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            <gmd:MD_DimensionNameTypeCode codeList="http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#MD_DimensionNameTypeCode" codeListValue="vertical">vertical</gmd:MD_DimensionNameTypeCode>
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                    <gco:Date>2007-08-27</gco:Date>
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                    <gmd:CI_DateTypeCode codeList="https://data.noaa.gov/resources/iso19139/schema/resources/Codelist/gmxCodelists.xml#CI_DateTypeCode" codeListValue="revision">revision</gmd:CI_DateTypeCode>
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                  <gmd:organisationName gco:nilReason="withheld" />
                  <gmd:contactInfo>
                    <gmd:CI_Contact>
                      <gmd:onlineResource>
                        <gmd:CI_OnlineResource>
                          <gmd:linkage>
                            <gmd:URL>https://epsg.org/crs_4326/WGS-84.html</gmd:URL>
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                          <gmd:name>
                            <gco:CharacterString>WGS 84</gco:CharacterString>
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                          <gmd:description>
                            <gco:CharacterString>GML of World Geodetic System 1984 coordinate reference system.</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:CI_ResponsibleParty>
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              <gmd:citedResponsibleParty xlink:title="EPSG Registry">
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                    <gmd:CI_Contact>
                      <gmd:onlineResource>
                        <gmd:CI_OnlineResource>
                          <gmd:linkage>
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                          <gmd:name>
                            <gco:CharacterString>European Petroleum Survey Group Geodetic Parameter Registry</gco:CharacterString>
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                          <gmd:description>
                            <gco:CharacterString>Registry that accesses the EPSG Geodetic Parameter Dataset, which is a structured dataset of Coordinate Reference Systems and Coordinate Transformations.</gco:CharacterString>
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        </gmd:RS_Identifier>
      </gmd:referenceSystemIdentifier>
    </gmd:MD_ReferenceSystem>
  </gmd:referenceSystemInfo>
  <!--Mean Sea Level, vertical units: meters-->
  <gmd:referenceSystemInfo xlink:title="MSL">
    <gmd:MD_ReferenceSystem uuid="5c1683f2-0c91-46ac-9ecf-07fc5de88e00">
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        <gmd:RS_Identifier>
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                <gco:CharacterString>Mean Sea Level depth</gco:CharacterString>
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                <gco:CharacterString>MSL depth</gco:CharacterString>
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                <gmd:CI_Date>
                  <gmd:date>
                    <gco:Date>2012-08-10</gco:Date>
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                    <gmd:CI_DateTypeCode codeList="https://data.noaa.gov/resources/iso19139/schema/resources/Codelist/gmxCodelists.xml#CI_DateTypeCode" codeListValue="revision">revision</gmd:CI_DateTypeCode>
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                  <gmd:organisationName gco:nilReason="withheld" />
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                    <gmd:CI_Contact>
                      <gmd:onlineResource>
                        <gmd:CI_OnlineResource>
                          <gmd:linkage>
                            <gmd:URL>https://epsg.org/crs_5715/MSL-depth.html</gmd:URL>
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                          <gmd:name>
                            <gco:CharacterString>MSL depth</gco:CharacterString>
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                          <gmd:description>
                            <gco:CharacterString>GML for Vertical CRS in EPGS Registry.</gco:CharacterString>
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                          <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:URL>https://epsg.org/home.html</gmd:URL>
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                            <gco:CharacterString>European Petroleum Survey Group Geodetic Parameter Registry</gco:CharacterString>
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                          <gmd:description>
                            <gco:CharacterString>Registry that accesses the EPSG Geodetic Parameter Dataset, which is a structured dataset of Coordinate Reference Systems and Coordinate Transformations.</gco:CharacterString>
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                      </gmd:onlineResource>
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                    <gmd:CI_RoleCode codeList="https://data.noaa.gov/resources/iso19139/schema/resources/Codelist/gmxCodelists.xml#CI_RoleCode" codeListValue="publisher">publisher</gmd:CI_RoleCode>
                  </gmd:role>
                </gmd:CI_ResponsibleParty>
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        </gmd:RS_Identifier>
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  </gmd:referenceSystemInfo>
  <gmd:identificationInfo>
    <gmd:MD_DataIdentification>
      <gmd:citation>
        <gmd:CI_Citation>
          <gmd:title>
