Election Precincts of Loudoun County, VA (2015)
Metadata also available as
Metadata:
- Identification_Information:
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- Citation:
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- Citation_Information:
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- Originator:
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Loudoun County, VA, Office of Mapping & Geographic Information (OMAGI)
- Publication_Date: 20130729
- Title: Election Precincts of Loudoun County, VA (2015)
- Geospatial_Data_Presentation_Form: vector digital data
- Description:
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- Abstract:
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This file contains the voting precincts. These precinct boundaries were last reviewed, updated, and adopted by the Board of Supervisors on July 5, 2015. Precincts are wholly contained within the Loudoun Board of Supervisors' election districts. The first digit of the three digit PR_Number (precinct number) identifies the precinct's local BOS election district.The newly created precincts from BoS approved splits currently contain no Census values and will be updated once those figures are calculated.
- Purpose:
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Voting districts are established by the Loudoun County Board of Supervisors and Electoral Board for the purpose of conducting elections.
- Supplemental_Information:
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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.
- Status:
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- Progress: Complete
- Maintenance_and_Update_Frequency: As needed
- Spatial_Domain:
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- Bounding_Coordinates:
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- West_Bounding_Coordinate: -77.963439
- East_Bounding_Coordinate: -77.323973
- North_Bounding_Coordinate: 39.326230
- South_Bounding_Coordinate: 38.844263
- Keywords:
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- Theme:
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- Theme_Keyword_Thesaurus: none; Employee generated
- Theme_Keyword: election
- Theme_Keyword: voting
- Theme_Keyword: district
- Theme_Keyword: precinct
- Theme:
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- Theme_Keyword_Thesaurus: ISO 19115 Topic Categories
- Theme_Keyword: location
- Theme_Keyword: society
- Place:
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- Place_Keyword_Thesaurus: none; Employee generated
- Place_Keyword: Virginia
- Place_Keyword: County
- Place_Keyword: 51107
- Place_Keyword: Loudoun
- Access_Constraints: None
- Use_Constraints:
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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.
- Point_of_Contact:
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- Contact_Information:
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- Contact_Organization_Primary:
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- Contact_Organization:
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Loudoun County, VA, Department of Management and Financial Services
- Contact_Position: Demographer
- Contact_Address:
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- Address_Type: mailing and physical
- Address: MS 41
- Address: 1 Harrison St
- City: Leesburg
- State_or_Province: VA
- Postal_Code: 20175
- Country: US
- Contact_Voice_Telephone: (703) 777-0563
- Hours_of_Service: 8:30-5:00 EST, M-F
- Native_Data_Set_Environment: Version 6.2 (Build 9200) ; Esri ArcGIS 10.2.2.3552
- Data_Quality_Information:
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- Attribute_Accuracy:
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- Attribute_Accuracy_Report:
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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.
- Logical_Consistency_Report: Topologically clean
- Completeness_Report:
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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.
- Positional_Accuracy:
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- Horizontal_Positional_Accuracy:
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- Horizontal_Positional_Accuracy_Report:
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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%.
- Lineage:
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- Source_Information:
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- Source_Citation:
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- Citation_Information:
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- Title: Loudoun County GIS
- Type_of_Source_Media: None
- Source_Citation_Abbreviation: Loudoun County GIS
- Source_Contribution:
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Loudoun County Government GIS layers for Census Block & precinct line "adjustments"
- Source_Information:
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- Source_Citation:
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- Citation_Information:
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- Originator: Loudoun County, VA
- Publication_Date: 20120102
- Type_of_Source_Media: hardcopy
- Source_Contribution:
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Loudoun County Department of Management and Financial Services is the source for population, housing units, household estimates.
