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  </gmd:hierarchyLevel>
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        <gmd:CI_Contact>
          <gmd:address>
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            </gmd:CI_Address>
          </gmd:address>
          <gmd:onlineResource>
            <gmd:CI_OnlineResource>
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                <gmd:URL>https://www.ncei.noaa.gov/contact</gmd:URL>
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              <gmd:name>
                <gco:CharacterString>NCEI Contact Information</gco:CharacterString>
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              <gmd:description>
                <gco:CharacterString>Information for contacts at NCEI.</gco:CharacterString>
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                <gmd:CI_OnLineFunctionCode codeList="https://data.noaa.gov/resources/iso19139/schema/resources/Codelist/gmxCodelists.xml#CI_OnLineFunctionCode" codeListValue="information">information</gmd:CI_OnLineFunctionCode>
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        </gmd:CI_Contact>
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        <gmd:CI_RoleCode codeList="https://data.noaa.gov/resources/iso19139/schema/resources/Codelist/gmxCodelists.xml#CI_RoleCode" codeListValue="pointOfContact">pointOfContact</gmd:CI_RoleCode>
      </gmd:role>
    </gmd:CI_ResponsibleParty>
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  <gmd:dateStamp>
    <gco:DateTime>2025-04-16T17:10:38</gco:DateTime>
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    <gco:CharacterString>ISO 19115-2:2009(E)</gco:CharacterString>
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      <gmd:geometricObjects>
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    <gmd:MD_ReferenceSystem>
      <gmd:referenceSystemIdentifier>
        <gmd:RS_Identifier>
          <gmd:authority gco:nilReason="inapplicable" />
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            <gco:CharacterString>Through the collection reference systems have vaired with time and location. Please see survey level metadata for detailed information.</gco:CharacterString>
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    <gmd:MD_DataIdentification>
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          <gmd:title>
            <gco:CharacterString>Multibeam Bathymetry Database (MBBDB)</gco:CharacterString>
          </gmd:title>
          <gmd:date>
            <gmd:CI_Date>
              <gmd:date>
                <gco:Date>1980</gco:Date>
              </gmd:date>
              <gmd:dateType>
                <gmd:CI_DateTypeCode codeList="https://data.noaa.gov/resources/iso19139/schema/resources/Codelist/gmxCodelists.xml#CI_DateTypeCode" codeListValue="creation">creation</gmd:CI_DateTypeCode>
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            </gmd:CI_Date>
          </gmd:date>
          <gmd:date>
            <gmd:CI_Date>
              <gmd:date>
                <gco:Date>2023</gco:Date>
              </gmd:date>
              <gmd:dateType>
                <gmd:CI_DateTypeCode codeList="https://data.noaa.gov/resources/iso19139/schema/resources/Codelist/gmxCodelists.xml#CI_DateTypeCode" codeListValue="revision">revision</gmd:CI_DateTypeCode>
              </gmd:dateType>
            </gmd:CI_Date>
          </gmd:date>
          <gmd:date>
            <gmd:CI_Date>
              <gmd:date>
                <gco:Date>2023-09-15</gco:Date>
              </gmd:date>
              <gmd:dateType>
                <gmd:CI_DateTypeCode codeList="https://data.noaa.gov/resources/iso19139/schema/resources/Codelist/gmxCodelists.xml#CI_DateTypeCode" codeListValue="publication">publication</gmd:CI_DateTypeCode>
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            </gmd:CI_Date>
          </gmd:date>
          <gmd:identifier>
            <gmd:MD_Identifier>
              <gmd:authority>
                <gmd:CI_Citation>
                  <gmd:title>
                    <gco:CharacterString>International DOI Foundation (IDF)</gco:CharacterString>
                  </gmd:title>
                  <gmd:date gco:nilReason="inapplicable" />
                </gmd:CI_Citation>
              </gmd:authority>
              <gmd:code>
