<metadata>
  <idinfo>
    <citation>
      <citeinfo>
        <origin>U.S. Geological Survey</origin>
        <pubdate>20030901</pubdate>
        <title>National Land Cover Database 2001 Tree Canopy Layer: NLCD2001_CAN_Massachusetts</title>
        <edition>1.0</edition>
        <geoform>remote-sensing image</geoform>
        <serinfo>
          <sername>None</sername>
          <issue>None</issue>
        </serinfo>
        <pubinfo>
          <pubplace>Sioux Falls, SD</pubplace>
          <publish>U.S. Geological Survey</publish>
        </pubinfo>
        <othercit>References: Homer, C., C. Huang, L. Yang, B. Wylie and M. Coan, 2004.  Development of a 2001 national land cover database for the United States.  Photogrammetric Engineering and Remote Sensing.Huang, C., L. Yang, B. Wylie, and C. Homer, 2001. A strategy for estimating tree canopy density using Landsat 7 ETM+ and high resolution images over large areas. In: Third International Conference on Geospatial Information in Agriculture and Forestry; November 5-7, 2001; Denver, Colorado. CD-ROM, 1 disk.The USGS acknowledges the support of MDA Fedreal Inc. in development of data in this zone.</othercit>
        <onlink>http://gisdata.usgs.gov/tdds/downloadfile.php?TYPE=nlcd2001_can_state&amp;ORIG=META&amp;FNAME=NLCD2001_CAN_Massachusetts.zip</onlink>
        <onlink>http://tdds.cr.usgs.gov/metadata/nlcd/2001/canopy/states/NLCD2001_CAN_Massachusetts.htm</onlink>
        <onlink>http://nationalmap.gov/viewer.html</onlink>
      </citeinfo>
    </citation>
    <descript>
      <abstract>The National Land Cover Database 2001 tree canopy layer was produced through a cooperative project conducted by the Multi-Resolution Land Characteristics (MRLC) Consortium.  The MRLC Consortium is a partnership of federal agencies (www.mrlc.gov), consisting of the U.S. Geological Survey (USGS), the National Oceanic and Atmospheric Administration (NOAA), the U.S. Environmental Protection Agency (EPA), the U.S. Department of Agriculture (USDA), the U.S. Forest Service (USFS), the National Park Service (NPS), the U.S. Fish and Wildlife Service (FWS), the Bureau of Land Management (BLM) and the USDA Natural Resources Conservation Service (NRCS).  One of the primary goals of the project is to generate a current, consistent, seamless, and accurate National Land cover Database (NLCD) circa 2001 for the United States at medium spatial resolution.  For a detailed definition and discussion on MRLC and the NLCD 2001 products, refer to Homer et al. (2003) and http://www.mrlc.gov/mrlc2k.asp.The NLCD 2001 was created by partitioning the U.S. into mapping zones.  A total of 66 mapping zones were delineated within the conterminous U.S. based on ecoregion and geographical characteristics, edge matching features and the size requirement of Landsat mosaics.</abstract>
      <purpose>The goal of this project is to provide the Nation with complete, current and consistent public domain information on its land use and land cover.</purpose>
      <supplinf>Corner Coordinates (center of pixel, projection meters) Upper Left Corner: -346080 meters(X), 1578450 meters(Y)Lower Right Corner: 109590 meters(X), 892290 meters(Y) Spatial-specific information not available</supplinf>
    </descript>
    <timeperd>
      <timeinfo>
        <rngdates>
          <begdate>19991013</begdate>
          <enddate>20020615</enddate>
        </rngdates>
      </timeinfo>
      <current>ground condition</current>
    </timeperd>
    <status>
      <progress>Complete</progress>
      <update>As needed</update>
    </status>
    <spdom>
      <bounding>
        <westbc>-67.9414869146034</westbc>
        <eastbc>-62.6750115481771</eastbc>
        <northbc>57.5584080086859</northbc>
        <southbc>55.0402873890662</southbc>
      </bounding>
    </spdom>
    <keywords>
      <theme>
        <themekt>None</themekt>
        <themekey>tree canopy</themekey>
        <themekey>GIS</themekey>
        <themekey>U.S. Geological Survey</themekey>
