<?xml version="1.0" encoding="UTF-8"?>
<metadata>
  <idinfo>
    <citation>
      <citeinfo>
        <origin>PRISM Climate Group at Oregon State University</origin>
        <pubdate>20201214</pubdate>
        <title>United States Daily Maximum Vapor Pressure Deficit, June 12, 2020 (4km; COG)</title>
        <geoform>maps and data</geoform>
        <pubinfo>
          <pubplace>Corvallis, OR, USA</pubplace>
          <publish>PRISM Climate Group at Oregon State University</publish>
        </pubinfo>
        <onlink>prism.oregonstate.edu</onlink>
      </citeinfo>
    </citation>
    <descript>
      <abstract>Daily dataset covering the conterminous U.S., for June 12, 2020.  Contains spatially gridded daily maximum vapor pressure deficit at 4km grid cell resolution. Distribution of the point measurements to the spatial grid was accomplished using the PRISM model, developed and applied by Dr. Christopher Daly of the PRISM Climate Group at Oregon State University.</abstract>
      <purpose>Display and/or analysis requiring spatially distributed daily maximum vapor pressure deficit for June 12, 2020.</purpose>
      <supplinf>There are many methods of interpolating climate from monitoring stations to grid points. Some provide estimates of acceptable accuracy in flat terrain, but few have been able to adequately explain the extreme, complex variations in climate that occur in mountainous regions. Significant progress in this area has been achieved through the development of PRISM (Parameter-elevation Regressions on Independent Slopes Model). PRISM is an analytical model that uses point data and an underlying grid such as a digital elevation model (DEM) or a 30 yr climatological average (e.g., 1981-2010 average) to generate gridded estimates of daily precipitation and temperature (as well as other climatic parameters). PRISM is well suited to regions with mountainous terrain, because it incorporates a conceptual framework that addresses the spatial scale and pattern of orographic processes. Grids were modeled on a daily basis.</supplinf>
    </descript>
    <timeperd>
      <timeinfo>
        <rngdates>
          <begdate>20200612</begdate>
          <enddate>20200612</enddate>
        </rngdates>
      </timeinfo>
      <current>observed</current>
    </timeperd>
    <status>
      <progress>complete</progress>
      <update>as needed</update>
    </status>
    <spdom>
      <bounding>
        <westbc>-125.0208333</westbc>
        <eastbc>-66.4791667</eastbc>
        <northbc>49.9375000</northbc>
        <southbc>24.0625000</southbc>
      </bounding>
    </spdom>
    <keywords>
      <theme>
        <themekt>PRISM Climate Group</themekt>
        <themekey>maximum vapor pressure deficit</themekey>        
      </theme>
      <place>
        <placekt>US Census Bureau</placekt>    
        <placekey>Conterminous US</placekey>
      </place>
    </keywords>
    <accconst>Access pursuant to license agreement</accconst>
    <useconst>Acknowledgement of the following agencies in products derived from these data: PRISM Climate Group at Oregon State University.</useconst>
  </idinfo>
  <dataqual>
    <attracc>
      <attraccr>Similar quality assurance procedures were used with all input data sets.</attraccr>
    </attracc>
    <logic>Point estimates originated from many federal, state, and local weather networks.  A list of networks is available from http://www.prism.oregonstate.edu/documents/PRISM_datasets.pdf.  All station data were subjected to quality control checks by the PRISM Climate Group at Oregon State University.</logic>
    <complete>This dataset is considered complete. Please view the logic section of this document for further information.</complete>
    <posacc>
      <horizpa>
        <horizpar>Accuracy of this data set is based on the original specification of the Defense Mapping Agency (DMA) 1 degree digital elevation models (DEM). The stated accuracy of the original DEMs are 130 m circular error with 90% probability.</horizpar>
      </horizpa>
    </posacc>
    <lineage>
      <srcinfo>
