Identification_Information: Citation: Citation_Information: Originator: Hitt, Kerie J. Publication_Date: 200702 Title: NAWQA GIS ancillary data: 1990 and 2000 Census of population and housing data for ground water study areas (Land Use Studies and Subunit Surveys) Online_Linkage: Description: Abstract: This data set consists of 1990 and 2000 population density and 1990 housing unit data (source of water, sewage disposal method, and median year built) for NAWQA ground water study areas (Land Use Studies and Subunit Surveys). The population data sets are from the 1990 and 2000 Census of Population and Housing. The housing unit data is from the 1990 Census of Population and Housing STF3a. Kerie Hitt prepared the population density input values. Curtis Price extracted the housing unit 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: Currently (May 28, 2004) the data set does not include AK or HI, but we have block group boundaries for those areas and plan to process the Census variables for these 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 mid 2000's, plus historical housing development. Status: Progress: Complete Maintenance_and_Update_Frequency: NAWQA cycle 2 study areas will be added as their boundaries become available. COOK and OAHU data will be added when time permits. Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -126.20985453 East_Bounding_Coordinate: -68.91029305 North_Bounding_Coordinate: 48.91897217 South_Bounding_Coordinate: 24.14906982 Keywords: Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: Ground water Theme_Keyword: Water quality Theme_Keyword: Population Theme_Keyword: Census Theme_Keyword: Housing Theme_Keyword: Source of water Theme_Keyword: Sewage disposal Theme_Keyword: Median year built 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: Hitt, Kerie J. Publication_Date: 1992 Title: 1990 population by block group for the United States Edition: 1 Geospatial_Data_Presentation_Form: tabular data Publication_Information: Publication_Place: Reston, VA Publisher: U.S. Geological Survey Online_Linkage: Type_of_Source_Media: digital files Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1990 Source_Currentness_Reference: Current as of 1990 Census Source_Citation_Abbreviation: uspop90.freq Source_Contribution: This data set represents 1990 population counts by block group using data from the 1990 Census of Population and Housing (PL 94-171). This is the source of 1990 population density, which is calculated as population / land area of the block group. Source_Information: Source_Citation: Citation_Information: Originator: U.S. Bureau of the Census Publication_Date: 1992 Title: Census of population and housing, 1990--Summary Tape file 3A Edition: 1 Geospatial_Data_Presentation_Form: tabular data Publication_Information: Publication_Place: Washington, DC Publisher: U.S. Bureau of the Census Online_Linkage: Type_of_Source_Media: digital files Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1990 Source_Currentness_Reference: Current as of 1990 Census Source_Citation_Abbreviation: stf3a90.dat Source_Contribution: This data set represents 1990 housing unit characteristics by block group using data from the 1990 Census of Population and Housing STF3A. This is the source of data on source of water, sewage disposal method, and median year built. Source_Information: Source_Citation: Citation_Information: Originator: Hitt, K. Publication_Date: 20030220 Title: 1990 generalized block groups for the conterminous United States Edition: 1 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: Single_Date/Time: Calendar_Date: 1990 Source_Currentness_Reference: Represents boundaries for 2000 census Source_Citation_Abbreviation: USBG90 Source_Contribution: Generalized boundaries of the 1990 block groups, which provide the basis for the 30-m grid of block group boundaries used to make the weighting table. Source_Information: Source_Citation: Citation_Information: Originator: Hitt, Kerie J. Publication_Date: 20020828 Title: 2000 population by block group for the United States Edition: 1 Geospatial_Data_Presentation_Form: tabular data Publication_Information: Publication_Place: Reston, VA Publisher: U.S. Geological Survey Online_Linkage: Type_of_Source_Media: digital files Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2000 Source_Currentness_Reference: Current as of 2000 Census Source_Citation_Abbreviation: uspop00.dat Source_Contribution: This data set represents 2000 population counts by block group using data from the 2000 Census of Population and Housing Summary File 1 (SF 1). We obtained the data from Geolytics CensusCD 2000 Short Form Blocks. This is the source of 2000 population density, which is calculated as population / land area of the block group. Source_Information: Source_Citation: Citation_Information: Originator: Hitt, K. Publication_Date: 20030220 Title: 2000 generalized block groups for the conterminous United States Edition: 1 