# National Land Cover Database 2001 Tree Canopy Layer: NLCD2001_CAN_Maryland

Metadata also available as

# Metadata:

- Identification_Information
- Data_Quality_Information
- Spatial_Data_Organization_Information
- Spatial_Reference_Information
- Entity_and_Attribute_Information
- Distribution_Information
- Metadata_Reference_Information

Identification_Information:
  Citation:
    Citation_Information:
      Originator: U.S. Geological Survey
      Publication_Date: 20030901
      Title:
        National Land Cover Database 2001 Tree Canopy Layer: NLCD2001_CAN_Maryland
      Edition: 1.0
      Geospatial_Data_Presentation_Form: remote-sensing image
      Series_Information:
        Series_Name: None
        Issue_Identification: None
      Publication_Information:
        Publication_Place: Sioux Falls, SD
        Publisher: U.S. Geological Survey
      Other_Citation_Details:
        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.
      Online_Linkage:
        <http://gisdata.usgs.gov/tdds/downloadfile.php?TYPE=nlcd2001_can_state&ORIG=META&FNAME=NLCD2001_CAN_Maryland.zip>
      Online_Linkage:
        <http://tdds.cr.usgs.gov/metadata/nlcd/2001/canopy/states/NLCD2001_CAN_Maryland.htm>
      Online_Linkage: <http://nationalmap.gov/viewer.html>
  Description:
    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.
    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.
    Supplemental_Information:
      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
  Time_Period_of_Content:
    Time_Period_Information:
      Range_of_Dates/Times:
        Beginning_Date: 19991013
        Ending_Date: 20020615
    Currentness_Reference: ground condition
  Status:
    Progress: Complete
    Maintenance_and_Update_Frequency: As needed
  Spatial_Domain:
    Bounding_Coordinates:
      West_Bounding_Coordinate: -75.8424570110167
      East_Bounding_Coordinate: -69.5260035402929
      North_Bounding_Coordinate: 54.5728844707497
      South_Bounding_Coordinate: 51.8528746012902
  Keywords:
    Theme:
      Theme_Keyword_Thesaurus: None
      Theme_Keyword: tree canopy
      Theme_Keyword: GIS
      Theme_Keyword: U.S. Geological Survey
      Theme_Keyword: USGS
      Theme_Keyword: digital spatial data
    Theme:
      Theme_Keyword_Thesaurus: ISO 19115 Topic Category
      Theme_Keyword: imagery
      Theme_Keyword: Base Maps
      Theme_Keyword: Earth Cover
      Theme_Keyword: imageryBaseMapsEarthCover
    Place:
      Place_Keyword_Thesaurus:
        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
      Place_Keyword: United States
      Place_Keyword: U.S.
      Place_Keyword: US
  Access_Constraints: None
  Use_Constraints: None
  Point_of_Contact:
    Contact_Information:
      Contact_Organization_Primary:
        Contact_Organization: U.S. Geological Survey
      Contact_Position: Customer Services Representative
      Contact_Address:
        Address_Type: mailing and physical
        Address: USGS/EROS
        Address: 47914 252nd Street
        City: Sioux Falls
        State_or_Province: SD
        Postal_Code: 57198-0001
        Country: USA
      Contact_Voice_Telephone: 605/594-6151
      Contact_Electronic_Mail_Address: tnm_help@usgs.gov
      Hours_of_Service: 0800 - 1600 CT, M - F (-6h CST/-5h CDT GMT)
      Contact_Instructions:
        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
  Browse_Graphic:
    Browse_Graphic_File_Name:
      <http://tdds.cr.usgs.gov/browse/nlcd/2001/canopy/states/NLCD2001_CAN_Maryland.jpg>
    Browse_Graphic_File_Description: Tiled NLCD Browse Image
    Browse_Graphic_File_Type: JPEG
  Data_Set_Credit: U.S. Geological Survey, MDA Federal, Inc.
  Security_Information:
    Security_Classification_System: None
    Security_Classification: Unclassified
    Security_Handling_Description: N/A
  Native_Data_Set_Environment:
    Microsoft Windows 2000 Version 5.1 (Build 2600) Service Pack 1; ESRI ArcCatalog 9.0.0.535

