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<gmd:URL>http://www.nws.noaa.gov/ohd/hdsc/On-line_reports/TM-Hydro35/Technical%20Memorandum%20NWS%20Hyro-35_1.pdf</gmd:URL>\n                          </gmd:linkage>\n                        </gmd:CI_OnlineResource>\n                      </gmd:onlineResource>\n                    </gmd:CI_Contact>\n                  </gmd:contactInfo>\n                  <gmd:role gco:nilReason=\"inapplicable\"/>\n                </gmd:CI_ResponsibleParty>\n              </gmd:citedResponsibleParty>\n              <gmd:presentationForm>\n                <gmd:CI_PresentationFormCode codeList=\"http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#CI_PresentationFormCode\" codeListValue=\"documentDigital\">documentDigital</gmd:CI_PresentationFormCode>\n              </gmd:presentationForm>\n              <gmd:series>\n                <gmd:CI_Series>\n                  <gmd:name>\n                    <gco:CharacterString>Technical Memorandum</gco:CharacterString>\n                  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</gmd:issueIdentification>\n                </gmd:CI_Series>\n              </gmd:series>\n            </gmd:CI_Citation>\n          </gmd:aggregateDataSetName>\n          <gmd:associationType>\n            <gmd:DS_AssociationTypeCode codeList=\"http://www.ngdc.noaa.gov/metadata/published/xsd/schema/resources/Codelist/gmxCodelists.xml#DS_AssociationTypeCode\" codeListValue=\"crossReference\">crossReference</gmd:DS_AssociationTypeCode>\n          </gmd:associationType>\n        </gmd:MD_AggregateInformation>\n      </gmd:aggregationInfo>\n      <gmd:spatialRepresentationType>\n        <gmd:MD_SpatialRepresentationTypeCode codeList=\"http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#MD_SpatialRepresentationTypeCode\" codeListValue=\"grid\">grid</gmd:MD_SpatialRepresentationTypeCode>\n      </gmd:spatialRepresentationType>\n      <gmd:language>\n        <gco:CharacterString>eng; USA</gco:CharacterString>\n      </gmd:language>\n      <gmd:topicCategory>\n        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Grid cell precipitation in inches*1000</gco:CharacterString>\n          </gmd:descriptor>\n          \n          <gmd:maxValue>\n            <gco:Real>9999999</gco:Real>\n          </gmd:maxValue>\n          <gmd:minValue>\n            <gco:Real>0</gco:Real>\n          </gmd:minValue>\n          <gmd:units>\n            <gml:UnitDefinition gml:id=\"d1e724\">\n              <gml:identifier codeSpace=\"local\">1000ths of inches</gml:identifier>\n              <gml:name>1000ths of inches</gml:name>\n            </gml:UnitDefinition>\n          </gmd:units>\n        </gmd:MD_Band>\n      </gmd:dimension>\n      <gmi:rangeElementDescription>\n        <gmi:MI_RangeElementDescription>\n          <gmi:name>\n            <gco:CharacterString>precipitation frequency grid cell value</gco:CharacterString>\n          </gmi:name>\n          <gmi:definition>\n            <gco:CharacterString>spatially gridded precipitation frequency estimates</gco:CharacterString>\n          </gmi:definition>\n          \n          <gmi:rangeElement>\n            <gco:Record>Sequential unique whole numbers that are automatically generated.</gco:Record>\n          </gmi:rangeElement>\n        </gmi:MI_RangeElementDescription>\n      </gmi:rangeElementDescription>\n    </gmi:MI_CoverageDescription>\n  </gmd:contentInfo>\n  <gmd:distributionInfo>\n    <gmd:MD_Distribution>\n      <gmd:distributionFormat>\n        <gmd:MD_Format>\n          <gmd:name>\n            <gco:CharacterString>ASCII</gco:CharacterString>\n          </gmd:name>\n          <gmd:version gco:nilReason=\"unknown\"/>\n        </gmd:MD_Format>\n      </gmd:distributionFormat>\n      <gmd:distributor>\n        <gmd:MD_Distributor>\n          <gmd:distributorContact>\n            <gmd:CI_ResponsibleParty>\n              <gmd:organisationName>\n                <gco:CharacterString>NOAA/NWS/OHD/Hydrometeorological Design Studies Center</gco:CharacterString>\n              </gmd:organisationName>\n              <gmd:contactInfo>\n          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<gco:CharacterString>Silver Spring</gco:CharacterString>\n                      </gmd:city>\n                      <gmd:administrativeArea>\n                        <gco:CharacterString>MD</gco:CharacterString>\n                      </gmd:administrativeArea>\n                      <gmd:postalCode>\n                        <gco:CharacterString>20910</gco:CharacterString>\n                      </gmd:postalCode>\n                      <gmd:country>\n                        <gco:CharacterString>USA</gco:CharacterString>\n                      </gmd:country>\n                      <gmd:electronicMailAddress>\n                        <gco:CharacterString>hdsc.questions@noaa.gov</gco:CharacterString>\n                      </gmd:electronicMailAddress>\n                    </gmd:CI_Address>\n                  </gmd:address>\n                </gmd:CI_Contact>\n              </gmd:contactInfo>\n              <gmd:role>\n                <gmd:CI_RoleCode 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</gmd:CI_OnlineResource>\n          </gmd:onLine>\n          <gmd:onLine>\n            <gmd:CI_OnlineResource>\n              <gmd:linkage>\n                <gmd:URL>orbXyrYY.ver2 (X = average recurrence interval, YY = duration; u = upper limit, l= lower limit)</gmd:URL>\n              </gmd:linkage>\n            </gmd:CI_OnlineResource>\n          </gmd:onLine>\n        </gmd:MD_DigitalTransferOptions>\n      </gmd:transferOptions>\n    </gmd:MD_Distribution>\n  </gmd:distributionInfo>\n  <gmd:dataQualityInfo>\n    <gmd:DQ_DataQuality>\n      <gmd:scope>\n        <gmd:DQ_Scope>\n          <gmd:level>\n            <gmd:MD_ScopeCode codeList=\"http://www.ngdc.noaa.gov/metadata/published/xsd/schema/resources/Codelist/gmxCodelists.xml#MD_ScopeCode\" codeListValue=\"dataset\">dataset</gmd:MD_ScopeCode>\n          </gmd:level>\n        </gmd:DQ_Scope>\n      </gmd:scope>\n      <gmd:report>\n        <gmd:DQ_CompletenessCommission>\n          <gmd:evaluationMethodDescription>\n            <gco:CharacterString>Observed point precipitation values originated from a variety of sources. All station data were subjected to quality control checks by the National Climatic Data Center (NCDC) and the Hydrometeorological Design Studies Center. Some data what was not already digitized by NCDC was done so by the National Weather Service.</gco:CharacterString>\n          </gmd:evaluationMethodDescription>\n          <gmd:result gco:nilReason=\"unknown\"/>\n        </gmd:DQ_CompletenessCommission>\n      </gmd:report>\n      <gmd:report>\n        <gmd:DQ_ConceptualConsistency>\n          <gmd:measureDescription>\n            <gco:CharacterString>All data were based on precipitation-reporting stations that had at least 20 years of hourly and/or 30 years of daily precipitation data between 1893 and 2002. Similar quality assurance procedures were used with all input data sets.</gco:CharacterString>\n          </gmd:measureDescription>\n          <gmd:result gco:nilReason=\"unknown\"/>\n        </gmd:DQ_ConceptualConsistency>\n      </gmd:report>\n      <gmd:lineage>\n        <gmd:LI_Lineage>\n          <gmd:processStep>\n            <gmi:LE_ProcessStep>\n              <gmd:description>\n                <gco:CharacterString>This spatial data set was prepared by spatially interpolating point precipitation frequency estimates. The precipitation frequency estimates were calculated using regional L-moment statistics based on an annual maximum data series. The spatial interpolation of the point precipitation frequency estimates was accomplished with PRISM coupled with a derivation process called the cascade, residual add-back (CRAB) procedure. So-called \"index flood,\" otherwise known as the mean annual maximum, grids were created using PRISM, Parameter-elevation Regressions on Independent Slopes Model, at Oregon State University. PRISM is an analytical tool that uses point data, a digital elevation model, and other spatial data sets to generate gridded estimates of climatic parameters. PRISM is uniquely designed and constantly updated to map climate in the most difficult situations, including high mountains, rain shadows, temperature inversions, coastal regions, and other complex climatic regimes. Meanwhile, CRAB is used to actually derive the precipitation frequency grids. CRAB is a derivation process that utilizes the strong, linear relationship between a particular duration and frequency (e.g. 50-year 24-hour) and the next higher frequency (e.g. 100-year 24-hour). In fact, within an L-moment region this relationship is constant and