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Census Geographic Programs Cathy Friedenreich Geographic Coordinator Charlotte Regional Census Center 1.

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Presentation on theme: "Census Geographic Programs Cathy Friedenreich Geographic Coordinator Charlotte Regional Census Center 1."— Presentation transcript:

1 Census Geographic Programs Cathy Friedenreich Geographic Coordinator Charlotte Regional Census Center 1

2 Census Geographic Programs MAF/TIGER Accuracy Improvement Project (MTAIP) Local Update of Census Addresses Program (LUCA) Participant Statistical Areas Program (PSAP) Redistricting Data Program Tribal Programs Boundary and Annexation Survey (BAS) 2

3 3 Major Sources of Census Data 2010 Census – A very short form for basic data American Community Survey (ACS) - Sample data Estimates Program and other data programs ~ All of these data are tied to geography ~ To support the collection of data that are as complete and accurate as possible To provide useful, current geographic areas for data tabulations. Two Objectives of Census Geography Programs

4 4 MAF/TIGER Database (MTDB) MAF – Master Address File Census address list – used to distribute questionnaires TIGER – Topologically Integrated Geographic Encoding and Referencing Geographic data ~ Base map features ~ Address ranges and ZIP codes ~ Geographic areas

5 5 MAF/TIGER Accuracy Improvement Project (MTAIP) Accurate road centerline and other layers Sources created by contractor Sources Realign matching features in TIGER Add features missing from TIGER Rubber sheet features not in a source Copy attributes where missing from TIGER Harvest attributes for existing TIGER features TIGER Updates

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7 7 Source centerline 2000 Census TIGER/Line features and MTAIP Source centerline

8 8 Geographic Areas in TIGER/Line Shapefiles When linear features are realigned, boundaries following those features also are realigned Thus shapefiles for census tracts, census blocks, and other geographic areas are more accurate and generally will line up with positionally accurate local layers

9 9 Local centerlines and streams overlaid on block boundaries from Census 2000 TIGER/Line file

10 10 Block boundaries From realigned TIGER p

11 Census TIGER/Line features and 2007 TIGER/Line Shapefile features

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13 13 Public Products Census-developed format – must be converted for use in GIS TIGER/Line – 1989 to 2006 Up to 60 layers, current and 2000 geography TIGER/Line Shapefiles

14 14 Road features in TIGER/LINE Shapefiles Generally consistent nationwide road centerline Free download from ( Follow the TIGER links or go directly to

15 CENSUS Local Update of Census Addresses (LUCA) (LUCA)

16 16 Whats Next?

17 17 Next Steps 1.Census Bureau processes updates – Feb-Aug Address Canvassing Operation - Spring/Summer 2009

18 Census LUCA Schedule – Feedback and Appeals 1.Feedback materials sent Option 1 & 2 - Updated Address List, Address Count List, Census Maps Option 3 - Updated Address Count List and Maps 2.Discrepancies appealed 3.All Title 13 U.S.C. materials including copies returned or destroyed

19 19 Participant Statistical Areas Program Census tracts Block groups Census designated places (CDPs) Census county divisions (CCDs) (selected states) (not NC) Participants review and update

20 20 Participant Statistical Areas Program Census Tracts

21 21 Participant Statistical Areas Program Relatively permanent Small-area divisions of counties defined for the tabulation of census data The primary goal: to provide a set of nationally consistent small, statistical geographic units with stable boundaries that facilitate analysis of data across time Census Tract Characteristics

22 22 Participant Statistical Areas Program Compact and contiguous land areas Visible and identifiable features Optimum population size of 4,000 Census tract numbers contain 1 to 4 digits and possibly a 2-digit suffix (e.g ) Census Tract Characteristics

23 23 Participant Statistical Areas Program Minimum population threshold for most tracts is lowered to 1,200 Housing unit counts may be used (480 housing unit minimum) All types of populated tracts must meet the same thresholds Special tracts may be created large special land use areas without housing units or population Census Tract Criteria Changes for 2010

24 24 Participant Statistical Areas Program Should be limited to: Splits Split census tracts with large populations (e.g. census tracts that had a 2000 census population above 8,000) Mergers Merge census tracts with small populations (e. g. census tracts that had a 2000 census population below 1,200) Boundary adjustments Adjust boundaries where necessary to follow acceptable, visible features Census Tract Revisions

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27 27 Participant Statistical Areas Program Block Groups

28 28 Participant Statistical Areas Program Divisions of census tracts defined for the tabulation of census data Form the framework for block numbering Block Group Characteristics

29 29 Participant Statistical Areas Program

30 30 Participant Statistical Areas Program Smallest geographic areas For sample data from Census 2000 For data from the American Community Survey Block Group Characteristics

