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The ESSA satellites (ESSA-3, -5, -7, -9) were in operation from December 1966 through November 1972. They were equipped with the Advanced Vidicon Camera System (AVCS). In addition, ITOS-1 and NOAA-1 were equipped with the AVCS and were operational from January 1970 to August 1971. Only visible images are available during this time period. Quality varies throughout the 1960s time period. From October 1972 through March 1978, data from the NOAA satellites (NOAA-2, -3, -4, -5) were acquired. They were equipped with a Scanning Radiometer (SR) with both visible and infrared (IR) bands, so IR observations are available for this time period as well as visible. These were organized as cross-track scan lines.</gco:CharacterString>
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                            <gmd:URL>https://earthdata.nasa.gov/about/gcmd/global-change-master-directory-gcmd-keywords</gmd:URL>
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      <gmd:descriptiveKeywords>
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          <gmd:keyword>
            <gco:CharacterString>Vertical Location &gt; Troposphere</gco:CharacterString>
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            <gmd:MD_KeywordTypeCode codeList="https://data.noaa.gov/resources/iso19139/schema/resources/Codelist/gmxCodelists.xml#MD_KeywordTypeCode" codeListValue="stratum">stratum</gmd:MD_KeywordTypeCode>
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                <gco:CharacterString>Global Change Master Directory (GCMD) Location Keywords</gco:CharacterString>
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                  <gmd:date>
                    <gco:Date>2018</gco:Date>
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                  <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>
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                            <gmd:URL>https://earthdata.nasa.gov/about/gcmd/global-change-master-directory-gcmd-keywords</gmd:URL>
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                            <gco:CharacterString>HTTPS</gco:CharacterString>
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                            <gco:CharacterString>The information provided on this page seeks to define how the GCMD Keywords are structured, used and accessed. It also provides information on how users can participate in the further development of the keywords.</gco:CharacterString>
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      <gmd:descriptiveKeywords>
        <gmd:MD_Keywords>
          <gmd:keyword>
            <gco:CharacterString>NOAA OneStop Project</gco:CharacterString>
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            <gmd:MD_KeywordTypeCode codeList="https://data.noaa.gov/resources/iso19139/schema/resources/Codelist/gmxCodelists.xml#MD_KeywordTypeCode" codeListValue="project">project</gmd:MD_KeywordTypeCode>
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                <gco:CharacterString>Global Change Master Directory (GCMD) Project Keywords</gco:CharacterString>
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                  <gmd:date>
                    <gco:Date>2018</gco:Date>
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                  <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>
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                </gmd:CI_Date>
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                    <gmd:CI_Contact>
                      <gmd:onlineResource>
                        <gmd:CI_OnlineResource>
                          <gmd:linkage>
                            <gmd:URL>https://earthdata.nasa.gov/about/gcmd/global-change-master-directory-gcmd-keywords</gmd:URL>
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                            <gco:CharacterString>HTTPS</gco:CharacterString>
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                          <gmd:name>
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                            <gco:CharacterString>The information provided on this page seeks to define how the GCMD Keywords are structured, used and accessed. It also provides information on how users can participate in the further development of the keywords.</gco:CharacterString>
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      <gmd:descriptiveKeywords>
        <gmd:MD_Keywords>
          <gmd:keyword>
            <gco:CharacterString>AVCS &gt; Advanced Vidicon Camera System</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>SR &gt; Scanning Radiometer</gco:CharacterString>
          </gmd:keyword>
          <gmd:type>
            <gmd:MD_KeywordTypeCode codeList="https://data.noaa.gov/resources/iso19139/schema/resources/Codelist/gmxCodelists.xml#MD_KeywordTypeCode" codeListValue="instrument">instrument</gmd:MD_KeywordTypeCode>
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                <gco:CharacterString>Global Change Master Directory (GCMD) Instrument Keywords</gco:CharacterString>
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                <gmd:CI_Date>
                  <gmd:date>
                    <gco:Date>2018</gco:Date>
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                  <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>
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                    <gmd:CI_Contact>
                      <gmd:onlineResource>
                        <gmd:CI_OnlineResource>
                          <gmd:linkage>
                            <gmd:URL>https://earthdata.nasa.gov/about/gcmd/global-change-master-directory-gcmd-keywords</gmd:URL>
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                          <gmd:protocol>
                            <gco:CharacterString>HTTPS</gco:CharacterString>
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                          <gmd:name>
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            <gco:CharacterString>NOAA-1 &gt; National Oceanic &amp; Atmospheric Administration-1</gco:CharacterString>
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          <gmd:keyword>
            <gco:CharacterString>NOAA-2 &gt; National Oceanic &amp; Atmospheric Administration-2</gco:CharacterString>
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          <gmd:keyword>
            <gco:CharacterString>NOAA-3 &gt; National Oceanic &amp; Atmospheric Administration-3</gco:CharacterString>
