Identification_Information: Citation: Citation_Information: Originator: Hitt, Kerie J. Publication_Date: 20061107 Title: NAWQA GIS ancillary data: National Land Cover Data enhanced (NLCDE) with GIRAS data for ground water study areas (Land Use Studies and Subunit Surveys) Online_Linkage: Description: Abstract: This data set consists of NLCDE land use percentages for NAWQA ground water study areas (Land Use Studies and Subunit Surveys.) The land use data is from the 1990's vintage NLCD 30-m data enhanced with GIRAS data. Purpose: This is one of the ancillary GIS data layers developed to characterize NAWQA ground water studies for national synthesis of water-quality data. Supplemental_Information: The NLCDE input data set did not include 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 originally was developed to represent conditions during the 1990s. The NLCDE still is being used for lack of a land use data set representative of a more current situation. Status: Progress: Complete Maintenance_and_Update_Frequency: NAWQA cycle 2 study areas will be added as their boundaries 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 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 Publication_Date: 200509 Title: Enhanced NLCD 30-meter resolution land cover grids Edition: 2, September 2005 Geospatial_Data_Presentation_Form: raster digital data Type_of_Source_Media: digital files Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1992 Source_Currentness_Reference: Ground condition Source_Citation_Abbreviation: NLCDE 92 Source_Contribution: 30-m NLCD data enhanced with GIRAS data, clipped to the 30-m 1990 county grid CO1990G (with medium resolution NOAA shoreline). 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: 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. Source_Information: Source_Citation: Citation_Information: Originator: Hitt, K.J. Publication_Date: 2006 Title: Boundaries of the land use study (LUS) and subunit survey (SUS) ground-water studies conducted by the National Water-Quality Assessment (NAWQA) study units Edition: 3 Geospatial_Data_Presentation_Form: vector digital data Publication_Information: Publication_Place: Reston, VA 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: 1991 Ending_Date: 2006 Source_Currentness_Reference: current Source_Citation_Abbreviation: GWPOLYS Source_Contribution: The boundaries of the LUS and SUS ground water study areas, as submitted by the NAWQA study units. Process_Step: Process_Date: 200403 Process_Description: Ground water study boundaries are gridded at 30 meters and snapped to the NLCDE. Data processing occurs at 30 meters resolution. The gridded ground water study area was combined with the NLCDE 30-m grid to create a NCLDE grid of each study area. The next step was to compute the land use percent for each land use category as number of cells (COUNT) of each land use divided by the total number of cells in the study area (SUM) multiplied by 100. For example, the percentage (LUPCT11) of LUC 11 (NLCDE land use code 11, open water) is calculated: !LUPCT11 = COUNT / SUM * 100 Process_Step: Process_Date: 20040628 Process_Description: Ground water study boundaries were re-gridded to correct a problem. (Previous version did not account for interior areas that are excluded from the study area.) The procedure to combine each gridded ground water study area with the corresponding NLCDE grid was repeated. Process_Step: Process_Date: 20040713 Process_Description: Received new boundary for cycle 1 SANJLUSOR1A_TRG, SANJLUSOR1B_TRG. Recalculated land use percents for these areas. Process_Step: Process_Date: 20050404 Process_Description: Recalculated land use percents for several cycle 2 areas. For the previous calculations, the doughnut holes in the some of the study areas had not been removed in the gridded versions of the study areas. This affects seven study areas: with doughnuts without doughnuts cut out (correct) not cut out (incorrect) AREAID GRID AREA (M2) GRID AREA (M2) cnbrluscr1_bnd 7,044,202,800.000 7,392,941,100.000 cnbrluscr1_trg 5,706,866,700.000 6,766,256,700.000 connlusrc1_bnd 1,756,677,600.000 2,064,634,200.000 connlusrc1_trg 587,594,700.000 610,191,000.000 connsus2_bnd 6,848,918,100.000 7,617,282,300.000 nvbrlusrc1_trg 155,431,800.000 155,443,500.000 spltluscr2_trg 207,267,300.000 228,433,500.000 Also added studies that are resampled studies, but do not have the same boundaries in cycle 2 as were used in cycle 1: albelusag1, nvbrsus2, trinsus3, sanjluscr1a, sanjlusor2a. Also added willlusag3, which has the same boundaries as cycle 1 willlusag2. Process_Step: Process_Date: 20050622 Process_Description: Replaced data for santlusrc1_bnd. The study area santlusrc1_bnd should be the same as santsus1_bnd, not the same as santsus2_bnd. Process_Step: Process_Date: 20061107 Process_Description: Reprocessed data using September 2005 version of NLCDE land use and counties and added new LUSs and MASs acadsus3, eiwasus3, linjlusrc1, lirblusrc1, pugtlusrs1, sacrlusrc1, trinsus4, usnkluscr2, usnkluscr3. Spatial_Data_Organization_Information: Indirect_Spatial_Reference: The data set is referenced by SUCODE (NAWQA study unit/network code) and AREAID (ground water study boundary coverage). Two kinds of ground water network polygon coverages exist: 1) BND coverages, which represent the entire areal extent of the hydrogeologic unit defined for study, and 2) TRG coverages, which delineate the targeted land use within the BND. Entity_and_Attribute_Information: Overview_Description: Entity_and_Attribute_Overview: The data set is organized by SUCODE and AREAID. Missing NLCDE data is indicated by land use code 99. The fields are: !SUID NAWQA study unit !SUCODE NAWQA study unit/network code !AREAID Ground water boundary coverage !LUPCT11 Percent of GW study area comprised of open water !LUPCT12 Percent of GW study area comprised of perennial ice/snow !LUPCT21 Percent of GW study area comprised of low-intensity residential !LUPCT22 Percent of GW study area comprised of high-intensity residential !LUPCT23 Percent of GW study area comprised of commercial/industrial/transportation !LUPCT25 Percent of GW study area comprised of residential w/o forest (res from GIRAS) !LUPCT26 Percent of GW study area comprised of residential w/ forest (res from GIRAS) !LUPCT31 Percent of GW study area comprised of bare rock/sand/clay !LUPCT32 Percent of GW study area comprised of quarries/strip mines/gravel pits !LUPCT33 Percent of GW study area comprised of transitional !LUPCT41 Percent of GW study area comprised of deciduous forest !LUPCT42 Percent of GW study area comprised of evergreen forest !LUPCT43 Percent of GW study area comprised of mixed forest !LUPCT51 Percent of GW study area comprised of shrubland !LUPCT61 Percent of GW study area comprised of orchards/vineyards/other !LUPCT62 Percent of GW study area comprised of orchards/vineyards/other (GIRAS) !LUPCT71 Percent of GW study area comprised of grasslands/herbaceous !LUPCT72 Percent of GW study area comprised of tundra (GIRAS) !LUPCT81 Percent of GW study area comprised of pasture/hay !LUPCT82 Percent of GW study area comprised of row crops !LUPCT83 Percent of GW study area comprised of small grains !LUPCT84 Percent of GW study area comprised of fallow !LUPCT85 Percent of GW study area comprised of urban/recreational grasses !LUPCT91 Percent of GW study area comprised of woody wetlands !LUPCT92 Percent of GW study area comprised of emergent herbaceous wetlands !LUPCT99 Percent of GW study area comprised of "no data" !SUM_PCT 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: 20061107 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