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Census Geographic Area Programsand Geographic Products Update
Michael Ratcliffe
Geography Division
US Census Bureau
Let’s Focus on Census Geography Workshop
GIS-T
April 11, 2010
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Public Use Microdata Areas
• Minimum population: 100,000
• Super-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.
Public Use Microdata Areas
PUMAs will be used to tabulate and present data for:
• 2010 Census Public Use Microdata Sample (PUMS) Files
• American Community Survey PUMS Files• American Community Survey 1-year data
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PUMAs follow county boundaries where possible.
May cover large land areas due to minimum population requirement.
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Counties with populations greater than 200,000 may contain multiple PUMAs.
Census tracts may be aggregated to form PUMAs.
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Traffic Analysis Zones
Two types of areas:• Traffic Analysis Zones
– Defined based on 2010 census blocks
• Traffic Analysis Districts– Aggregations of TAZs
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Traffic Analysis ZonesDraft Program Schedule
Task Start FinishAASHTO/FHWA submits short version of requirements to Census Bureau
November 2009
AASHTO/FHWA submits formal version of requirements to Census Bureau
February 2010
MAF/TIGER Partnership Software Development February 2010 February 2011
Spatial Files, MTPS, Delineation Guidelines and Documentation Distributed to MPOs
April 2011 April 2011
State DOTs and MPOs delineateTAZs and TADs
April 2011 August 2011
Census Bureau reviews and inserts TAZs into MAF/TIGER database
August 2011 November 2011
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Traffic Analysis Zones
TAZ Delineation Software:• MAF/TIGER Partnership Software will be
utilized• Block Equivalency Files• Caliper Corporation has reviewed and
commented on software requirements
Census Bureau will need a list of counties (towns in New England) associated with each MPO
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Statistical Areas Program
• Census tracts• Block groups• Census county divisions• Census designated places
• Delineated areas were entered into the MAF/TIGER data base December 2009
• Currently verifying final boundaries
Statistical Areas
• No longer just for the decennial census!
• ACS will tabulate data for all statistical areas
• Economic Census data tabulated for CDPs:– 5,000 or more people– 5,000 or more workers
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Census Tracts and Block Group Thresholds
Census Tract Thresholds
Census 2000 2010 Census
Population Population Housing Unit
Optimum 4,000 4,000 1,600
Minimum 1,500 1,200 480
Maximum 8,000 8,000 3,200
Block Group Thresholds
Census 2000 2010 Census
Population Population Housing Unit
Optimum 1,500 --- ---
Minimum 600 600 480
Maximum 3,000 3,000 1,200
TIGER/Line and Map Products
• Public TIGER/Line Shapefiles
• Reference Maps– Congressional District maps
– P.L.94-171 County Block Maps
– Census Tract Outline Maps
– Census 2010 Block Maps
• Thematic Maps– Loss and Gain of Seats in Congress by State
– Population Distribution (“Nighttime”) Map
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Geographic Relationship Files
• 2000 Tabulation Block to 2010 Collection Block
• 2000 Tabulation Block to 2010 Tabulation Block
• 2010 Current (ACS) Block to 2010 Tabulation Block
• 2010 Collection Block to 2010 Tabulation Block
• 2000 Census Tract to 2010 Census Tract
Other Potential Relationship Files?
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Geographic Reference Products
• Gazetteer Files– Counties– County subdivisions– Places
• Geographic Area Inventory Lists (with population, housing units, and land area)
• Geographic Change Notes• Geographic Terms and Concepts
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Questions? Comments?
Michael RatcliffeGeography DivisionU.S. Census Bureau
michael.r.ratcliffe@census.gov301-763-8977
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