Metadata:
  Identification_Information:
    Citation:
      Citation_Information:
        Originator: Jo Ann M. Gronberg, U.S. Geological Survey
        Publication_Date: 20121001
        Title: NAWQA GIS ancillary data: Nitrogen contributions from atmospheric deposition for 500-m buffers around groundwater sampling sites
        Geospatial_Data_Presentation_Form: tabular digital data
        Online_Linkage: http://water.usgs.gov/nawqa-only/gw.html
    Description:
      Abstract: This data set consists of 1985-2001 annual nitrogen from atmospheric deposition (kg/sqkm) for 500-m buffers around NAWQA groundwater sampling sites. The nitrogen deposition data is from the National Atmospheric Deposition Program.
      Purpose: This is one of the ancillary GIS data layers developed to characterize NAWQA groundwater studies for national synthesis of water-quality data.
      Supplemental_Information:
        The data set does not include Alaska and Hawaii. Sites outside of the atmospheric deposition input grids are coded as missing data (-9999).
         
        The previous version (2006) of this data set was created by Kerie J. Hitt using the November 2005 version of NAWQAPT and the 2005 version of the nitrogen atmospheric deposition grids.
         
        This is for internal use only.
    Time_Period_of_Content:
      Time_Period_Information:
        Range_of_Dates/Times:
          Beginning_Date: 19850101
          Ending_Date: 20010101
      Currentness_Reference: Ground conditions.
    Status:
      Progress: Complete
      Maintenance_and_Update_Frequency: As needed
    Spatial_Domain:
      Bounding_Coordinates:
        West_Bounding_Coordinate: -125
        East_Bounding_Coordinate: -66
        North_Bounding_Coordinate: 24
        South_Bounding_Coordinate: 50
    Keywords:
      Theme:
        Theme_Keyword_Thesaurus: None
        Theme_Keyword: groundwater, surface water, water quality, nutrients, nitrogen, atmospheric deposition, NADP
      Place:
        Place_Keyword_Thesaurus: None
        Place_Keyword: conterminous United States
    Access_Constraints: This data set is for internal USGS access only.
    Use_Constraints: This data set is for internal USGS use only.
    Point_of_Contact:
      Contact_Information:
        Contact_Organization_Primary:
          Contact_Organization: U.S. Geological Survey
          Contact_Person: Jo Ann M. Gronberg
        Contact_Address:
          Address_Type: mailing
          Address: 345 Middlefield Road, Mail Stop 470
          City: Menlo Park
          State_or_Province: California
          Postal_Code: 94025
          Country: UNITED STATES
        Contact_Voice_Telephone: 650-329-4423
        Contact_Electronic_Mail_Address: jmgronbe@usgs.gov
        Contact_Instructions: Contact via email.
    Native_Data_Set_Environment: Microsoft Windows 7 Version 6.1 (Build 7601) Service Pack 1; ESRI ArcGIS 10.0.4.4000
  Data_Quality_Information:
    Attribute_Accuracy:
      Attribute_Accuracy_Report: None.
    Logical_Consistency_Report: None.
    Completeness_Report: Data set covers groundwater sites within the conterminous United States, for 1985 through 2001.
    Lineage:
      Source_Information:
        Source_Citation:
          Citation_Information:
            Originator: Barbara Ruddy, U.S. Geological Survey
            Publication_Date: 20050725
            Title: Grids of Inorganic nitrogen atmospheric (wet) deposition for 1985 through 2001
            Edition: Version 1.0
            Online_Linkage: http://water.usgs.gov/nawqa-only/nuts/data/inputs/#AtmGrids
        Type_of_Source_Media: onLine
        Source_Time_Period_of_Content:
          Time_Period_Information:
            Range_of_Dates/Times:
              Beginning_Date: 19850101
              Ending_Date: 20010101
          Source_Currentness_Reference: Ground conditions.
        Source_Citation_Abbreviation: NDEP
        Source_Contribution: 1-kilometer resolution grids of nitrogen atmospheric deposition (1985-2001) derived from the National Atmospheric deposition Program (NADP) data (<http://nadp.sws.uiuc.edu/>).
      Source_Information:
        Source_Citation:
          Citation_Information:
            Originator: Curtis V. Price, U.S. Geological Survey
            Publication_Date: 20120601
            Title: NAWQA sampling points
            Edition: 20120620.124704
            OnLine_Linkage: http://internal.mdc.usgs.gov/NAWQA/gis/index.html
        Type_of_Source_Media: None
        Source_Time_Period_of_Content:
          Time_Period_Information:
            Single_Date/Time:
              Calendar_Date: 20120601
          Source_Currentness_Reference: Publication date.
