<?xml version="1.0" encoding="iso-8859-1"?><!DOCTYPE metadata SYSTEM "http://www.fgdc.gov/metadata/fgdc-std-001-1998.dtd"><metadata>  <idinfo>    <citation>      <citeinfo>        <origin>James M. Dohm</origin>        <origin>Kenneth L. Tanaka</origin>        <origin>James A. Skinner, Jr.</origin>        <pubdate>TBD</pubdate>        <title>Geologic Map of the Metis Mons Quadrangle (V-6),        Venus</title>        <geoform>vector digital data</geoform>        <onlink>http://pubs.usgs.gov/sim/3158/</onlink>      </citeinfo>    </citation>    <descript>      <abstract>The Metis Mons quadrangle (V-6) is in the northern      hemisphere of Venus and extends from 50 to 75 degrees north      latitude and from 240 to 300 degrees east longitude. The      Magellan mission to Venus acquired synthetic aperture radar      (SAR) backscatter, emissivity, reflectance, and topographic      data for most of the planet. Image mosaics of radar      backscatter were the primary data set used to delineate the      boundaries of discrete geologic units and characterize their      appearance, morphology, and distribution. We have identified      a total of 27 geologic units in the Metis Mons map region      based on morphologic characteristics, geologic associations,      and stratigraphic relations. These can be subdivided into      five major material groups: mons materials, plains materials,      corona materials, tessera material, and crater      materials.</abstract>      <purpose>The main purpose of this map is to reconstruct the      geologic history of the Metis Mons quadrangle at a level of      detail commensurate with a scale of 1:5,000,000 using      Magellan data. We interpret four partly overlapping stages of      geologic activity, which collectively resulted in the      formation of tesserae, coronae (oriented along structure      belts), plains materials of varying ages, and four large      volcanic constructs. Scattered impact craters, small shields      and pancake-shaped domes, and isolated flows superpose the      tectonically deformed materials and appear to be the most      youthful materials in the map region. The overall geologic      sequence in the V-6 quadrangle represents a lowlands style of      resurfacing and tectonism that demonstrates broad magmatic      and tectonic evolution recorded in tessera and plains      materials, as well as local evolution of coronae and large      shield volcanoes.</purpose>    </descript>    <timeperd>      <timeinfo>        <sngdate>          <caldate>TBD</caldate>        </sngdate>      </timeinfo>      <current>publication date</current>    </timeperd>    <status>      <progress>Complete</progress>      <update>None planned</update>    </status>    <spdom>      <bounding>        <westbc>240.00</westbc>        <eastbc>300.00</eastbc>        <northbc>75.0</northbc>        <southbc>50.0</southbc>      </bounding>    </spdom>    <keywords>      <theme>        <themekt>NASA</themekt>        <themekey>Geologic Map</themekey>        <themekey>Venus</themekey>        <themekey>corona</themekey>        <themekey>ridge and fracture belt</themekey>        <themekey>impact crater</themekey>        <themekey>tessera</themekey>        <themekey>volcanic plains</themekey>        <themekey>Magellan data</themekey>      </theme>      <place>        <placekey>Venus</placekey>        <placekey>Metis Mons</placekey>        <placekey>Kawelu Planitia</placekey>        <placekey>Libuse Planitia</placekey>        <placekey>Guinevere Planitia</placekey>        <placekey>Bachue Corona</placekey>        <placekey>Feronia Corona</placekey>        <placekey>Otau Corona</placekey>        <placekey>Azham Corona</placekey>        <placekey>Coatlicue Corona</placekey>        <placekey>Rananeida Corona</placekey>        <placekey>Demeter Corona</placekey>        <placekey>Bau Corona</placekey>        <placekey>Bagbartu Mons</placekey>        <placekey>Mokosha Mons</placekey>        <placekey>Arita Mons</placekey>        <placekey>Ben Dorsa</placekey>        <placekey>Okipeta Dorsa</placekey>        <placekey>Varma-Ava Dorsa</placekey>        <placekey>Chykh-Keyok Dorsa</placekey>        <placekey>Hemera Dorsa</placekey>        <placekey>Iyele Dorsa</placekey>        <placekey>Ilbis Fossae</placekey>        <placekey>Minerva Fossae</placekey>        <placekey>Lampedo Linea</placekey>        <placekey>Atropos Tessera</placekey>        <placekey>Senectus Tessera</placekey>        <placekey>Virilis Tessera</placekey>        <placekey>Ale Tholus</placekey>        <placekey>Upunusa Tholus</placekey>        <placekey>Nerthus Tholus</placekey>        <placekey>Utrenitsa Vallis</placekey>      </place>      <place>        <placekt>Gazatteer of Planetary Nomenclature        (http://planetarynames.wr.usgs.gov)</placekt>      </place>    </keywords>    <accconst>None</accconst>    <useconst>None</useconst>    <ptcontac>      <cntinfo>        <cntorgp>          <cntorg>U.S. Geological Survey</cntorg>        </cntorgp>        <cntaddr>          <addrtype>mailing address</addrtype>          <address>2255 North Gemini Drive</address>          <city>Flagstaff</city>          <state>AZ</state>          <postal>86001</postal>          <country>United States of America</country>        </cntaddr>        <cntemail>ktanaka@usgs.gov</cntemail>      </cntinfo>    </ptcontac>    <datacred>U. S. Geological Survey. Prepared for the National    Aeronautics and Space Administration.</datacred>    <native>Microsoft Windows XP Version 5.1 (Build 2600) Service    Pack 3; ESRI ArcCatalog 9.3.1.1850</native>  </idinfo>  <dataqual>    <attracc>      <attraccr>All attributes created during the geologic mapping      process were verified by displaying lines in both the      database and the spatial coverage. Attributes are believed to      be logically consistent, commensurate with a scale of      1:5,000,000 scale using Magellan radar data.</attraccr>    </attracc>    <logic>These data are believed to be logically consistent,    commensurate with a scale of 1:5,000,000 scale using Magellan    radar data. Line geometry is topologically clean.</logic>    <posacc>      <horizpa>        <horizpar>The final map was generalized and scaled to be        commensurate with a 1:5,000,000 map scale, although map        component compilation was at a larger scale. Map scale and        base materials dictates that the locational accuracy of the        geologic linework is no better than 5 km. In places, due to        the nature of geologic mapping on radar basemaps, some        geologic features likely have positional errors        significantly greater than 5 kms. Overall, the geologic map        product is only as accurate as the original Magellan        basemap produced by the USGS. For more information        regarding original basemap accuracy see        http://www2.jpl.nasa.gov/magellan/.</horizpar>        <qhorizpa>          <horizpae>Pettengill, Gordon H.; Peter G. Ford, William          T. K. Johnson, R. Keith Raney,Laurence A. Soderblom          (1991). "Magellan: Radar Performance and Data Products".          Science (American Association for the Advacement of          Science) 252 (5003): 260-265.</horizpae>        </qhorizpa>      </horizpa>    </posacc>    <lineage>      <srcinfo>        <srccite>          <citeinfo>            <origin>U.S. Geological Survey</origin>            <title>Magellan F-Map mosaic</title>            <othercit>Pettengill, Gordon H.; Peter G. Ford, William            T. K. Johnson, R. Keith Raney,Laurence A. Soderblom            (1991). "Magellan: Radar Performance and Data            Products". Science (American Association for the            Advacement of Science) 252 (5003): 260-265.</othercit>            <onlink>http://www.jstor.org/stable/2875683</onlink>          </citeinfo>        </srccite>      </srcinfo>      <procstep>        <procdesc>Dohm identified preliminary map units by hand        using 1:1,000,000 scale hard-copy basemaps overlain by        Mylar. Mylar maps were digitized using a drum scanner and        merged in GIS. Skinner edited, cleaned, and (where        necessary) moved linework to the 1:5,000,000 scale digital        basemap in the project GIS. Dohm, Tanaka, and Skinner        iterated on the digitized linework by adding and deleting        contacts and units where necessary to best represent the        mapped geologic characteristics. Skinner finalized        completed features in GIS and prepared the map package for        external review by G. McGill and A. Brian. Skinner        implemented editorial comments and suggested changes by        reviewers.</procdesc>        <procdate>1998-2011</procdate>      </procstep>    </lineage>  </dataqual>  <spdoinfo>    <direct>Vector</direct>    <ptvctinf>      <sdtsterm>        <sdtstype>String</sdtstype>        <ptvctcnt>1759</ptvctcnt>      </sdtsterm>      <sdtsterm>        <sdtstype>G-polygon</sdtstype>        <ptvctcnt>629</ptvctcnt>      </sdtsterm>      <sdtsterm>        <sdtstype>String</sdtstype>        <ptvctcnt>5292</ptvctcnt>      </sdtsterm>      <sdtsterm>        <sdtstype>String</sdtstype>        <ptvctcnt>7767</ptvctcnt>      </sdtsterm>      <sdtsterm>        <sdtstype>Entity point</sdtstype>        <ptvctcnt>678</ptvctcnt>      </sdtsterm>      <sdtsterm>        <sdtstype>G-polygon</sdtstype>        <ptvctcnt>1</ptvctcnt>      </sdtsterm>      <sdtsterm>        <sdtstype>G-polygon</sdtstype>        <ptvctcnt>50</ptvctcnt>      </sdtsterm>      <sdtsterm>        <sdtstype>G-polygon</sdtstype>        <ptvctcnt>5</ptvctcnt>      </sdtsterm>      <sdtsterm>        <sdtstype>G-polygon</sdtstype>        <ptvctcnt>630</ptvctcnt>      </sdtsterm>    </ptvctinf>  </spdoinfo>  <spref>    <horizsys>      <planar>        <mapproj>          <mapprojn>Lambert Conformal Conic</mapprojn>          <lambertc>            <stdparll>34.000000</stdparll>            <stdparll>73.000000</stdparll>            <longcm>-90.000000</longcm>            <latprjo>0.000000</latprjo>            <feast>0.000000</feast>            <fnorth>0.000000</fnorth>          </lambertc>        </mapproj>        <planci>          <plance>coordinate pair</plance>          <coordrep>            <absres>0.000100</absres>            <ordres>0.000100</ordres>          </coordrep>          <plandu>meters</plandu>        </planci>      </planar>      <geodetic>        <horizdn><custom></horizdn>        <ellips><custom></ellips>        <semiaxis>6051000.000000</semiaxis>        <denflat>infinity</denflat>      </geodetic>    </horizsys>    <vertdef>      <altsys>        <altres>0.000100</altres>        <altenc>Explicit elevation coordinate included with        horizontal coordinates</altenc>      </altsys>    </vertdef>  </spref>  <eainfo>    <detailed>Final geologic contact polyline feature class. Contains a TYPE field denoting the type of geologic contact.Final geologic contact polyline feature class. Contains a TYPE field denoting the type of geologic contact.     <enttyp>      <enttypl>GeoContacts</enttypl>    </enttyp></detailed>    <detailed>Final geologic unit polygon feature class. Contains a Sph_Area field containing the area of each polygon, as calculated using the spheroid. Contains a UName field denoting the unit name. Contains a USym field denoting the unit symbol.     <enttyp>      <enttypl>GeoUnits</enttypl>    </enttyp></detailed>    <detailed>Final structural and morphologic polyline feature class. Contains a TYPE field denoting the type of linear feature.     <enttyp>      <enttypl>LinearFeatures</enttypl>    </enttyp></detailed>    <detailed>Final locational feature point feature class. Contains a TYPE field denoting the type of locational feature.     <enttyp>      <enttypl>LocationFeatures</enttypl>    </enttyp></detailed>    <detailed>Quadrangle boundary as polygon feature class.     <enttyp>      <enttypl>MapBoundary</enttypl>    </enttyp></detailed>    <detailed>Merged unit polygon feature class. Contains a UnitGroup field denoting the grouping as depicted in Figures 1A and 1B of the geologic map.     <enttyp>      <enttypl>UnitGroups_COMU</enttypl>    </enttyp></detailed>    <detailed>5 x 5 degree reference graticule as polyline feature class.     <enttyp>      <enttypl>Graticule</enttypl>    </enttyp></detailed>    <detailed>Annotation feature class showing the location and extent of approved planetary nomenclature for features located wholly or partly within the quadrangle boundary.     <enttyp>      <enttypl>Nomenclature</enttypl>    </enttyp></detailed>  </eainfo>  <distinfo>    <distrib>      <cntinfo>        <cntorgp>          <cntorg>U.S. Geological Survey</cntorg>        </cntorgp>        <cntaddr>          <addrtype>mailing address</addrtype>          <address>Box 25286 Federal Center</address>          <city>Denver</city>          <state>CO</state>          <postal>80225</postal>          <country>United States of America</country>        </cntaddr>        <cntinst>http://ww.usgs.gov/pubprod or 1-888-ASK-USGS        (1-888-275-8784)</cntinst>      </cntinfo>    </distrib>    <resdesc>Downloadable Data</resdesc>  </distinfo>  <metainfo>    <metd>20110412</metd>    <metc>      <cntinfo>        <cntorgp>          <cntorg>U.S. Geological Survey, Astrogeology Science          Center</cntorg>          <cntper>James A. Skinner, Jr.</cntper>        </cntorgp>        <cntpos>Geologist</cntpos>        <cntaddr>          <addrtype>mailing and physical address</addrtype>          <address>2255 North Gemini Drive</address>          <city>Flagstaff</city>          <state>AZ</state>          <postal>86001</postal>          <country>Unites States of America</country>        </cntaddr>        <cntvoice>928-556-7000</cntvoice>        <cntemail>jskinner@usgs.gov</cntemail>      </cntinfo>    </metc>    <metstdn>FGDC Content Standards for Digital Geospatial    Metadata</metstdn>    <metstdv>FGDC-STD-001-1998</metstdv>    <mettc>local time</mettc>    <metextns>      <onlink>http://www.esri.com/metadata/esriprof80.html</onlink>      <metprof>ESRI Metadata Profile</metprof>    </metextns>  </metainfo></metadata>