The Boundary and Annexation Survey (BAS)

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

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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

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Overview of Census Bureau Geographic
Areas and Concepts

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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

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Hierarchy of Census Geographies
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American Indian Areas (AIA) Hierarchy
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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

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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

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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

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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)

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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

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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

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Places

• Census Designated Places (CDPs)
• Example Paradise, Nevada

• Source http//www.public-domain-photos.com/

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Geographic Identifiers

• Code Sets
• Federal Information Processing Series (FIPS)
• American National Standard Institute (ANSI)
• Census Bureau (BAS Code)
• Code Examples
• Area Name FIPS Code ANSI Code
• State North Carolina 37 01027616
• County Transylvania 175 01008589
• Place Wilmington 74440 02405754

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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

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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

County FIPS Code
9 99 999 99999
Entity FIPS Code
State FIPS Code
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BAS Codes (Place)

• Example Wilmington (city), NC

County FIPS Code
1 37 000 74440
Entity FIPS Code
State FIPS Code
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BAS Codes (County)

• Example Transylvania County, NC

County FIPS Code
2 37 175 00000
Entity FIPS Code
State FIPS Code
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BAS Codes (Minor Civil Division)

• Example Long Creek Township, ND

County FIPS Code
3 38 023 47780
Entity FIPS Code
State FIPS Code
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BAS Codes (American Indian Area)

• Example Navajo Nation Reservation

Tribal Name (TR) Code
Example Navajo Reservation and Off Reservation
Trust Land
4 99 0161 2430
Tribal Area (TA) Code
State FIPS 99
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Census Bureau Geographic Products
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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
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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

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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

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TIGERweb

• http//tigerweb.geo.census.gov/tigerwebmain/tigerw
  eb_main.html

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BAS Homepage

• http//www.census.gov/geo/www/bas/bashome.html

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Reference Maps Census Geography
Census Tract Outline Maps
Census Block Outline Maps

• http//www.census.gov/geo/www/maps/CP_MapProducts.
  htm

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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