Data_Quality_Information:
  Attribute_Accuracy:
    Attribute_Accuracy_Report:
      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.
    Quantitative_Attribute_Accuracy_Assessment:
      Attribute_Accuracy_Value: Unknown
      Attribute_Accuracy_Explanation: Unknown
  Logical_Consistency_Report:
    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.
  Completeness_Report:
    This NLCD product of Tree Canopy layer is the version dated 07-15-2006.
  Positional_Accuracy:
    Horizontal_Positional_Accuracy:
      Horizontal_Positional_Accuracy_Report: N/A
    Vertical_Positional_Accuracy:
      Vertical_Positional_Accuracy_Report: N/A
  Lineage:
    Process_Step:
      Process_Description:
        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.
      Source_Used_Citation_Abbreviation: Landsat ETM, DOQQ, USGS/EROS
      Process_Date: Unknown
      Source_Produced_Citation_Abbreviation: USGS NLCD
      Process_Contact:
        Contact_Information:
          Contact_Organization_Primary:
            Contact_Organization: MDA Federal, Inc.
            Contact_Person: David.Cunningham
          Contact_Position: Vice President, Environmental/GIS Services
          Contact_Address:
            Address_Type: mailing
            Address: 6011 Executive Blvd., Suite 400
            City: Rockville
            State_or_Province: MD
            Postal_Code: 20852
            Country: USA
          Contact_Voice_Telephone: 240-833-8200
          Contact_TDD/TTY_Telephone: none
          Contact_Facsimile_Telephone: 240-833-8201
          Contact_Electronic_Mail_Address: David.Cunningham@MDAFederal.com
          Hours_of_Service: 8.00. a.m. - 5.00. P.M. ET M-F
    Process_Step:
      Process_Description:
        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).
      Source_Used_Citation_Abbreviation: Landsat ETM, DEM
      Process_Date: Unknown
      Source_Produced_Citation_Abbreviation: USGS NLCD
      Process_Contact:
        Contact_Information:
          Contact_Organization_Primary:
            Contact_Organization: U.S. Geological Survey
          Contact_Position: Customer Service Representative
          Contact_Address:
            Address_Type: mailing and physical
            Address: USGS/EROS
            Address: 47914 252nd Street
            City: Sioux Falls
            State_or_Province: SD
            Postal_Code: 57198-0001
            Country: USA
          Contact_Voice_Telephone: 605/594-6151
          Contact_Electronic_Mail_Address: tnm_help@usgs.gov
          Hours_of_Service: 0800 - 1600 CT, M - F (-6h CST/-5h CDT GMT)
          Contact_Instructions:
            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.

Spatial_Data_Organization_Information:
  Direct_Spatial_Reference_Method: Raster
  Raster_Object_Information:
    Raster_Object_Type: Pixel
    Row_Count: 6692
    Column_Count: 13362
    Vertical_Count: 1

Spatial_Reference_Information:
  Horizontal_Coordinate_System_Definition:
    Planar:
      Map_Projection:
        Map_Projection_Name: Albers Conical Equal Area
        Albers_Conical_Equal_Area:
          Standard_Parallel: 29.500000
          Standard_Parallel: 45.500000
          Longitude_of_Central_Meridian: -96.000000
          Latitude_of_Projection_Origin: 23.000000
          False_Easting: 0.000000
          False_Northing: 0.000000
      Planar_Coordinate_Information:
        Planar_Coordinate_Encoding_Method: row and column
        Coordinate_Representation:
          Abscissa_Resolution: 30.000000
          Ordinate_Resolution: 30.000000
        Planar_Distance_Units: meters
    Geodetic_Model:
      Horizontal_Datum_Name: North American Datum of 1983
      Ellipsoid_Name: Geodetic Reference System 80
      Semi-major_Axis: 6378137.0
      Denominator_of_Flattening_Ratio: 298.2572221

