gravity

<div>This layer is used in <a target='_blank' href='https://www.ncei.noaa.gov/maps/trackline-geophysics/' rel='nofollow ugc noopener noreferrer'>NCEI's Trackline Geophysical Data Viewer</a>.</div><div>&nbsp;</div><div><span style='font-family:&quot;Avenir Next W01&quot;, &quot;Avenir Next W00&quot;, &quot;Avenir Next&quot;, Avenir, &quot;Helvetica Neue&quot;, sans-serif; font-size:16px;'>The NOAA National Centers for Environmental Information (NCEI) Marine Trackline Geophysics database contains bathymetry, magnetics, gravity and seismic navigation data collected during marine cruises from 1939 to the present. Coverage is worldwide. Data sources include both US and foreign oceanographic institutions and government agencies. This feature layer shows tracks for all marine geophysical surveys in the database, split into sub-layers by data type.&nbsp;For more information about Marine Trackline Geophysics at NCEI, please see:&nbsp;</span><a target='_blank' href='https://www.ncei.noaa.gov/products/marine-trackline-geophysical-data' rel='nofollow ugc noopener noreferrer'>https://www.ncei.noaa.gov/products/marine-trackline-geophysical-data</a><span style='font-family:&quot;Avenir Next W01&quot;, &quot;Avenir Next W00&quot;, &quot;Avenir Next&quot;, Avenir, &quot;Helvetica Neue&quot;, sans-serif; font-size:16px;'>.</span></div><div><br />&nbsp;</div><div><p>ISO Metadata:</p><ul><li><a target='_blank' href='https://www.ncei.noaa.gov/metadata/geoportal/rest/metadata/item/gov.noaa.ngdc%3AG00129/html' rel='nofollow ugc noopener noreferrer'>NCEI Marine Geophysical Trackline Database</a></li><li><a target='_blank' href='https://www.ncei.noaa.gov/metadata/geoportal/rest/metadata/item/gov.noaa.ngdc%3AG01150/html' rel='nofollow ugc noopener noreferrer'>Airborne Magnetic Trackline and Survey Data</a></li></ul></div>