Oceanographic Observation Benchmarks

Oceanographic Observation Benchmarks This feature layer, utilizing National Geospatial Data Asset (NGDA) data from the National Oceanic and Atmospheric Administration (NOAA), displays the Center for Operational Oceanographic Products and Services (CO-OPS) locations of present and historical stations in the United States at which benchmarks have been derived from oceanographic observations. According to NOAA, a bench mark is "a fixed physical object or mark used as reference for a horizontal or vertical datum. A tidal bench mark is one near a tide station to which the tide staff and tidal datums are referred. A primary bench mark is the principal mark of a group of tidal bench marks to which the tide staff and tidal datums are referred." Chatham, Lydia Cove (MA) & Chatham, Stage Harbor (MA) Data currency: This cached Esri federal service is checked weekly for updates from its enterprise federal source (Benchmarks) and will support mapping, analysis, data exports and OGC API – Feature access. NGDAID: 178 (Sea Level Trends: Sea Level Variations of the United States Derived from National Water Level Observation Network Stations) OGC API Features Link: (CO-OPS Benchmarks - OGC Features) copy this link to embed it in OGC For more information: Bench Mark Data Sheets - Station Selection; Tides & Currents Products For feedback please contact: [e-mail] NGDA Data Set This data set is part of the NGDA Water - Oceans & Coast Theme Community. Per the Federal Geospatial Data Committee (FGDC), Water - Oceans & Coast is defined as “features and characteristics of salt water bodies (i.e. tides, tidal waves, coastal information, reefs) and features and characteristics that represent the intersection of the land with the water surface (i.e. shorelines), the lines from which the territorial sea and other maritime zones are measured (i.e. baseline maritime) and lands covered by water at any stage of the tide (i.e. Outer Continental Shelf ), as distinguished from tidelands, which are attached to the mainland or an island and cover and uncover with the tide.” For other NGDA Content: Esri Federal Datasets海洋观测基准数据集（Oceanographic Observation Benchmarks） 本要素图层采用美国国家海洋和大气管理局（National Oceanic and Atmospheric Administration, NOAA）的国家地理空间数据资产（National Geospatial Data Asset, NGDA）数据，展示美国国家海洋和大气管理局业务海洋产品与服务中心（Center for Operational Oceanographic Products and Services, CO-OPS）所辖的、通过海洋观测数据推导得到基准值的美国境内现有及历史验潮站点位。 根据NOAA官方定义，基准点（bench mark）是"用作水平或垂直基准参考的固定实体物体或标记"；潮汐基准点是邻近验潮站的基准点，用于校准验潮杆与潮汐基准面；主基准点则是一组潮汐基准点中的核心标记，同样用于校准验潮杆与潮汐基准面。 示例站点：马萨诸塞州查塔姆市莉迪亚湾（Chatham, Lydia Cove (MA)）与马萨诸塞州查塔姆市舞台港（Chatham, Stage Harbor (MA)）。 数据时效性说明：本缓存的Esri联邦服务每周会从其企业联邦源（基准点数据集）检查更新，可支持制图、分析、数据导出以及OGC API – 要素服务访问。 NGDAID：178（海平面趋势：基于全国水位观测站网络推导的美国海平面变化） OGC API要素链接：（CO-OPS 基准点 - OGC 要素服务），请复制该链接以嵌入OGC服务。 更多参考资料：基准点数据表 - 站点选择；潮汐与海流产品 反馈联系方式：[e-mail] 本数据集隶属于NGDA 水文-海洋与海岸主题社区（NGDA Water - Oceans & Coast Theme Community）。根据联邦地理空间数据委员会（Federal Geospatial Data Committee, FGDC）的定义，水文-海洋与海岸主题指"咸水水体的要素与特征（如潮汐、潮波、海岸信息、珊瑚礁），以及表征陆地与水面交界的要素与特征（如海岸线，即用于测算领海及其他海洋区域的基线；以及任何潮汐阶段被海水覆盖的陆地（如外大陆架），区别于依附于大陆或岛屿、随潮汐涨落而显露隐没的潮间带）"。 其他NGDA相关内容可访问：Esri联邦数据集（Esri Federal Datasets）