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          <srv:connectPoint>
            <gmd:CI_OnlineResource>
              <gmd:linkage>
                <gmd:URL>https://gis.ngdc.noaa.gov/arcgis/rest/services/web_mercator/trackline_combined_dynamic/MapServer</gmd:URL>
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                <gco:CharacterString>http</gco:CharacterString>
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                <gmd:URL>https://gis.ngdc.noaa.gov/arcgis/services/web_mercator/trackline_combined_dynamic/MapServer/WMSServer?request=GetCapabilities&amp;service=WMS</gmd:URL>
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                <gco:CharacterString>Capabilities document for Open Geospatial Consortium Web Map Service for Geophysical Trackline Data</gco:CharacterString>
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                <gmd:CI_OnLineFunctionCode codeList="https://data.noaa.gov/resources/iso19139/schema/resources/Codelist/gmxCodelists.xml#CI_OnLineFunctionCode" codeListValue="search">search</gmd:CI_OnLineFunctionCode>
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                    <gmd:CI_OnlineResource>
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                        <gmd:URL>https://www.ncei.noaa.gov/contact</gmd:URL>
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                        <gco:CharacterString>Information for contacts at NCEI.</gco:CharacterString>
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                <gco:CharacterString>Contact NCEI for other distribution options and instructions.</gco:CharacterString>
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                <gmd:CI_OnlineResource>
                  <gmd:linkage>
                    <gmd:URL>https://www.ncei.noaa.gov/metadata/geoportal/rest/metadata/item/gov.noaa.ngdc.mgg.seismic:KNOX17RR_SubbottomProfiler/html</gmd:URL>
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                  <gmd:name>
                    <gco:CharacterString>Metadata Landing Page</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:distributorTransferOptions>
            <gmd:MD_DigitalTransferOptions>
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                    <gco:CharacterString>Trackline Geophysical Data Viewer</gco:CharacterString>
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                    <gco:CharacterString>An interactive map of tracklines providing access to marine geophysical survey data (bathymetry, gravity, magnetics, seismics), and aeromagnetic surveys in the archive.</gco:CharacterString>
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                    <gmd:CI_OnLineFunctionCode codeListValue="search" codeList="https://data.noaa.gov/resources/iso19139/schema/resources/Codelist/gmxCodelists.xml#CI_OnLineFunctionCode">search</gmd:CI_OnLineFunctionCode>
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          <gmd:distributorTransferOptions>
            <gmd:MD_DigitalTransferOptions>
              <gmd:onLine>
                <gmd:CI_OnlineResource>
                  <gmd:linkage>
                    <gmd:URL>https://www.ngdc.noaa.gov/trackline/request/?surveyIds=KNOX17RR</gmd:URL>
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                    <gco:CharacterString>Request Trackline Data</gco:CharacterString>
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                  <gmd:description>
                    <gco:CharacterString>Download seismic data from this cruise.</gco:CharacterString>
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                    <gmd:CI_OnLineFunctionCode codeListValue="order" codeList="https://data.noaa.gov/resources/iso19139/schema/resources/Codelist/gmxCodelists.xml#">order</gmd:CI_OnLineFunctionCode>
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        </gmd:MD_Distributor>
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      <gmd:lineage>
        <gmd:LI_Lineage>
          <gmd:processStep>
            <gmi:LE_ProcessStep>
              <gmd:description>
                <gco:CharacterString>NOAA created the National Centers for Environmental Information (NCEI) by merging NOAA's National Climatic Data Center (NCDC), National Geophysical Data Center (NGDC), and National Oceanographic Data Center (NODC), including the National Coastal Data Development Center (NCDDC), per the Consolidated and Further Continuing Appropriations Act, 2015, Public Law 113-235. NCEI launched publicly on April 22, 2015.</gco:CharacterString>
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    <gmd:DQ_DataQuality>
      <gmd:scope>
        <gmd:DQ_Scope>
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            <gco:CharacterString>Horizontal positioning of the vessel was determined using Differential-aided DGPS integrated into a POS/MV model 320 version 3 system. Positioning is accurate to better than 5 meters (at 95% confidence) during all surveying. All positioning is referenced to the WGS84 ellipsoid Datum.</gco:CharacterString>
          </gmd:evaluationMethodDescription>