31 31 Participant Statistical Areas Program Reasonably compact and contiguous land areas Boundaries should follow visible and identifiable features Population range is 600 to 3,000 Block group numbers are unique within census tract and range from 1 to 9 Block Group Characteristics

32 32 Participant Statistical Areas Program Housing units counts may be used to meet block group thresholds (240 housing unit minimum) All types of populated block groups must meet the same threshold Special BGs may be created for large special land use areas without housing units or population Block Group Criteria Changes

33 33 Participant Statistical Areas Program Stability over time is not a requirement Block groups should be revised to meet population/housing unit thresholds Boundary adjustments – Adjust boundaries where necessary to follow acceptable, visible features Block Group Revisions

34 34 Participant Statistical Areas Program Census Designated Places (CDPs)

35 35 Participant Statistical Areas Program Closely settled, unincorporated communities that are locally recognized and identified by name Generally contain a mix of residential and commercial uses similar to that of an incorporated place of similar size Consist of contiguous territory Census Designated Place Characteristics

36 36 Participant Statistical Areas Program Boundaries should follow visible features or nonvisible state, county, or incorporated place boundaries CDPs cannot cross state lines but may be in more than one county Census Designated Place Characteristics

37 37 Participant Statistical Areas Program For 2010, boundaries may follow nonvisible features in selected circumstances Population threshold requirements were eliminated for Census 2000, but for 2010, a CDP cannot have zero population and zero housing units A CDP must represent a single, distinct community CDP Criteria Changes

38 38 Participant Statistical Areas Program PSAP Review and Update

39 39 Participant Statistical Areas Program Participants are being identified now Local participants will coordinate review for whole counties or groups of counties Review of areas begins in later this year

40 40 Participant Statistical Areas Program Participants will: Receive the review materials – Fall 2008 Make interested persons aware that the opportunity exists to review and update participant statistical areas Submit proposed revisions and updates to the Census Bureau – Fall 2008/Spring 2009 Negotiate revisions to make sure they meet Census Bureau standards

41 41 Participant Statistical Areas Program Review will use census shapefiles – no paper maps Participants must use MAF/TIGER Partnership Software (MTPS) Must provide output in specified format Census will post maps showing proposed revisions on an internet site for easy viewing and discussion

42 Redistricting Data Program Phase 1 - State Legislative District Project Phase 2 - Voting District/Block Boundary Suggestion Project (through spring 2009) Phase 3 - Delivery of the 2010 Census P.L Redistricting Data Files and Geographic Products (nlt April 1, 2011) Phase 4 - Collection of Post-2010 Census Redistricting Plans (2012 – 2013) Phase 5 - Evaluation of the 2010 Census Redistricting Data Program and Recommendations for 2020 ( ) 42

43 American Indian Areas for the 2010 Census American Indian reservations (AIRs) and Off- reservation trust lands (ORTLs) –Tribal designated statistical areas (TDSAs) –Tribal census tracts (tribal tracts) and block groups –Tribal subdivisions –Census designated places State designated tribal statistical areas (SDTSAs) 43

44 Boundary and Annexation Survey (BAS) Variety of Ways to Respond: Paper BAS MAF/TIGER Partnership Software (MTPS) Digital BAS Web-BAS (future) E-BAS (forms) Submitting a No Change Response 44

45 Boundary and Annexation Survey (BAS) 2008 BAS –May 31, 2008Survey packages received by this date will be included in the 2009 BAS materials 45

46 Boundary and Annexation Survey (BAS) 2009 BAS –September 2008Advance letter (by fax / / mail) will ask if there are changes to report and the response method the local or tribal governments prefers –February 2009BAS packages mailed out –April 1, 2009Survey packages received by this date will be included in the Population Estimates Program and the American Community SurveyPopulation Estimates ProgramAmerican Community Survey –May 31, 2009Survey packages received by this date will be included in the 2010 BAS materials (dates are approximate) 46

47 Boundary and Annexation Survey (BAS) 2010 BAS Similar cycle to 2009 BAS January 1, 2010 = Boundary reference date for the 2010 Census Last BAS for 2010 Census 47

48 48 Census Day: April 1, 2010 Census geography programs offer opportunities for local, regional, state and tribal participants to have a positive impact on the census for their areas We encourage you to take advantage of these opportunities, if appropriate, and to encourage other regional and local agencies to participate as well Active participation in census geography programs will help to create a better census and better data products for your areas

49 50 Questions? Cathy Friedenreich Geographic Coordinator U.S. Census Bureau 3701 Arco Corporate Drive, Suite 250 Charlotte, NC ( ) Fax:


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