View Metadata
Census Block Groups - City of Newton
- Identification Information
- Data Quality Information
- Spatial Data Organization Information
- Spatial Reference Information
- Entity and Attribute Information
- Distribution Information
- Metadata Reference Information
- Identification Information
- Citation
- Originator
- City of Newton GIS
- Publication Date
- 2001?
- Title
- Census Block Groups - City of Newton
- Geospatial Data Presentation Form
- vector digital data
- Online Linkage
- https://hgl.harvard.edu/catalog/harvard-nwtnblkgrppy
- Abstract
- A polygon coverage of the boundaries of the U.S. Census Bureau's block groups and some appended demographic information for Newton, Massachusetts. Currently the most recent information is for the 1990 census. A census Block Group is a statistical subdivision of a census Tract consisting of a cluster of census blocks having the same first digit of their identifying numbers within that tract. Example, Block Group 3 contains all blocks from 3000-3999.
- Purpose
- This layer is intended for researchers, students, and policy makers for reference and mapping purposes, and may be used for basic applications such as viewing, querying, and map output production. This layer will provide a basemap for layers related to demographics or population studies or to support graphical overlays and analysis with other spatial data. More advanced user applications may focus on urban and regional planning, demographic or socio-economic studies (including defining boundaries, managing assets and facilities, integrating attribute databases with geographic features, spatial analysis, and presentation output. Block Groups generally contain between 300 and 3,000 people with an optimum size of 1,500 people. The Block Group is the lowest-level geographic entity for which the U.S. Census Bureau tabulates "Sample" data from a decennial census. The Census Bureau's TIGER (Topographically Integrated Geographic Encoding and Referencing) System automates the mapping and related geographic activities required to support the decennial census and sample survey programs of the Census Bureau.
- Supplemental Information
- The City of Newton is not maintaining this layer but when the 2000 Information becomes available it will be added and the 1990 data will be archived for historic purposes.
- Temporal Extent
- Currentness Reference
- ground condition
- Time Instant
- 1990
- Bounding Box
- West
- -71.270375
- East
- -71.156794
- North
- 42.367871
- South
- 42.282602
- ISO Topic Category
- boundaries
- society
- Theme Keyword
- Municipal
- Theme Keyword Thesaurus
- HGL Category Keyword Thesaurus
- Theme Keyword
- Census
- Population
- Demographic surveys
- Households
- Theme Keyword Thesaurus
- LCSH
- Place Keyword
- Newton
- Massachusetts
- Place Keyword Thesaurus
- GNIS
- Temporal Keyword
- Access Restrictions
- Access is granted to licensee (Harvard University) only. Available only to Harvard University affiliates.
- Use Restrictions
- For educational or non-commercial use only.
- Status
- Complete
- Maintenance and Update Frequency
- As needed
- Point of Contact
- Contact Organization
- City of Newton GIS
- Delivery Point
- Information Technology Department
- Delivery Point
- City Hall, Room 107
- Delivery Point
- 1000 Commonwealth Avenue
- City
- Newton Center
- State
- MA
- Postal Code
- 02459-1400
- Country
- USA
- Contact Telephone
- 617-796-1180
- Contact Telephone
- 617-796-1000
- Credit
- GIS data supplied by City of Newton GIS.
- Native Data Set Environment
- Microsoft Windows NT Version 4.0 (Build 1381) Service Pack 6; ESRI ArcCatalog 8.2.0.700
- Data Quality Information
- Logical Consistency Report
- For layers containing line or polygon features, Newton's data layers are "topologically clean". This was verified with Arc/Info software version 7.x in 1998 and is an ongoing part of data maintenance for the relevant data layers.
