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

The Boundary and Annexation Survey (BAS) U.S. Census Bureau Geography Division & National Processing Center. Outline. Census Bureau Geographic Entities and Concepts Introduction to the BAS Introduction to Digital BAS Digital BAS (ArcGIS & MTPS) Demonstration Paper BAS Demonstration.

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

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

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

  3. Overview of Census Bureau Geographic Areas and Concepts

  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

  5. Hierarchy of Census Geographies

  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

  8. Census Tracts 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

  9. 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

  10. 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)

  11. 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

  12. 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

  13. Places Census Designated Places (CDPs) Example: Paradise, Nevada Source: http://www.public-domain-photos.com/

  14. Geographic Identifiers Code Sets: • Federal Information Processing Series (FIPS) • American National Standard Institute (ANSI) • Census Bureau (BAS Code) Code Examples: AreaNameFIPS CodeANSI Code State North Carolina 37 01027616 County Transylvania 175 01008589 Place Wilmington 74440 02405754

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

  16. BAS Codes • 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 Entity Type {0, 1, 2, 3, 4} County FIPS Code Entity FIPS Code State FIPS Code

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

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

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

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

  21. Census Bureau Geographic Products

  22. Packet Materials • 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 http://www.census.gov/geo/www/index.html

  23. Key Census Data Products • 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 • Metropolitan Statistical Areas • Micropolitan Statistical Areas

  24. TIGER/Line Shapefiles • 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 • www.census.gov/geo/www/tiger/index.html

  25. TIGERweb • http://tigerweb.geo.census.gov/tigerwebmain/tigerweb_main.html

  26. BAS Homepage http://www.census.gov/geo/www/bas/bashome.html

  27. Reference Maps: Census Geography Census Tract Outline Maps Census Block Outline Maps • http://www.census.gov/geo/www/maps/CP_MapProducts.htm

  28. Reference and Thematic Maps American Indian and Alaska Native Areas Population Distribution of the U.S. • http://www.census.gov/geo/www/maps/CP_MapProducts.htm

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