The District of Columbia

BlockPly

BlockPly

by U.S. Department of Commerce, U.S. Census Bureau, Geography Division on 2010

Keywords
About: boundaries, County or equivalent entity, Table, Topological Faces, State FIPS Code, County FIPS Code, Census Tract Number, Block Group, Number, Tabulation Block Number, County Subdivision FIPS Code, Sub-minor Civil Division FIPS Code in Puerto Rico, FIPS 55 Place Code For All Places, Consolidated City FIPS Code, Urban Area Code, 106th congressional district Code, 108th congressional district Code, 5 digit ZIP Code Tabulation Area Code, 3 digit ZIP Code Tabulation Area Code, Traffic Analysis Zone Code, Voting District Code, State Legislative District Upper Chamber Code, State Legislative District Lower Chamber Code, Legislative Session Year, Urban Growth Area Code, American Indian/Alaska Native/Native Hawaiian Areas Census Code, Rreservation or Off-reservation Trust Land Indicator, Alaska Native Regional Corporation FIPS code, Tribal Subdivision Code, Metropolitan Statistical Area/Consolidated Metropolitan Statistical Area FIPS Code, Primary Metropolitan Statistical Area FIPS Code, New England County Metropolitan Area FIPS Code, Elementary School District Local Education Agency Code, Secondary School District Local Education Agency Code, Unified School District Local Education Agency Code, 1-Percent Public Use Microdata Area Code, 5-Percent Public Use Microdata Area Code, Land/water Flag
Taking place at: United States, U.S., County or Equivalent Entity, District of Columbia, 11001

Abstract

The TIGER/Line Files are shapefiles and related database files (.dbf) that are an extract of selected geographic and cartographic information from the U.S. Census Bureau's Master Address File / Topologically Integrated Geographic Encoding and Referencing (MAF/TIGER) Database (MTDB). The MTDB represents a seamless national file with no overlaps or gaps between parts, however, each TIGER/Line File is designed to stand alone as an independent data set, or they can be combined to cover the entire nation. Face refers to the areal (polygon) topological primitives that make up MTDB. A face is bounded by one or more edges; its boundary includes only the edges that separate it from other faces, not any interior edges contained within the area of the face. The Topological Faces Shapefile contains the attributes of each topological primitive face. Each face has a unique topological face identifier (TFID) value. Each face in the shapefile includes the key geographic area codes for almost all geographic areas for which the Census Bureau tabulates data for both the 2010 Census and Census 2000. The geometries of each of these geographic areas can then be built by dissolving the face geometries on the appropriate key geographic area codes in the Topological Faces Shapefile.

Purpose

In order for others to use the information in the Census MAF/TIGER database in a geographic information system (GIS) or for other geographic applications, the Census Bureau releases to the public extracts of the database in the form of TIGER/Line Shapefiles.

Access constraints

None

Use constraints


The TIGER/Line Shapefile products are not copyrighted however TIGER/Line and Census TIGER are registered trademarks of the U.S. Census Bureau. These products are free to use in a product or publication, however acknowledgement must be given to the U.S. Census Bureau as the source.
The boundary information in the TIGER/Line Shapefiles are for statistical data collection and tabulation purposes only; their depiction and designation for statistical purposes does not constitute a determination of jurisdictional authority or rights of ownership or entitlement and they are not legal land descriptions.Coordinates in the TIGER/Line shapefiles have six implied decimal places, but the positional accuracy of these coordinates is not as great as the six decimal places suggest.

Point of contact


in U.S. Department of Commerce, U.S. Census Bureau, Geography Division, Geographic Products Branch

4600 Silver Hill Road, Stop 7400
Washington DC, 20233-7400, United States

phone: 301-763-1128
fax: 301-763-4710

Data accuracy

Accuracy
Accurate against Federal Information Processing Standards (FIPS), FIPS Publication 6-4, and FIPS-55 at the 100% level for the codes and base names. The remaining attribute information has been examined but has not been fully tested for accuracy.

Logical consistency

The Census Bureau performed automated tests to ensure logical consistency and limits of shapefiles. Segments making up the outer and inner boundaries of a polygon tie end-to-end to completely enclose the area. All polygons are tested for closure.
The Census Bureau uses its internally developed geographic update system to enhance and modify spatial and attribute data in the Census MAF/TIGER database. Standard geographic codes, such as FIPS codes for states, counties, municipalities, county subdivisions, places, American Indian/Alaska Native/Native Hawaiian areas, and congressional districts are used when encoding spatial entities. The Census Bureau performed spatial data tests for logical consistency of the codes during the compilation of the original Census MAF/TIGER database files. Most of the codes for geographic entities except states, counties, urban areas, Core Based Statistical Areas (CBSAs), American Indian Areas (AIAs), and congressional districts were provided to the Census Bureau by the USGS, the agency responsible for maintaining FIPS 55. Feature attribute information has been examined but has not been fully tested for consistency.
For the TIGER/Line Shapefiles, the Point and Vector Object Count for the G-polygon SDTS Point and Vector Object Type reflects the number of records in the shapefile attribute table. For multi-polygon features, only one attribute record exists for each multi-polygon rather than one attribute record per individual G-polygon component of the multi-polygon feature. TIGER/Line Shapefile multi-polygons are an exception to the G-polygon object type classification. Therefore, when multi-polygons exist in a shapefile, the object count will be less than the actual number of G-polygons.