- Source_Information:
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- Source_Citation:
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- Citation_Information:
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- Originator: ESRI
- Publication_Date: 20100111
- Title: ESRI Tiger data
- Type_of_Source_Media: None
- Source_Citation_Abbreviation: ESRI Tiger data
- Source_Contribution:
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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_Information:
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- Source_Citation:
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- Citation_Information:
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- Originator: U.S. Census Bureau
- Publication_Date: 20100401
- Title: 2010 Census SF1 block data
- Type_of_Source_Media: onLine
- Source_Citation_Abbreviation: 2010 Census SF1 block data
- Source_Contribution:
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The 2010 Census SF1 block data were the basis for deriving the demographic data.
- Process_Step:
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- Process_Description:
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The precinct layer has the potential to be updated on a yearly basis as the County's population growth dictates. As precincts exceed their designated population amount, precincts are either split or merged with existing precincts.
- Process_Step:
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- Process_Description:
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The precinct boundaries are designated to follow physical features, natural features, and governmental units such as town boundaries. Census blocks are designated to follow these types of features as well. Census block shapefiles were downloaded from the U.S. Census Bureau. Overlaid the Census Bureau block shapefile 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 are designated to follow. Digitized block lines using Loudoun County Government's detailed GIS layers. Precinct boundaries that do not follow block boundaries were identified. The identified boundaries were digitized using Loudoun County Government's detailed GIS layers, and in doing so, census blocks were split into parts. Created the precinct layer by assigning the precinct name to each census block or census block split area and then spatially dissolving the census block with splits layer. The population, household, and housing unit totals were derived by summing U.S. Census Bureau 2010 Census block and census block split area totals. For split census blocks, the percentage of a blocks housing units that existed for the 2010 Census in the split area was determined using a combination of building permit, occupancy permit, and assessment data. This calculated percentage for a census block's split area was then multiplied by the population, household, and housing unit totals of the census block to derive the estimated population, household, and housing unit totals for the block split area.
- Process_Date: 20120109
- Process_Contact:
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- Contact_Information:
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- Contact_Organization_Primary:
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- Contact_Organization: Loudoun County Department of Management and Financial Services
- Contact_Position: Demographer
- Spatial_Data_Organization_Information:
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- Indirect_Spatial_Reference: Loudoun County
- Direct_Spatial_Reference_Method: Vector
- Point_and_Vector_Object_Information:
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- SDTS_Terms_Description:
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- SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains
- Point_and_Vector_Object_Count: 93
- Spatial_Reference_Information:
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- Horizontal_Coordinate_System_Definition:
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- Planar:
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- Map_Projection:
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- Map_Projection_Name: NAD 1983 HARN StatePlane Virginia North FIPS 4501 Feet
- Lambert_Conformal_Conic:
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- Standard_Parallel: 38.03333333333333
- Standard_Parallel: 39.2
- Longitude_of_Central_Meridian: -78.5
- Latitude_of_Projection_Origin: 37.66666666666666
- False_Easting: 11482916.66666666
- False_Northing: 6561666.666666666
- Planar_Coordinate_Information:
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- Planar_Coordinate_Encoding_Method: coordinate pair
- Coordinate_Representation:
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- Abscissa_Resolution: 0.00020833333333333297
- Ordinate_Resolution: 0.00020833333333333297
- Planar_Distance_Units: foot_us
- Geodetic_Model:
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- Horizontal_Datum_Name: D North American 1983 HARN
- Ellipsoid_Name: GRS 1980
- Semi-major_Axis: 6378137.0
- Denominator_of_Flattening_Ratio: 298.257222101
- Entity_and_Attribute_Information:
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- Detailed_Description:
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- Entity_Type:
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- Entity_Type_Label: GISDBB.GISBROW.PRECINCT_POLY
- Attribute:
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- Attribute_Label: PR_NUMBER
- Attribute_Definition: Unique identifying number for each precinct.
- Attribute_Definition_Source: Loudoun County
- Attribute_Domain_Values:
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- Unrepresentable_Domain:
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User generated number; first digit equals Election District location
- Attribute:
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- Attribute_Label: PR_POP2010
- Attribute_Definition: 2010 population of the precinct
- Attribute_Definition_Source: Loudoun County
- Attribute_Domain_Values:
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- Unrepresentable_Domain: User generated number
- Attribute:
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- Attribute_Label: PR_HUNITS2010
- Attribute_Definition: 2010 housing unit count of the precinct
- Attribute_Definition_Source: Loudoun County
- Attribute_Domain_Values:
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- Unrepresentable_Domain: User generated number
- Attribute:
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- Attribute_Label: PR_HHLDS2010
- Attribute_Definition:
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2010 households of the precinct. Households are occupied housing units.