known as the Regional Growth Factor (RGF). With the CRAB procedure however, a global (all-region) relationship is developed based on actual observing-site data, then the linear relationship is applied to the preceding grid (i.e. 50-year 24-hour) to establish a first guess 100-year 24-hour grid. Knowing regional differences occur, residuals (predicted minus observed) are calculated for each observing-site and then normalized (divided by) by the preceding estimate (50-year 24-hour). These (point) normalized residuals are then spatially interpolated to a grid. The resultant grid is then un-normalized by multiplying it by the preceding grid to obtain a grid of actual residuals, in inches. The last step is to simply add the residual grid to the first guess grid to arrive at the final 100-year 24-hour grid. The process, as the term cascade implies, utilizes a previously derived grid to derive the next grid. So the same process is followed for deriving the 200-year 24-hour grid, but instead of the 50-year 24-hour grid being used as the predictor, the new 100-year 24-hour grid is used. For more details about the processes used to create this grid, please see the project quarterly reports posted here: &lt;http://www.nws.noaa.gov/ohd/hdsc/current-projects/project.html&gt; or the NOAA Atlas 14 Documention.</gco:CharacterString>\n              </gmd:description>\n              <gmd:dateTime>\n                <gco:DateTime>2006-08-17T00:00:00</gco:DateTime>\n              </gmd:dateTime>\n            </gmi:LE_ProcessStep>\n          </gmd:processStep>\n          <gmd:source>\n            <gmd:LI_Source>\n              <gmd:description>\n                <gco:CharacterString>Source Contribution: Location and values of known hourly precipitation amounts.Source Type: online</gco:CharacterString>\n              </gmd:description>\n              <gmd:sourceCitation>\n                <gmd:CI_Citation>\n                  <gmd:title>\n                    <gco:CharacterString>Hourly Precipitation Data</gco:CharacterString>\n                  </gmd:title>\n                  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All grids are in geographic coordinate system (WGS72 horizontal datum) and units are in 1000th of inches.","distribution":[{"@type":"dcat:Distribution","describedByType":"application/octet-steam","downloadURL":"HDSC PFDS;","mediaType":"placeholder/value"},{"@type":"dcat:Distribution","describedByType":"application/octet-steam","downloadURL":"orbXyrYY.ver2 (X = average recurrence interval, YY = duration; u = upper limit, l= lower limit)","mediaType":"placeholder/value"},{"@type":"dcat:Distribution","describedByType":"application/octet-steam","downloadURL":"http://www.srh.noaa.gov/lub/wx/precip_freq/precip_index.htm","mediaType":"placeholder/value"},{"@type":"dcat:Distribution","describedByType":"application/octet-steam","downloadURL":"http://www.nws.noaa.gov/ohd/hdsc/On-line_reports/TM-Hydro35/Technical%20Memorandum%20NWS%20Hyro-35_1.pdf","mediaType":"placeholder/value"},{"@type":"dcat:Distribution","accessURL":"http://www.nws.noaa.gov/ohd/hdsc/studies/prcpfreq.html","describedByType":"application/octet-steam"},{"@type":"dcat:Distribution","accessURL":"http://hdsc.nws.noaa.gov/hdsc/pfds/pfds_gis.html","describedByType":"application/octet-steam"}],"identifier":"gov.noaa.nws.ohd.hdsc: OHD-HDSC-NOAAAtlas14V2v2011-ORB","issued":"2006-08-17T00:00:00.000+00:00","keyword":["Atmosphere > Precipitation > Precipitation Frequency","Continent > North America > United States Of America","Vertical Location > Ground Layer","Atmosphere > Precipitation > Precipitation Frequency"],"language":[],"license":"https://creativecommons.org/publicdomain/zero/1.0/","modified":"2006-08-17T00:00:00.000+00:00","publisher":{"@type":"org:Organization","name":"NOAA/NWS/Office of Hydrologic Development, Hydrometeorological Design Studies Center"},"references":["http://www.srh.noaa.gov/lub/wx/precip_freq/precip_index.htm","http://www.nws.noaa.gov/ohd/hdsc/On-line_reports/TM-Hydro35/Technical%20Memorandum%20NWS%20Hyro-35_1.pdf","http://www.nws.noaa.gov/ohd/hdsc/studies/prcpfreq.html"],"rights":"otherRestrictions, unclassified","spatial":"-73.8714,31.95664,-91.5375,42.5296","temporal":"1863-04-01T00:00:00+00:00/2000-12-31T00:00:00+00:00","title":"Precipitation Frequency for Ohio River Basin, USA - NOAA Atlas 14 Volume 2"},"status":"error"}