Traffic Analysis Zones' (TAZ) Employment Data
Metadata also available as
Metadata:
- Identification_Information:
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- Citation:
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- Citation_Information:
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- Originator: Loudoun County, VA, Department of Planning, Demographer
- Publication_Date: 20140326
- Title: Traffic Analysis Zones' (TAZ) Employment Data
- Geospatial_Data_Presentation_Form: tabular digital data
- Other_Citation_Details:
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Loudoun County's Traffic Analysis Zones (TAZ) were delineated by Loudoun County Government in cooperation with the Metropolitan Washington Council of Governments (MWCOG). The TAZ layer has been modified from the MWCOG TAZ GIS layer. When the MWCOG GIS layer is overlaid with Loudoun County Government's detailed GIS layers it can be determined that the MWCOG TAZ 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 Loudoun TAZ layer was generated by Loudoun County so that the TAZ boundaries would overlay with the features in Loudoun County's GIS data sets that the boundaries are designated to follow. The forecasts for the TAZs are updated by Loudoun County generally once every year to account for changes in market conditions, rezonings, and comprehensive plan amendments. The TAZ boundaries remain unchanged for a period of about ten to fifteen years.
- Description:
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- Abstract:
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The employment data represents Loudoun County's Round 8.3 Metropolitan Washington Council of Government's Cooperative Forecasts as of March 7, 2014. Employment data from 2011 provides a basis for the forecasts. The data includes the total numbers of jobs estimated to be in Loudoun County in 2010 and expected to be in Loudoun from 2015 through 2040 in five-year increments by Traffic Analysis Zones (TAZ). The employment forecasts are divided into five categories: 1) total employment, 2) industrial employment, 3) office employment, 4) retail employment, and 5) other employment. Forecasts for the TAZs are produced by Loudoun County by accounting for regional and local market trends, zoning, planned land use, and the long-range supply of land.
- Purpose:
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The current TAZ boundaries are used for statistical data tabulation purposes, including the current MWCOG cooperative forecasting rounds and future forecasting rounds through approximately 2020. TAZ forecasts are used for demographic analyses of Loudoun County, as well as for Loudoun County and Washington, D.C. regional planning purposes. A detailed picture of population, housing, and employment, within a TAZ is gained from the TAZ forecasts. TAZ forecasts are also used extensively for transportation modeling and transportation planning.
- 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: Irregular
- Keywords:
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- Theme:
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- Theme_Keyword_Thesaurus: None: Employee generated
- Theme_Keyword: population
- Theme_Keyword: boundary
- Theme_Keyword: boundaries
- Theme_Keyword: demographic
- Theme_Keyword: TAZ
- Theme_Keyword: traffic
- Theme_Keyword: COG
- Theme_Keyword: housing units
- Theme_Keyword: household
- Theme_Keyword: region
- Theme_Keyword: forecast
- Theme:
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- Theme_Keyword_Thesaurus: ISO 19115 Topic Categories
- Theme_Keyword: society
- Theme_Keyword: boundaries
- Place:
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- Place_Keyword_Thesaurus: None: Employee generated
- Place_Keyword: Washington
- Place_Keyword: Virginia
- Place_Keyword: D.C.
- Place_Keyword: 51107
- Place_Keyword: DC
- Place_Keyword: County
- 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: Loudoun County, VA, Department of Planning
- Contact_Position: Demographer
- Contact_Address:
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- Address_Type: mailing and physical
- Address: 1 Harrison St, SE
- Address: MS 62
- City: Leesburg
- State_or_Province: VA
- Postal_Code: 20175
- Country: US
- Contact_Voice_Telephone: (703) 777-0246
- Contact_Facsimile_Telephone: (703) 777-0441
- Contact_Electronic_Mail_Address: dop@loudoun.gov
- Hours_of_Service: 8:30-5:00 EST, M-F
- Native_Data_Set_Environment:
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Microsoft Windows Server 2008 Version 6.0 (Build 6002) Service Pack 2; ESRI ArcGIS 10.0.5.4400
- 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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- Type_of_Source_Media: None
- Source_Time_Period_of_Content:
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- Time_Period_Information:
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- Single_Date/Time:
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- Calendar_Date: 20100101
- Source_Currentness_Reference: Unknown
- 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 TAZ boundaries.
- Source_Information:
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- Type_of_Source_Media: None
- Source_Time_Period_of_Content:
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- Time_Period_Information:
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- Single_Date/Time:
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- Calendar_Date: 20110101
- Source_Currentness_Reference: Unknown
- Source_Contribution:
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Loudoun County Government GIS digitized block lines for aligning TAZ data with Loudoun County GIS data
- Source_Information:
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- Source_Citation:
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- Citation_Information:
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- Originator: Loudoun County Department of Management and Financial Services
- Title: Loudoun County Department of Planning
- Geospatial_Data_Presentation_Form: spreadsheet
- Type_of_Source_Media: hardcopy
- Source_Citation_Abbreviation: Loudoun County Department of Planning
- Source_Contribution:
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Loudoun County Department of Planning is the source for population, housing units, households, and employment for TAZs.
