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NLCD_2001_Imperviousness.lyr

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: NLCD_2001_Imperviousness.lyr

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: Yang, L, C. Huang, C. Homer, B. Wylie, and M. Coan, 2002. An approach for mapping large-area impervious surfaces: Synergistic use of Landsat 7 ETM+ and high spatial resolution imagery. Canadian Journal of Remote Sensing, 29: 2, 230-240.

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.

The USGS acknowledges the support of Space Imaging LLC in development of data in this zone.

Online_Linkage: \\DEP-EIA1TSGIS01\images\landcover\nlcd_2001_imperviousness.img

Description:

Abstract:

The National Land Cover Database 2001 for mapping zone 66 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, edgematching features and the size requirement of Landsat mosaics. Mapping zone 66 encompasses whole or portions of several states including Maine, New Hampshire and Vermont. Questions about the NLCD mapping zone 66 can be directed to the NLCD 2001 land cover mapping team at the USGS EROS Data Center (EDC), Sioux Falls, SD (605) 594-6151 or mrlc@usgs.gov.

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: 1756725 meters(X), 3015555 meters(Y) Lower Right Corner: 2266455 meters(X), 2477535 meters(Y)

Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date:

REQUIRED: The year (and optionally month, or month and day) for which the data set corresponds to the ground.

Range_of_Dates/Times:

Currentness_Reference: ground condition

Status:

Progress: Complete

Maintenance_and_Update_Frequency: As needed

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -73.996979

East_Bounding_Coordinate: -65.893981

North_Bounding_Coordinate: 48.160445

South_Bounding_Coordinate: 42.264279

Keywords:

Theme:

Theme_Keyword_Thesaurus: None

Theme_Keyword: Imperviousness

Theme_Keyword: GIS

Theme_Keyword: U.S. Geological Survey

Theme_Keyword: USGS

Theme_Keyword: digital spatial data

Theme:

Theme_Keyword_Thesaurus: ISO 19115 Category

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

Place:

Place_Keyword_Thesaurus: None

Place_Keyword: Zone 66

Place:

Place_Keyword_Thesaurus:

U.S. Department of Commerce, 1987, Codes for the identification of the States, the District of Columbia and the outlying areas of the United States, and associated areas (Federal Information Processing Standard 5-2): Washington, D.C., National Institute of Standards and Technology

Place_Keyword: ME

Place_Keyword: Maine

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

Address: USGS EROS Data Center

Address: 47914 252nd Street

City: Sioux Falls

State_or_Province: SD

Postal_Code: 57198-0001

Country: USA

Contact_Voice_Telephone: 605/594-6151

Contact_TDD/TTY_Telephone: 605/594-6933

Contact_Facsimile_Telephone: 605/594-6589

Contact_Electronic_Mail_Address: custserv@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

Data_Set_Credit: U.S. Geological Survey, Space Imaging LLC

Security_Information:

Security_Classification_System: None

Security_Classification: Unclassified

Security_Handling_Description: N/A

Native_Data_Set_Environment:

Microsoft Windows 2000 Version 5.2 (Build 3790) Service Pack 1; ESRI ArcCatalog 9.0.0.535

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report:

The information on data quality for mapping zone 66 was generated by the Regression Tree algorithm that conducts a cross-validation for assessing classification and prediction reliability. No formal independent accuracy assessment of mapping zone 66 imperviousness has been made. The regression tree algorithm employed in NLCD 2001 mapping offers a cross-validation option for assessing classification and prediction reliability. Cross-validation can provide relatively reliable estimates for imperviousness predictions if the reference data used for cross-validation are collected based on a statistical valid sampling design. For mapping zone 66 imperviousness modeling, a 5-fold cross-validation was conducted by dividing the entire training data set into 5 subsets of equal size. For each model run, an accuracy estimate was derived using one subset to evaluate the model prediction (with the model developed using the remaining training samples). This process was repeated 5 times. After all 5 runs, an average value of all accuracy estimates from the 5 runs were computed. 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: 88%

Attribute_Accuracy_Explanation:

The above listed value is the overall accuracy obtained for imperviousness data in the cross-validation study for mapping zone 66.

