1-Meter Sample Resolution Interferometric Swath Backscatter Data Collected in 2012 from the Chandeleur Islands, Louisiana (U.S. Geological Survey Field Activity Number 12BIM03)

As part of the Barrier Island Evolution Research Project, scientists from the U.S. Geological Survey's St. Petersburg Coastal and Marine Science Center conducted nearshore geophysical surveys off the northern Chandeleur Islands, Louisiana, in June of 2012. The overall 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). The collection of 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 first in a series of three planned surveys in this area. High resolution geophysical data collected in each of 3 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 report serves as an archive of processed interferometric swath and single-beam bathymetry data that were collected during two cruises (USGS Field Activity Numbers 12BIM03 and 12BIM04) along the northern portion of the Chandeleur Islands, Breton National Wildlife Refuge, Louisiana in July of 2012. Geographic information system data products include a 50 m-cell-size interpolated bathymetry grid surface, trackline maps, and point data files. Additional files include error analysis maps, Field Activity Collection System logs, and formal Federal Geographic Data Committee metadata.

作为障壁岛演化研究项目（Barrier Island Evolution Research Project）的一部分，2012年6月，美国地质调查局（U.S. Geological Survey）圣彼得斯堡海岸与海洋科学中心（St. Petersburg Coastal and Marine Science Center）的科研人员在路易斯安那州（Louisiana）尚德勒尔岛（Chandeleur Islands）北部近岸海域开展了近岸地球物理勘测。本研究的总体目标是深入解析障壁岛的地貌演化过程，特别是在年际至跨年度（1至5年）时间尺度上塑造岛屿的风暴相关沉积与侵蚀作用。地球物理数据的采集将助力科研人员厘清岛屿地质历史与现今地貌及沉积物分布之间的关联。此次测绘工作是该区域三项规划勘测中的首项。连续三年沿该快速变化的障壁岛系统采集的高分辨率地球物理数据将构建独特的时间序列数据集，可显著推进该区域及其他海岸系统的分析与地貌学解译工作，深化我们对短时间尺度（1至5年）内海岸响应与演化过程的认知。本报告存档了2012年7月，在路易斯安那州布雷顿国家野生动物保护区（Breton National Wildlife Refuge）尚德勒尔岛北部海域开展的两次科考航次（美国地质调查局野外活动编号：12BIM03与12BIM04）中采集的经过处理的干涉条带测深与单波束测深数据。地理信息系统数据产品包含50米网格分辨率的插值测深栅格表面、测线地图与点数据文件。附加文件涵盖误差分析地图、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）元数据。