                <gmx:Anchor xlink:href="https://doi.org//10.7289/V56T0JNC" xlink:title="DOI" xlink:actuate="onRequest">doi:10.7289/V56T0JNC</gmx:Anchor>
              </gmd:code>
            </gmd:MD_Identifier>
          </gmd:identifier>
          <gmd:identifier>
            <gmd:MD_Identifier>
              <gmd:authority>
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                    <gco:CharacterString>NOAA National Centers for Environmental Information</gco:CharacterString>
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                  <gmd:date gco:nilReason="inapplicable" />
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          </gmd:identifier>
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                <gco:CharacterString>NOAA National Centers for Environmental Information</gco:CharacterString>
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            </gmd:CI_ResponsibleParty>
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            <gmd:CI_ResponsibleParty>
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              <gmd:role>
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              </gmd:role>
            </gmd:CI_ResponsibleParty>
          </gmd:citedResponsibleParty>
          <gmd:otherCitationDetails>
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        <gco:CharacterString>Originally designed for military use, the multibeam echosounder has proved very useful for nautical charting, oceanographic research and modeling, habitat classification, maritime commerce, and recreational applications. The Multibeam Bathymetry Database at NCEI collects and archives multibeam data from the earliest commercial installations (circa 1980) through today's modern high-resolution collections. Data are acquired from a variety of primarily government and academic sources (see individual cruise metadata records for source information) and consist of the raw (as collected) sonar data files. Datasets may also include processed or edited versions of the sonar data, ancillary data, derived products, and/or metadata for the data collection. The Multibeam Bathymetry Database provides data that span the globe and are discoverable and accesible via map interface or text-only search options.</gco:CharacterString>
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      <gmd:status>
        <gmd:MD_ProgressCode codeList="https://data.noaa.gov/resources/iso19139/schema/resources/Codelist/gmxCodelists.xml#MD_ProgressCode" codeListValue="onGoing">onGoing</gmd:MD_ProgressCode>
      </gmd:status>
      <gmd:pointOfContact xlink:title="NCEI (pointOfContact)">
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            <gco:CharacterString>NOAA National Centers for Environmental Information</gco:CharacterString>
          </gmd:organisationName>
          <gmd:contactInfo>
            <gmd:CI_Contact>
              <gmd:address>
                <gmd:CI_Address>
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                </gmd:CI_Address>
              </gmd:address>
              <gmd:onlineResource>
                <gmd:CI_OnlineResource>
                  <gmd:linkage>
                    <gmd:URL>https://www.ncei.noaa.gov/contact</gmd:URL>
                  </gmd:linkage>
                  <gmd:name>
                    <gco:CharacterString>NCEI Contact Information</gco:CharacterString>
                  </gmd:name>
                  <gmd:description>
                    <gco:CharacterString>Information for contacts at NCEI.</gco:CharacterString>
                  </gmd:description>
                  <gmd:function>
                    <gmd:CI_OnLineFunctionCode codeList="https://data.noaa.gov/resources/iso19139/schema/resources/Codelist/gmxCodelists.xml#CI_OnLineFunctionCode" codeListValue="information">information</gmd:CI_OnLineFunctionCode>
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          <gmd:role>
            <gmd:CI_RoleCode codeList="https://data.noaa.gov/resources/iso19139/schema/resources/Codelist/gmxCodelists.xml#CI_RoleCode" codeListValue="pointOfContact">pointOfContact</gmd:CI_RoleCode>
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        </gmd:CI_ResponsibleParty>
      </gmd:pointOfContact>
      <gmd:pointOfContact xlink:title="Multibeam Bathymetry Data Manager">
