Single-Beam Bathymetry Sounding Data of Charlotte Harbor and offshore Captiva Island, Florida (2003-2004) in XYZ format

Charlotte Harbor is America's 17th largest and Florida's second largest open water estuary. It has a broad barrier island chain, large parts of which are in public ownership; its mangrove shoreline is largely intact and in public management. Regardless, the Charlotte Harbor Watershed is under significant development pressure with potential impact on storm water run-off characteristics, salinity patterns and temporal variations within the harbor, and nutrient and turbidity levels. The Harbor itself is particularly vulnerable to future degradation and therefore needs significant and sustained investment in water resource restoration. The USGS, in cooperation with South Florida Water Management District (SFWMD), performed a bathymetric survey of the lower portion of Charlotte Harbor, Pine Island Sound, and offshore of Little Gaspiralla Island to Captiva Island using a single beam hydrographic system. High resolution, acoustic bathymetric surveying is a proven method to map ocean and bay floor elevations. This report serves as an archive of processed single-beam bathymetry data that were collected in Charlotte Harbor and offshore Sanibel Island, Florida in 2003-2004. Geographic information system data products include a XYZ data, bathymetric contours, and USGS quadrangle map. Additional files include formal Federal Geographic Data Committee (FGDC) metadata.夏洛特港（Charlotte Harbor）是美国第17大、佛罗里达州第二大开放式水域河口。它拥有宽阔的障壁岛链，其中大部分区域为公共所有；其红树林岸线基本保持完整且由公共部门管理。尽管如此，夏洛特港流域仍面临显著的开发压力，这可能对港内的雨水径流特征、盐度格局与时间变化，以及营养盐和浊度水平产生潜在影响。该港本身尤其易遭受未来的生态退化，亟需对水资源修复工作投入大量且持续的资金。 美国地质调查局（USGS）与南佛罗里达水资源管理区（South Florida Water Management District, SFWMD）合作，采用单波束水文测量系统，对夏洛特港下段、派恩岛湾（Pine Island Sound）以及小加斯佩里拉岛（Little Gaspiralla Island）至卡普蒂瓦岛（Captiva Island）的近海区域开展了水深测量。高分辨率声学水深测量是一种成熟的海底与海湾底床高程测绘方法。 本报告作为2003-2004年间在佛罗里达州夏洛特港及萨尼贝尔岛（Sanibel Island）近海采集的经处理单波束水深测量数据的存档文件。其地理信息系统数据产品包括XYZ数据、水深等值线图以及美国地质调查局标准分幅地形图（USGS quadrangle map）。附加文件包含正式的联邦地理数据委员会（Federal Geographic Data Committee, FGDC）元数据。