nv_complete
Metadata:
- Identification_Information:
-
- Citation:
-
- Citation_Information:
-
- Originator: U.S. Environmental Protection Agency, ORD/NERL/LEB
- Publication_Date: April 2005
- Title: nv_complete
- Geospatial_Data_Presentation_Form: vector digital data
- Online_Linkage: N/A
- Description:
-
- Abstract:
- Field Data Collection: An ideal dataset for landcover modeling has two critical characteristics: 1) it adequately samples the range of environmental settings in a landscape, and 2) it contains enough data to robustly model each plant community of the classification. To classify the vegetation of a five state region thus requires thousands of training sites. Because of the large volume of data required, only enough time is spent at each site to collect the minimum amount of ecological detail to confidently assign an alliance labels. Field crews select training sites opportunistically based on homogeneity of plant species composition, landform, and spectral characteristics. Three essential steps are performed at each site: plant community characterization, site delineation, and photographic documentation. Plant Community Characterization: Three basic types of information that are collected for each training site: 1) ocular estimates of vegetative cover subdivided into growth form (e.g., tree, shrub, forb/graminoid) and plant species, 2) visual estimates of abiotic ground cover (e.g., rock fragments, bedrock, water), and 3) measurements and classification of the communities' landscape setting (e.g., landform, topographic attributes). Site Delineation: With the assistance of a laptop computer, a polygon delineating the training site is hand-digitized in the field. To assist in this task, field crews utilize satellite imagery, digital elevation models (DEMs), and digital raster graphs (DRGs) as guides. Field polygons are a minimum of 90x90 meter areas in most cases though some communities of special concern (e.g., riparian areas) are delineated with smaller dimensions. Photographic Documentation: To document each training site, a digital photograph is collected as a reference should any questions arise regarding it alliance, ecological system or NLCD label. To construct a vegetation map of Nevada with 50+ plant communities, we need hundreds of examples, or training sites, of each community that represent their distribution across ecological and spectral gradients. We have 6 months to collect 10,000+ training sites distributed across 60% of Nevada. Because we need to collect a large amount of data in a short time, we must use our field time efficiently. Our field methodology is designed to collect just enough information to classify the training sites according to the National Vegetation Classification System (NVCS). Consequently, we spend 5 minutes or less characterizing each site. We do not have time to collect the amount of ecological and floristic detail characteristic of most vegetation studies. We want to adequately characterize the dominant species and their approximate proportions and delineate the training site as quickly as possible. We cannot afford to spend 30 minutes at one site puzzling over unknown or rare species or precisely locating training site boundaries.
Please refer to the Access database and the Field Training Maunal for full details of the methodologies used to collect field data and for explanations of the attributes collected at each training site.
- Purpose:
- These data were used to statistically associate plant community labels with Landsat 7 ETM+ imagery and 30-meter digital elevation models to produce land cover maps for the Nevada region of responsibility.
- Time_Period_of_Content:
-
- Time_Period_Information:
-
- Single_Date/Time:
-
- Calendar_Date: November 2003
- Currentness_Reference: ground condition
- Status:
-
- Progress: Complete
- Maintenance_and_Update_Frequency: None planned
- Spatial_Domain:
-
- Bounding_Coordinates:
-
- West_Bounding_Coordinate: -120.932493
- East_Bounding_Coordinate: -112.340366
- North_Bounding_Coordinate: 42.929037
- South_Bounding_Coordinate: 34.015732
- Keywords:
-
- Theme:
-
- Theme_Keyword_Thesaurus: unknown
- Theme_Keyword: land cover
- Theme_Keyword: ground truth
- Theme_Keyword: plant communities
- Place:
-
- Place_Keyword: Nevada
- Place_Keyword: Arizona
- Place_Keyword: Utah
- Access_Constraints: none
- Use_Constraints: none
- Point_of_Contact:
-
- Contact_Information:
-
- Contact_Person_Primary:
-
- Contact_Person: Todd Sajwaj
- Contact_Organization: Lockheed-Martin Environmental Services Office
- Contact_Position: Research Scientist
- Contact_Address:
-
- Address_Type: mailing and physical address
- Address: 1050 E. Flamingo Rd., Suite E-120
- City: Las Vegas
- State_or_Province: Nevada
- Postal_Code: 89119
- Country: USA
- Contact_Voice_Telephone: 702.897.3283
- Contact_Facsimile_Telephone: 702.897.6640
- Contact_Electronic_Mail_Address: tsajwaj@lmepo.com
- Native_Data_Set_Environment:
- Microsoft Windows 2000 Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 8.2.0.700
- Data_Quality_Information:
-
- Logical_Consistency_Report:
- Please refer to the Access database and the Field Training Maunal for full details of the methodologies used to collect field data and for explanations of the attributes collected at each training site.
