Keywords
Theme:
society, boundaries, block group, census, bureau
Place:
Delaware County, Ohio
Description
Abstract
Census Block Groups is a polygon shapefile of Census Blocks Groups in Delaware County, which was created and conflated by the US Census Bureau to Delaware County's road centerlines and political boundaries.
Purpose
Census block groups are areas broken down by the US Census Bureau to aid in conducting the decenial census.
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Status of the data
Complete
Data update frequency:
Every ten years
Time period for which the data is relevant
Description:
None Planned
Publication Information
Who created the data: US Census Bureau and Delaware Appraisal Land Information System (DALIS)
Date and time:
20000401
Publisher and place:
Delaware County Auditor, Delaware, Ohio
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Data storage and access information
File name: block_group
Type of data: vector digital data
Location of the data:
http://www.dalisproject.org
Data processing environment: Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.1.0.722
Accessing the data
Data format: shapefile
Size of the data: 0.129 MB
Data transfer size: 0.129 MB
Constraints on accessing and using the data
Access constraints:
It is strongly recommended that this data is directly required from the distributor above and not indirectly through other sources which may have changed the data in some way. The distributor makes no claims as to the data's suitablity for other purposes. This is a draft copy of the Block Group boundaries. A new version will be added to the website when we recieve it from the US Census Bureau.
Use constraints:
Information contained within this data set may be used to generally locate, identify, and inventory census block groups and related layers in Delaware County. There are inherent errors and limitations associated with this type of information. In no way shall Delaware County or its service provider be liable for damages that may arise from the use of this data set or the information that is contained within including, but not limited to loss of data, loss of profits, business or other percuniary loss.
Details about this document
Contents last updated: 20070622
at time 08511100
Who completed this document
DALIS Staff
Delaware Appraisal Land Information System (DALIS) Project
mailing and physical address:
740-833-2070 (voice)
740-833-2069 (fax)
dalis@co.delaware.oh.us
Hours of service:
8AM - 5PM Monday thru Friday
Standards used to create this document
Standard name: FGDC Content Standards for Digital Geospatial Metadata
Standard version: FGDC-STD-001-1998
Time convention used in this document: local time
Metadata profiles defining additonal information
ESRI Metadata Profile: http://www.esri.com/metadata/esriprof80.html
Horizontal coordinate system
Projected coordinate system name: NAD_1983_StatePlane_Ohio_North_FIPS_3401_Feet
Geographic coordinate system name: GCS_North_American_1983
Details
Grid Coordinate System Name: Universal Transverse Mercator
Planar Coordinate Information
Planar Distance Units: survey feet
Coordinate Encoding Method: coordinate pair
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
Altitude System Definition
Datum Name: North American Vertical Datum of 1988
Resolution: First order coordinates
Distance Units: feet
Encoding Method: Implicit coordinate
Depth System Definition
Datum Name: Mean sea level
Distance Units: feet
Encoding Method: Implicit coordinate
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Bounding coordinates
Horizontal
In decimal degrees
West:
-83.251347
East:
-82.744110
North:
40.446171
South:
40.123818
In projected or local coordinates
Left: 1759372.767571
Right: 1900237.345324
Top: 284090.387952
Bottom: 167451.795430
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Lineage
FGDC lineage
Process step 1
Process description: US Census Burearu has conflated their data using Delaware County's road centerline and political boundaries to match the boundaries for the census blocks. Attributes were assigned by the U S Census Bureau. The data is a draft copy and was completed by April 1, 2000. A new version will be available as soon as we receive it from the Burearu.
Who did this process
DALIS Staff
Delaware Appraisal Land Information System (DALIS) Project
mailing and physical address:
740-833-2070 (voice)
740-833-2069 (fax)
dalis@co.delaware.oh.us
Hours of service:
8AM - 5PM Monday thru Friday
Sources
Source 1:
Census Block Groups
Media: online
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Spatial data quality
Horizontal positional accuracy
The horizontal position accuracy is tested by the visual comparison of other layers against the actual data recieved from the US Census Bureau. This a draft copy. A new version will be adopted when we receive it from the U S Census Burearu.
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Spatial data description
Vector data information
ESRI description
block_group
ESRI feature type: Simple
Geometry type: Polygon
Topology: FALSE
Feature count: 71
Spatial Index: TRUE
Linear referencing: FALSE
SDTS description
Feature class: SDTS feature type, feature count
block_group:
G-polygon, 71