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          <gmd:keyword>
            <gco:CharacterString>NOAA-4 &gt; National Oceanic &amp; Atmospheric Administration-4</gco:CharacterString>
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          <gmd:keyword>
            <gco:CharacterString>ESSA-3 &gt; Environmental Science Services Administration-3</gco:CharacterString>
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          <gmd:keyword>
            <gco:CharacterString>ESSA-5 &gt; Environmental Science Services Administration-5</gco:CharacterString>
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          <gmd:keyword>
            <gco:CharacterString>ESSA-7 &gt; Environmental Science Services Administration-7</gco:CharacterString>
          </gmd:keyword>
          <gmd:keyword>
            <gco:CharacterString>ESSA-9 &gt; Environmental Science Services Administration-9</gco:CharacterString>
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          <gmd:keyword>
            <gco:CharacterString>ITOS-1 &gt;      Improved TIROS Operational System</gco:CharacterString>
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          <gmd:keyword>
            <gco:CharacterString>NOAA-5 &gt; National Oceanic &amp; Atmospheric Administration-5</gco:CharacterString>
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                    <gco:Date>2018</gco:Date>
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            <gco:CharacterString>10 km - &lt; 50 km or approximately .09 degree - &lt; .5 degree</gco:CharacterString>
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              <gmd:title>
                <gco:CharacterString>Global Change Master Directory (GCMD) Horizontal Data Resolution Keywords</gco:CharacterString>
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                  <gmd:date>
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      <gmd:descriptiveKeywords>
        <gmd:MD_Keywords>
          <gmd:keyword>
            <gco:CharacterString>Daily - &lt; Weekly</gco:CharacterString>
          </gmd:keyword>
          <gmd:type>
            <gmd:MD_KeywordTypeCode codeList="https://data.noaa.gov/resources/iso19139/schema/resources/Codelist/gmxCodelists.xml#MD_KeywordTypeCode" codeListValue="dataResolution">dataResolution</gmd:MD_KeywordTypeCode>
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          <gmd:thesaurusName>
            <gmd:CI_Citation>
              <gmd:title>
                <gco:CharacterString>Global Change Master Directory (GCMD) Temporal Data Resolution Keywords</gco:CharacterString>
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              <gmd:date>
                <gmd:CI_Date>
                  <gmd:date>
                    <gco:Date>2018</gco:Date>
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                  <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>
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                </gmd:CI_Date>
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              <gmd:edition>
                <gco:CharacterString>Version 8.6</gco:CharacterString>
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                  <gmd:contactInfo>
                    <gmd:CI_Contact>
                      <gmd:onlineResource>
                        <gmd:CI_OnlineResource>
                          <gmd:linkage>
                            <gmd:URL>https://earthdata.nasa.gov/about/gcmd/global-change-master-directory-gcmd-keywords</gmd:URL>
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                          <gmd:protocol>
                            <gco:CharacterString>HTTPS</gco:CharacterString>
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                            <gco:CharacterString>Global Change Master Directory (GCMD) Keywords</gco:CharacterString>
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                            <gco:CharacterString>The information provided on this page seeks to define how the GCMD Keywords are structured, used and accessed. It also provides information on how users can participate in the further development of the keywords.</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:URL>https://earthdata.nasa.gov/about/gcmd/global-change-master-directory-gcmd-keywords</gmd:URL>
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            <gmd:MD_KeywordTypeCode codeList="https://data.noaa.gov/resources/iso19139/schema/resources/Codelist/gmxCodelists.xml#MD_KeywordTypeCode" codeListValue="theme">theme</gmd:MD_KeywordTypeCode>
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      </gmd:descriptiveKeywords>
      <gmd:resourceConstraints>
        <gmd:MD_Constraints>
          <gmd:useLimitation>
            <gco:CharacterString>Gaps may exist in the data due to sensor/satellite failure, missing data, or poor quality results.</gco:CharacterString>
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      </gmd:resourceConstraints>
      <gmd:resourceConstraints>
        <gmd:MD_LegalConstraints>
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            <gmd:MD_RestrictionCode codeList="https://data.noaa.gov/resources/iso19139/schema/resources/Codelist/gmxCodelists.xml#MD_RestrictionCode" codeListValue="otherRestrictions">otherRestrictions</gmd:MD_RestrictionCode>
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      <gmd:resourceConstraints xlink:title="Use Liability">
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          <gmd:useConstraints>
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            <gco:CharacterString>Use liability: NOAA and NCEI cannot provide any warranty as to the accuracy, reliability, or completeness of furnished data. Users assume responsibility to determine the usability of these data. The user is responsible for the results of any application of this data for other than its intended purpose.</gco:CharacterString>
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      <gmd:aggregationInfo>
        <gmd:MD_AggregateInformation>
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            <gmd:DS_AssociationTypeCode codeList="https://data.noaa.gov/resources/iso19139/schema/resources/Codelist/gmxCodelists.xml#DS_AssociationTypeCode" codeListValue="largerWorkCitation">largerWorkCitation</gmd:DS_AssociationTypeCode>
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    <gmd:MD_Distribution>
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        <gmd:MD_Distributor>
          <gmd:distributorContact xlink:title="NCEI (distributor)">
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