Logical_Consistency_Report:

The method employed to map percent imperviousness for NLCD 2001 mapping zone 66 consists of three key steps: deriving reference data of imperviousness 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 imperviousness.

Completeness_Report:

This NLCD product of mapping zone 66 Imperviousness layer is the version 1 dated 09-01-2003.

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 percent imperviousness for NLCD 2001 mapping zone 66 consists of three key steps: deriving reference data of imperviousness 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 imperviousness. This method is described in detail in Yang et al. (2003). This method was applied to mapping zone 66 by Space Imaging LLC.

Process_Date: Unknown

Process_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization:

Contact_Position:

Contact_Address:

Address_Type:

Address:

City:

State_or_Province:

Postal_Code:

Country:

Contact_Voice_Telephone:

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Hours_of_Service:

Process_Step:

Process_Description:

To develop adequate training data for impervious estimation, 20 IKONOS scenes across the mapping zone with a nominal spatial resolution of 1-m were classified into either pervious or non-pervious surfaces, and then summed within each 30 meter Landsat pixel cell to obtain percentage of imperviousness. 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 selection process was repeated until the amount of variance explained reached a pre-defined threshold.

By combining the training data with Landsat spectral data and other ancillary data, percent imperviousness prediction models were developed using a regression tree algorithm (named "Cubist"). All data layers used as input for running the Cubist in order to establish the prediction model for imperviousness are listed in the "Supplemental Information" section. Three ancillary data sets were used for urban/suburban delineation masking, which is essential to confine the imperviousness mapping within the developed areas.

After the best combination of possible input data layers had been determined and the final percent impervious layer produced, the urban mask created was used to eliminate those pixels from the final percent impervious file that fall outside identified impervious surface areas. Thus, the impervious pixels identified within the mask were retained, while all non-impervious surface pixels were removed from the final product. This corrected for any small areas of pixels that may have been included as part of the impervious surface layer because their spectral signature was not covered in the Cubist modeling process. Finally, visual inspection of imperviousness layer was made with limited manual editing to eliminate non-urban areas based on area of interest delineated by the mapping team.

Acquisition dates of Landsat ETM+ (TM) scenes used for land cover classification in zone 66 are as follows: SPRING-

Index Path/Row Date Scene ID 1 10/29 05/17/2003 7010029000313750 2 11/27 05/16/2003(L5) 5011027000313610 2 11/28 05/16/2003(L5) 5011028000313610 3 11/29 04/14/2003 7011029000012050 10 11/30 05/10/2001(L5) 5011030000310410 6 12/27 05/12/2002 7012027000213250 8 12/28 05/25/2001 7012028000114550 7 12/29 05/04/2002(L5) 5012029000212410 9 12/30 05/09/2001 7012030000112950 4 13/29 05/08/2001(L5) 5013029000112810 4 13/30 05/08/2001(L5) 5013030000112810 5 14/29 05/07/2001 7014029000112750

LEAF ON (Summer) - 1 10 29 L7 06/28/2001 7010029000117950 2 11 27 L7 08/09/2002 7011027000222150 (Part masks clouds) 2 11 28 L7 08/09/2002 7011028000222150 (Part masks clouds) 2 11 29 L7 08/09/2002 7011029000222150 (Clipped) 2 11 30 L7 08/09/2002 7011030000222150 3 12 27 L5 07/20/2001 5012027000120110 (Clipped) 3 12 28 L5 07/20/2001 5012028000120110 4 12 29 L7 05/25/2001 7012029000114550 5 12 30 L5 06/21/2002 5012030000217210 6 13 29 L7 06/04/2002 7013029000215550 (Clipped) 7 13 30 L7 08/31/1999 7013030009924350 (Clipped) 8 14 29 L7 06/08/2001 7014029000115950 9 Various Area 1 Cloud Replacement Derived Image 10 Various Area 2 Cloud Replacement Derived Image 11 Various Area 3 Cloud Replacement Derived Image

LEAF-OFF (Fall) - 9 10/29 10/02/2001 7010029000127550 3 11/27 10/04/2002(L5) 5011027000227710 4 11/28 10/01/2001(L5) 5011028000127410 5 11/29 10/22/2000 7011029000029650 1 12/27 09/30/2001 7012027000127351 1 12/28 09/30/2001 7012028000127351 2 12/29 10/16/2001 7012029000128950 2 12/30 10/16/2001 7012030000128950 7 13/29 10/12/2000(L5) 5013029000028610 8 13/30 11/08/2001 7013030000029450 6 14/29 10/12/2003(L5) 5014029000328510 10 11/29 cloud patch

Landsat data and ancillary data used for the imperviousness prediction -

Data Type of DEM composed of 1 band and a Continuous Variable Type.

