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1 The Boundary and Annexation Survey (BAS) U.S. Census Bureau Geography Division & National Processing Center.

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Presentation on theme: "1 The Boundary and Annexation Survey (BAS) U.S. Census Bureau Geography Division & National Processing Center."— Presentation transcript:

1 1 The Boundary and Annexation Survey (BAS) U.S. Census Bureau Geography Division & National Processing Center

2 2 Outline 1.Census Bureau Geographic Entities and Concepts 2.Introduction to the BAS 3.Introduction to Digital BAS 4.Digital BAS (ArcGIS & MTPS) Demonstration 5.Paper BAS Demonstration

3 3 Overview of Census Bureau Geographic Areas andConcepts

4 Census Geographic Areas Legal Areas: States Counties Minor civil divisions Incorporated places Congressional districts Legislative areas School districts Urban growth areas Statistical Areas: Census county divisions Census designated places Census tracts Census blocks Metro and micropolitan statistical areas Urban areas Public use microdata areas Traffic analysis zones 4

5 5 Hierarchy of Census Geographies

6 6 American Indian Areas (AIA) Hierarchy American Indian Reservations (federal) & Off-Reservation Trust Land Tribal Subdivision Tribal Census Tract Tribal Block Group

7 Small Geographic Areas Blocks: Smallest units for decennial Census data tabulation Cover entire nation Nest within all other types of geographic areas Generally bounded by visible features or boundaries Block Groups: Groups of blocks sharing first digit of block number Smallest units for tabulation of American Community Survey (ACS) data Population ranges from 1,000 to 3,000 Nest within census tracts 7

8 Census Tracts 8 Small, relatively permanent statistical subdivisions of a county Relatively consistent boundaries over time Size: optimally 4,000 people; range between 1,000 and 8,000 Approximately 74,000 census tracts in U.S. Defined nationwide for the first time in Census 2000; however Block Numbering Areas (BNAs) and tracts covered the entirety of the nation in 1990

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12 County Subdivisions Minor Civil Divisions (MCDs) Legally bounded entity Sub-county entities in 29 states, Puerto Rico, and the Island Areas May have a formal government with elected officials Census County Divisions (CCDs) Statistical entity Sub-county units that have stable boundaries and recognizable names in 21 states Designed to be a statistical equivalent to MCDs No minimum or maximum population requirement 12

13 Minor Civil Division (MCD) Township and Town – the most common names Other MCD names: –Election district –Magisterial district –Parish governing authority district (Louisiana only) –Supervisor district (Mississippi only) –Election precinct (Illinois and Nebraska) –Gore (Maine and Vermont) –Grant (New Hampshire and Vermont) –Location (New Hampshire only) –Plantation (Maine only) –Purchase (New Hampshire only) 13

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15 Places Incorporated Places Legally bounded entity Depending on the state, examples include cities, boroughs, towns, and villages Consolidated Cities Legally bounded entity Incorporated place that has consolidated its government functions with a county or sub-county. Ex: Indianapolis, IN and Louisville, KY 15

16 Places Census Designated Places (CDPs) Statistical entity Created to present census data for an area having a concentration of population, housing, and commercial structures Boundaries delineated by the Census Bureau, with assistance from planning organizations Locally identifiable name Not inside an existing incorporated place 16

17 Places Census Designated Places (CDPs) Example: Paradise, Nevada 17 Source:

18 Geographic Identifiers 18 Code Sets: Federal Information Processing Series (FIPS) American National Standard Institute (ANSI) Census Bureau (BAS Code) Code Examples: AreaName FIPS Code ANSI Code StateNorth Carolina CountyTransylvania PlaceWilmington

19 BAS Codes There are 5 types of entities recognized for the BAS: Entity CodeEntity Type. 0Consolidated City 1 Incorporated Place 2County or County Equivalent 3 Minor Civil Division (MCD) 4 Federally recognized American Indian reservations and off-reservation trust lands 19

20 The BAS entity code is an 11-Digit Code Entity types 0 through 3 use FIPS codes Entity type 4 uses unique code developed by Census State FIPS Code Entity FIPS Code County FIPS Code Entity Type {0, 1, 2, 3, 4} BAS Codes

21 Example: Wilmington (city), NC State FIPS Code Entity FIPS Code County FIPS Code Entity Type {0, 1, 2, 3} BAS Codes (Place)

22 Example: Transylvania County, NC State FIPS Code Entity FIPS Code County FIPS Code Entity Type {0, 1, 2, 3} BAS Codes (County)

23 Example: Long Creek Township, ND State FIPS Code Entity FIPS Code County FIPS Code Entity Type {0, 1, 2, 3} BAS Codes (Minor Civil Division)

24 State FIPS {99} Tribal Area (TA) Code Tribal Name (TR) Code Entity Type {4} Example: Navajo Reservation and Off Reservation Trust Land BAS Codes (American Indian Area) Example: Navajo Nation Reservation

25 25 Census Bureau Geographic Products

26 2010 Census Data Products: United States 2010 TIGER/Line Shapefiles Flyer Standard Hierarchy of Census Geographic Entities Map of 2010 Population Distribution in the United States Working with TIGER/Line Shapefiles: Downloading Working with TIGER/Line Shapefiles: Downloading from AFF American FactFinder Flyer 26 Packet Materials

27 December 31, 2010 – Apportionment Data to the President Feb to Mar 2011 – Redistricting Data Nov 2010 to Jan 2011 – Redistricting Geographic Files Oct 2012 – Urban/Rural Data Jul to Aug 2013 – Core-Based Statistical Areas Data 27 Key Census Data Products –Metropolitan Statistical Areas –Micropolitan Statistical Areas

28 Public product created from the MAF/TIGER database Digital files containing geographic features (roads, rivers, legal & statistical boundaries, address ranges, etc.), including information about the features and their location Covers United States, Puerto Rico, and Island Areas 2010 Shapefiles released state-by-state from December 2010 – February 2011 Updated data is released yearly 28 TIGER/Line Shapefiles

29 TIGERweb 29

30 30 BAS Homepage

31 31 Census Tract Outline Maps Census Block Outline Maps Reference Maps: Census Geography

32 32 Reference and Thematic Maps Population Distribution of the U.S. American Indian and Alaska Native Areas


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