Identification_Information: Citation: Citation_Information: Originator: Hitt, Kerie J. Publication_Date: 20080612 Title: NAWQA GIS ancillary data: Enhanced National Land Cover Data 1992 (NLCDe 92) for 500-m buffers around ground water sampling sites Online_Linkage: http://water.usgs.gov/nawqa-only/gw.html Description: Abstract: This data set consists of NLCDe 92 land use percentages for 500-meter buffers around NAWQA ground water sampling sites. The land use data is from the 30-m NLCDe 92. 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: The NLCDe 92 input data set did not include Alaska and Hawaii, so sites in Cook and Oahu have "no data." Some sites in Puget Sound fall in Canada and do not have NLCDe 92 data. 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: Land use Theme_Keyword: Land cover Theme_Keyword: NLCD Theme_Keyword: NLCDe 92 Theme_Keyword: MRLC Theme_Keyword: National land cover data Theme_Keyword: Water quality 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: Naomi Nakagaki Originator: Curtis V. Price Originator: James A. Falcone Originator: Kerie J. Hitt Originator: Barbara C. Ruddy Publication_Date: 200711 Title: Enhanced National Land Cover Data 1992 (NLCDe 92) Edition: 2005 Geospatial_Data_Presentation_Form: raster digital data Publication_Information: Publication_Place: Sacramento, CA Publisher: U.S. Geological Survey Online_Linkage: http://water.usgs.gov/lookup/getspatial?nlcde92 Type_of_Source_Media: digital files Source_Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 1986 Ending_Date: 1995 Source_Currentness_Reference: Publication date Source_Citation_Abbreviation: NLCDe 92 Source_Contribution: This source provided land cover representative of the 1990s. NLCDe 92 is the nationally-consistent source of mapped land cover used by the USGS National Water-Quality Assessment Program to analyze data collected during the first decade of sampling from 1991-2001. This 30-meter resolution digital data set was developed by overlaying USGS's original satellite imagery-based 1992 National Land Cover Data ("NLCD 92") with selected classifications from USGS's aerial-photograph-based Land Use and Land Cover (LULC) data of the 1970s to mid-1980s. The LULC data were combined with NLCD 92 because the LULC data are accepted as a better source of information for certain land cover types that are difficult to interpret from satellite imagery alone. NLCDe 92 has a 25-category land-cover classification scheme and is available as 30-meter resolution raster data. The land cover was clipped to the conterminous United States boundary and medium resolution shoreline. >NLCDe 92 LANDCOVER CODES AND DESCRIPTIONS >----------------------------------------------- >11 Open Water >12 Perennial Ice/Snow >21 Low Intensity Residential >22 High Intensity Residential >23 Commercial/Industrial/Transportation >25 LULC Residential >26 NLCD/LULC Forested Residential >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 LULC Orchards/Vineyards/Other >71 Grasslands/Herbaceous >72 LULC Tundra >81 Pasture/Hay >82 Row Crops >83 Small Grains >84 Fallow >85 Urban/Recreational Grasses >91 Woody Wetlands >92 Emergent Herbaceous Wetlands >99 Missing Data * >* added classification to fill in null data values Source_Information: Source_Citation: Citation_Information: Originator: Jo Ann Gronberg Publication_Date: 20050907 Title: GRID CO1990G -- 30-meter resolution grid of 1990 county boundaries Type_of_Source_Media: digital files Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2005 Source_Currentness_Reference: Publication date of county boundary data Source_Citation_Abbreviation: CO1990g Source_Contribution: 30-m grid of county boundaries with FIPS codes, generated from 100K county polygon coverage (COUNTY100) with medium resolution shoreline from NOAA used for clipping NLCDe 92. Source_Information: Source_Citation: Citation_Information: Originator: Curtis Price Originator: Jessica Thompson Publication_Date: 20080429 Title: NAWQA sampling points (NAWQAPT) Edition: April 2008 Geospatial_Data_Presentation_Form: vector digital data Type_of_Source_Media: digital files Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 20080429 Source_Currentness_Reference: current Source_Citation_Abbreviation: NAWQAPT Source_Contribution: The location of all of the NAWQA sampling sites as of publication date. Process_Step: Process_Date: 200805 Process_Description: The basic procedure was to create a 500-m radius circular buffer of NLCDe 92 land use around each NAWQA sampling