Marine Trackline Geophysics Database
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Marine Trackline Geophysics Database This feature layer, utilizing National Geospatial Data Asset (NGDA) data from the National Oceanic and Atmospheric Administration (NOAA), displays global bathymetry, magnetic, gravity and seismic shot point navigation data. Per NOAA, “This data set contains bathymetry, magnetic, gravity and seismic shot point navigation data collected during marine cruises from 1939 to the present. Coverage is worldwide. The Data records present geophysical data (bathymetry, magnetics and gravity) and seismic information (shot-point identification) with a corresponding time and position. Documentation that varies within the cruise is also included with the data records.” PM-HI-ALT-WORLD-RSD-4 (Aeromagnetics) and P885NS (Gravity Survey) Data currency: This cached Esri federal service is checked weekly for updates from its enterprise federal source (TracklineCombined Dynamic) and will support mapping, analysis, data exports and OGC API – Feature access. NGDAID: 44 (Marine Trackline Geophysical Database) OGC API Features Link: (Marine Trackline Geophysical Database - OGC Features) copy this link to embed it in OGC Compliant viewers For more information: Marine Trackline Geophysical Data For feedback please contact: Esri_US_Federal_Data@esri.com NGDA Data Set This data set is part of the NGDA Elevation Theme Community. Per the Federal Geospatial Data Committee (FGDC), Elevation is defined as "the measured vertical position of the earth surface and other landscape or bathymetric features relative to a reference datum typically related to sea level. These points normally describe bare earth positions but may also describe the top surface of buildings and other objects, vegetation structure, or submerged objects. Elevation data can be stored as a three-dimensional array or as a continuous surface such as a raster, triangulated irregular network, or contours. Elevation data may also be represented in other derivative forms such as slope, aspect, ridge and drainage lines, and shaded relief." For other NGDA Content: Esri Federal Datasets
海洋测线地球物理数据库 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）提供的国家地理空间数据资产（National Geospatial Data Asset, NGDA）数据，展示全球水深、磁测、重力以及地震炮点导航数据。 据NOAA说明："本数据集包含1939年至今海洋科考航次采集的水深、磁测、重力及地震炮点导航数据，覆盖范围遍及全球。数据记录包含对应时间与位置的地球物理数据（水深、磁测与重力数据）以及地震信息（炮点标识），数据记录中还附带随航次有所差异的相关文档。" PM-HI-ALT-WORLD-RSD-4（航空磁测）与P885NS（重力测量） 数据更新频率：本缓存的Esri联邦服务每周会从其企业级联邦数据源（TracklineCombined Dynamic）检查更新，可支持制图、分析、数据导出以及OGC要素接口访问。 NGDA标识符：44（海洋测线地球物理数据库） OGC要素服务接口链接：（海洋测线地球物理数据库-OGC要素服务）请复制该链接以嵌入支持OGC标准的可视化工具中。 更多信息：海洋测线地球物理数据 如需反馈，请联系：Esri_US_Federal_Data@esri.com 国家地理空间数据资产数据集 本数据集隶属于NGDA高程主题社区（NGDA Elevation Theme Community）。 据联邦地理空间数据委员会（Federal Geospatial Data Committee, FGDC）定义，高程是"相对于通常以海平面为基准的参考基准面，测得的地球表面及其他地貌或水下地形特征的垂直位置。此类数据点通常对应裸土表面位置，但也可代表建筑物及其他物体的顶面、植被结构或淹没物体的表面。高程数据可存储为三维数组，或连续曲面形式（如栅格、不规则三角网或等高线）。高程数据也可衍生为其他形式，如坡度、坡向、山脊线、汇水线以及阴影晕渲图。" 如需获取其他NGDA内容，请访问：Esri联邦数据集（Esri Federal Datasets）
