Identification_Information: Citation: Citation_Information: Originator: Hitt, Kerie J. Publication_Date: 200702 Title: NAWQA GIS ancillary data: STATSGO mapping unit weighting table for ground water study areas (Land Use Studies and Subunit Surveys) Online_Linkage: Description: Abstract: This data set consists of area weighting factors for STATSGO (State Soil Geographic) mapping units for NAWQA LUS and SUS areas. The weighting factors can be used to calculate average soil statistics for data compiled for STATSGO soil mapping units. 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 weighting factors are used to compute STATSGO data averages for LUS and SUS study areas. 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 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: Soil Theme_Keyword: Water quality Theme_Keyword: STATSGO Theme_Keyword: Land use study Theme_Keyword: Subunit survey Theme_Keyword: Major aquifer Theme_Keyword: Slope Theme_Keyword: Water table depth Theme_Keyword: Depth to bedrock Theme_Keyword: Permeability Theme_Keyword: Available water content Theme_Keyword: Bulk density Theme_Keyword: Organic matter content Theme_Keyword: Soil texture Theme_Keyword: Soil erodibility Theme_Keyword: Soil loss tolerance factor Theme_Keyword: Wind erodibility group Theme_Keyword: Soil hydrologic group Theme_Keyword: Soil drainage class Theme_Keyword: Hydric soil Theme_Keyword: Soil order Theme_Keyword: Vertical permeability 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: Wolock, D.M. Publication_Date: 1997 Title: STATSGO soil characteristics for the conterminous United States Series_Information: Series_Name: USGS Open-File Report Issue_Identification: 97-656 Online_Linkage: Source_Scale_Denominator: 500,000 Type_of_Source_Media: On line Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1994 Source_Currentness_Reference: Publication date of STATSGO data Source_Citation_Abbreviation: MUID Source_Contribution: 100m grid of STATSGO mapping units (MUIDs). Source_Information: Source_Citation: Citation_Information: Originator: Hitt, K.J. Publication_Date: 2004 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: 2004 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: 20040401 Process_Description: Ground water study boundaries are gridded at 30 meters and snapped to the NLCDE. Data processing occurs at 30 meters resolution. The soils mapping unit weighting factors were created by overlaying each ground water study area with the STATSGO soils geographic mapping units (MUIDs). The weighting factors show all soil mapping units comprising the ground water study area and what fraction of the ground water study each MUID covers. The weighting factors are used to compute weighted averages for the soils variables. This avoids doing multiple overlays of the study area and soils mapping units (i.e., avoids doing an overlay for each soil variable). Here is an example of part of a soils weight table: !GW STUDY MUID AREAKM2 AREAF !ucollusrc1d_trg CO103 0.7 0.861 AREAF = AREAKM2/TOTAL AREAKM2 !ucollusrc1d_trg CO111 0.1 0.072 for GW STUDY !ucollusrc1d_trg CO128 0.1 0.067 ! ______ _____ ! 0.9 1.000 (AREAF should add to 1.) ! !MUID is the soil mapping unit. Three mapping units occur in the ! ground water study. !AREAKM2 is the square kilometers of each mapping unit in the ! ground water study. !AREAF is the fraction of the ground water study represented by each ! mapping unit. The values of permeability for each MUID (from STATSGO data) are: !MUID PERMAVE !CO103 8.000 !CO111 4.822 !CO128 0.541 The weighted average of PERMAVE for ucollusrc1d_trg is calculated as ! ! MUID CO103 MUID CO111 MUID CO128 TOTAL OF ALL ! AREAF * PERMAVE AREAF * PERMAVE AREAF * PERMAVE AREAF's !MEAN-W-PERMAVE = (.861 * 8.000) + (.072 * 4.822) + (.067 * .541) / (.861 + .072 + .067) = 7.27 Processing routines are from the NAWQA area characterization toolbox. Process_Step: Process_Date: 20040701 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 calculate the weighting factors was repeated. Process_Step: Process_Date: 20040722 Process_Description: Received new boundary for cycle 1 SANJLUSOR1A_TRG, SANJLUSOR1B_TRG. Recalculated weighting factors for these areas. Process_Step: Process_Date: 20041206 Process_Description: Revised cycle 1 data file to include BNDs and TRGs. Previous version had only TRGs. Process_Step: Process_Date: 20050412 Process_Description: Recalculated data 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 AREAID. Missing data is indicated by -9999. An example of using the weighting factors to calculate average PERMAVE for a ground water study area is shown under Process_Step. Fields in the soils weighting table are: !SUID NAWQA study unit !SUCODE NAWQA study unit/network code !AREAID Ground water boundary coverage !MUID100 Numeric representation of soils mapping unit id from 100 m soils grid !AREAG Flag indicating area is within a ground water study (= 1) !AREAKM2 Square kilometers of mapping unit in the ground water study !AREAF Fraction of the ground water study represented by the MUID !MUID10_KM2 Total area of soils mapping unit !MUID10_F Fraction of soils mapping unit in the ground water study area (AREAKM2/MUID10_KM2) !MUID Soils mapping unit id 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: 200702 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