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      <gmd:resourceConstraints xlink:title="NCEI Data Citation Statement">
        <gmd:MD_LegalConstraints>
          <gmd:useConstraints>
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            <gco:CharacterString>Distribution liability: NOAA and NCEI make no warranty, expressed or implied, regarding these data, nor does the fact of distribution constitute such a warranty. NOAA and NCEI cannot assume liability for any damages caused by any errors or omissions in these data. If appropriate, NCEI can only certify that the data it distributes are an authentic copy of the records that were accepted for inclusion in the NCEI archives.</gco:CharacterString>
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      </gmd:resourceConstraints>
      <gmd:resourceConstraints>
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                            <gmd:URL>https://www.ncei.noaa.gov/archive/accession/0171666/about/qcscd_manual_v1.pdf</gmd:URL>
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                            <gco:CharacterString>Reference Manual for Quality Control of Subsurface Currents Data (QCSCD)</gco:CharacterString>
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          <gmd:distributorContact>
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                <gmx:Anchor xlink:href="https://ror.org/04r0wrp59" xlink:actuate="onRequest">NOAA National Centers for Environmental Information</gmx:Anchor>
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                      <gmd:voice>
                        <gco:CharacterString>+1-301-713-3277</gco:CharacterString>
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              <gmd:orderingInstructions>
                <gco:CharacterString>Contact NCEI for other distribution options and instructions.</gco:CharacterString>
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                  <gmd:name>
                    <gco:CharacterString>FTP</gco:CharacterString>
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                  <gmd:description>
                    <gco:CharacterString>These data are available through the File Transfer Protocol (FTP). FTP is no longer supported by most internet browsers. You may copy and paste the FTP link to the data into an FTP client (e.g., FileZilla or WinSCP).</gco:CharacterString>
                  </gmd:description>
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                    <gmd:CI_OnLineFunctionCode codeList="https://data.noaa.gov/resources/iso19139/schema/resources/Codelist/gmxCodelists.xml#CI_OnLineFunctionCode" codeListValue="download">download</gmd:CI_OnLineFunctionCode>
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                  <gmd:description>
                    <gco:CharacterString>Navigate directly to the URL for data access and direct download.</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="download">download</gmd:CI_OnLineFunctionCode>
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                  <gmd:applicationProfile>
                    <gco:CharacterString>Web browsers can browse THREDDS Data Servers and specialized THREDDS software can enable more sophisticated data access and visualizations.</gco:CharacterString>
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                    <gco:CharacterString>THREDDS</gco:CharacterString>
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                    <gco:CharacterString>Navigate directly to the URL for a descriptive web page with download links.</gco:CharacterString>
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              <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:MD_MaintenanceInformation>
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            <gco:CharacterString>Acoustic Doppler Current Profiler

The Acoustic Doppler Current Profiler (ADCP) measures currents beneath a ship while underway. Sound signals sent from the moving ship bounce back to receivers aboard the ship. This provides a profile of water movement relative to the ship-precise modern navigation, allowing the ship's motion to be subtracted from the data. These devices are also used on moorings and profilers and, along with acoustic backscattering, measure animal biomass. Particles in the path of the sound waves, mostly plankton, reflect a small part of the sound energy back toward receivers, allowing researchers to make remote estimates of the sizes and numbers of animals present in the water column. Before the 1970's, the most technologically advanced instrument used to measure water velocity was known as a Doppler speed log. This evolved into the first commercial ADCP, produced in the mid-1970's, which used averaging. Later in the 1970's, the first vessel-mounted ADCP was developed to measure water velocity more accurately and to allow measurement in range cells over a depth profile.

As instruments evolved, so did new techniques in Doppler signal processing. Initially, Doppler speed logs used simple analog signal processing methods, which are still used in some commercial speed logs today. However, the first ADCPs incorporated analog-to-digital signal conversion over a narrow communication bandwidth. Around 1990, this technique was developed into broadband signal processing. Since then, broadband ADCPs have been able to generate very accurate, real-time velocity measurements.</gco:CharacterString>
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            <gco:CharacterString>current meter</gco:CharacterString>
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            <gco:CharacterString>current meter</gco:CharacterString>
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            <gco:CharacterString>current meter - PCM</gco:CharacterString>
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            <gco:CharacterString>profiling current meter

current meter that is lowered (and perhaps raised) throught he water column.</gco:CharacterString>
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            <gco:CharacterString>radar - high frequency oceanographic</gco:CharacterString>
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