Identification_Information: Citation: Citation_Information: Originator: Hitt, Kerie J. Publication_Date: 20040818 Title: NAWQA GIS ancillary data: National Land Cover Data enhanced (NLCDE) with GIRAS data for sampling points. Online_Linkage: Description: Abstract: This data set consists of NLCDE landcover category for NAWQA sampling sites. The NLCDE data is from the 1990's vintage NLCD 30-m data enhanced with GIRAS data. The sampling sites are from the NAWQA data warehouse. Purpose: This is one of the ancillary GIS data layers developed to characterize NAWQA sampling sites for national synthesis of water-quality data. Supplemental_Information: This data set excludes Alaska and Hawaii. Time_Period_of_Content: Time_Period_Information: Multiple_Dates/Times: Single_Date/Time: Calendar_Date: 1991 Single_Date/Time: Calendar_Date: 2001 Currentness_Reference: The data set is intended to represent conditions for the early 1990's to late 1990's. Status: Progress: Complete Maintenance_and_Update_Frequency: NAWQA sampling sites are added as their locations become available. Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -125 East_Bounding_Coordinate: -66 North_Bounding_Coordinate: 50 South_Bounding_Coordinate: 24 Keywords: Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: Ground water Theme_Keyword: Surface water Theme_Keyword: Water quality Theme_Keyword: Land use Theme_Keyword: National land cover data Access_Constraints: The data set is for internal USGS access only. Use_Constraints: The data set is for internal USGS use only. Data_Quality_Information: Logical_Consistency_Report: none Completeness_Report: none Lineage: Source_Information: Source_Citation: Citation_Information: Originator: Curtis Price Publication_Date: 20030815 Title: 1992 NLCD 30-meter resolution grids enhanced with GIRAS data Edition: 1 Geospatial_Data_Presentation_Form: raster digital data Publication_Information: Publication_Place: Rapid City, SD Publisher: U.S. Geological Survey Type_of_Source_Media: digital files Source_Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 1988 Ending_Date: 1993 Source_Currentness_Reference: Publication date Source_Citation_Abbreviation: NLCDE Source_Contribution: 30-m NLCD data enhanced with GIRAS data The original NLCD land cover data does not portray some land-cover categories very well: 1) Orchards are underrepresented, especially in the east. This is apparent when comparing NLCD and 1992 Census of Agriculture county totals. 2) Alpine tundra is not represented at all in NLCD. 3) Transportation is lumped with commercial and industrial or is not captured at all in NLCD. 4) Residential areas (especially mature residential areas) are often misclassified as forest, grassland or agriculture in NLCD. Ancillary data layers from GIRAS were used to modify NLCD by burning in certain land cover data from GIRAS to the NLCD land cover map. We decided against using TIGER roads data because of coding errors in the TIGER attribute data (August 2003). !GIRAS data provided: ! Orchards/Vineyards ! Tundra (alpine areas) ! Residential Specific rules were followed to preserve as much information as possible in the result. !CHANGE NLCD TO: WHEN: PRESERVE NLCD WHEN NLCD IS: ! !Orchard GIRAS is Orchard Water, Urban, ! and state is not Orchard, Urban Grasses ! CA, FL, OR, WA ! !Tundra GIRAS is Tundra and Any category except ! NLCD is Shrubland Shrubland and ! or Herb. Grassland Herbaceous Grassland ! !Residential w/ forest GIRAS is Residential Water, Urban, ! and NLCD is forest Urban Grasses, Wetlands ! !Residential w/o forest GIRAS is Residential Water, Urban, ! and NLCD is not forest Urban Grasses, Wetlands ! Source_Information: Source_Citation: Citation_Information: Originator: Price, C. Publication_Date: 20040528 Title: NAWQA sampling points (NAWQAPT) Edition: May 2004 Geospatial_Data_Presentation_Form: vector digital data Publication_Information: Publication_Place: Rapid City, SD Publisher: U.S. Geological Survey Type_of_Source_Media: digital files Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 20040528 Source_Currentness_Reference: current Source_Citation_Abbreviation: NAWQAPT Source_Contribution: The location of all of the NAWQA sampling sites. Process_Step: Process_Date: 20040315 Process_Description: Intersected sampling points with enhanced NLCD attributes using IDENTITY. (March 2004 version of NAWQAPT.) Process_Step: Process_Date: 20040818 Process_Description: Intersected sampling points with enhanced NLCD attributes using IDENTITY. (May 2004 version of NAWQAPT.) Spatial_Data_Organization_Information: Indirect_Spatial_Reference: The data set is referenced by STAID, the station id of the NAWQA sampling site. Entity_and_Attribute_Information: Overview_Description: Entity_and_Attribute_Overview: The data set is organized by STAID (station id). The fields are: !STAID Station id !NLCDE NLCDE land use code The explanations for NLCDE codes: !NLCDE EXPLANATION !CODE !11 Open Water !12 Perennial Ice/Snow !21 Low-Intensity Residential !22 High-Intensity Residential !23 Commercial/Industrial/Transportation !25 Residential without trees (GIRAS) !26 Forested Residential (Res-GIRAS, For-NLCD) !31 Bare Rock/Sand/Clay !32 Quarries/Strip Mines/Gravel Pits !33 Transitional !41 Deciduous Forest !42 Evergreen Forest !43 Mixed Forest !51 Shrubland !61 Orchards/Vineyards/Other !62 Orchards/Vineyards (GIRAS) !71 Grasslands/Herbaceous !72 Tundra (GIRAS) !81 Pasture/Hay !82 Row Crops !83 Small Grains !84 Fallow !85 Urban/Recreational Grasses !91 Woody Wetlands !92 Emergent Herbaceous Wetlands !-999 No data (AK, HI, Canada) Entity_and_Attribute_Detail_Citation: None Distribution_Information: Distributor: Contact_Information: Contact_Person_Primary: Contact_Person: Kerie Hitt Contact_Organization: USGS NAWQA Nutrients National Synthesis Contact_Address: Address_Type: Mailing address Address: 413 National Center City: Reston State_or_Province: VA Postal_Code: 20192 Country: USA Contact_Electronic_Mail_Address: kjhitt@usgs.gov Contact_Voice_Telephone: 703 648-6854 Contact_Instructions: Contact via email Distribution_Liability: USGS assumes no liability for the use of this data set. Metadata_Reference_Information: Metadata_Date: 20040818 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Kerie Hitt Contact_Organization: USGS NAWQA Nutrients National Synthesis Contact_Address: Address_Type: Mailing address Address: 413 National Center City: Reston State_or_Province: VA Postal_Code: 20192 Country: USA Contact_Electronic_Mail_Address: kjhitt@usgs.gov Contact_Voice_Telephone: 703 648-6854 Contact_Instructions: Contact via email Metadata_Standard_Name: Content standards for digital geospatial metadata Metadata_Standard_Version: FGDC-STD-001-1998