- Completeness_Report:
- Please refer to the Access database and the Field Training Maunal for full details of the methodologies used to collect field data and for explanations of the attributes collected at each training site.
- Lineage:
-
- Process_Step:
-
- Process_Description: Metadata imported.
- Source_Used_Citation_Abbreviation: D:\NevadaDataBrowser\downloads\gap_train\nv_train\metadata.xml
- Spatial_Data_Organization_Information:
-
- Direct_Spatial_Reference_Method: Vector
- Point_and_Vector_Object_Information:
-
- SDTS_Terms_Description:
-
- SDTS_Point_and_Vector_Object_Type: G-polygon
- Point_and_Vector_Object_Count: 17121
- SDTS_Terms_Description:
-
- SDTS_Point_and_Vector_Object_Type: Label point
- Point_and_Vector_Object_Count: 17294
- SDTS_Terms_Description:
-
- SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains
- Point_and_Vector_Object_Count: 17268
- SDTS_Terms_Description:
-
- SDTS_Point_and_Vector_Object_Type: Point
- Point_and_Vector_Object_Count: 4
- 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: coordinate pair
- Coordinate_Representation:
-
- Abscissa_Resolution: 0.002048
- Ordinate_Resolution: 0.002048
- 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: nv_complete
- Attribute:
-
- Attribute_Label: FID
- 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: Shape
- Attribute_Definition: Feature geometry.
- Attribute_Definition_Source: ESRI
- Attribute_Domain_Values:
-
- Unrepresentable_Domain: Coordinates defining the features.
- Attribute:
-
- Attribute_Label: ID
- Attribute_Definition: Area of feature in internal units squared.
- Attribute_Definition_Source: ESRI
- Attribute_Domain_Values:
-
- Unrepresentable_Domain: Positive real numbers that are automatically generated.
- Attribute:
-
- Attribute_Label: SITEID
- Attribute_Definition: Perimeter of feature in internal units.
- Attribute_Definition_Source: ESRI
- Attribute_Domain_Values:
-
- Unrepresentable_Domain: Positive real numbers that are automatically generated.
- Attribute:
-
- Attribute_Label: NV_TRAIN#
- 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: NV_TRAIN-ID
- Attribute_Definition: User-defined feature number.
- Attribute_Definition_Source: ESRI
- Attribute:
-
- Attribute_Label: ID
- Attribute:
-
- Attribute_Label: SITEID
- Distribution_Information:
-
- Resource_Description: Downloadable Data
- Standard_Order_Process:
-
- Digital_Form:
-
- Digital_Transfer_Information:
-
- Transfer_Size: 3.195
- Metadata_Reference_Information:
-
- Metadata_Date: 20050406
- Metadata_Contact:
-
- Contact_Information:
-
- Contact_Organization_Primary:
-
- Contact_Organization: Lockheed-Martin Environmental Services Office
- Contact_Person: Todd Sajwaj
- Contact_Position: Research Scientist
- Contact_Address:
-
- Address_Type: mailing and physical address
- Address: 1050 E. Flamingo Rd., Suite E-120
- City: Las Vegas
- State_or_Province: Nevada
- Postal_Code: 89119
- Country: USA
- Contact_Voice_Telephone: 702.897.3283
- Contact_Facsimile_Telephone: 702.897.6640
- Contact_Electronic_Mail_Address: tsajwaj@lmepo.com
- Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
- Metadata_Standard_Version: FGDC-STD-001-1998
- Metadata_Time_Convention: local time
- Metadata_Extensions:
-
- Online_Linkage: <http://www.esri.com/metadata/esriprof80.html>
- Profile_Name: ESRI Metadata Profile
|
|