Entity_and_Attribute_Information:
  Detailed_Description:
    Entity_Type:
      Entity_Type_Label: Layer_1
      Entity_Type_Definition: NLDC Canopy Layer
      Entity_Type_Definition_Source: National Land Cover Database 2001
    Attribute:
      Attribute_Label: ObjectID
      Attribute_Definition: Internal feature number
      Attribute_Definition_Source: ESRI
      Attribute_Domain_Values:
        Unrepresentable_Domain:
          Sequential unique whole numbers that are automatically generated.
    Attribute:
      Attribute_Label: Value
      Attribute_Definition: Percent Canopy
      Attribute_Definition_Source: NLCD 2001
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: 0
          Range_Domain_Maximum: 1
          Attribute_Units_of_Measure: percentage
          Attribute_Measurement_Resolution: 0.1
    Attribute:
      Attribute_Label: Count
      Attribute_Definition:
        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
      Attribute_Definition_Source: NLCD 2001
      Attribute_Domain_Values:
        Unrepresentable_Domain: Integer
    Attribute:
      Attribute_Label: Red
      Attribute_Definition:
        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.
      Attribute_Definition_Source: NLCD 2001
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: 0
          Range_Domain_Maximum: 100
          Attribute_Units_of_Measure: CSS Color Value Percentage
          Attribute_Measurement_Resolution: 0.1
    Attribute:
      Attribute_Label: Green
      Attribute_Definition:
        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.
      Attribute_Definition_Source: NLCD 2001
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: 0
          Range_Domain_Maximum: 100
          Attribute_Units_of_Measure: CSS Color Value Percentage
          Attribute_Measurement_Resolution: 0.1
    Attribute:
      Attribute_Label: Blue
      Attribute_Definition:
        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.
      Attribute_Definition_Source: NLCD 2001
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: 0
          Range_Domain_Maximum: 100
          Attribute_Units_of_Measure: CSS Color Value Percentage
          Attribute_Measurement_Resolution: 0.1
    Attribute:
      Attribute_Label: Opacity
      Attribute_Definition:
        A measure of how opaque, or solid, a color is displayed in a layer.
      Attribute_Definition_Source: NLCD 2001
      Attribute_Domain_Values:
        Range_Domain:
          Range_Domain_Minimum: 0
          Range_Domain_Maximum: 100
          Attribute_Units_of_Measure: Percentage
          Attribute_Measurement_Resolution: 0.1
  Overview_Description:
    Entity_and_Attribute_Overview: Attributes defined by USGS and ESRI.
    Entity_and_Attribute_Detail_Citation:
      Attribute accuracy is described, where present, with each attribute defined in the Entity and Attribute Section.

Distribution_Information:
  Distributor:
    Contact_Information:
      Contact_Organization_Primary:
        Contact_Organization: U.S. Geological Survey
      Contact_Position: Customer Service Representative
      Contact_Address:
        Address_Type: mailing and physical
        Address: USGS/EROS
        Address: 47914 252nd Street
        City: Sioux Falls
        State_or_Province: SD
        Postal_Code: 57198-0001
        Country: USA
      Contact_Voice_Telephone: 605/594-6151
      Contact_Electronic_Mail_Address: tnm_help@usgs.gov
      Hours_of_Service: 0800 - 1600 CT, M - F (-6h CST/-5h CDT GMT)
      Contact_Instructions:
        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.
  Resource_Description: Downloadable data
  Distribution_Liability:
    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.
  Standard_Order_Process:
    Digital_Form:
      Digital_Transfer_Information:
        Format_Name: GeoTIFF
        Transfer_Size: 12.430674
      Digital_Transfer_Option:
        Online_Option:
          Computer_Contact_Information:
            Network_Address:
              Network_Resource_Name:
                <http://gisdata.usgs.gov/tdds/downloadfile.php?TYPE=nlcd2001_can_state&ORIG=META&FNAME=NLCD2001_CAN_Maryland.zip>
          Access_Instructions:
            The URL <http://nationalmap.gov/viewer.html> provides a map interface that allows for data downloads within a customer defined area of interest.
          Online_Computer_and_Operating_System: Not available for dissemination
    Fees: None
    Ordering_Instructions: Contact Customer Services
    Turnaround: Variable
  Custom_Order_Process: Contact Customer Services Representative
  Technical_Prerequisites:
    ESRI ArcMap Suite and/or Arc/Info software, and supporting operating systems.

Metadata_Reference_Information:
  Metadata_Date: 20060804
  Metadata_Contact:
    Contact_Information:
      Contact_Organization_Primary:
        Contact_Organization: U.S. Geological Survey
      Contact_Position: Customer Services Representative
      Contact_Address:
        Address_Type: mailing and physical
        Address: USGS/EROS
        Address: 47914 252nd Street
        City: Sioux Falls
        State_or_Province: SD
        Postal_Code: 57198-0001
        Country: USA
      Contact_Voice_Telephone: 605/594-6151
      Contact_Electronic_Mail_Address: tnm_help@usgs.gov
      Hours_of_Service: 0800 - 1600 CT, M - F (-6h CST/-5h CDT GMT)
  Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata
  Metadata_Standard_Version: FGDC-STD-001-1998
  Metadata_Time_Convention: local time
  Metadata_Access_Constraints: None
  Metadata_Use_Constraints: None
  Metadata_Security_Information:
    Metadata_Security_Classification_System: None
    Metadata_Security_Classification: None
    Metadata_Security_Handling_Description: None

Generated by `mp` version 2.9.12 on Tue Jun 17 14:35:25 2014