        Source_Citation_Abbreviation: NAWQAPT
        Source_Contribution: The location of all the NAWQA groundwater sampling sites as of June 2012.
      Source_Information:
        Source_Citation:
          Citation_Information:
            Originator: Curtis V. Price, U.S. Geological Survey
            Publication_Date: 20100101
            Title: National Water-Quality Assessment (NAWQA) Area-Characterization Toolbox
            Series_Information:
              Series_Name: U.S. Geological Survey Open File-Report
              Issue_Identification: 2010-1268
            Other_Citation_Details: Price, C.V., Nakagaki, Naomi, Hitt, K.J., 2010, National Water-Quality Assessment (NACT) Area-Characterization Toolbox: U.S. Geological Survey Open-File Report 2010-1268. Available online at http://pubs.usgs.gov/of/2010/1268/.
        Type_of_Source_Media: onLine
        Source_Time_Period_of_Content:
          Time_Period_Information:
            Single_Date/Time:
              Calendar_Date: 20100101
          Source_Currentness_Reference: Publication date.
        Source_Citation_Abbreviation: NACT
        Source_Contribution: ArcGIS toolbox composed of a collection of custom tools that implement geographic informaiton (GIS) techniques used by the NAWQA Program to characterize aquifer areas, drainage basins, and sampled wells. Version 2012-0807 is used.
      Process_Step:
        Process_Description:
          The basic procedure was to create a 500-meter radius circular buffer around each NAWQA groundwater sampling site, then calculate a weighted average for the buffer for nitrogen deposition rate.
           
          ! 1) Limited NAWQAPT to groundwater sites.
          ! Tool: Analysis>Extract>Select tool
          ! Criteria:  ("SUID" <> 'cook' AND "SUID" <> 'oahu') AND ~
          ! ( "STYPE" = 'GW' OR "STYPE" = 'GW-CR' OR "STYPE" = 'GW-HZ' OR ~
          ! "STYPE" = 'GW-IW' OR "STYPE" = 'GW-MW' OR "STYPE" = 'GW-TH')
          ! Input: NAWQA sampling points (NAWQAPT) 
          ! Output: groundwater sites (point_Select).
          ! 
          ! 2) Populated groundwater sites with PROCGRP 
          !      (buffers of sites with the same PROCGRP value do not overlap).
          ! Tool: Join
          ! Input: NawqaGWBuf_point (contains PROCGRP; provided by NACT tool)
          ! Input: groundwater sites (point_Select)
          ! Output: groundwater sites with PROCGRP (point_Select)
          !
          ! 3) Separated groundwater sites into a set with PROCGRP and 
          !      a set without PROCGRP.
          ! Tool: Analysis>Extract>Select tool
          ! Criteria: PROCGRP > 0
          ! Input: point_Select
          ! Output: gwpnts_w_procgrp
          !
          ! Criteria: PROCGRP < 1
          ! Input: point_Select
          ! Output: gwpnts_wo_procgrp
          !
          ! 4) Created buffers for each group of sites
          ! Tool: Buffer
          ! Criteria: 500 meters
          ! Input: gwpnts_w_procgrp
          ! Output: gwbuff1
          !
          ! Input: gwpnts_wo_procgrp
          ! Output: gwbuff2
          ! 
          ! 5) Generated "GRP" for sites without PROCGRP 
          !      (buffers of sites with the same GRP value do not overlap).
          ! Tool: NACT Addons>Watersheds>Group Non-overlapping Polygons
          ! Input: gwbuff2
          ! Output: gwbuff2_new
          ! 
          ! 6) Combined gwbuff1 and gwbuff2_new
          ! Added PROCGRP item to gwbuff2_new.
          ! Calculated PROCGRP =  1432 (last PROCGRP number in gwbuff1) + "GRP". 
          ! Made items in gwbuff1 and gwbuff2_new the same.
          ! 
          ! Tool: Merge
          ! Input: gwbuff1 AND gwbuff2_new
          ! Output: gwbuff 
          !
          ! 7) Resampled the 1-kilometer grid of nitrogen atmospheric deposition 
          !      for 1985 (atmsqkm85g) to create a 500-meter grid 
          !      (atmsqkm85g_Resample), because the 500-meter buffer was smaller 
          !      than the 1-km grid cell - a condition that prevents the Feature 
          !      Statistics to Table tool from working.