- Horizontal Positional Accuracy Report
- No systematic and quantitative review of property boundary accuracy has ever been conducted. However, several qualitative observations based on experience using the data are possible. The street right-of-way lines overlay the orthophoto base map very well, falling on or close to the apparent back-of-sidewalk visible on the photos.The edge-of-pavement data layer was compiled from aerial photography for Boston Edison to an absolute accuracy specification of +/- 2.5 feet. Again, the right-of-way lines match up well in this comparison. Less is known about the accuracy of the internal property boundaries. Casual observations suggest they are sometimes as accurate as the right-of-way lines and sometimes much less. Some observations of boundary line discrepancies relative to property boundary lines such as fences and hedges visible on the orthophotos indicate that internal property boundaries may be off by at least +/- 5 feet.
- Lineage
- Source
- Originator
- U.S. Department of Commerce, Bureau of the Census, Geography Division
- Publication Date
- Unpublished Material
- Title
- TIGER data base
- Edition
- 1990
- Type of Source Media
- online
- Source Temporal Extent
- Time Period Information
- Single Date/Time
- Calendar Date
- 1990
- Source Currentness Reference
- ground condition
- Contribution
- Selected cartographic and demographic information (line segments) from the Census TIGER data base.
- Spatial Data Organization Information
- Direct Spatial Reference Method
- Vector
- Point and Vector Object Information
- SDTS Terms Description
- SDTS Point and Vector Object Type
- G-polygon
- Point and Vector Object Count
- 1343
- Spatial Reference Information
- Horizontal Coordinate System Definition
- Planar
- Grid Coordinate System
- Grid Coordinate System Name
- State Plane Coordinate System
- State Plane Coordinate System
- SPCS Zone Identifier
- 2001
- Lambert Conformal Conic
- Planar Coordinate Information
- Planar Coordinate Encoding Method
- coordinate pair
- Coordinate Representation
- Abscissa Resolution
- 0.000015
- Ordinate Resolution
- 0.000015
- Planar Distance Units
- survey feet
- Geodetic Model
- Horizontal Datum Name
- North American Datum of 1983
- Ellipsoid Name
- Geodetic Reference System 80
- Semi-major Axis
- 6378137.000000
- Denominator of Flattening Ratio
- 298.257222
- Vertical Coordinate System Definition
- Altitude System Definition
- Altitude Datum Name
- National Geodetic Vertical Datum of 1929
- Altitude Resolution
- 1.000000
- Altitude Encoding Method
- Explicit elevation coordinate included with horizontal coordinates
- Entity and Attribute Information
- Entity Type
- Entity Type Label
- Census Block Groups
- Entity Type Definition
- ESRI Shapefile. Polygons represent census block groups
- Entity Type Definition Source
- ESRI
- Attributes
- FEATURE AREA
- Internally calculated feature area in map units
- Definition Source
- ESRI
- PERIMETER
- Internally calculated feature perimeter in map units
- BLK207_
- Internal Feature Identifier
- Definition Source
- ESRI
- BLK207_ID
- Internal Feature Identifier
- Definition Source
- ESRI
- COUNTY
- County FIPS Code (Federal Information Processing StandardsNational Institute of Standards and Technology)
- Definition Source
- Department of Commerce, Census Bureau
- TRACT90
- 1990 Census Tract (Federal Information Processing StandardsNational Institute of Standards and Technology)
- Definition Source
- Department of Commerce, National Institute of Standards and Technolog
- BLOCK90
- 1990 Census Block Group
- Definition Source
- Department of Commerce, Census Bureau
- CNT_TRCT_B
- Numeric code combining County, Tract, Block digits
- Definition Source
- Department of Commerce, Census Bureau
- DATA
- POP18
- Population aged 18 and over (Populations for the features)
- Definition Source
- Department of Commerce, Census Bureau
- POPUNDER18
- Population under age 18 (Populations for the features)
- Definition Source