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          <gmd:organisationName>
            <gco:CharacterString>NOAA National Centers for Environmental Information</gco:CharacterString>
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          </gmd:positionName>
          <gmd:contactInfo>
            <gmd:CI_Contact>
              <gmd:phone>
                <gmd:CI_Telephone>
                  <gmd:voice>
                    <gco:CharacterString>(303) 497-4613</gco:CharacterString>
                  </gmd:voice>
                  <gmd:facsimile>
                    <gco:CharacterString>(303) 497-6513</gco:CharacterString>
                  </gmd:facsimile>
                </gmd:CI_Telephone>
              </gmd:phone>
              <gmd:address>
                <gmd:CI_Address>
                  <gmd:electronicMailAddress>
                    <gco:CharacterString>mb.info@noaa.gov</gco:CharacterString>
                  </gmd:electronicMailAddress>
                </gmd:CI_Address>
              </gmd:address>
              <gmd:hoursOfService>
                <gco:CharacterString>8:00 - 4:30 Mountain</gco:CharacterString>
              </gmd:hoursOfService>
            </gmd:CI_Contact>
          </gmd:contactInfo>
          <gmd:role>
            <gmd:CI_RoleCode codeList="https://data.noaa.gov/resources/iso19139/schema/resources/Codelist/gmxCodelists.xml#CI_RoleCode" codeListValue="pointOfContact">pointOfContact</gmd:CI_RoleCode>
          </gmd:role>
        </gmd:CI_ResponsibleParty>
      </gmd:pointOfContact>
      <gmd:resourceMaintenance>
        <gmd:MD_MaintenanceInformation>
          <gmd:maintenanceAndUpdateFrequency>
            <gmd:MD_MaintenanceFrequencyCode codeList="https://data.noaa.gov/resources/iso19139/schema/resources/Codelist/gmxCodelists.xml#MD_MaintenanceFrequencyCode" codeListValue="asNeeded">asNeeded</gmd:MD_MaintenanceFrequencyCode>
          </gmd:maintenanceAndUpdateFrequency>
          <gmd:maintenanceNote>
            <gco:CharacterString>Updated as needed</gco:CharacterString>
          </gmd:maintenanceNote>
        </gmd:MD_MaintenanceInformation>
      </gmd:resourceMaintenance>
      <gmd:graphicOverview>
        <gmd:MD_BrowseGraphic>
          <gmd:fileName>
            <gco:CharacterString>https://ngdc.noaa.gov/mgg/image/multibeam.gif</gco:CharacterString>
          </gmd:fileName>
          <gmd:fileDescription>
            <gco:CharacterString>1996: Dr. Lincoln Pratson, INSTAAR/NGDC offshore California gridded multibeam data</gco:CharacterString>
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          <gmd:fileType>
            <gco:CharacterString>gif</gco:CharacterString>
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      </gmd:graphicOverview>
      <gmd:descriptiveKeywords xlink:title="NGDA Elevation Keywords">
        <gmd:MD_Keywords xsi:schemaLocation="http://www.isotc211.org/2005/gmd http://www.ngdc.noaa.gov/metadata/published/xsd/schema.xsd" uuid="0b7084e5-bf33-4cfc-a0ef-98c64b6f81f1">
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            <gco:CharacterString>NGDA</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>National Geospatial Data Asset</gco:CharacterString>
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          <gmd:keyword>
            <gco:CharacterString>Elevation Theme</gco:CharacterString>
          </gmd:keyword>
          <gmd:type>
            <gmd:MD_KeywordTypeCode codeList="http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#MD_KeywordTypeCode" codeListValue="theme">theme</gmd:MD_KeywordTypeCode>
          </gmd:type>
          <gmd:thesaurusName>
            <gmd:CI_Citation>
              <gmd:title>
                <gco:CharacterString>NGDA Portfolio Themes</gco:CharacterString>
              </gmd:title>
              <gmd:date gco:nilReason="unknown" />
            </gmd:CI_Citation>
          </gmd:thesaurusName>
        </gmd:MD_Keywords>
      </gmd:descriptiveKeywords>
      <gmd:descriptiveKeywords>
        <gmd:MD_Keywords>
          <gmd:keyword>
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          <gmd:keyword>
            <gco:CharacterString>Earth Science &gt; Oceans &gt; Bathymetry/Seafloor Topography &gt; Bathymetry</gco:CharacterString>
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          <gmd:keyword>