Data Type of Slope composed of 1 band and a Continuous Variable Type.

Data Type of Aspect composed of 1 band of Categorical Variable Type.

Process_Step:

Process_Description: Metadata imported.

Source_Used_Citation_Abbreviation: f:\temp\xml1D6.tmp

Process_Step:

Process_Description: Metadata imported.

Source_Used_Citation_Abbreviation: C:\DOCUME~1\MICHAE~1.SMI\LOCALS~1\Temp\xmlA3.tmp

Process_Step:

Process_Description: Metadata imported.

Source_Used_Citation_Abbreviation: C:\DOCUME~1\sde\LOCALS~1\Temp\3\xml9.tmp

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Raster

Raster_Object_Information:

Raster_Object_Type: Pixel

Row_Count: 17934

Column_Count: 16991

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: 6378137.000000

Denominator_of_Flattening_Ratio: 298.257222

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: Layer_1

Attribute:

Attribute_Label: ObjectID

Attribute_Definition: Internal feature number.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Range_Domain:

Unrepresentable_Domain:

Sequential unique whole numbers that are automatically generated.

Attribute:

Attribute_Label: Value

Attribute:

Attribute_Label: Count

Attribute:

Attribute_Label: Red

Attribute:

Attribute_Label: Green

Attribute:

Attribute_Label: Blue

Attribute:

Attribute_Label: Opacity

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

Address: USGS EROS Data Center

Address: 47914 252nd Street

City: Sioux Falls

State_or_Province: SD

Postal_Code: 57198-0001

Country: USA

Contact_Voice_Telephone: 605/594-6151

Contact_TDD/TTY_Telephone: N/A

Contact_Facsimile_Telephone: 605/594-6589

Contact_Electronic_Mail_Address: custserv@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 mapping zone 66 can be directed to the NLCD 2001 land cover mapping team at the USGS EROS Data Center (EDC), 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: Arc/Info Export Format and/or ArcView Shapefile

Format_Version_Number: ArcGIS 8.3

Format_Specification: ASCII

Transfer_Size: 0.000

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name: <http://seamless.usgs.gov>

Access_Instructions:

The URL <http://seamless.usgs.gov> provides a map interface that allows for data downloads within a customer defined area of interest. Zoom tools are available that can be used to investigate areas of interest on the map interface. The download tool allows the customer to capture layers from the map, utilizing the Seamless Data Distribution System process for downloading. A request summary page is then generated with the download layers listed. By clicking the "download" button on the summary page, a zipped file will be generated that can be saved on the customer's computer. The file can then be unzipped and imported into various user software applications.

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: 20060706

Metadata_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: U.S. Geological Survey

Contact_Person: REQUIRED: The person responsible for the metadata information.

Contact_Position: Customer Services Representative

Contact_Address:

Address_Type: mailing and physical address

Address: EROS Data Center

Address: 47914 252nd Street

City: Sioux Falls

State_or_Province: SD

Postal_Code: 57198-0001

Country: USA

Contact_Voice_Telephone: 605/594-6151

Contact_TDD/TTY_Telephone: 605/594-6933

Contact_Facsimile_Telephone: 605/594-6589

Contact_Electronic_Mail_Address: custserv@usgs.gov

Hours_of_Service: 0800 - 1600 CT, M - F (-6h CST/-5h CDT GMT)

Metadata_Standard_Name: FGDC Content Standards 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

Metadata_Extensions:

Online_Linkage: <http://www.esri.com/metadata/esriprof80.html>

Profile_Name: ESRI Metadata Profile

Metadata_Extensions:

Online_Linkage: <http://www.esri.com/metadata/esriprof80.html>

Profile_Name: ESRI Metadata Profile