The District of Columbia

Public Use Microdata Area (PUMAPly)

Public Use Microdata Area (PUMAPly)

by U.S. Department of Commerce, U.S. Census Bureau, Geography Division on 2007

Keywords
About: boundaries, County or equivalent entity, Polygon, Census Tract, Tract
Taking place at: United States, U.S., County or Equivalent Entity, District of Columbia, 11001

Abstract

The TIGER/Line Shapefiles are an extract of selected geographic and cartographic information from the Census MAF/TIGER database. The Census MAF/TIGER database represents a seamless national file with no overlaps or gaps between parts. However, each TIGER/Line Shapefile is designed to stand alone as an independent data set or the shapefiles can be combined to cover the whole nation.

Public Use Microdata Area (PUMA)

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.

Point of contact


in U.S. Department of Commerce, U.S. Census Bureau, Geography Division, Geographic Products Management 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
Projected to MD State Plan NAD83 (meters) by DC Office of Planning.

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 Management Branch

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

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

Entity

DCGIS.PUMAPly / U.S. Census Bureau
Census 2000 Census Tract

Attributes

  • PUMA
  • OBJECTID / ESRI
    Internal feature number.
  • SHAPE / ESRI
    Feature geometry.
  • SHAPE.AREA
  • Shape / ESRI
    Feature geometry.
  • SHAPE.LEN

Metadata

FGDC Content Standards for Digital Geospatial Metadata / FGDC-STD-001-1998 as of 01/31/2009

Provided by

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

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

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