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                                    <gco:CharacterString>NCEI Accession 0234167</gco:CharacterString>
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                                    <gco:CharacterString>published 2023-08-07T14:18:58Z</gco:CharacterString>
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Units: m;
Observation Category: in situ;
Sampling Instrument: EM1002</gco:CharacterString>
              </gmd:description>
            </gmi:LE_ProcessStep>
          </gmd:processStep>
          <gmd:processStep>
            <gmi:LE_ProcessStep>
              <gmd:description>
                <gco:CharacterString>Parameter or Variable: sediment echosounding (measured);
Units: various;
Observation Category: in situ;
Sampling Instrument: IKB-SEISTEC</gco:CharacterString>
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        <gmd:MD_MaintenanceFrequencyCode codeList="https://data.noaa.gov/resources/iso19139/schema/resources/Codelist/gmxCodelists.xml#MD_MaintenanceFrequencyCode" codeListValue="asNeeded">asNeeded</gmd:MD_MaintenanceFrequencyCode>
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        <gco:CharacterString>Metadata are developed, maintained and distributed by NCEI. Updates are performed as needed to maintain currentness.</gco:CharacterString>
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                <gco:CharacterString>multibeam sonar</gco:CharacterString>
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            <gco:CharacterString>multibeam sonar</gco:CharacterString>
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          <gmi:description>
            <gco:CharacterString>generic instrument to measure seafloor topography

Active sensors that utilize acoustic energy to collect measurements of seafloor depth and character (from http://www.csc.noaa.gov/crs/rs_apps/sensors/multi_beam.htm (last accessed 2008-12-09).

Seafloor topography, bathymetry and other related geophysical data are usually managed and archived at the NOAA National Geophysical Data Center (www.ngdc.noaa.gov/mgg/).</gco:CharacterString>
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            <gco:CharacterString>sediment sampler - corer</gco:CharacterString>
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            <gco:CharacterString>sediment coring device

gravity or other coring device used to collect surfacial and near-surficial sediment samples</gco:CharacterString>
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            <gco:CharacterString>ALIS</gco:CharacterString>
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          <gmi:instrument gco:nilReason="missing" />
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</gmi:MI_Metadata>