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          <gmd:keyword>
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          <gmd:keyword>
            <gco:CharacterString>Earth Science &gt; Oceans &gt; Bathymetry/Seafloor Topography &gt; Ocean Plateaus/Ridges</gco:CharacterString>
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          <gmd:keyword>
            <gco:CharacterString>Earth Science &gt; Oceans &gt; Bathymetry/Seafloor Topography &gt; Seafloor Topography</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>Earth Science &gt; Oceans &gt; Bathymetry/Seafloor Topography &gt; Seamounts</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>Earth Science &gt; Oceans &gt; Bathymetry/Seafloor Topography &gt; Submarine Canyons</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>Earth Science &gt; Oceans &gt; Bathymetry/Seafloor Topography &gt; Trenches</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>Earth Science &gt; Oceans &gt; Bathymetry/Seafloor Topography &gt; Water Depth</gco:CharacterString>
          </gmd:keyword>
          <gmd:type>
            <gmd:MD_KeywordTypeCode codeList="https://data.noaa.gov/resources/iso19139/schema/resources/Codelist/gmxCodelists.xml#MD_KeywordTypeCode" codeListValue="theme">theme</gmd:MD_KeywordTypeCode>
          </gmd:type>
          <gmd:thesaurusName xlink:title="GCMD Science Keywords">
            <gmd:CI_Citation uuid="227737d0-428b-11df-9879-0800200c9a66">
              <gmd:title>
                <gco:CharacterString>Global Change Master Directory (GCMD) Science Keywords</gco:CharacterString>
              </gmd:title>
              <gmd:date>
                <gmd:CI_Date>
                  <gmd:date>
                    <gco:Date>2024</gco:Date>
                  </gmd:date>
                  <gmd:dateType>
                    <gmd:CI_DateTypeCode codeList="https://data.noaa.gov/resources/iso19139/schema/resources/Codelist/gmxCodelists.xml#CI_DateTypeCode" codeListValue="revision">revision</gmd:CI_DateTypeCode>
                  </gmd:dateType>
                </gmd:CI_Date>
              </gmd:date>
              <gmd:edition>
                <gco:CharacterString>19</gco:CharacterString>
              </gmd:edition>
              <gmd:citedResponsibleParty xlink:title="GCMD Landing Page">
                <gmd:CI_ResponsibleParty uuid="1edb41d0-428a-11df-9879-0800200c9a66">
                  <gmd:organisationName>
                    <gco:CharacterString>Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA)</gco:CharacterString>
                  </gmd:organisationName>
                  <gmd:contactInfo>
                    <gmd:CI_Contact>
                      <gmd:onlineResource>
                        <gmd:CI_OnlineResource>
                          <gmd:linkage>
                            <gmd:URL>https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords</gmd:URL>
                          </gmd:linkage>
                          <gmd:name>
                            <gco:CharacterString>GCMD Keyword Forum Page</gco:CharacterString>
                          </gmd:name>
                          <gmd:description>
                            <gco:CharacterString>Global Change Master Directory (GCMD). 2024. GCMD Keywords, Version 19. Greenbelt, MD: Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA). URL (GCMD Keyword Forum Page): https://forum.earthdata.nasa.gov/app.php/tag/GCMD+Keywords</gco:CharacterString>
                          </gmd:description>
                          <gmd:function>
                            <gmd:CI_OnLineFunctionCode codeList="https://data.noaa.gov/resources/iso19139/schema/resources/Codelist/gmxCodelists.xml#CI_OnLineFunctionCode" codeListValue="information">information</gmd:CI_OnLineFunctionCode>
                          </gmd:function>
                        </gmd:CI_OnlineResource>
                      </gmd:onlineResource>
                    </gmd:CI_Contact>
                  </gmd:contactInfo>
                  <gmd:role>
                    <gmd:CI_RoleCode codeList="https://data.noaa.gov/resources/iso19139/schema/resources/Codelist/gmxCodelists.xml#CI_RoleCode" codeListValue="custodian">custodian</gmd:CI_RoleCode>
                  </gmd:role>
                </gmd:CI_ResponsibleParty>
              </gmd:citedResponsibleParty>
            </gmd:CI_Citation>
