Nevada Landcover Classification

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:

Collin G. Homer, Dept. of Geography and Earth Resources, Utah State University Logan, Utah 84322

Publication_Date: 1997

Title: Nevada Landcover Classification

Geospatial_Data_Presentation_Form: raster digital data

Online_Linkage: <http://earth.gis.usu.edu/>

Description:

Purpose:

The digital landcover dataset may be used for various purposes with user's discretion. Specifically, this dataset was created for regional terrestrial biodiversity assessment. These data are not intended to be used at scales larger than 1:100,000.

Abstract:

The goal for the Nevada vegetation cover-type layer was to produce a flexible, state wide database meeting the requirements of the GAP program, as well as state and federal land management purposes. Twenty-two Thematic Mapper (TM) images were required to provide a complete, cloud free mosaic. All base images were geographically registered using 1:24,000 USGS quadrangles or USGS 1:24,000 orthoquads. All base imagery was collected between May and August from 1988 and 1991. Five major ecoregions were defined and used for cover-type modeling. The ecoregions were labeled southern, eastern, northern, central, and western. Criteria for ecoregion definition not only focused on an ecological definition of landscapes and plant biology, but also on avoiding mixing of cover-types with a high probability of spectral signature confusion. Data recorded at each training site included UTM coordinates determined from a global positioning system (GPS) receiver, vegetation composition, percent cover, soil type, topography, and a qualitative site physical and location description to assist in the location of each site on TM imagery.

Supplemental_Information:

For more detailed information see: Homer, C.G., Nevada Landcover Classification Metadata. Unpublished Document.

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 1988

Ending_Date: 1991

Currentness_Reference: ground condition

Status:

Progress: complete

Maintenance_and_Update_Frequency: none planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -120

East_Bounding_Coordinate: -113

North_Bounding_Coordinate: 42

South_Bounding_Coordinate: 35

Keywords:

Theme:

Theme_Keyword_Thesaurus: none

Theme_Keyword: landcover

Theme_Keyword: vegetation cover

Theme_Keyword: GAP

Place:

Place_Keyword_Thesaurus: none

Place_Keyword: Southwest U.S.

Place_Keyword: Nevada

Access_Constraints: none

Use_Constraints:

Appropriate scale for these data is 1: 100,000 smaller. The user assumes responsiblity when using this dataset.

Point_of_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization:

Remote Sensing/GIS Laboratory, College of Natural Resources, Utah State University

Contact_Person: Director or Assistant Director

Contact_Address:

Address_Type: mailing

Address: UMC 5275

City: Logan

State_or_Province: Utah

Postal_Code: 84322-5275

Country: USA

Contact_Voice_Telephone: 435-797-2383

Data_Set_Credit:

Collin G. Homer RS/GIS Laboratory, College of Natural Resources, UMC 5275, Utah State University, Logan, UT 84322-5275,

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report:

Five hundred eighty-seven of the 4,413 training sites (13%) were randomly selected and reserved for accuracy assessment. Selection was stratified by cover type for each ecoregion. A target of 15% of cover type sites were reserved, if cover type sample size was above 6. A greater proportion of sites were selected in cover types not digitally modeled, such as agriculture and urban areas. The completed product contained a total of 65 mapped classes, which included canopy categories in the forest and woodland cover types. Accuracy was assessed from two perspectives, model and user accuracy.

Logical_Consistency_Report: Not applicable for raster data

Completeness_Report:

All cells within this image have been attributed with a field called class_name. See Process_Description for more details.

Lineage:

Source_Information:

Source_Citation:

Citation_Information:

Originator:

United States Geological Survey EROS Data Center, National Elevation Dataset

Publication_Date: Unknown

Title: 30 Meter Digital Elevation Model

Geospatial_Data_Presentation_Form: raster digital data

Type_of_Source_Media: digital

Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 1988

Source_Currentness_Reference: publication date

Source_Citation_Abbreviation: U.S.G.S Eros Data Center

Source_Contribution:

A digital elevation model (DEM) obtained from the National Elevation Dataset (NED) in 1988 was used to generate the topographically derived ancillary datasets: elevation, slope, and aspect.

Source_Information:

Source_Citation:

Citation_Information:

Originator: United States Geological Survey, EROS Data Center

Publication_Date: 1988-1991

Title: Landsat 5 Thematic Mapper Imagery

Geospatial_Data_Presentation_Form: raster digital data

Type_of_Source_Media: digital

Source_Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 1988

Ending_Date: 1991

Source_Currentness_Reference: ground condition

Source_Citation_Abbreviation: U.S.G.S Eros Data Center

Source_Contribution: Satellite imagery used for land cover mapping

Process_Step:

Process_Date: 1995-1997

Process_Description:

1) Twenty-two Landsat 5 TM scenes were geographically registered using 1:24,000 USGS quadrangles or USGS 1:24,000 orthophoto quads. 2) Landsat scenes were standardized via histogram adjustment and mosaicked. 3) Five major ecoregions were used to avoid mixing of cover-types with high probablity of spectral signature confusion. 4) Digital classification was peformed on each ecoregion separately. Classification involved: a) Unsupervised spectral clusters using ISODATA algoritm. 100 clusters were used intially to segment the image mosaic, and resulting cluster image was evaluated by examing the average standard deviation for each signature, providing a measure of variablity for the signature. Additional ISODATA cluster images were created using incremtal increases of 25 clusters until a "point of diminishing returns" was reached based on the average standard deviation (variablity) for each signature. 5) Training data obtained from ground data collection and air photo interpretation. Legend attributes followed UNESCO hierarchical classification system. 6) Modeling was performed on each ecoregion separately and involved two phases: first, statistical association of spectral clusters with cover-type classes, and second, ecological modeling based on ancillary, DEM derived datasets.

