14BIM05_SSS_50cm_WGS84_UTM16N_Tile2: The 0.50-meter sample resolution of the side-scan sonar data collected in 2014 near Breton National Wildlife Refuge, Louisiana. This is tile two of four for this dataset.

As part of the Barrier Island Monitoring Project, scientists from the U.S. Geological Survey (USGS) St. Petersburg Coastal and Marine Science Center conducted nearshore geophysical surveys off Breton and Gosier Islands, Louisiana, in July and August of 2014. To assist the United States Fish and Wildlife Service (USFWS) with restoration planning efforts, the USGS was tasked with answering fundamental questions about the physical environment of the southern Chandeleur Islands, including the geology, morphology, and oceanography. Baseline data needed to answer these questions was either insufficient or missing in the area. The USGS conducted a comprehensive geologic investigation in the summer of 2014 by collecting geophysical and sedimentological data.
Breton Island, located at the southern end of the Chandeleur Island chain, Louisiana, was recognized as a natural and globally important nesting sanctuary for several bird species and was established as the Breton National Wildlife Refuge (NWR) in 1904. The aerial extent of Breton Island has diminished 90% since 1920. Land loss is attributed to ongoing relative sea-level rise, diminished sediment supply, and storm impacts. The bird population on Breton Island has also declined over the years, most notably after Hurricane George in 1998 and Hurricane Katrina in 2015, which completely submerged the island. Despite the decreasing habitable acreage, migratory seabirds continue to return and utilize Breton Island. To prevent the island from being completely submerged in the future and to protect, stabilize, and provide more nesting and foraging areas for the birding population, the USFWS is proposing a restoration effort to rebuild Breton Island to its pre-Katrina footprint.
This Data Series serves as an archive of processed interferometric-swath, single-beam bathymetry, and side-scan sonar data collected in the nearshore of Breton and Gosier Islands, NWR, Louisiana. The data were collected during two USGS cruises (USGS Field Activity Numbers 2014-314-FA and 2014-317-FA) in July and August 2014. Geographic Information System data products include a 100 meter-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 (FGDC) metadata.

作为屏障岛监测项目（Barrier Island Monitoring Project）的一部分，美国地质调查局（U.S. Geological Survey，USGS）圣彼得斯堡海岸与海洋科学中心的科研人员于2014年7月至8月，在路易斯安那州布雷顿岛与戈西尔岛近岸海域开展了地球物理勘测工作。

为协助美国鱼类及野生动物管理局（United States Fish and Wildlife Service，USFWS）推进修复规划工作，USGS承接了针对昌德勒尔群岛（Chandeleur Islands）南部物理环境的基础研究任务，涵盖地质学（geology）、地貌学（morphology）与海洋学（oceanography）方向。该区域此前用于解答上述问题的基线数据（baseline data）要么不足，要么完全缺失，因此USGS于2014年夏季开展全面地质调查，采集了地球物理与沉积学相关数据。

坐落于路易斯安那州昌德勒尔群岛最南端的布雷顿岛，是多种鸟类的天然全球重要筑巢庇护地，并于1904年被设立为布雷顿国家野生动物保护区（Breton National Wildlife Refuge，NWR）。自1920年以来，布雷顿岛的陆地面积已缩减90%，土地流失主要归因于持续的相对海平面上升、沉积物补给减少以及风暴冲击。多年来岛上的鸟类种群数量亦持续下降，尤以1998年乔治飓风（Hurricane George）与2015年卡特里娜飓风（Hurricane Katrina）之后最为显著，卡特里娜飓风曾完全淹没该岛。尽管可栖息面积不断缩减，迁徙海鸟仍会返回并利用布雷顿岛。为防止该岛未来彻底被淹没，并为鸟类种群提供更多筑巢与觅食区域、保护并稳定其栖息环境，USFWS正提议开展修复工程，将布雷顿岛恢复至卡特里娜飓风前的范围。

本数据集系列为路易斯安那州布雷顿岛与戈西尔岛（NWR）近岸海域采集的经过处理的干涉条带测深（interferometric-swath）、单波束测深（single-beam bathymetry）与侧扫声呐（side-scan sonar）数据档案。数据采集于2014年7月至8月的两次USGS科考航次（USGS野外活动编号：2014-314-FA与2014-317-FA）。地理信息系统（Geographic Information System，GIS）数据产品包含100米栅格分辨率的插值测深网格表面、测线地图与点数据文件。附加文件包括误差分析地图、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，FGDC）元数据。