三次系列勘测中的第三次。针对这一快速变化的障壁岛系统，连续三年采集的高分辨率地球物理数据将构成独特的时间序列数据集，可为该区域及其他海岸系统的分析与地貌学解释提供重要支撑，进而提升我们对短时间尺度（1–5年）内海岸响应与演化过程的认知。

本数据集包含两次航次采集的地球物理数据：2013年7月对应美国地质调查局野外活动编号（Field Activity Numbers, FAN）13BIM02、13BIM03及13BIM04，2013年8月对应FAN 13BIM07及13BIM08。勘测作业由R/V Sallenger号、R/V Jabba Jaw号及R/V Shark号科考船在路易斯安那州布雷顿国家野生动物保护区（Breton National Wildlife Refuge）境内的尚德勒尔群岛北部海域完成。本次勘测采用以下设备采集原始数据：（1）系统工程与评估有限公司（Systems Engineering and Assessment, Ltd.）研发的SWATHplus干涉测深声呐（468千赫兹[kHz]）；（2）EdgeTech 424型（424 kHz）啁啾海底剖面系统；（3）两台Teledyne Odom Hydrographic Systems, Incorporated公司生产的Echotrach CV100型单波束测深仪。

本数据集报告为经过处理的干涉条带测深与单波束测深地形数据的存档文件。地理信息系统数据产品包含插值数字高程模型、测线地图与点数据文件。附加文件还包括误差分析图、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：本数据仅用于科学研究，不得用于航行导航。文中提及的商品名称仅用于描述用途，并不代表美国政府的背书或认可。