Census Designated Places of Loudoun County, VA (2020)

ISO-19139 Metadata

Resource Identification Information:

Citation:

Title: Census Designated Places of Loudoun County, VA (2020)

Reference date - publication: 2012-01-19

Presentation format: mapDigital

Party responsible for the resource - originator:

Organization's name: Loudoun County, VA, Department of Management and Financial Services

Themes or categories of the resource: boundaries

Place keywords:

Keywords: County, Loudoun, Virginia, 51107

Thesaurus name:

Title: none; Employee generated

Place keywords:

Keywords: County, Loudoun, Virginia, 51107

Thesaurus name:

Title: none; Employee generated

Place keywords:

Keywords: County, Loudoun, Virginia, 51107

Thesaurus name:

Title: none; Employee generated

Place keywords:

Keywords: County, Loudoun, Virginia, 51107

Thesaurus name:

Title: none; Employee generated

Theme keywords:

Keywords: Census, American Community Survey, Census Designated Place, CDP, demographic, boundary, boundaries

Thesaurus name:

Title: none; Employee generated

Theme keywords:

Keywords: Census, American Community Survey, Census Designated Place, CDP, demographic, boundary, boundaries

Thesaurus name:

Title: none; Employee generated

Theme keywords:

Keywords: Census, American Community Survey, Census Designated Place, CDP, demographic, boundary, boundaries

Thesaurus name:

Title: none; Employee generated

Theme keywords:

Keywords: Census, American Community Survey, Census Designated Place, CDP, demographic, boundary, boundaries

Thesaurus name:

Title: none; Employee generated

Theme keywords:

Keywords: Census, American Community Survey, Census Designated Place, CDP, demographic, boundary, boundaries

Thesaurus name:

Title: none; Employee generated

Theme keywords:

Keywords: Census, American Community Survey, Census Designated Place, CDP, demographic, boundary, boundaries

Thesaurus name:

Title: none; Employee generated

Theme keywords:

Keywords: Census, American Community Survey, Census Designated Place, CDP, demographic, boundary, boundaries

Thesaurus name:

Title: none; Employee generated

Descriptive keywords:

Keywords: Downloadable Data
Thesaurus name: ArcGIS Content Type

Abstract: This GIS layer contains the geographical boundaries of the 2020 Census Designated Places (CDP) for Loudoun County, Virginia. CDPs are delineated to provide data for concentrations of population in unincorporated communities that are well-known, distinct, closely settled, and identifiable by name and have a mix of residential, commercial, and retail or will soon have a mix. These 2020 CDP boundaries are used for Census Bureau statistical data tabulation purposes, including the 2020 Decennial Census and American Community Survey. There are no population size requirements for CDPs. This 2020 CDP GIS layer's boundaries are based on the U.S. Census Bureau Census 2020 TIGER/Line files. The boundaries are an extract of aerial photography and cartographic information, such as roads and streams, from the Loudoun County GIS system. CDP's are bounded on all sides by visible features, such as roads, streams, lakes, power lines, and railroad tracks, and/or by non-visible boundaries such as town, county, and neighborhood subdivision boundaries, and short line-of-sight extensions of streets and roads.

Purpose: Census Designated Places (CDP) are used in demographic analyses. CDPs are used to gain a detailed picture of population, housing, economic, and other demographic characteristics within unincorporated communities that are well-known, distinct, closely settled, and identifiable by name and have a mix of residential, commercial, and retail or will soon have a mix.

Dataset language: eng

Dataset character set: utf8

Status: completed

Maintenance:

Update frequency: asNeeded

Resource constraints:

Constraints:

Limitations of use: These data were generated for use by Loudoun County and are available to the public. These data are intended for use at 1:2400 scale or smaller. Acknowledgement of Loudoun County would be appreciated in products derived from this data.
Limitations of use: Every reasonable effort has been made to assure the accuracy of these data. Loudoun County, Virginia does not assume any liability arising from the use of these data. These data are provided without warranty of any kind, either expressed or implied, including, but not limited to, the implied warranties of merchantability and fitness for a particular service. Reliance on these data is at the risk of the user.

