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Census Block Groups (500k Carto Boundary File), WI 2018
- Identification Information
- Spatial Reference Information
- Data Quality Information
- Distribution Information
- Spatial Representation Information
- Metadata Reference Information
Identification Information
- Citation
- Title
- Census Block Groups (500k Carto Boundary File), WI 2018
- Originator
- U.S. Census Bureau
- Publication Date
- 2020-04-27
- Edition
- 2018
- Geospatial Data Presentation Form
- mapDigital
- Collection Title
- Statewide
- Abstract
- This data represents Block Groups from the U.S. Census Bureau for Wisconsin in 2018. [The 2018 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
- This data is intended for reference and mapping purposes, and may be used for basic applications such as viewing, querying, and map output production, or to provide a basemap to support graphical overlays and analysis with other spatial data. [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.]
- Supplemental Information
- This is an archived copy of the data held at UW-Madison.
- Temporal Extent
- Time Instant
- 2018-01-01T00:00:00
- Bounding Box
- West
- -92.888114
- East
- -86.805415
- North
- 47.080621
- South
- 42.491983
- ISO Topic Category
- boundaries
- Place Keyword
-
Wisconsin
- Place Keyword Thesaurus
- Theme Keyword
-
Census districts
- Theme Keyword Thesaurus
- LCSH
- Legal Constraints
- Use Limitation
- Although this data is being distributed by the University of Wisconsin-Madison, no warranty expressed or implied is made by the University as to the accuracy of the data and related materials. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the University in the use of this data, or related materials.
- Status
- completed
- Maintenance and Update Frequency
- unknown
- Language
- eng
- Credit
- U.S. Census Bureau
- Point of Contact
- Contact
- U.S. Census Bureau
Spatial Reference Information
- Reference System Identifier
- Code
- 4269
- Code Space
- EPSG
- Version
- 9.7
Data Quality Information
- Lineage
- Process Step
- Description
- Process Description: Provided access to archived data at UW-Madison.
- Process Date
- 2020-04-27T00:00:00
Distribution Information
- Format Name
- Shapefile
- Format Version
- 1.0
- Distributor
- University of Wisconsin-Madison
- Distributor
- U.S. Census Bureau
- Online Access
- https://gisdata.wisc.edu/public/WI_CensusCBF_BlockGroups_2018.zip
- Protocol
- WWW:DOWNLOAD-1.0-http--download
- Name
- GeoData@Wisconsin
- Function
- download
Spatial Representation Information
- Vector
- Topology Level
- geometryOnly
- Vector Object Type
- composite
- Vector Object Count
- 4476
Metadata Reference Information
- Hierarchy Level
- dataset
- Metadata File Identifier
- 3DD879CB-3872-4858-BDDB-75E2C06957C8
- Metadata Point of Contact
- Name
- Arthur H. Robinson Map Library
- Position Name
- Metadata technician
- Delivery Point
- 550 N. Park Street
- City
- Madison
- Administrative Area
- WI
- Postal Code
- 53706
- Country
- US
- askmap@library.wisc.edu
- Phone
- (608) 262-1471
- Metadata Date Stamp
- 2020-05-04
- Metadata Standard Name
- ISO 19139 Geographic Information - Metadata - Implementation Specification
- Metadata Standard Version
- 2007
- Character Set
- utf8