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        <gmd:DQ_AbsoluteExternalPositionalAccuracy>
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            <gco:CharacterString>Vertical Positional Accuracy Report</gco:CharacterString>
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    <gmd:MD_MaintenanceInformation>
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                          <gmd:linkage>
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                          </gmd:description>
                          <gmd:function>
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                        </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="resourceProvider" codeSpace="001">resourceProvider</gmd:CI_RoleCode>
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          <gmi:description>
            <gco:CharacterString>The Chirp 3260 is designed for full ocean depth work where high transmit output power is a requirement. The Chirp 3260's 5U rackmount case can be fitted with up to six 2kW transmitter modules to output up to 12kW of total system power. The most common arrangement used by the research community worldwide is one 3.5 kHz channel configured for 10KW paired together with a 2KW, 12 kHz channel.</gco:CharacterString>
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              <gmd:code>
                <gco:CharacterString>KNOX17RR</gco:CharacterString>
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          <gmi:parentOperation gco:nilReason="inapplicable" />
        </gmi:MI_Operation>
      </gmi:operation>
      <gmi:platform xlink:title="Roger Revelle (RR)">
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            <gco:CharacterString>R/V Roger Revelle (AGOR 24) is a 274-foot (83 meter) research ship operated by the Scripps Institution of Oceanography, a graduate division of the University of California, San Diego. It is the sister ship of the R/V Atlantis, Woods Hole Oceanographic Institution's deep submergence support ship that carries the submersible Alvin. Revelle is the second of four new-generation AGOR oceanographic ships built by the U.S. Navy for operation by American oceanographic institutions. R/V Roger Revelle has a cruising speed of 12 knots and carries 22 crewmembers and 37 scientists.</gco:CharacterString>
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          <gmi:sponsor xlink:title="Scripps Institution for Oceanography (owner)">
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          </gmi:sponsor>
          <gmi:instrument xlink:title="Kongsberg EM122 Multibeam Echosounder">
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              <gmi:type>
                <gco:CharacterString>Multibeam Echosounder</gco:CharacterString>
              </gmi:type>
              <gmi:description>
                <gco:CharacterString>EM 122 multibeam echosounder is a high performance echosounder for deep water mapping with up to 288 simultaneous beams. The EM 122 is designed to perform seabed mapping to full ocean depth with an unsurpassed resolution, coverage and accuracy. The system is cost effective, reliable, and easily operated. The design of the EM 122 is based on more than 50 years of hydrographic experience with echo sounders, sonars and underwater positioning for civilian and military use. It is the latest model in a series of deep sea multibeam echo sounders started with the EM 12 in 1990 and followed by the EM 121 and the EM 120, of which about 40 systems are operational. It uses the same transducers as in the EM 120 but with new electronics and software. Compared with the EM 120 the EM 122 has up to four times the resolution in terms of sounding density through inclusion of multiping capability and more than twice the number of detections per swath. High density signal processing is a major improvement, to keep the acoustic footprint size small even for the outer beams in the swath. In typical ocean depths a sounding spacing of about 50 m across and along is achievable. The achievable swath width of the EM 122 is in the order of 30,000 m, or about 25% more than possible with the EM 120. This is obtained by using long FM chirps which gains about 15 dB in signal to noise ratio compared to CW pulses. The EM 122 is a complete system. All necessary sensor interfaces, data displays for quality control and sensor calibration, seabed visualization, and data logging are a standard part of the system, as is integrated seabed acoustical imaging capability (side scan). Including a higher frequency multibeam echo sounder such as EM 710 with the EM 122 system can give a total system solution meeting the strictest IHO requirements for all water depths. As proven with the EM 120, an accuracy of better than 0.2% of depth in deep waters is readily achievable with the EM 122.</gco:CharacterString>
              </gmi:description>
            </gmi:MI_Instrument>
          </gmi:instrument>
        </gmi:MI_Platform>
      </gmi:platform>
    </gmi:MI_AcquisitionInformation>
  </gmi:acquisitionInformation>
</gmi:MI_Metadata>