        <themekey>USGS</themekey>
        <themekey>digital spatial data</themekey>
      </theme>
      <theme>
        <themekt>ISO 19115 Topic Category</themekt>
        <themekey>imagery</themekey>
        <themekey>Base Maps</themekey>
        <themekey>Earth Cover</themekey>
        <themekey>imageryBaseMapsEarthCover</themekey>
      </theme>
      <place>
        <placekt>U.S. Department of Commerce, 1995, Countries, dependencies, areas of special sovereignty, and their principal administrative divisions, Federal Information Processing Standard 10-4,): Washington, D.C., National Institute of Standards and Technology</placekt>
        <placekey>United States</placekey>
        <placekey>U.S.</placekey>
        <placekey>US</placekey>
      </place>
    </keywords>
    <accconst>None</accconst>
    <useconst>None</useconst>
    <ptcontac>
      <cntinfo>
        <cntorgp>
          <cntorg>U.S. Geological Survey</cntorg>
        </cntorgp>
        <cntpos>Customer Services Representative</cntpos>
        <cntaddr>
          <addrtype>mailing and physical</addrtype>
          <address>USGS/EROS</address>
          <address>47914 252nd Street</address>
          <city>Sioux Falls</city>
          <state>SD</state>
          <postal>57198-0001</postal>
          <country>USA</country>
        </cntaddr>
        <cntvoice>605/594-6151</cntvoice>
        <cntemail>tnm_help@usgs.gov</cntemail>
        <hours>0800 - 1600 CT, M - F (-6h CST/-5h CDT GMT)</hours>
        <cntinst>The USGS point of contact is for questions relating to the data display and download from this web site.  For questions regarding data content and quality, refer to:http://www.mrlc.gov/mrlc2k.asp or email:  mrlc@usgs.gov</cntinst>
      </cntinfo>
    </ptcontac>
    <browse>
      <browsen>http://tdds.cr.usgs.gov/browse/nlcd/2001/canopy/states/NLCD2001_CAN_Massachusetts.jpg</browsen>
      <browsed>Tiled NLCD Browse Image</browsed>
      <browset>JPEG</browset>
    </browse>
    <datacred>U.S. Geological Survey, MDA Federal, Inc.</datacred>
    <secinfo>
      <secsys>None</secsys>
      <secclass>Unclassified</secclass>
      <sechandl>N/A</sechandl>
    </secinfo>
    <native>Microsoft Windows 2000 Version 5.1 (Build 2600) Service Pack 1; ESRI ArcCatalog 9.0.0.535</native>
  </idinfo>
  <dataqual>
    <attracc>
      <attraccr>Regression tree algorithms employed in NLCD 2001 mapping offer a cross-validation option for assessing classification and prediction reliability.  Cross-validation can provide relatively reliable estimates for tree canopy predictions if the reference data used for cross-validation are collected based on a statistically valid sampling design.  Users should be cautioned that these cross-validation results provide users with only first-order estimates of data quality, and should not be considered a formal accuracy assessment.</attraccr>
      <qattracc>
        <attraccv>Unknown</attraccv>
        <attracce>Unknown</attracce>
      </qattracc>
    </attracc>
    <logic>1-m resolution DOQQs were classified into either tree canopy or non-tree canopy areas, and then values summed within each 30 meter Landsat pixel cell to obtain the percentage of tree canopy.</logic>
    <complete>This NLCD product of Tree Canopy layer is the version dated 07-15-2006.</complete>
    <posacc>
      <horizpa>
        <horizpar>N/A</horizpar>
      </horizpa>
      <vertacc>
        <vertaccr>N/A</vertaccr>
      </vertacc>
    </posacc>
    <lineage>
      <procstep>
        <procdesc>The method employed to map tree canopy density for NLCD 2001 consists of three key steps: deriving reference data of tree canopy density from the high spatial resolution images, calibrating density prediction models using reference data and Landsat spectral bands, and extrapolating the developed models spatially to map per-pixel tree canopy density.  This method is described in detail in Huang et al. (2001).  This approach was applied to all mapping zones by MDA Federal, Inc.</procdesc>
