File Geodatabase Feature Class
Tags
2012, Cartographic Boundary, Generalized, Shapefile, State, Congressional District, Boundaries
This high resolution polygon vector file represents the US Congressional Districts in the United States, as digitized at a 1:500000 scale. The data, current as of 2012, was downloaded from the US Census Bureau TIGER database and processed further by the TTU CGST.
The 2012 cartographic boundary shapefiles are simplified representations of selected geographic areas from the Census Bureau's MAF/TIGER geographic database. These boundary files are specifically designed for small-scale thematic mapping. Attributes were modified to include FIPS information, name, session, area, state name and abbreviation.
When possible generalization is performed with the intent to maintain the hierarchical relationships among geographies and to maintain the alignment of geographies within a file set for a given year. Geographic areas may not align with the same areas from another year. Some geographies are available as nation-based shapefiles while others are available only as state-based files.
The downloaded file was joined with the US State Jurisdictional boundary file to get relevant attributes. The layer was then transformed from NAD 83 to WGS 84.
There are no credits for this item.
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 is for visual display at appropriate small scales only. Cartographic boundary files should not be used for geographic analysis including area or perimeter calculation. Files should not be used for geocoding addresses. Files should not be used for determining precise geographic area relationships.
Extent
West | -179.147355 | East | 179.778455 |
North | 71.352560 | South | 18.917470 |
Maximum (zoomed in) | 1:5,000 |
Minimum (zoomed out) | 1:150,000,000 |
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 is for visual display at appropriate small scales only. Cartographic boundary files should not be used for geographic analysis including area or perimeter calculation. Files should not be used for geocoding addresses. Files should not be used for determining precise geographic area relationships.
Internal feature number.
Esri
Sequential unique whole numbers that are automatically generated.
Feature geometry.
Esri
Coordinates defining the features.
Length of feature in internal units.
Esri
Positive real numbers that are automatically generated.
Area of feature in internal units squared.
Esri
Positive real numbers that are automatically generated.
The cartographic boundary polygon shapefiles contain boundary data for a specific type of Census geography. See the U.S. Census Bureau Geographic Terms and Concepts documentation for further explanation of Census geography (http://www.census.gov/geo/www/2010census/GTC_10.pdf). Below is a list of possible fields. Attribution will vary depending on the type of geography. Field names, descriptions and data types are listed in this format: FIELD_NAME Description [data value or type]. AFFGEOID AFF Summary Level Code, nation identifier; nation FIPS code [string]; AFFGEOID10 2010 Census AFF Summary Level Code, nation identifier; nation FIPS code [string]; ALAND Current land area [number]; ALAND10 2010 Census land area [number]; CD113FP 113th congressional district FIPS code [string]; CDSESSN 113th congressional session code [string]; GEOID identifier, code [string]; GEOID10 2010 Census identifier, 2010 Census code [string]; LSAD Current name and the translated legal/statistical area description code [string]; LSAD10 2010 Census name and the translated legal/statistical area description code [string]; LSY Legislative session year [string]; NAME10 2010 Census name [string]; NAMELSAD Current name and the translated legal/statistical area description [string]; NAMELSAD10 2010 Census name and the translated legal/statistical area description [string]; SLDLST Current state legislative district lower chamber code [string]; SLDUST Current state legislative district upper chamber code [string]; STATEFP Current state FIPS code [string]; UACE10 2010 Census urban area code [string]; UATYP10 2010 Census urban area type [string]. The ALAND or ALAND10 field is the calculated area derived from the ungeneralized area of each entity in square miles. This field can be used in density calculations. Users should not calculate the area of the generalized polygons for use in any analysis. Use the GEOID field to join these spatial tables to 2010 Census data tables if needed. Some nation-based files may include Puerto Rico and the Island Areas of the United States. Island areas include American Samoa, Guam, the Commonwealth of the Northern Mariana Islands (Northern Mariana Islands), and the United States Virgin Islands.