Completeness
Data completeness of the TIGER/Line Shapefiles reflects the contents of the Census MAF/TIGER database at the time the TIGER/Line Shapefiles were created.

Lineage / Sources

  • Census MAF/TIGER database
    online, The selected geographic and cartographic information (line segments) are derived from the U.S. Census Bureau's Master Address File Topologically Integrated Geographic Encoding and Referencing (MAF/TIGER) database.
    MAF/TIGER
    by U.S. Department of Commerce, U.S. Census Bureau, Geography Division, Unpublished material
Lineage / Processes

Distribution

To obtain more information about ordering TIGER/Line shapefiles visit http://www.census.gov/geo/www/tiger

Distribution liability
No warranty, expressed or implied is made with regard to the accuracy of these data, and no liability is assumed by the U.S. Government in general or the U.S. Census Bureau in specific as to the spatial or attribute accuracy of the data. The act of distribution shall not constitute any such warranty and no responsibility is assumed by the U.S. government in the use of these files. The boundary information in the TIGER/Line Shapefiles is for statistical data collection and tabulation purposes only; their depiction and designation for statistical purposes do not constitute a determination of jurisdictional authority or rights of ownership or entitlement and they are not legal land descriptions.

Distributed by

in U.S. Department of Commerce, U.S. Census Bureau, Geography Division, Geographic Products Branch

4600 Silver Hill Road, Stop 7400
Washington DC, 20233-7400, United States

phone: 301-763-1128
fax: 301-763-4710

Entity

BlockPly / U.S. Census Bureau

Topological Faces (Polygons With all Geocodes) County-based
shapefile

Attributes

  • FID / ESRI
    Internal feature number.
  • OBJECTID / ESRI
    Internal feature number.
  • Shape / ESRI
    Feature geometry.
  • BLOCK
  • GEOID10
  • ALAND10
    Land Area
  • AWATER10
    Water Area
  • P0010001
  • P0010002
  • P0010003
  • P0010004
  • P0010005
  • P0010006
  • P0010007
  • P0010008
  • OP000001 / Office of Planning
    Aggregation of multiple race tabulations that include "Black or African American"
  • OP000002 / Office of Planning
    Aggregation of multiple race tabulations that include "American Indian and Alaska Native"
  • OP000003 / Office of Planning
    Aggregation of multiple race tabulations that include "Asian"
  • OP000004 / Office of Planning
    Aggregation of multiple race tabulations that include "Native Hawaiian and Other Pacific Islander"
  • P0020002
  • P0020005
  • P0020006
  • P0020007
  • P0020008
  • P0020009
  • P0020010
  • OP00005 / Office of Planning
    Aggregation of non-hispanic multiple race tabulations that include "Black or African American"
  • OP00006 / Office of Planning
    Aggregation of non-hispanic multiple race tabulations that include "American Indian and Alaska Native"
  • OP00007 / Office of Planning
    Aggregation of non-hispanic multiple race tabulations that include "Asian"
  • OP00008 / Office of Planning
    Aggregation of non-hispanic multiple race tabulations that include "Native Hawaiian and Other Pacific Islander"
  • P0030001
  • P0030003
  • P0030004
  • P0030005
  • P0030006
  • P0030007
  • P0030008
  • OP00009 / Office of Planning
    Aggregation of age 18 and over multiple race tabulations that include "Black or African American"
  • OP00010 / Office of Planning
    Aggregation of age 18 and over multiple race tabulations that include "American Indian and Alaska Native"
  • OP00011 / Office of Planning
    Aggregation of age 18 and over multiple race tabulations that include "Asian"
  • OP00012 / Office of Planning
    Aggregation of age 18 and over multiple race tabulations that include "Native Hawaiian and Other Pacific Islander"
  • P0040002
  • P0040005
  • P0040006
  • P0040007
  • P0040008
  • P0040009
  • P0040010
  • OP000013 / Office of Planning
    Aggregation of non-hispanic age 18 and over multiple race tabulations that include "Black or African American"
  • OP000014 / Office of Planning
    Aggregation of non-hispanic age 18 and over multiple race tabulations that include "American Indian and Alaska Native"
  • OP000015 / Office of Planning
    Aggregation of non-hispanic age 18 and over multiple race tabulations that include "Asian"
  • OP000016 / Office of Planning
    Aggregation of non-hispanic age 18 and over multiple race tabulations that include "Native Hawaiian and Other Pacific Islander"
  • H0010001
  • H0010002
  • H0010003
  • GEOID
  • BLKGRP
  • SHAPE_LENG
  • ACRES
  • SQ_MILES
  • SHAPE_AREA / ESRI
    Area of feature in internal units squared.
  • SHAPE_AR_1
  • SHAPE_LEN

Metadata

FGDC Content Standards for Digital Geospatial Metadata / FGDC-STD-001-1998 as of 20120620

Provided by
REQUIRED: The person responsible for the metadata information.
in U.S. Department of Commerce, U.S. Census Bureau, Geography Division, Geographic Products Branch

4600 Silver Hill Road, Stop 7400
Washington DC, 20233-7400, United States

phone: 301-763-1128
fax: 301-763-4710