        <srcused>Landsat ETM, DOQQ, USGS/EROS</srcused>
        <procdate>Unknown</procdate>
        <srcprod>USGS NLCD</srcprod>
        <proccont>
          <cntinfo>
            <cntorgp>
              <cntorg>MDA Federal, Inc.</cntorg>
              <cntper>David.Cunningham</cntper>
            </cntorgp>
            <cntpos>Vice President, Environmental/GIS Services</cntpos>
            <cntaddr>
              <addrtype>mailing</addrtype>
              <address>6011 Executive Blvd., Suite 400</address>
              <city>Rockville</city>
              <state>MD</state>
              <postal>20852</postal>
              <country>USA</country>
            </cntaddr>
            <cntvoice>240-833-8200</cntvoice>
            <cnttdd>none</cnttdd>
            <cntfax>240-833-8201</cntfax>
            <cntemail>David.Cunningham@MDAFederal.com</cntemail>
            <hours>8.00. a.m. - 5.00. P.M. ET M-F</hours>
          </cntinfo>
        </proccont>
      </procstep>
      <procstep>
        <procdesc>To develop adequate training data for tree canopy density estimation, 8 1-m resolution DOQQs across mapping zone 32 were classified into either tree canopy or non-tree canopy areas, and then values summed within each 30 meter Landsat pixel cell to obtain the percentage of tree canopy.   The training data were selected based on the degree of variance each training data set possesses with regards to Landsat ETM+ imagery used for mapping.  Each added training data set decreased the amount of variance present within the Landsat data as a whole.  The process was repeated until the required number of samples (11) had been allocated.By combining the training data with Landsat spectral data and other ancillary data, tree canopy prediction models were developed using "Cubist".   After the best combination of possible input data layers had been determined and the final percent canopy density layer produced, a mask was made from the final land cover classification of the mapping zone and was used to eliminate those pixels from the canopy density file that fall into non-forested areas.  The mask includes 5 land cover classes (deciduous forest, coniferous forest, mixed forest, woody wetlands, and developed open space).</procdesc>
        <srcused>Landsat ETM, DEM</srcused>
        <procdate>Unknown</procdate>
        <srcprod>USGS NLCD</srcprod>
        <proccont>
          <cntinfo>
            <cntorgp>
              <cntorg>U.S. Geological Survey</cntorg>
            </cntorgp>
            <cntpos>Customer Service Representative</cntpos>
            <cntaddr>
              <addrtype>mailing and physical</addrtype>
              <address>USGS/EROS</address>
              <address>47914 252nd Street</address>
              <city>Sioux Falls</city>
              <state>SD</state>
              <postal>57198-0001</postal>
              <country>USA</country>
            </cntaddr>
            <cntvoice>605/594-6151</cntvoice>
            <cntemail>tnm_help@usgs.gov</cntemail>
            <hours>0800 - 1600 CT, M - F (-6h CST/-5h CDT GMT)</hours>
            <cntinst>The USGS point of contact is for questions relating to the data display and download from this web site.  Questions about NLCD products can be directed to the NLCD 2001 land cover mapping team at the USGS/EROS, Sioux Falls, SD (605) 594-6151 or mrlc@usgs.gov.</cntinst>
          </cntinfo>
        </proccont>
      </procstep>
    </lineage>
  </dataqual>
  <spdoinfo>
    <direct>Raster</direct>
    <rastinfo>
      <rasttype>Pixel</rasttype>
      <rowcount>5848</rowcount>
      <colcount>10232</colcount>
      <vrtcount>1</vrtcount>
    </rastinfo>
  </spdoinfo>
  <spref>
    <horizsys>
      <planar>
        <mapproj>
          <mapprojn>Albers Conical Equal Area</mapprojn>
          <albers>
            <stdparll>29.500000</stdparll>
            <stdparll>45.500000</stdparll>
            <longcm>-96.000000</longcm>
            <latprjo>23.000000</latprjo>