        <srccite>
          <citeinfo>
            <origin>PRISM Climate Group</origin>
            <pubdate>20201214</pubdate>
            <title>United States Daily Maximum Vapor Pressure Deficit, June 12, 2020 (4km; COG)</title>
          </citeinfo>
        </srccite>
        <typesrc>digital file</typesrc>
        <srctime>
          <timeinfo>
            <rngdates>
              <begdate>20200612</begdate>
              <enddate>20200612</enddate>
            </rngdates>
          </timeinfo>
          <srccurr>publication date</srccurr>
          </srctime>
        <srccitea>PRISM Climate Group</srccitea>
        <srccontr>Please view the logic section of this document for further information.</srccontr>
        </srcinfo>
      <procstep>
        <procdesc>This data set was created via the PRISM modeling process. Please view the abstract section of this document for more information.</procdesc>
        <srcused>PRISM Climate Group</srcused>
        <procdate>20201214</procdate>
      </procstep>
  </lineage>
  </dataqual>
  <spdoinfo>
    <direct>raster</direct>
  </spdoinfo>
  <spref>
    <horizsys>
      <geograph>
        <latres>0.04166667</latres>
        <longres>0.04166667</longres>
        <geogunit>Decimal degrees</geogunit>
      </geograph>
      <geodetic>
        <horizdn>North American Datum of 1983</horizdn>
        <ellips>Geodetic Reference System 80</ellips>
        <semiaxis>6378137</semiaxis>
        <denflat>298.257</denflat>
      </geodetic>
    </horizsys>
  </spref>
  <eainfo>
    <detailed>
      <enttyp>
        <enttypl>Raster data representing climate variables</enttypl>
        <enttypd>Spatially gridded values</enttypd>
        <enttypds>
            [1] Daly, C., Halbleib, M., Smith, J.I., Gibson, W.P., Doggett, M.K., Taylor, G.H., Curtis, J., and Pasteris, P.A. 2008. Physiographically-sensitive mapping of temperature and precipitation across the conterminous United States. International Journal of Climatology, 28: 2031-2064.
            [2] Daly, C., J.I. Smith, and K.V. Olson.  2015.  Mapping atmospheric moisture climatologies across the conterminous United States. PloS ONE 10(10):e0141140. doi:10.1371/journal.pone.0141140.
        </enttypds>
      </enttyp>
      <attr>
        <attrlabl>Daily maximum vapor pressure deficit (COG format)</attrlabl>
        <attrdef>Spatially gridded daily maximum vapor pressure deficit values</attrdef>
        <attrdefs>PRISM Climate Group</attrdefs>
        <attrdomv>
          <rdom>
            <rdommin>0</rdommin>
            <rdommax>150</rdommax>
            <attrunit>hPa</attrunit>
          </rdom>
        </attrdomv>
      </attr>
    </detailed>
  </eainfo>
  <distinfo>
    <distrib>
      <cntinfo>
        <cntperp>
          <cntper>PRISM Climate Group at Oregon State University</cntper>
        </cntperp>
        <cntaddr>
          <addrtype>mailing and physical</addrtype>
          <address>NACSE, 2001 Kelley Engr Center</address>
          <city>Oregon State University</city>
          <state>OR</state>
          <postal>97331</postal>
          <country>USA</country>
        </cntaddr>
        <cntvoice>(541) 737-2531</cntvoice>
        <cntemail>prism_orders@nacse.org</cntemail>
      </cntinfo>
    </distrib>
    <distliab>none</distliab>
  </distinfo>
  <metainfo>
    <metd>20201214</metd>
    <metc>
      <cntinfo>
        <cntperp>
          <cntper>Matthew Doggett</cntper>
          <cntorg>PRISM Climate Group</cntorg>
        </cntperp>
        <cntaddr>
          <addrtype>mailing and physical</addrtype>
          <address>NACSE, 2001 Kelley Engr Center</address>
          <city>Oregon State University</city>
          <state>OR</state>
          <postal>97331</postal>
          <country>USA</country>
        </cntaddr>
        <cntvoice>(541) 737-2531</cntvoice>
        <cntemail>doggett@nacse.org</cntemail>
      </cntinfo>
    </metc>
    <metstdn>FDGC Content Standard for Digital Geospatial Metadata and Biological Data Profile</metstdn>
    <metstdv>FDGC-STD-001-1998</metstdv>
  </metainfo>
</metadata>
