2017 Cartographic Boundary File, Current Block Group for Minnesota, 1:500,000

This page last updated: 03/2018
Metadata created using Content Standard for Digital Geospatial Metadata


Go to Section:
1. Overview
2. Data Quality
3. Data Organization
4. Coordinate System
5. Attributes
6. Distribution - Get Data
7. Metadata Reference

Section 1 Overview
Originator U.S. Department of Commerce, U.S. Census Bureau, Geography Division, Cartographic Products and Services Branch
Title 2017 Cartographic Boundary File, Current Block Group for Minnesota, 1:500,000
Abstract The 2017 cartographic boundary shapefiles are simplified representations of selected geographic areas from the U.S. Census Bureau's Master Address File / Topologically Integrated Geographic Encoding and Referencing (MAF/TIGER) Database (MTDB). 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 files while others are available only as state-based files.

Block Groups (BGs) are clusters of blocks within the same census tract. Each census tract contains at least one BG, and BGs are uniquely numbered within census tracts. BGs have a valid code range of 0 through 9. BGs have the same first digit of their 4-digit census block number from the same decennial census. For example, tabulation blocks numbered 3001, 3002, 3003,.., 3999 within census tract 1210.02 are also within BG 3 within that census tract. BGs coded 0 are intended to only include water area, no land area, and they are generally in territorial seas, coastal water, and Great Lakes water areas. Block groups generally contain between 600 and 3,000 people. A BG usually covers a contiguous area but never crosses county or census tract boundaries. They may, however, cross the boundaries of other geographic entities like county subdivisions, places, urban areas, voting districts, congressional districts, and American Indian / Alaska Native / Native Hawaiian areas.

The generalized BG boundaries in this release are based on those that were delineated as part of the Census Bureau's Participant Statistical Areas Program (PSAP) for the 2010 Census.
Purpose These files were specifically created to support small-scale thematic mapping. To improve the appearance of shapes at small scales, areas are represented with fewer vertices than detailed TIGER/Line Shapefiles. Cartographic boundary files take up less disk space than their ungeneralized counterparts. Cartographic boundary files take less time to render on screen than TIGER/Line Shapefiles. You can join this file with table data downloaded from American FactFinder by using the AFFGEOID field in the cartographic boundary file. If detailed boundaries are required, please use the TIGER/Line Shapefiles instead of the generalized cartographic boundary files.
Time Period of Content Date
Currentness Reference publication date
Progress Complete
Maintenance and Update Frequency None planned. No changes or updates will be made to this version of the cartographic boundary files. New versions of the cartographic boundary files will be produced on an annual release schedule. Types of geography released may vary from year to year.
Spatial Extent of Data
Bounding Coordinates -97.239209
-89.491739
49.384358
43.499356
Place Keywords Minnesota
Theme Keywords Boundaries
Theme Keyword Thesaurus ISO 19115 Topic Categories
Access Constraints None
Use Constraints The intended display scale for this file is 1:500,000. This file should not be displayed at scales larger than 1:500,000.

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.
Contact Person Information ,

4600 Silver Hill Road
Washington, DC  20233-7400
Phone: 301.763.1128
Fax: 301.763.4710
Email: geo.geography@census.gov
Browse Graphic None available
Associated Data Sets

Section 2 Data Quality
Attribute Accuracy 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.
Logical Consistency 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 INCITS (formerly 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.

For the cartographic boundary files, the Point and Vector Object Count for the G-polygon SDTS Point and Vector Object Type reflects the number of records in the file's data 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. Cartographic Boundary File multi-polygons are an exception to the G-polygon object type classification. Therefore, when multi-polygons exist in a file, the object count will be less than the actual number of G-polygons.
Completeness 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 geographic areas, holes, or discontiguous parts of areas may not be included in generalized files if they are not visible at the target scale.
Horizontal Positional Accuracy Data are not accurate. Data are generalized representations of geographic boundaries at 1:500,000.
Lineage Spatial data were extracted from the MAF/TIGER database and processed through a U.S. Census Bureau batch generalization system.

Section 3 Spatial Data Organization (not used in this metadata)

Section 4 Coordinate System
Horizontal Coordinate Scheme
Horizontal Datum North American Datum of 1983
Horizontal Units

Section 5 Attributes
Overview
Detailed Citation
Table Detail:
cb_2017_27_bg_500k.shp - Current Block Group (state-based) (U.S. Census Bureau)
Field NameValid ValuesDefinitionDefinition Source
STATEFP
-
Current state Federal Information Processing Series (FIPS) codeU.S. Census Bureau
COUNTYFP
-
Current county Federal Information Processing Series (FIPS) codeU.S. Census Bureau
TRACTCEenumeratedCurrent census tract codeU.S. Census Bureau
000000Water tract in some coastal and Great Lakes water and territorial seaU.S. Census Bureau
000100 to 998999Census tract numberU.S. Census Bureau
BLKGRPCE0 to 9Current block group number. A block group number of 0 represents a water block group.U.S. Census Bureau
AFFGEOID
-
American FactFinder summary level code + geovariant code + '00US' + GEOIDU.S. Census Bureau
GEOID
-
Census block group identifier; a concatenation of the current state Federal Information Processing Series (FIPS) code, county FIPS code, census tract code, and block group numberU.S. Census Bureau
NAME
-
Current block group number. A block group number of 0 represents a water block group.U.S. Census Bureau
LSADenumeratedCurrent legal/statistical area description code for Census block groupU.S. Census Bureau
BGBlock Group (prefix)U.S. Census Bureau
ALAND0 to 9,999,999,999,999Current land area (square meters)U.S. Census Bureau
AWATER0 to 9,999,999,999,999Current water area (square meters)U.S. Census Bureau


Section 6 Distribution
Publisher
Publication Date 03/2018
Contact Person Information ,

4600 Silver Hill Road
Washington, DC  20233-7400
Phone: 301.763.1128
Fax: 301.763.4710
Email: geo.geography@census.gov
Distributor's Data Set Identifier
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 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.
Ordering Instructions To obtain more information about ordering Cartographic Boundary Files visit https://www.census.gov/geo/www/tiger.
Online Linkage I AGREE to the notice in "Distribution Liability" above. Clicking to agree will either begin the download process, link to a service, or provide more instructions. See "Ordering Instructions" above for details.

Section 7 Metadata Reference
Metadata Date 03/2018
Contact Person Information ,

4600 Silver Hill Road
Washington, DC  20233-7400
Phone: 301.763.1128
Fax: 301.763.4710
Email: geo.geography@census.gov
Metadata Standard Name Content Standard for Digital Geospatial Metadata
Metadata Standard Version FGDC-STD-001-1998
Metadata Standard Online Linkage


This page last updated: 03/2018
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