            <feast>0.000000</feast>
            <fnorth>0.000000</fnorth>
          </albers>
        </mapproj>
        <planci>
          <plance>row and column</plance>
          <coordrep>
            <absres>30.000000</absres>
            <ordres>30.000000</ordres>
          </coordrep>
          <plandu>meters</plandu>
        </planci>
      </planar>
      <geodetic>
        <horizdn>North American Datum of 1983</horizdn>
        <ellips>Geodetic Reference System 80</ellips>
        <semiaxis>6378137.0</semiaxis>
        <denflat>298.2572221</denflat>
      </geodetic>
    </horizsys>
  </spref>
  <eainfo>
    <detailed>
      <enttyp>
        <enttypl>Layer_1</enttypl>
        <enttypd>NLDC Canopy Layer</enttypd>
        <enttypds>National Land Cover Database 2001</enttypds>
      </enttyp>
      <attr>
        <attrlabl>ObjectID</attrlabl>
        <attrdef>Internal feature number</attrdef>
        <attrdefs>ESRI</attrdefs>
        <attrdomv>
          <udom>Sequential unique whole numbers that are automatically generated.</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>Value</attrlabl>
        <attrdef>Percent Canopy</attrdef>
        <attrdefs>NLCD 2001</attrdefs>
        <attrdomv>
          <rdom>
            <rdommin>0</rdommin>
            <rdommax>1</rdommax>
            <attrunit>percentage</attrunit>
            <attrmres>0.1</attrmres>
          </rdom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>Count</attrlabl>
        <attrdef>A nominal integer value that designates the number of pixels that have each value in the file; histogram column in ERDAS Imagine raster attributes table</attrdef>
        <attrdefs>NLCD 2001</attrdefs>
        <attrdomv>
          <udom>Integer</udom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>Red</attrlabl>
        <attrdef>Red color code for RGB slice by value for canopy image display purposes.  The value is arbitrarily assigned by the display software package, unless defined by user.  Standard user defined ramp for NLCD project is start color light gray, end color red.</attrdef>
        <attrdefs>NLCD 2001</attrdefs>
        <attrdomv>
          <rdom>
            <rdommin>0</rdommin>
            <rdommax>100</rdommax>
            <attrunit>CSS Color Value Percentage</attrunit>
            <attrmres>0.1</attrmres>
          </rdom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>Green</attrlabl>
        <attrdef>Green color code for RGB slice by value for canopy image display purposes.  The value is arbitrarily assigned by the display software package, unless defined by user.  Standard user defined ramp for NLCD project is start color light gray, end color red.</attrdef>
        <attrdefs>NLCD 2001</attrdefs>
        <attrdomv>
          <rdom>
            <rdommin>0</rdommin>
            <rdommax>100</rdommax>
            <attrunit>CSS Color Value Percentage</attrunit>
            <attrmres>0.1</attrmres>
          </rdom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>Blue</attrlabl>
        <attrdef>Blue color code for RGB slice by value for canopy image display purposes.  The value is arbitrarily assigned by the display software package, unless defined by user.  Standard user defined ramp for NLCD project is start color light gray, end color red.</attrdef>
        <attrdefs>NLCD 2001</attrdefs>
        <attrdomv>
          <rdom>
            <rdommin>0</rdommin>
            <rdommax>100</rdommax>
            <attrunit>CSS Color Value Percentage</attrunit>
            <attrmres>0.1</attrmres>
          </rdom>
        </attrdomv>
      </attr>
      <attr>
        <attrlabl>Opacity</attrlabl>
        <attrdef>A measure of how opaque, or solid, a color is displayed in a layer.</attrdef>
        <attrdefs>NLCD 2001</attrdefs>
        <attrdomv>
          <rdom>
            <rdommin>0</rdommin>
            <rdommax>100</rdommax>
            <attrunit>Percentage</attrunit>
            <attrmres>0.1</attrmres>
          </rdom>
        </attrdomv>