Spatial representation type: vector

Processing environment: Version 6.2 (Build 9200) ; Esri ArcGIS 10.8.1.14362

Extent:

Geographic element - Bounding rectangle:

Extent contains the resource: true
West longitude: -77.653008
East longitude: -77.326167
North latitude: 39.19163
South latitude: 38.885622

Supplemental information: Loudoun County's Census Designated Places (CDP) were delineated by Loudoun County Government during the Census Bureau's Participant Statistical Areas Program for the 2010 Census. The 2010 Census CDP layer has been modified from the Census Bureau's Tiger line file. Users should be aware that the Census's Tiger line data is devised from a mix of national and local GIS data sets. When the Tiger line data is overlaid with Loudoun County Government's detailed GIS layers it can be determined that the Census Bureau's Tiger line boundaries in some cases are slightly off from the actual location of the physical features, natural features, and governmental units such as town boundaries that they are designated to follow. The 2010 Loudoun CDP layer was generated by Loudoun County so that the CDP boundaries would overlay with the features in Loudoun County's GIS data sets that the boundary are designated to follow. The 2010 CDP boundaries are used for Census Bureau statistical data tabulation purposes, including the 2010 Decennial Census and American Community Surveys. The American Community Survey replaced the long form of the decennial Census. The American Community Survey data sets are released annually. The 2006-2010 through 2016-2020 five-year data sets will all use the 2010 Census block group geographies for statistical tabulation purposes. Data are stored in the corporate ArcSDE Geodatabase as a polygon feature class. The coordinate system is Virginia State Plane (North), Zone 4501, datum NAD83 HARN (vertical datum, if applicable, NAVD88), US Survey foot units.

Point of contact - pointOfContact:

Organization's name: Loudoun County, VA, Department of Management and Financial Services

Contact's position: Demographer

Contact information:

Phone:

Voice: (703) 777-0563

Address:

Delivery point: MS 61
Delivery point: 1 Harrison St, SE
Delivery point: MS 41
City: Leesburg
Administrative area: VA
Postal code: 20175
Country: US

Hours of service: 8:30-5:00 EST, M-F

Spatial Representation - Vector:

Level of topology for this dataset: geometryOnly

Geometric objects:

Object type: composite
Object count: 23

Spatial Representation - Vector:

Level of topology for this dataset: geometryOnly

Geometric objects:

Object type: composite
Object count: 23

Reference System Information:

Reference system identifier:

Value: 2924
Code space: EPSG
Version: 8.9.3(9.0.0)

Data Quality Information:

Scope of quality information:

Level of the data:dataset

Lineage:

Process step:

When the process occurred: 2011-01-01T00:00:00

Description: A CDP consists of a group of census blocks. Census block and Census Designated Place (CDP) shapefile downloaded from the U.S. Census Bureau. Overlaid the Census Bureau shapefiles with with Loudoun County Government's detailed GIS layers to determine the actual location of the physical features, natural features, and governmental units such as town boundaries that the census blocks and CDP are designated to follow. Digitized block lines using Loudoun County Government's detailed GIS layers. A CDP was assigned to each census block. Created the Census Designated layer by spatially dissolving the census block layer.

Process contact - processor:

Organization's name: Loudoun County, VA Office of Mapping and Geographic Information
Contact's position: Land Records Staff

Source data:

Level of the source data: Loudoun County Government GIS provided base layer for digitizing block boundaries

Source citation:

Title: Loudoun County GIS data

Source data:

Level of the source data: U.S. Census Bureau, 2010 Decennial Census summary file provided demographic data

Source citation:

Title: 2010 Decennial Census summary file
Reference date - publication: 2010-04-01

Source data:

Level of the source data: TIGER/Line files provided the foundation upon which census blocks were drawn. The 2010 Census blocks were the basis for devising the election district boundaries.

Source citation:

Title: ESRI Tiger data
Reference date - publication: 2010-01-04

Data quality report - Completeness omission:

Evaluation method: Features may have been eliminated or generalized due to scale and intended use. To assist Loudoun County, Virginia in the maintenance of the data, please provide any information concerning discovered errors, omissions, or other discrepancies found in the data.