site, then calculate what fraction of the total buffer is represented by each land use category within the buffer. Data processing occurs at 30 meters resolution. The grid representing the 500-m buffer of land use around the site was created using GRID SELECTCIRCLE. The location of each site in NAWQAPT (xcoord and ycoord) forms the center of the buffer. The land use fraction for each land use category (AREAF) is computed as the area of each land use in the buffer divided by the total area of the buffer. The land use percentage is AREAF * 100. The NLCDe 92 by buffer was derived from the county/NLCDe 92 land use weight table (GWBUF_FIPSLU.AWT) by summing the area fractions (AREAF) by unique occurrences of Station id (AREAID) and land use (NLCDe 92). >FREQUENCY GWBUF_FIPSLU.AWT GWBUF_NLCDE1 >Frequency items: AREAID, NLCDE >Summary items: AREAF, AREAKM2 Processing routines are from the NAWQA area characterization toolbox. Process_Step: Process_Date: 200805 Process_Description: Grouped the above results (multiple records for each AREAID) by AREAID. >GROUP2ROW GWBUF_NLCDE1 GWBUF_NLCDE AREAID NLCDE LUPCT NLCDe 92 numbers were multiplied by 100 and AREAF was multiplied by 100 and the name was changed to LUPCT (land use percent). The file structure now is one record for each STAID. Process_Step: Process_Date: 20080612 Process_Description: Processed NLCDe 92 using sites selected from NAWQAPT version 4/29/08. Instead of using all of the sites in NAWQAPT, only ground water (GW) sites were processed. The GW sites were selected using the GW network table and site TYPE as follows: First obtain all of the sites in the GW networks contained in the GW network table (nawqapt.gwnetc): >reselect nawqapt.net info keyfile nawqapt.gwnetc info sucode >reselect nawqapt points keyfile nawqapt.net info staid Then go back to get any points not selected that are coded as Ground Water TYPE: >asel nawqapt points TYPE = 'GW' This resulted in 9051 sites. Two sites needed for the Nutrients Circular were obtained from the Nutrients master data set: >STAID 335914102430001 >STAID 472522117054901 Of these 9053 sites, 93 fall in locations outside of the extent of NLCDe 92 in OAHU, COOK, and Canada (PUGT). Therefore these sites have no NLCDe 92 data. NLCDe 92 data now covers 8960 sites. Spatial_Data_Organization_Information: Indirect_Spatial_Reference: The data set is referenced by AREAID, the station id of the NAWQA sampling site. Entity_and_Attribute_Information: Overview_Description: Entity_and_Attribute_Overview: The data set is organized by AREAID (station id). The fields are: >AREAID NAWQA station id >NLCDE_11 Percent of 500-m buffer comprised of open water >NLCDE_12 Percent of 500-m buffer comprised of perennial ice/snow >NLCDE_21 Percent of 500-m buffer comprised of low-intensity residential >NLCDE_22 Percent of 500-m buffer comprised of high-intensity residential >NLCDE_23 Percent of 500-m buffer comprised of commercial/industrial/transportation >NLCDE_25 Percent of 500-m buffer comprised of LULC residential >NLCDE_26 Percent of 500-m buffer comprised of NLCD/LULC forested residential >NLCDE_31 Percent of 500-m buffer comprised of bare rock/sand/clay >NLCDE_32 Percent of 500-m buffer comprised of quarries/strip mines/gravel pits >NLCDE_33 Percent of 500-m buffer comprised of transitional >NLCDE_41 Percent of 500-m buffer comprised of deciduous forest >NLCDE_42 Percent of 500-m buffer comprised of evergreen forest >NLCDE_43 Percent of 500-m buffer comprised of mixed forest >NLCDE_51 Percent of 500-m buffer comprised of shrubland >NLCDE_61 Percent of 500-m buffer comprised of orchards/vineyards/other >NLCDE_62 Percent of 500-m buffer comprised of LULC orchards/vineyards/other >NLCDE_71 Percent of 500-m buffer comprised of grasslands/herbaceous >NLCDE_72 Percent of 500-m buffer comprised of LULC tundra >NLCDE_81 Percent of 500-m buffer comprised of pasture/hay >NLCDE_82 Percent of 500-m buffer comprised of row crops >NLCDE_83 Percent of 500-m buffer comprised of small grains >NLCDE_84 Percent of 500-m buffer comprised of fallow >NLCDE_85 Percent of 500-m buffer comprised of urban/recreational grasses >NLCDE_91 Percent of 500-m buffer comprised of woody wetlands >NLCDE_92 Percent of 500-m buffer comprised of emergent herbaceous wetlands >NLCDE_99 Percent of 500-m buffer comprised of "no land cover data" >SUM_LUPCT Sum of the percents of all the land use categories (approx. 100) 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: 20080612 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