      </attr>
    </detailed>
    <overview>
      <eaover>Attributes defined by USGS and ESRI.</eaover>
      <eadetcit>Attribute accuracy is described, where present, with each attribute defined in the Entity and Attribute Section.</eadetcit>
    </overview>
  </eainfo>
  <distinfo>
    <distrib>
      <cntinfo>
        <cntorgp>
          <cntorg>U.S. Geological Survey</cntorg>
        </cntorgp>
        <cntpos>Customer Service Representative</cntpos>
        <cntaddr>
          <addrtype>mailing and physical</addrtype>
          <address>USGS/EROS</address>
          <address>47914 252nd Street</address>
          <city>Sioux Falls</city>
          <state>SD</state>
          <postal>57198-0001</postal>
          <country>USA</country>
        </cntaddr>
        <cntvoice>605/594-6151</cntvoice>
        <cntemail>tnm_help@usgs.gov</cntemail>
        <hours>0800 - 1600 CT, M - F (-6h CST/-5h CDT GMT)</hours>
        <cntinst>The USGS point of contact is for questions relating to the data display and download from this web site.  Questions about the NLCD products can be directed to the NLCD 2001 land cover mapping team at the USGS/EROS, Sioux Falls, SD (605) 594-6151 or mrlc@usgs.gov.</cntinst>
      </cntinfo>
    </distrib>
    <resdesc>Downloadable data</resdesc>
    <distliab>Although these data have been processed successfully on a computer system at the USGS, no warranty expressed or implied is made by the USGS regarding the use of the data on any other system, nor does the act of distribution constitute any such warranty.  Data may have been compiled from various outside sources.  Spatial information may not meet National Map Accuracy Standards.  This information may be updated without notification. The USGS shall not be liable for any activity involving these data, installation, fitness of the data for a particular purpose, its use, or analyses results.</distliab>
    <stdorder>
      <digform>
        <digtinfo>
          <formname>GeoTIFF</formname>
          <transize>12.274769</transize>
        </digtinfo>
        <digtopt>
          <onlinopt>
            <computer>
              <networka>
                <networkr>http://gisdata.usgs.gov/tdds/downloadfile.php?TYPE=nlcd2001_can_state&amp;ORIG=META&amp;FNAME=NLCD2001_CAN_Massachusetts.zip</networkr>
              </networka>
            </computer>
            <accinstr>The URL http://nationalmap.gov/viewer.html provides a map interface that allows for data downloads within a customer defined area of interest.</accinstr>
            <oncomp>Not available for dissemination</oncomp>
          </onlinopt>
        </digtopt>
      </digform>
      <fees>None</fees>
      <ordering>Contact Customer Services</ordering>
      <turnarnd>Variable</turnarnd>
    </stdorder>
    <custom>Contact Customer Services Representative</custom>
    <techpreq>ESRI ArcMap Suite and/or Arc/Info software, and supporting operating systems.</techpreq>
  </distinfo>
  <metainfo>
    <metd>20060804</metd>
    <metc>
      <cntinfo>
        <cntorgp>
          <cntorg>U.S. Geological Survey</cntorg>
        </cntorgp>
        <cntpos>Customer Services Representative</cntpos>
        <cntaddr>
          <addrtype>mailing and physical</addrtype>
          <address>USGS/EROS</address>
          <address>47914 252nd Street</address>
          <city>Sioux Falls</city>
          <state>SD</state>
          <postal>57198-0001</postal>
          <country>USA</country>
        </cntaddr>
        <cntvoice>605/594-6151</cntvoice>
        <cntemail>tnm_help@usgs.gov</cntemail>
        <hours>0800 - 1600 CT, M - F (-6h CST/-5h CDT GMT)</hours>
      </cntinfo>
    </metc>
    <metstdn>FGDC Content Standard for Digital Geospatial Metadata</metstdn>
    <metstdv>FGDC-STD-001-1998</metstdv>
    <mettc>local time</mettc>
    <metac>None</metac>
    <metuc>None</metuc>
    <metsi>
      <metscs>None</metscs>
      <metsc>None</metsc>
      <metshd>None</metshd>
    </metsi>
  </metainfo>
</metadata>