Data quality report - Conceptual consistency:

Measure description: Topologically clean

Data quality report - Completeness omission:

Measure description: Features may have been eliminated or generalized due to scale and intended use. To assist Loudoun County, Virginia in the maintenance of the data, please provide any information concerning discovered errors, omissions, or other discrepancies found in the data.

Data quality report - Quantitative attribute accuracy:

Measure description: Retention of attribute accuracy throughout the personal geodatabase or shapefile to ArcSDE geodatabase feature class coversion process was ensured by a manual or automatic QA/QC programmatic check. To meet satisfactory QA/QC requirements the input coverage and output feature class must have, on a record by record basis, identical attribution when comparing all concatenated fields to all the user-defined attribution.

Data quality report - Absolute external positional accuracy:

Measure description: Retention of coordinate accuracy throughout the personal geodatabase or shapefile to ArcSDE geodatabase feature class conversion process was ensured by a manual or automatic QA/QC programmatic check. To meet satisfactory QA/QC requirements the input coverage and output feature class must have the same record total, and on a record by record basis, area, perimeter, and length differential of less than +/- 0.5%.

Distribution Information:

Distributor:

Distributor information - distributor:

Organization's name: Loudoun County, VA OMAGI

Contact's position: Public Information Counter

Contact information:

Phone:

Voice: (703)771-5778
Fax: (703)771-5075

Address:

Delivery point: MS 65
Delivery point: 1 Harrison Street S.E., 2nd floor
City: Leesburg
Administrative area: VA
Postal code: 20175
Country: US
e-mail address: mapping@loudoun.gov

Hours of service: 8:00-4:30 EST, M-F

Format:

Format name: DXF
Format specification: AutoCad Digital Exchange File

Format:

Format name: GDB
Format specification: ESRI Personal Geodatabase Feature Class

Format:

Format name: SHP
Format specification: ESRI Shapefile

Ordering process:

Terms and fees: Loudoun County distributes spatial data in ArcGIS database or shapefile & DXF format for the cost of reproduction. Countywide spatial datasets may be purchased for $22 per DVD for up to 4.5 GB of data. There is a $100 surcharge to purchase countywide topography, and a $3 charge if the item is to be mailed. If the customer wants the data in DXF format and/or would like OMAGI to custom select specific geographic areas of the County, there is an additional $7 per 15 minute increment labor charge. Select aerial imagery is also available.
Turnaround time: Size limit: 4.5 GB. Visit our website at: http://www.loudoun.gov/omagi, click on "Loudoun County Mapping Documents & Order Forms." The "Forms" directory will lead you to custom & standard (countywide) data order forms. Hardcopy maps may also be available; please contact the Mapping Office Public Information Counter for more information regarding all data requests.

Transfer options:

Units of distribution (e.g., tiles): Tiles

Medium of distribution:

Medium name: dvd

Format:

Format name: File Geodatabase Feature Class

Metadata Information:

Metadata language: eng

Metadata character set: utf8

Last update: 2021-08-12

Maintenance:

Update frequency: irregular

Metadata constraints:

Constraints:

Limitations of use: This metadata reflects the source Geodatabase format and specific elements may not apply if your data is exported to SHP or DXF products. User must be aware that changes to data schema occur during data export that may not be reflected in this metadata, which represents Loudoun County's corporate geodatabase. Acknowledgement of Loudoun County would be appreciated in the use of this metadata.

Metadata contact - pointOfContact:

Organization's name: Loudoun County, VA, OMAGI

Contact's position: Metadata Specialist

Contact information:

Phone:

Voice: (703)771-5778
Fax: (703)771-5075

Address:

Delivery point: MS 65
Delivery point: 1 Harrison Street SE, 2nd Floor
City: Leesburg
Administrative area: VA
Postal code: 20175
Country: US
e-mail address: mapping@loudoun.gov

Hours of service: 8:00-4:30 EST, M-F

Scope of the data described by the metadata: dataset

Scope name: dataset

Name of the metadata standard used: ISO 19139 Geographic Information - Metadata - Implementation Specification

Version of the metadata standard: 2007