          ! Tool: Resample
          ! Input: atmsqkm85g
          ! Output: atmsqkm85g_Resample
          !
          ! 8) Determined the average nitrogen deposition rate for the buffered 
          !      groundwater sites.
          ! Tool: NAWQA Area-Characterization Tools > Feature Statistics to Table
          ! Criteria: Mean
          ! Input: gwbuff AND atmsqkm85g_Resample
          ! Output: gwbuff_atm85_FSTT.dbf
          !
          NOTE: This tool computes statistics summarizing raster cell values for areas covered by each feature in a feature class and write the results to a table. In this case, the mean nitrogen deposition rate (kg/sqkm) was determined from the nitrogen atmospheric deposition grid for the buffer area for each site. Processing occurred at the 30-meter resolution (snapped to the nlcde grid).
          !
          ! 9) Joined output file to gwbuff table.
          ! Tool: Join
          ! Input: gwbuff.dbf AND gwbuff_atm85_FSTT.dbf
          ! Output: gwbuff.dbf
          !
          ! 10) Repeated steps 7 through 9 for 1986 through 2001.
          !
          ! 11) Output gwbuff.dbf with atmospheric deposition data as atmdep.dbf.
          !
          ! 12) Cleaned up file and saved as gwbuf_ndep_sep2012.txt.
        Process_Date: 20121001
  Entity_and_Attribute_Information:
    Detailed_Description:
      Entity_Type:
        Entity_Type_Label: gwbuf_ndep_sep2012.txt
        Entity_Type_Definition: data file of nitrogen from atmospheric deposition
        Entity_Type_Definition_Source: USGS
      Attribute:
        Attribute_Label: STAID
        Attribute_Definition: NAWQA station identifier
        Attribute_Definition_Source: USGS
        Attribute_Domain_Values:
          Enumerated_Domain:
            Enumerated_Domain_Value: Integer
            Enumerated_Domain_Value_Definition: NAWQA station identifier
            Enumerated_Domain_Value_Definition_Source: USGS
      Attribute:
        Attribute_Label: NDEP85
        Attribute_Definition: 1985 average nitrogen deposition rate (kg/sqkm)
        Attribute_Definition_Source: USGS
        Attribute_Domain_Values:
          Enumerated_Domain:
            Enumerated_Domain_Value: Number
            Enumerated_Domain_Value_Definition: 1985 average nitrogen deposition rate (kg/sqkm); -9999, no data
            Enumerated_Domain_Value_Definition_Source: USGS
      Attribute:
        Attribute_Label: NDEP86
        Attribute_Definition: 1986 average nitrogen deposition rate (kg/sqkm)
        Attribute_Definition_Source: USGS
        Attribute_Domain_Values:
          Enumerated_Domain:
            Enumerated_Domain_Value: Number
            Enumerated_Domain_Value_Definition: 1986 average nitrogen deposition rate (kg/sqkm); -9999, no data
            Enumerated_Domain_Value_Definition_Source: USGS
      Attribute:
        Attribute_Label: NDEP87
        Attribute_Definition: 1987 average nitrogen deposition rate (kg/sqkm)
        Attribute_Definition_Source: USGS
        Attribute_Domain_Values:
          Enumerated_Domain:
            Enumerated_Domain_Value: Number
            Enumerated_Domain_Value_Definition: 1987 average nitrogen deposition rate (kg/sqkm); -9999, no data
            Enumerated_Domain_Value_Definition_Source: USGS
      Attribute:
        Attribute_Label: NDEP88
        Attribute_Definition: 1988 average nitrogen deposition rate (kg/sqkm)
        Attribute_Definition_Source: USGS
        Attribute_Domain_Values:
          Enumerated_Domain:
            Enumerated_Domain_Value: Number
            Enumerated_Domain_Value_Definition: 1988 average nitrogen deposition rate (kg/sqkm); -9999, no data
            Enumerated_Domain_Value_Definition_Source: USGS
      Attribute:
        Attribute_Label: NDEP89
        Attribute_Definition: 1989 average nitrogen deposition rate (kg/sqkm)
        Attribute_Definition_Source: USGS
        Attribute_Domain_Values:
          Enumerated_Domain:
            Enumerated_Domain_Value: Number
            Enumerated_Domain_Value_Definition: 1989 average nitrogen deposition rate (kg/sqkm); -9999, no data
            Enumerated_Domain_Value_Definition_Source: USGS
      Attribute:
        Attribute_Label: NDEP90
        Attribute_Definition: 1990 average nitrogen deposition rate (kg/sqkm)
        Attribute_Definition_Source: USGS
        Attribute_Domain_Values:
          Enumerated_Domain:
            Enumerated_Domain_Value: Number
            Enumerated_Domain_Value_Definition: 1990 average nitrogen deposition rate (kg/sqkm); -9999, no data
            Enumerated_Domain_Value_Definition_Source: USGS
      Attribute:
        Attribute_Label: NDEP91
        Attribute_Definition: 1991 average nitrogen deposition rate (kg/sqkm)
        Attribute_Definition_Source: USGS
        Attribute_Domain_Values:
          Enumerated_Domain:
            Enumerated_Domain_Value: Number
            Enumerated_Domain_Value_Definition: 1991 average nitrogen deposition rate (kg/sqkm); -9999, no data
            Enumerated_Domain_Value_Definition_Source: USGS
      Attribute:
        Attribute_Label: NDEP92
        Attribute_Definition: 1992 average nitrogen deposition rate (kg/sqkm)
        Attribute_Definition_Source: USGS
        Attribute_Domain_Values:
          Enumerated_Domain:
            Enumerated_Domain_Value: Number
            Enumerated_Domain_Value_Definition: 1992 average nitrogen deposition rate (kg/sqkm); -9999, no data
            Enumerated_Domain_Value_Definition_Source: USGS
      Attribute:
        Attribute_Label: NDEP93
        Attribute_Definition: 1993 average nitrogen deposition rate (kg/sqkm)
        Attribute_Definition_Source: USGS
        Attribute_Domain_Values:
          Enumerated_Domain:
            Enumerated_Domain_Value: Number
            Enumerated_Domain_Value_Definition: 1993 average nitrogen deposition rate (kg/sqkm); -9999, no data
            Enumerated_Domain_Value_Definition_Source: USGS
      Attribute:
        Attribute_Label: NDEP94
        Attribute_Definition: 1994 average nitrogen deposition rate (kg/sqkm)
        Attribute_Definition_Source: USGS
        Attribute_Domain_Values:
          Enumerated_Domain:
            Enumerated_Domain_Value: Number
            Enumerated_Domain_Value_Definition: 1994 average nitrogen deposition rate (kg/sqkm); -9999, no data
            Enumerated_Domain_Value_Definition_Source: USGS
      Attribute:
        Attribute_Label: NDEP95
        Attribute_Definition: 1995 average nitrogen deposition rate (kg/sqkm)
        Attribute_Definition_Source: USGS
        Attribute_Domain_Values:
          Enumerated_Domain:
            Enumerated_Domain_Value: Number
            Enumerated_Domain_Value_Definition: 1995 average nitrogen deposition rate (kg/sqkm); -9999, no data
            Enumerated_Domain_Value_Definition_Source: USGS
      Attribute:
        Attribute_Label: NDEP96
        Attribute_Definition: 1996 average nitrogen deposition rate (kg/sqkm)
        Attribute_Definition_Source: USGS
        Attribute_Domain_Values:
          Enumerated_Domain:
            Enumerated_Domain_Value: Number
            Enumerated_Domain_Value_Definition: 1996 average nitrogen deposition rate (kg/sqkm); -9999, no data
            Enumerated_Domain_Value_Definition_Source: USGS
      Attribute:
        Attribute_Label: NDEP97
        Attribute_Definition: 1997 average nitrogen deposition rate (kg/sqkm)
        Attribute_Definition_Source: USGS
        Attribute_Domain_Values:
          Enumerated_Domain:
            Enumerated_Domain_Value: Number
            Enumerated_Domain_Value_Definition: 1997 average nitrogen deposition rate (kg/sqkm); -9999, no data
            Enumerated_Domain_Value_Definition_Source: USGS
      Attribute:
        Attribute_Label: NDEP98
        Attribute_Definition: 1998 average nitrogen deposition rate (kg/sqkm)
        Attribute_Definition_Source: USGS
        Attribute_Domain_Values:
          Enumerated_Domain:
            Enumerated_Domain_Value: Number
            Enumerated_Domain_Value_Definition: 1998 average nitrogen deposition rate (kg/sqkm); -9999, no data
            Enumerated_Domain_Value_Definition_Source: USGS
      Attribute:
        Attribute_Label: NDEP99
        Attribute_Definition: 1999 average nitrogen deposition rate (kg/sqkm)
        Attribute_Definition_Source: USGS
        Attribute_Domain_Values:
          Enumerated_Domain:
            Enumerated_Domain_Value: Number
            Enumerated_Domain_Value_Definition: 1999 average nitrogen deposition rate (kg/sqkm); -9999, no data
            Enumerated_Domain_Value_Definition_Source: USGS
      Attribute:
        Attribute_Label: NDEP00
        Attribute_Definition: 2000 average nitrogen deposition rate (kg/sqkm)
        Attribute_Definition_Source: USGS
        Attribute_Domain_Values:
          Enumerated_Domain:
            Enumerated_Domain_Value: Number
            Enumerated_Domain_Value_Definition: 2000 average nitrogen deposition rate (kg/sqkm); -9999, no data
            Enumerated_Domain_Value_Definition_Source: USGS
      Attribute:
        Attribute_Label: NDEP01
        Attribute_Definition: 2001 average nitrogen deposition rate (kg/sqkm)
        Attribute_Definition_Source: USGS
        Attribute_Domain_Values:
          Enumerated_Domain:
            Enumerated_Domain_Value: Number
            Enumerated_Domain_Value_Definition: 2001 average nitrogen deposition rate (kg/sqkm); -9999, no data
            Enumerated_Domain_Value_Definition_Source: USGS
    Overview_Description:
      Entity_and_Attribute_Overview:
        The data set is organized by STAID (station id).
          
        The nitrogen atmospheric deposition rate numbers represent weighted averages for the groundwater buffer.  Missing data is -9999.
         
        The fields are:
         
        STAID    NAWQA station id
        NDEP85    1985 average nitrogen deposition rate (kg/sqkm)
        NDEP86    1986 average nitrogen deposition rate (kg/sqkm)
        NDEP87    1987 average nitrogen deposition rate (kg/sqkm)
        NDEP88    1988 average nitrogen deposition rate (kg/sqkm)
        NDEP89    1989 average nitrogen deposition rate (kg/sqkm)
        NDEP90    1990 average nitrogen deposition rate (kg/sqkm)
        NDEP91    1991 average nitrogen deposition rate (kg/sqkm)
        NDEP92    1992 average nitrogen deposition rate (kg/sqkm)
        NDEP93    1993 average nitrogen deposition rate (kg/sqkm)
        NDEP94    1994 average nitrogen deposition rate (kg/sqkm)
        NDEP95    1995 average nitrogen deposition rate (kg/sqkm)
        NDEP96    1996 average nitrogen deposition rate (kg/sqkm)
        NDEP97    1997 average nitrogen deposition rate (kg/sqkm)
        NDEP98    1998 average nitrogen deposition rate (kg/sqkm)
        NDEP99    1999 average nitrogen deposition rate (kg/sqkm)
        NDEP00    2000 average nitrogen deposition rate (kg/sqkm)
        NDEP01    2001 average nitrogen deposition rate (kg/sqkm)
      Entity_and_Attribute_Detail_Citation: None
  Distribution_Information:
    Distributor:
      Contact_Information:
        Contact_Organization_Primary:
          Contact_Organization: U.S. Geological Survey
          Contact_Person: Jo Ann M. Gronberg
        Contact_Address:
          Address_Type: mailing
          Address: 345 Middlefield Road, Mail Stop 470
          City: Menlo Park
          State_or_Province: California
          Postal_Code: 94025
          Country: UNITED STATES
        Contact_Voice_Telephone: 650-329-4423
        Contact_Electronic_Mail_Address: jmgronbe@usgs.gov
        Contact_Instructions: Contact via email.
    Distribution_Liability: See access and use constraints information.
  Metadata_Reference_Information:
    Metadata_Date: 20121004
    Metadata_Contact:
      Contact_Information:
        Contact_Organization_Primary:
          Contact_Organization: U.S. Geological Survey
          Contact_Person: Jo Ann M. Gronberg
        Contact_Address:
          Address_Type: mailing
          Address: 345 Middlefield Road, Mail Stop 470
          City: Menlo Park
          State_or_Province: California
          Postal_Code: 94025
          Country: UNITED STATES
        Contact_Voice_Telephone: 650-329-4423
        Contact_Electronic_Mail_Address: jmgronbe@usgs.gov
        Contact_Instructions: Contact via email.
    Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata
    Metadata_Standard_Version: FGDC-STD-001-1998
    Metadata_Time_Convention: local time
    Metadata_Use_Constraints: This data set is for internal USGS use only.