<?xml version="1.0" encoding="UTF-8"?>
<metadata>
  <idinfo>
    <citation>
      <citeinfo>
        <origin>PRISM Climate Group at Oregon State University</origin>
        <pubdate>20191018</pubdate>
        <title>United States Daily Minimum Vapor Pressure Deficit, May 18, 1985 (800m; 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 May 18, 1985.  Contains
      spatially gridded daily minimum vapor pressure deficit at 800m 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 minimum vapor pressure deficit for May 18,
      1985.</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>19850518</begdate>
          <enddate>19850518</enddate>
        </rngdates>
      </timeinfo>
      <current>observed</current>
    </timeperd>
    <status>
      <progress>complete</progress>
      <update>as needed</update>
    </status>
    <spdom>
      <descgeog>Conterminous U.S.</descgeog>
      <bounding>
        <westbc>-125.0208333</westbc>
        <eastbc>-66.4791667</eastbc>
        <northbc>49.9375000</northbc>
        <southbc>24.0625000</southbc>
      </bounding>
    </spdom>
    <keywords>
      <stratum>
        <stratkey>minimum vapor pressure deficit</stratkey>
      </stratum>
    </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 some or all of the following sources: 1) National
    Weather Service (NWS) Cooperative (COOP) stations, 2) Natural Resources Conservation Service
    (NRCS) SNOTEL, 3) United States Forest Service (USFS) and Bureau of Land Management (BLM)
    RAWS Stations, 4) Bureau of Reclemation (AGRIMET) stations, 5) California Data Exchange Center
    (CDEC) stations, 6) Storage guages, 7) NRCS Snowcourse stations, 8) Other State and local
    station networks, 9) Estimated station data, 10) Canadian stations, 11) Upper air stations,
    12) NWS/Federal Aviation Administration (FAA) Automated surface observation stations (ASOS),
    and 13) CoCoRaHS (Community Collaborative Rain, Hail, and Snow Network) stations. All COOP
    station data were subjected to quality control checks by the National Climatic Data Center
    (NCDC). All COOP, SNOTEL and other data were subjected to further quality control checks
    by PRISM Climate Group at Oregon State University.</logic>
    <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>
  </dataqual>
  <spdoinfo>
    <direct>raster</direct>
  </spdoinfo>
  <spref>
    <horizsys>
      <geograph>
        <latres>0.00833333</latres>
        <longres>0.00833333</longres>
        <geogunit>Decimal degrees</geogunit>
      </geograph>
      <planar>
        <planci>
          <plance>Row and Column</plance>
          <coordrep>
            <absres>0.00833333</absres>
            <ordres>0.00833333</ordres>
          </coordrep>
        </planci>
      </planar>
      <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>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.</enttypds>
        <enttypds>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 minimum vapor pressure deficit (COG format)</attrlabl>
        <attrdef>Spatially gridded daily minimum vapor pressure deficit values</attrdef>
        <attrdomv>
          <rdom>
            <rdommin>0</rdommin>
            <rdommax>100</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>USA</state>
          <postal>Oregon</postal>
          <country>97330</country>
        </cntaddr>
        <cntvoice>(541) 737-2531</cntvoice>
        <cntemail>prism_orders@nacse.org</cntemail>
      </cntinfo>
    </distrib>
    <distliab>none</distliab>
    <stdorder>
      <fees>none</fees>
    </stdorder>
  </distinfo>
  <metainfo>
    <metd>20191018</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>Oregon</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>
  <mercury>
    <mercury_status>draft</mercury_status>
  </mercury>
</metadata>