- Department of Commerce, Census Bureau
- DENSITY
- CNTTRCTBLK
- BLOCKGRP
- 1990 Census Block Group (Federal Information Processing StandardsNational Institute of Standards and Technology)
- Definition Source
- Department of Commerce, Census Bureau
- TRCTBLK
- Numeric code for Tract and Block (Federal Information Processing StandardsNational Institute of Standards and Technology)
- Definition Source
- Department of Commerce, Census Bureau
- TRACTSUFF
- FILL
- CONGDIS
- Congressional Districts
- Definition Source
- Department of Commerce, Census Bureau
- HOUSE100
- Number of Households (Populations for the features)
- Definition Source
- Department of Commerce, Census Bureau
- POP100
- 100 Percent Count of Persons (Populations for the features)
- Definition Source
- Department of Commerce, Census Bureau
- POPHISP
- Hispanic Population (Populations for the features)
- Definition Source
- Department of Commerce, Census Bureau
- POPWHITE
- Caucasian (White) Population (Populations for the features)
- Definition Source
- Department of Commerce, Census Bureau
- POPBLACK
- African-American (Black) Population (Populations for the features)
- Definition Source
- Department of Commerce, Census Bureau
- POPNATAM
- Native-American Population (Populations for the features)
- Definition Source
- Department of Commerce, Census Bureau
- POPASIAN
- Asian-American Population (Populations for the features)
- Definition Source
- Department of Commerce, Census Bureau
- POPOTHER
- Population classified as "Other Races" (Populations for the features)
- Definition Source
- Department of Commerce, Census Bureau
- POP18HISP
- Over 18 Hispanic (Populations for the features)
- Definition Source
- Department of Commerce, Census Bureau
- POP18WHITE
- Over 18 Caucasian (Populations for the features)
- Definition Source
- Department of Commerce, Census Bureau
- POP18BLACK
- Over 18 African-American (Black) (Populations for the features)
- Definition Source
- Department of Commerce, Census Bureau
- POP18NATAM
- Over 18 Native American (Populations for the features)
- Definition Source
- Department of Commerce, Census Bureau
- POP18ASIAN
- Over 18 Asian (Populations for the features)
- Definition Source
- Department of Commerce, Census Bureau
- POP18OTHER
- Over 18 Other (Populations for the features)
- Definition Source
- Department of Commerce, Census Bureau
- NAME
- Block Name
- Definition Source
- Department of Commerce, Census Bureau
- PLACECE
- FPLACE90
- Numeric Place Code (Federal Information Processing StandardsNational Institute of Standards and Technology)
- Definition Source
- Department of Commerce, National Institute of Standards and Technolog
- COUSUBFP
- SUMLEV
- NWTNBLKGRPPY.FID
- Internal feature number. (Sequential unique whole numbers that are automatically generated.)
- Definition Source
- ESRI
- SHAPE
- Feature geometry. (Coordinates defining the features.)
- Definition Source
- ESRI
- SHAPE.AREA
- Internally calculated feature area in map units
- Definition Source
- ESRI
- SHAPE.LEN
- Internally calculated feature length in map units
- Definition Source
- ESRI
- Distribution Information
- Format Name
- Shape
- Distributor
- Harvard Geospatial Library
- Name
- Metadata Reference Information
- Metadata Date
- 20021017
- Metadata Contact
- Contact Information
- Contact Organization Primary
- Contact Organization
- Harvard Geospatial Library
- Contact Person
- Geospatial Resources Cataloger
- Contact Address
- Address
- Office of Information Systems
- Address
- 1280 Massachusetts Avenue
- City
- Cambridge
- State or Province
- MA
- Postal Code
- 02138
- Country
- USA
- Contact Voice Telephone
- 617-295-12417
- Contact Facsimile Telephone
- 617-496-0440
- Contact Electronic Mail Address
- hgl_ref@hulmail.harvard.edu
- Metadata Standard Name
- FGDC Content Standards for Digital Geospatial Metadata
- Metadata Standard Version
- FGDC-STD-001-1998
- Metadata Extensions
- Online Linkage
- http://www.esri.com/metadata/esriprof80.html
- Profile Name
- ESRI Metadata Profile