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: raster

Raster_Object_Information:

Raster_Object_Type: pixel

Row_Count: 26481

Column_Count: 18369

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Planar:

Grid_Coordinate_System:

Grid_Coordinate_System_Name: Universal Transverse Mercator

Universal_Transverse_Mercator:

UTM_Zone_Number: 11

Transverse_Mercator:

Scale_Factor_at_Central_Meridian: 0.9996

Longitude_of_Central_Meridian: -117

Latitude_of_Projection_Origin: 0.0

False_Easting: 500000

False_Northing: 0.0

Planar_Coordinate_Information:

Planar_Coordinate_Encoding_Method: row and column

Coordinate_Representation:

Abscissa_Resolution: 30

Ordinate_Resolution: 30

Planar_Distance_Units: meters

Geodetic_Model:

Horizontal_Datum_Name: North American Datum of 1927

Ellipsoid_Name: Clarke 1866

Semi-major_Axis: 6378206.4

Denominator_of_Flattening_Ratio: 294.98

Entity_and_Attribute_Information:

Overview_Description:

Entity_and_Attribute_Detail_Citation:

See: Homer, C.G., Nevada Landcover Classification Metadata. Unpublished Document.

Entity_and_Attribute_Overview:

The following fields are present in the Nevada landcover dataset:

Complete descriptions of each landcover class are available in the document: Homer, C.G., Nevada Landcover Classification Metadata.

VALUE: Unique identifier for software.

CLASS_NAMES:

Ash Aspen_2 Aspen_3 Engelmann Spruce_2 Engelmann Spruce_3 Great Basin Subalpine pine_1 Great Basin Subalpine pine_2 Juniper_1 Juniper_2 Mojave Bristlecone_1 Mojave Bristlecone_2 Mojave Bristlecone_3 Mountain Mahogany_1 Mountain Mahogany_2 Mountain Mahogany_3 Pinyon_1 Pinyon_2 Pinyon-Juniper_1 Pinyon-Juniper_2 Ponderosa Pine_1/Mountain Shrub Ponderosa Pine_2 Sierra Lodgepole_1 Sierra Lodgepole_2 Sierra Lodgepole_3 Sierra Red Fir_2 Sierra Red Fir_3 Sierra Whitebark_1 Sierra Whitebark_2 Sierra Whitefir_3 Sierra Yellow Pine_1 Sierra Yellow Pine_2 Sierra Yellow Pine_3 Sierra Yellow Pine/Mountain Shrub Sub Alpine Fir_2 Sub Alpine Fir_3 White Fir_1 White Fir_2 White Fir_3

Bitterbrush Blackbrush Creosote-Bursage Greasewood Hopsage Mesquite Mojave Mixed Scrub Mountain Sagebrush Mountain Shrub Sagebrush Sagebrush/Perennial Grass Salt Desert Scrub Sierra Mountain Shrub Alpine Dry Meadow Grassland

Wet Meadow Barren Lowland Riparian Mountain Riparian Playas Sand Dunes Snow Urban Water Wetland

Distribution_Information:

Distributor:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Director or Assistant Director

Contact_Organization:

RS/GIS Laboratory, College of Natural Resources, Utah State University,

Contact_Address:

Address_Type: mailing address

Address: UMC 5275, Utah State University

City: Logan

State_or_Province: Utah

Postal_Code: 84322-5275

Country: U.S.A.

Contact_Voice_Telephone: 435-797-2385

Contact_Electronic_Mail_Address: irdiac@gis.usu.edu

Resource_Description: Nevada Landcover Classification

Distribution_Liability:

The RS/GIS Laboratory, Utah State University nor any institution responsible for creating this dataset are responsible for the re-distribution, content, or use of these data.

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Format_Name:

"ERDAS" ERDAS image files (ERDAS Corporation) or ArcInfo GRID format (ESRI)

Format_Version_Number: ERDAS Imagine 8.6 or Workstation ArcInfo 8.0.2

File_Decompression_Technique:

Compression type *.zip or *.tgz. For windows use WinZip. For UNIX use tar -zxf <filename>.tgz

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name: <http://earth.gis.usu.edu/>

Fees: none

Metadata_Reference_Information:

Metadata_Date: 200410

Metadata_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Directory or Assistant Director

Contact_Organization: RS/GIS Laboratory, Utah State University

Contact_Address:

Address_Type: mailing

Address: UMC 5275, Utah State University

City: Logan

State_or_Province: Utah

Postal_Code: 84322-5275

Country: U.S.A.

Contact_Voice_Telephone: 435-797-2385

Contact_Electronic_Mail_Address: irdiac@gis.usu.edu

Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001-1998

Metadata_Access_Constraints: none

Metadata_Use_Constraints: none

Metadata_Security_Information:

Metadata_Security_Classification_System: none

Metadata_Security_Classification: unclassified

Metadata_Security_Handling_Description: none

Metadata_Language: English