            <gco:CharacterString>Mariana Trench 6 arc-second Bathymetric Digital Elevation Model</gco:CharacterString>
          </gmd:title>
          <gmd:date>
            <gmd:CI_Date>
              <gmd:date>
                <gco:Date>2013-02-14</gco:Date>
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          <gmd:citedResponsibleParty xlink:title="NCEI (publisher)">
            <gmd:CI_ResponsibleParty xsi:schemaLocation="http://www.isotc211.org/2005/gmi https://data.noaa.gov/resources/iso19139/schema.xsd" uuid="f5f40828-3d4a-42fa-b938-d3b5f965b1b7">
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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:citedResponsibleParty>
            <gmd:CI_ResponsibleParty xsi:schemaLocation="http://www.isotc211.org/2005/gmi https://data.noaa.gov/resources/iso19139/schema.xsd" uuid="A24B6AFE-F5DB-CFE7-9A73B800725AF258">
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                <gmd:CI_Contact>
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                    <gmd:CI_OnlineResource>
                      <gmd:linkage>
                        <gmd:URL>https://www.ngdc.noaa.gov/mgg/bathymetry/relief.html</gmd:URL>
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                        <gco:CharacterString>Project web page.</gco:CharacterString>
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        <gco:CharacterString>NOAA's National Geophysical Data Center (NGDC) created a bathymetric digital elevation model (DEM) for the Mariana Trench and adjacent seafloor in the Western Pacific Ocean. Bathymetric data used in DEM compilation were obtained from various sources, including internation, federal and academic partners. The DEM is referenced to the horizontal datum of World Geodetic System 1984 (WGS 84) and the vertical datum of sea level. Grid spacings for the Mariana Trench DEM is 6 arc-seconds (~180 meters). Please note that while positive elevations (elevations greater than 0 meters) are present in the DEM over 'dry' land (i.e. islands such as Guam and the Northern Mariana Islands), they should be ignored as the focus of DEM development was solely in the bathymetric realm.</gco:CharacterString>
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        <gco:CharacterString>Developed for the Mississippi State University Geosystems Research Institute and NOAA National Marine Fisheries Service to support scientific visualization efforts.</gco:CharacterString>
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            <gco:CharacterString>DEM Information</gco:CharacterString>
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          <gmd:contactInfo>
            <gmd:CI_Contact>
              <gmd:address>
                <gmd:CI_Address>
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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:resourceMaintenance>
        <gmd:MD_MaintenanceInformation>
          <gmd:maintenanceAndUpdateFrequency>
            <gmd:MD_MaintenanceFrequencyCode codeList="http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#MD_MaintenanceFrequencyCode" codeListValue="asNeeded">asNeeded</gmd:MD_MaintenanceFrequencyCode>
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        </gmd:MD_MaintenanceInformation>
      </gmd:resourceMaintenance>
      <gmd:graphicOverview>
        <gmd:MD_BrowseGraphic>
          <gmd:fileName>
            <gco:CharacterString>https://maps.ngdc.noaa.gov/thumbnails/DEM/4870.png</gco:CharacterString>
          </gmd:fileName>
          <gmd:fileDescription>
            <gco:CharacterString>Thumbnail of DEM</gco:CharacterString>
          </gmd:fileDescription>
          <gmd:fileType>
            <gco:CharacterString>PNG</gco:CharacterString>
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        </gmd:MD_BrowseGraphic>
      </gmd:graphicOverview>
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          <gmd:keyword>
            <gco:CharacterString>Earth Science &gt; Oceans &gt; Bathymetry/Seafloor Topography &gt; Seafloor Topography</gco:CharacterString>
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          </gmd:type>
          <gmd:thesaurusName>
            <gmd:CI_Citation>
              <gmd:title>
                <gco:CharacterString>Global Change Master Directory (GCMD) Science and Services Keywords</gco:CharacterString>
              </gmd:title>
              <gmd:date gco:nilReason="unknown" />
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          <gmd:keyword>
            <gco:CharacterString>Models/Analyses &gt; DEM &gt; Digital Elevation Model</gco:CharacterString>
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                <gco:DateTime>2012-12-15T00:00:00</gco:DateTime>
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                      <gmd:contactInstructions>
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              <gmd:dateTime>
                <gco:DateTime>2012-12-15T00:00:00</gco:DateTime>
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          <gmd:processStep>
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                <gco:DateTime>2012-12-15T00:00:00</gco:DateTime>
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          <gmd:processStep>
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                              <gmd:linkage>
                                <gmd:URL>http://ccom.unh.edu/theme/law-sea/mariana-trench-pacific-ocean</gmd:URL>
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                            <gmd:CI_OnlineResource>
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