          </gmd:thesaurusName>
        </gmd:MD_Keywords>
      </gmd:descriptiveKeywords>
      <gmd:descriptiveKeywords xlink:title="WDS Project Keyword">
        <gmd:MD_Keywords xsi:schemaLocation="http://www.isotc211.org/2005/gmi https://data.noaa.gov/resources/iso19139/schema.xsd" uuid="62b487f4-c728-42b5-b24a-dbd7cc17c8e6">
          <gmd:keyword>
            <gco:CharacterString>ICSU-WDS &gt; International Council for Science - World Data System</gco:CharacterString>
          </gmd:keyword>
          <gmd:type>
            <gmd:MD_KeywordTypeCode codeList="https://data.noaa.gov/resources/iso19139/schema/resources/Codelist/gmxCodelists.xml#MD_KeywordTypeCode" codeListValue="project">project</gmd:MD_KeywordTypeCode>
          </gmd:type>
          <gmd:thesaurusName xlink:title="GCMD Project Keywords">
            <gmd:CI_Citation uuid="9f0de6e5-428b-11df-9879-0800200c9a66">
              <gmd:title>
                <gco:CharacterString>Global Change Master Directory (GCMD) Project Keywords</gco:CharacterString>
              </gmd:title>
              <gmd:date>
                <gmd:CI_Date>
                  <gmd:date>
                    <gco:Date>2020-01-09</gco:Date>
                  </gmd:date>
                  <gmd:dateType>
                    <gmd:CI_DateTypeCode codeList="https://data.noaa.gov/resources/iso19139/schema/resources/Codelist/gmxCodelists.xml#CI_DateTypeCode" codeListValue="publication">publication</gmd:CI_DateTypeCode>
                  </gmd:dateType>
                </gmd:CI_Date>
              </gmd:date>
              <gmd:edition>
                <gco:CharacterString>9.1</gco:CharacterString>
              </gmd:edition>
              <gmd:citedResponsibleParty xlink:title="GCMD Landing Page">
                <gmd:CI_ResponsibleParty uuid="1edb41d0-428a-11df-9879-0800200c9a66">
                  <gmd:organisationName>
                    <gco:CharacterString>Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA)</gco:CharacterString>
                  </gmd:organisationName>
                  <gmd:contactInfo>
                    <gmd:CI_Contact>
                      <gmd:onlineResource>
                        <gmd:CI_OnlineResource>
                          <gmd:linkage>
                            <gmd:URL>https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords</gmd:URL>
                          </gmd:linkage>
                          <gmd:name>
                            <gco:CharacterString>GCMD Keyword Forum Page</gco:CharacterString>
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                          <gmd:description>
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    </gmd:DQ_DataQuality>
  </gmd:dataQualityInfo>
  <gmd:metadataMaintenance>
    <gmd:MD_MaintenanceInformation>
      <gmd:maintenanceAndUpdateFrequency>
        <gmd:MD_MaintenanceFrequencyCode codeList="https://data.noaa.gov/resources/iso19139/schema/resources/Codelist/gmxCodelists.xml#MD_MaintenanceFrequencyCode" codeListValue="asNeeded">asNeeded</gmd:MD_MaintenanceFrequencyCode>
      </gmd:maintenanceAndUpdateFrequency>
      <gmd:maintenanceNote>
        <gco:CharacterString>Modified for compliance to NCEI Template v1.2.</gco:CharacterString>
      </gmd:maintenanceNote>
    </gmd:MD_MaintenanceInformation>
  </gmd:metadataMaintenance>
  <gmi:acquisitionInformation>
    <gmi:MI_AcquisitionInformation>
      <gmi:instrument>
        <gmi:MI_Instrument>
          <gmi:identifier gco:nilReason="inapplicable" />
          <gmi:type>
            <gco:CharacterString>Multibeam Echosounder Swath Bathymetry System</gco:CharacterString>
          </gmi:type>
        </gmi:MI_Instrument>
      </gmi:instrument>
      <gmi:instrument>
        <gmi:MI_Instrument>
          <gmi:identifier gco:nilReason="inapplicable" />
          <gmi:type>
            <gco:CharacterString>Multibeam Echosounder Backscatter System</gco:CharacterString>
          </gmi:type>
        </gmi:MI_Instrument>
      </gmi:instrument>
      <gmi:instrument>
        <gmi:MI_Instrument>
          <gmi:identifier gco:nilReason="inapplicable" />
          <gmi:type>
            <gco:CharacterString>Sidescan Sonar System</gco:CharacterString>
          </gmi:type>
        </gmi:MI_Instrument>
      </gmi:instrument>
    </gmi:MI_AcquisitionInformation>
  </gmi:acquisitionInformation>
</gmi:MI_Metadata>