The 2012 cartographic boundary shapefiles are simplified representations of selected geographic areas from the Census Bureau's MAF/TIGER geographic database. These boundary files are specifically designed for small-scale thematic mapping. When possible generalization is performed with the intent to maintain the hierarchical relationships among geographies and to maintain the alignment of geographies within a file set for a given year. Geographic areas may not align with the same areas from another year. Some geographies are available as nation-based shapefiles while others are available only as state-based files.The downloaded file was joined with the US State Jurisdictional boundary file to get relevant attributes. The layer was then transformed from NAD 83 to WGS 84.
This high resolution polygon vector file represents the US Congressional Districts in the United States, as digitized at a 1:500000 scale. The data, current as of 2012, was downloaded from the US Census Bureau TIGER database and processed further by the TTU CGST.
publication date
None
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 is for visual display at appropriate small scales only. Cartographic boundary files should not be used for geographic analysis including area or perimeter calculation. Files should not be used for geocoding addresses. Files should not be used for determining precise geographic area relationships.
Accurate against American National Standards Institute (ANSI) Publication INCITS 446-2008 (Geographic Names Information System (GNIS)) at the 100% level for the codes and base names present in the file. The remaining attribute information has been examined but has not been fully tested for accuracy.
The Census Bureau performed automated tests to ensure logical consistency of the source database. Segments making up the outer and inner boundaries of a polygon tie end-to-end to completely enclose the area. All polygons were 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. Feature attribute information has been examined but has not been fully tested for consistency.
The Cartographic Boundary Files are generalized representations of extracts taken from the MAF/TIGER Database. Generalized boundary files are clipped to a simplified version of the U.S. outline. As a result, some off-shore areas may be excluded from the generalized files. Some small holes or discontiguous parts of areas are not included in generalized files.
All spatial and feature data
Spatial data were extracted from the MAF/TIGER database and processed through a U.S. Census Bureau batch generalization system.
The cartographic boundary polygon shapefiles contain boundary data for a specific type of Census geography. See the U.S. Census Bureau Geographic Terms and Concepts documentation for further explanation of Census geography (http://www.census.gov/geo/www/2010census/GTC_10.pdf).
Below is a list of possible fields. Attribution will vary depending on the type of geography. Field names, descriptions and data types are listed in this format: FIELD_NAME Description [data value or type].
AFFGEOID AFF Summary Level Code, nation identifier; nation FIPS code [string]; AFFGEOID10 2010 Census AFF Summary Level Code, nation identifier; nation FIPS code [string]; ALAND Current land area [number]; ALAND10 2010 Census land area [number]; CD113FP 113th congressional district FIPS code [string]; CDSESSN 113th congressional session code [string]; GEOID identifier, code [string]; GEOID10 2010 Census identifier, 2010 Census code [string]; LSAD Current name and the translated legal/statistical area description code [string]; LSAD10 2010 Census name and the translated legal/statistical area description code [string]; LSY Legislative session year [string]; NAME10 2010 Census name [string]; NAMELSAD Current name and the translated legal/statistical area description [string]; NAMELSAD10 2010 Census name and the translated legal/statistical area description [string]; SLDLST Current state legislative district lower chamber code [string]; SLDUST Current state legislative district upper chamber code [string]; STATEFP Current state FIPS code [string]; UACE10 2010 Census urban area code [string]; UATYP10 2010 Census urban area type [string].
The ALAND or ALAND10 field is the calculated area derived from the ungeneralized area of each entity in square miles. This field can be used in density calculations. Users should not calculate the area of the generalized polygons for use in any analysis. Use the GEOID field to join these spatial tables to 2010 Census data tables if needed.
Some nation-based files may include Puerto Rico and the Island Areas of the United States. Island areas include American Samoa, Guam, the Commonwealth of the Northern Mariana Islands (Northern Mariana Islands), and the United States Virgin Islands.
http://www.census.gov/geo/www/2010census/GTC_10.pdf
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 is for small-scale mapping purposes only; boundary depiction and designation for small-scale mapping purposes do not constitute a determination of jurisdictional authority or rights of ownership or entitlement and they are not legal land descriptions.