OCS BOEM Offshore Boundary Lines

These data contain a national scale Submerged Lands Act (SLA) boundary line, Limit of "8(g) Zone," line and Continental Shelf Boundary. The SLA boundary defines the seaward limit of a state's submerged lands and the landward boundary of federally managed OCS lands. The Outer Continental Shelf Lands Act "8(g) Zone" lies between the Submerged Lands Act (SLA) boundary line and a line projected 3 nautical miles seaward of the SLA boundary line. Within this zone, oil and gas revenues are shared with the coastal state(s). The Continental Shelf Boundary defines the seaward limit of federally managed OCS lands. The line depicts the limit of U.S. jurisdiction for offshore mineral development. These data were created in the applicable NAD83 UTM or NAD27 UTM/SPCS Projection and re-projected to GCS WGS84 (EPSG 4326) for management in BOEM's enterprise GIS. However, this service in this collection has been published in WGS 1984 Web Mercator Auxiliary Sphere (EPSG 3857). Because GIS projection and topology functions can change or generalize coordinates, these data are NOT an OFFICIAL record for the exact boundaries. These data are to be used for Cartographic purposes only and should not be used to calculate area.本数据集包含国家级尺度的《水下土地法》（Submerged Lands Act, SLA）界线、“8(g)区域”界线与大陆架界线。《水下土地法》（SLA）界线界定了各州水下土地的向海边界，以及联邦管辖的外大陆架（Outer Continental Shelf, OCS）土地的向陆边界。外大陆架土地法“8(g)区域”位于SLA界线与自该界线向海延伸3海里的界线之间，该区域内的油气收益需与沿海州共享。大陆架界线界定了联邦管辖的外大陆架（OCS）土地的向海边界，同时划定了美国近海矿产开发的司法管辖范围。本数据集最初采用适用的北美1983大地基准通用横轴墨卡托（NAD83 UTM）或北美1927大地基准通用横轴墨卡托/州平面坐标系统（NAD27 UTM/SPCS）投影，并被重投影至世界大地坐标系1984（EPSG 4326），以用于海洋能源管理局（Bureau of Ocean Energy Management, BOEM）的企业地理信息系统（GIS）管理。不过本数据集中的此项服务采用WGS 1984 Web墨卡托辅助球体投影（EPSG 3857）发布。鉴于地理信息系统（GIS）的投影与拓扑功能可能会改变或简化坐标信息，本数据集并非精确边界的官方记录，仅可用于制图用途，不得用于面积计算。