- Attribute_Definition_Source: Loudoun County
- Attribute_Domain_Values:
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- Unrepresentable_Domain: User generated number
- Attribute:
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- Attribute_Label: OBJECTID
- Attribute_Definition: Internal feature number.
- Attribute_Definition_Source: ESRI
- Attribute_Domain_Values:
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- Unrepresentable_Domain:
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Sequential unique whole numbers that are automatically generated.
- Attribute:
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- Attribute_Label: PR_UPD_USER
- Attribute_Definition:
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Not for public distribution. Internal User ID of editor creating or modifying feature class.
- Attribute_Definition_Source: Loudoun County
- Attribute:
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- Attribute_Label: PR_UPD_DATE
- Attribute_Definition: Date feature class created or modified.
- Attribute_Definition_Source: Loudoun County
- Attribute_Domain_Values:
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- Unrepresentable_Domain: User generated number
- Attribute:
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- Attribute_Label: SHAPE
- Attribute_Definition: Feature geometry.
- Attribute_Definition_Source: ESRI
- Attribute_Domain_Values:
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- Unrepresentable_Domain: Coordinates defining the features.
- Attribute:
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- Attribute_Label: PR_NAME
- Attribute_Definition: Name of Precinct
- Attribute_Definition_Source: Loudoun County
- Attribute_Domain_Values:
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- Unrepresentable_Domain: User generated text
- Attribute:
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- Attribute_Label: Shape.STArea()
- Attribute:
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- Attribute_Label: Shape.STLength()
- Distribution_Information:
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- Distributor:
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- Contact_Information:
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- Contact_Organization_Primary:
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- Contact_Organization: Loudoun County, VA, OMAGI
- Contact_Position: Public Information Counter
- Contact_Address:
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- Address_Type: mailing and physical
- Address: MS 65
- Address: 1 Harrison Street S.E., 2nd floor
- City: Leesburg
- State_or_Province: VA
- Postal_Code: 20175
- Country: US
- Contact_Voice_Telephone: (703)771-5778
- Contact_Facsimile_Telephone: (703)771-5075
- Contact_Electronic_Mail_Address: mapping@loudoun.gov
- Hours_of_Service: 8:00-4:30 EST, M-F
- Distribution_Liability: See access and use constraints information.
- Standard_Order_Process:
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- Digital_Form:
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- Digital_Transfer_Information:
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- Format_Name: DXF
- Format_Specification: AutoCad Digital Exchange File
- Digital_Transfer_Option:
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- Offline_Option:
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- Offline_Media: dvd
- Fees:
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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.
- Ordering_Instructions:
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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.
- Metadata_Reference_Information:
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- Metadata_Date: 20150713
- Metadata_Contact:
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- Contact_Information:
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- Contact_Organization_Primary:
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- Contact_Organization: Loudoun County, VA, OMAGI
- Contact_Position: Metadata Specialist
- Contact_Address:
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- Address_Type: mailing and physical
- Address: MS 65
- Address: 1 Harrison Street SE, 2nd Floor
- City: Leesburg
- State_or_Province: VA
- Postal_Code: 20175
- Country: US
- Contact_Voice_Telephone: (703)771-5778
- Contact_Facsimile_Telephone: (703)771-5075
- Contact_Electronic_Mail_Address: mapping@loudoun.gov
- Hours_of_Service: 8:00-4:30 EST, M-F
- Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata
- Metadata_Standard_Version: FGDC-STD-001-1998
- Metadata_Time_Convention: local time
- Metadata_Use_Constraints:
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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.
Generated by mp version 2.9.12 on Mon Jul 20 09:56:33 2015