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: Single_Date/Time: Calendar_Date: 2000 Source_Currentness_Reference: Represents boundaries for 2000 census Source_Citation_Abbreviation: USBG00 Source_Contribution: Generalized boundaries of the 2000 block groups, which provide the basis for the 30-m grid of block group boundaries used to make the weighting table. Source_Information: Source_Citation: Citation_Information: Originator: Kerie Hitt 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: 200405 Process_Description: Ground water study boundaries are gridded at 30 meters and snapped to the NLCDE. Data processing occurs at 30 meters resolution. Average Census characteristics were determined by overlaying the ground water study area with the 1990 and 2000 Census block group boundaries to create a set of block group weighting factors. The weighting factors show all block groups comprising the ground water study area and what fraction of the ground water study each block group covers. The weighting factors then are used to compute weighted averages for the Census variables. This avoids doing multiple overlays of the study area and block groups (i.e., avoids doing an overlay for each Census variable). Here is an example of part of a block group weight table: !GW STUDY BGI 2000 AREAKM2 AREAF !ucollusrc1e_trg 080490002002 0.4 0.087 AREAF = AREAKM2/TOTAL AREAKM2 !ucollusrc1e_trg 080490002004 4.3 0.913 for GW STUDY ! ______ _____ ! 4.7 1.000 (AREAF should add to 1.) !BGI is the block group identifier. Two block groups occur in the ! ground water study. !AREAKM2 is the square kilometers of each block group in the ! ground water study. !AREAF is the fraction of the ground water study represented by each ! block group. The values of 2000 population density for each 2000 BGI are: !BGI POPDENS !080490002002 3.9 !080490002004 7.6 The weighted average of population for ucollusrc1e_trg is calculated as ! ! BGI 080490002002 BGI 080490002004 TOTAL OF ALL !POPULATION AREAF * POP00 AREAF * POP00 AREAF's !DENSITY = (.087 * 3.9) + (.913 * 7.6) / (.087 + .913) = 7.2 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 a mean for each population variable was repeated. Process_Step: Process_Date: 20040722 Process_Description: Received new boundary for cycle 1 SANJLUSOR1A_TRG, SANJLUSOR1B_TRG. Recalculated data for these areas. 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 SUCODE and AREAID. The fields are: !SUID NAWQA study unit !SUCODE NAWQA study unit/network code !AREAID Ground water boundary coverage ! ! POPULATION DENSITY ! !PDENS90 1990 population density (people/km2) !PDENS00 2000 population density (people/km2) ! ! SOURCE OF WATER ! !WATPUBPV public system or private company (percent of housing units) !WATDRWEL individual well, drilled (percent of housing units) !WATDUWEL individual well, dug (percent of housing units) !WATOTH some other source of water (percent of housing units) ! ! SEWAGE DISPOSAL ! !SEWPUB Public sewer (percent of housing units) !SEWSEP Septic tank or cesspool (percent of housing units) !SEWOTH Other means of disposal (percent of housing units) ! ! AGE OF HOUSING ! !MEDYRBLT Median year built The following is from the on-line STF3A documentation (U.S. Bureau of the Census, 1992): !The data on source of water were obtained from questionnaire !item H15, which was asked at both occupied and vacant housing !units. Housing units may receive their water supply from a !number of sources. A common source supplying water to five or !more units is classified as a "Public system or private !company." The water may be supplied by a city, county, water !district, water company, etc., or it may be obtained from a well !which supplies water to five or more housing units. If the water !is supplied from a well serving four or fewer housing units, the !units are classified as having water supplied by either an !"Individual drilled well" or an "Individual dug well." Drilled !wells or small diameter wells are usually less than 1-1/2 feet !in diameter. Dug wells are usually larger than 1-1/2 feet wide !and generally hand dug. The category, "Some other source" !includes water obtained from springs, creeks, rivers, lakes, !cisterns, etc. ! !The data on sewage disposal were obtained from questionnaire !item H16, which was asked at both occupied and vacant housing !units. This item was asked on a sample basis. Housing units are !either connected to a public sewer, to a septic tank or !cesspool, or they dispose of sewage by other means. A public !sewer may be operated by a government body or by a private !organization. A housing unit is considered to be connected to a !septic tank or cesspool when the unit is provided with an !underground pit or tank for sewage disposal. The category, !"Other means" includes housing units which dispose of sewage in !some other way. Questions about source of water and sewage disposal method were not included in the 2000 Census. 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