Presentation on theme: "Census Geographic Area Programs and Geographic Products Update"— Presentation transcript:
1 Census Geographic Area Programs and Geographic Products Update Michael RatcliffeGeography DivisionUS Census BureauLet’s Focus on Census Geography WorkshopGIS-TApril 11, 2010
2 Public Use Microdata Areas Minimum population: 100,000Super-PUMAs will not be defined.Anticipate publication of proposed criteria in Federal Register, Summer 2010.Delineation program expected start: Spring 2011.SDCs will delineate PUMAs.
3 Public Use Microdata Areas PUMAs will be used to tabulate and present data for:2010 Census Public Use Microdata Sample (PUMS) FilesAmerican Community Survey PUMS FilesAmerican Community Survey 1-year data
4 PUMAs follow county boundaries where possible PUMAs follow county boundaries where possible. May cover large land areas due to minimum population requirement.
5 Counties with populations greater than 200,000 may contain multiple PUMAs. Census tracts may be aggregated to form PUMAs.
6 Traffic Analysis Zones Two types of areas:Traffic Analysis ZonesDefined based on 2010 census blocksTraffic Analysis DistrictsAggregations of TAZs
7 Traffic Analysis Zones Draft Program Schedule TaskStartFinishAASHTO/FHWA submits short version of requirements to Census BureauNovember 2009AASHTO/FHWA submits formal version of requirements to Census BureauFebruary 2010MAF/TIGER Partnership Software DevelopmentFebruary 2011Spatial Files, MTPS, Delineation Guidelines and Documentation Distributed to MPOsApril 2011State DOTs and MPOs delineateTAZs and TADsAugust 2011Census Bureau reviews and inserts TAZs into MAF/TIGER databaseNovember 2011
8 Traffic Analysis Zones TAZ Delineation Software:MAF/TIGER Partnership Software will be utilizedBlock Equivalency FilesCaliper Corporation has reviewed and commented on software requirementsCensus Bureau will need a list of counties (towns in New England) associated with each MPO
9 Statistical Areas Program Census tractsBlock groupsCensus county divisionsCensus designated placesDelineated areas were entered into the MAF/TIGER data base December 2009Currently verifying final boundaries
10 Statistical Areas No longer just for the decennial census! ACS will tabulate data for all statistical areasEconomic Census data tabulated for CDPs:5,000 or more people5,000 or more workers
11 Census Tracts and Block Group Thresholds Census Tract ThresholdsCensus 20002010 Census PopulationPopulationHousing UnitOptimum4,0001,600Minimum1,5001,200480Maximum8,0003,200Block Group ThresholdsCensus 20002010 Census PopulationPopulationHousing UnitOptimum1,500---Minimum600480Maximum3,0001,2002.5 persons per Household.We have had a number of comments asking us to switch to HU counts, because of ease of validation, although data disclosure issues primarily involve population and not HUs. Thus we will allow locals to use either threshold.In addition, the HU counts allow a better definition of seasonal communities that may receive ACS data.
12 TIGER/Line and Map Products Public TIGER/Line ShapefilesReference MapsCongressional District mapsP.L County Block MapsCensus Tract Outline MapsCensus 2010 Block MapsThematic MapsLoss and Gain of Seats in Congress by StatePopulation Distribution (“Nighttime”) Map
13 Geographic Relationship Files 2000 Tabulation Block to 2010 Collection Block2000 Tabulation Block to 2010 Tabulation Block2010 Current (ACS) Block to 2010 Tabulation Block2010 Collection Block to 2010 Tabulation Block2000 Census Tract to 2010 Census TractOther Potential Relationship Files?
14 Geographic Reference Products Gazetteer FilesCountiesCounty subdivisionsPlacesGeographic Area Inventory Lists (with population, housing units, and land area)Geographic Change NotesGeographic Terms and Concepts
15 Questions? Comments?Michael Ratcliffe Geography Division U.S. Census Bureau