Metadata: Identification_Information: Citation: Citation_Information: Originator: Al LeFohn, ASL Associates. Publication_Date: unknown Title: "oz_88, oz_89" Edition: 1 Geospatial_Data_Presentation_Form: Map Publication_Information: Publication_Place: Norris, TN Publisher: Tennessee Valley Authority Description: Abstract: This dataset is a series of grid maps that portray model-based estimates of ozone exposure for the United States Standard Federal Region III (SFR 3) at 180 meter resolution, for two selected years. The dataset was obtained from Al LeFohn (via personal communication with Karl Hermann, U.S. EPA, Denver, via personal communication with the SAMAB assessment project, USFS, Asheville NC) and no endorsement is implied herein. Detailed metadata were not available for these maps. The maps are probably adequate for the purposes described herein, but it is very likely that newer maps with better estimates are now available. Purpose: These data were treated as-is, as off-the-shelf estimates of air pollution for an assessment of landscape conditions in the mid-Atlantic region (SFR 3) Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 1988 Ending_Date: 1989 Currentness_Reference: None Status: Progress: Complete Maintenance_and_Update_Frequency: None planned. Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -84 degrees West East_Bounding_Coordinate: -74 degrees West North_Bounding_Coordinate: 43 degrees North Keywords: Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: air pollution Theme_Keyword: ozone Place: Place_Keyword_Thesaurus: None Place_Keyword: United States Place_Keyword: Standard Federal Region III Access_Constraints: Unknown Use_Constraints: Unknown Point_of_Contact: Contact_Information: Contact_Person_Primary: Bruce Jones Contact_Person: Contact_Organization: EPA Landscape Ecology Division Contact_Address: Address_Type: mailing and physical address Address: U.S. Environmental Protection Agency, Box 93478 City: Las Vegas State_or_Province: Nevada Postal_Code: 89193-3478 Contact_Electronic_Mail_Address: jones.bruce@epamail.epa.gov Data_Set_Credit: This data set was obtained by Karl Hermann from the SAMAB assessment project (USFS, Asheville, NC), which contracted with ASL Associates to produce the map for the SAMAB assessment. Native_Data_Set_Environment: These data are presently stored in ARC/INFO GRID format. Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: Unknown Logical_Consistency_Report: Unknown Completeness_Report: Unknown Positional_Accuracy: Unknown Process_Step: Process_Description: Derivation of watershed summaries from air pollution estimates. Air pollution maps obtained from Karl Hermann in Arc/INFO vector format. Individual polygons represent areas with estimates of an index of surface level ozone exposure (the W126 index; Lefohn et al, 1992). As obtained, individual polygons were 1 degree by 1 degree, and the maps were rasterized at 180 meter resolution, to match maps of sulfate and nitrate deposition described elsewhere (this does not imply that ozone estimates are known at that grain size; the primary reason for re-sampling was to permit more realistic summaries of index values by watershed. Each pixel was labeled with index estimates for several years, the years 1988 and 1989 were arbitrarily selected for this analysis. The air pollution maps were overlaid with rasterized masks of watershed boundaries, created at 180 meter resolution from the watershed map known as huc_clip. Each watershed was 'clipped' from the air pollution map, and the mean values reported by ARC/INFO's GRID subsystem were obtained. These values were used as-is in the assessment analysis. Process_Date: 1996 Source_Information: Source_Citation: Citation_Information: Other_Citation_Details: Lefohn, A.S., H.P. Knudsen, D.S. Shadwick, and K.A. Hermann. 1992. Surface-level ozone exposures in the eastern United States and the potential for vegetation effects. In: Transactions of the Tropospheric Ozone and the Environmental Specialty Conference II. Air and Waste Management Association, Pittsburgh, PA. Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Raster Raster_Object_Information: Raster_Object_Type: Grid Cell Row_Count: Column_Count: Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Map_Projection: Map_Projection_Name: Lambert_Azimuthal Lambert_Azimuthal: Radius of Sphere of Reference: 6370997 Longitude_of_Central_Meridian: -100 0 0 Latitude_of_Projection_Origin: 45 0 0 False_Easting: 0.0 False_Northing: 0.0 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: Row and column Coordinate_Representation: Abscissa_Resolution: Ordinate_Resolution: Planar_Distance_Units: meters Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: {oz_88, oz_89}.VAT Entity_Type_Definition: Value attribute table of grid cells Entity_Type_Definition_Source: ARC/INFO Attribute: Attribute_Label: VALUE Attribute_Definition: Byte value representation of air pollution estimate known as the W126 index (Lefohn et al, 1992) . Attribute_Definition_Source: software computed Attribute_Domain_Values: Range_Domain: Range_Domain_Maximum: unknown Range_Domain_Minimum: 0 (integer) Attribute_Measurement_Frequency: None planned Attribute: Attribute_Label: COUNT Attribute_Definition: Number of grid cells with indicated VALUE Attribute_Definition_Source: software computed Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: positive integer Range_Domain_Maximum: positive integer Attribute_Measurement_Frequency: None planned Overview_Description: Entity_and_Attribute_Overview: The value attribute table associated with this raster: DATAFILE NAME: {oz_88, oz_89}.VAT 2 ITEMS: STARTING IN POSITION 1 COL ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME INDEXED 01 VALUE 4 10 B - - Indexed 05 COUNT 4 10 B - - - Entity_and_Attribute_Detail_Citation: Not available Distribution_Information: Distributor: Contact_Information: Contact_Person_Primary: Contact_Person: Bruce Jones Contact_Organization: EPA Landscape Ecology Division Contact_Address: Address_Type: Address: U.S. Environmental Protection Agency, Box 93478 City: Las Vegas State_or_Province: Nevada Postal_Code: 89193-3478 Contact_Electronic_Mail_Address: jones.bruce@dpamail.epa.gov Metadata_Reference_Information: Metadata_Date: 19981014 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Kurt Riitters Contact_Organization: U.S. Geological Survey- Biological Resources Division Contact_Address: Address_Type: mailing and physical address Address:NCSU Forestry Dept. Address: 3024 Biltmore Hall, NCSU City: Raleigh State_or_Province: NC Postal_Code: 27695-8002 Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata Metadata_Standard_Version: 19940608 Metadata_Security_Information: Metadata_Security_Classification_System: None Metadata_Security_Classification: Unclassified Metadata_Security_Handling_Description: None