- Source_Information:
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- Type_of_Source_Media: onLine
- 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 following is a description of the process used to derive the 2010 to 2040 employment. First, the forecasting of new building square footage for each type of employment is performed for TAZs using issued building permits, zoning, planned land use, local market trends, the long-range supply of land, and guidance from the Loudoun County Department of Economic Development and Loudoun County Fiscal Impact Committee, a Loudoun County Board appointed committee. The forecasted new employment by employment type is then calculated by multiplying the forecasted square footage of an employment type by a ratio of estimated persons per thousand square feet for an employment type. In some cases the results are then adjusted using sound and reasonable judgment due to the ratio of persons per thousand square footage for an employment type being too high or too low for certain types of businesses (e.g. data centers). A TAZs total employment for 2010 to 2040 is forecasted by using a 2008 employment database of total employees by establishment and adding the TAZ's total new employment forecasted to the base total employment number.
- 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 Planning
- Contact_Position: Demographer
- Spatial_Data_Organization_Information:
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- Indirect_Spatial_Reference: Loudoun County
- Point_and_Vector_Object_Information:
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- SDTS_Terms_Description:
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- SDTS_Point_and_Vector_Object_Type: Entity point
- Point_and_Vector_Object_Count: 0
- SDTS_Terms_Description:
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- SDTS_Point_and_Vector_Object_Type: Entity point
- Point_and_Vector_Object_Count: 812
- SDTS_Terms_Description:
-
- SDTS_Point_and_Vector_Object_Type: Entity point
- Point_and_Vector_Object_Count: 161
- SDTS_Terms_Description:
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- SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains
- Point_and_Vector_Object_Count: 282
- SDTS_Terms_Description:
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- SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains
- Point_and_Vector_Object_Count: 161
- 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.TAZ_EMPLOYMENT
- Attribute:
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- Attribute_Label: Ret_2010
- Attribute_Definition: Estimated number of Retail jobs in 2010
- Attribute_Definition_Source: Department of Planning
- Attribute_Domain_Values:
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- Unrepresentable_Domain: User generated text
- 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: TAZ
- Attribute_Definition: Unique identifying number for each Traffic Analysis Zone
- Attribute_Definition_Source: Department of Planning
- Attribute_Domain_Values:
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- Unrepresentable_Domain: User generated text
- Attribute:
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- Attribute_Label: Ret_2035
- Attribute_Definition: Estimated number of Retail jobs in 2035
- Attribute_Definition_Source: Department of Planning
- Attribute_Domain_Values:
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- Unrepresentable_Domain: user generated text
- Attribute:
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- Attribute_Label: Emp_2035
- Attribute_Definition: Estimated number of Total jobs in 2035
- Attribute_Definition_Source: Department of Planning
- Attribute_Domain_Values:
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- Unrepresentable_Domain: user generated text
- Attribute:
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- Attribute_Label: Ind_2035
- Attribute_Definition: Estimated number of Industrial jobs in 2035
- Attribute_Definition_Source: Department of Planning
- Attribute_Domain_Values:
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- Unrepresentable_Domain: user generated text
- Attribute:
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- Attribute_Label: Oth_2030
- Attribute_Definition: Estimated number of Other jobs in 2030
- Attribute_Definition_Source: Department of Planning
- Attribute_Domain_Values:
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- Unrepresentable_Domain: user generated text
- Attribute:
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- Attribute_Label: Ind_2030
- Attribute_Definition: Estimated number of Industrial jobs in 2030
- Attribute_Definition_Source: Department of Planning
- Attribute_Domain_Values:
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- Unrepresentable_Domain: user generated text
- Attribute:
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- Attribute_Label: Off_2040
- Attribute_Definition: Estimated number of Office jobs in 2040
- Attribute_Definition_Source: Department of Planning
- Attribute_Domain_Values:
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- Unrepresentable_Domain: user generated text
- Attribute:
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- Attribute_Label: Oth_2040
- Attribute_Definition: Estimated number of Other jobs in 2040
- Attribute_Definition_Source: Department of Planning
- Attribute_Domain_Values:
-
- Unrepresentable_Domain: user generated text
- Attribute:
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- Attribute_Label: Ind_2040
- Attribute_Definition: Estimated number of Industrial jobs in 2040
- Attribute_Definition_Source: Department of Planning
- Attribute_Domain_Values:
-
- Unrepresentable_Domain: user generated text
- Attribute:
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- Attribute_Label: Ret_2040
- Attribute_Definition: Estimated number of Retail jobs in 2040
- Attribute_Definition_Source: Department of Planning
- Attribute_Domain_Values:
-
- Unrepresentable_Domain: user generated text
- Attribute:
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- Attribute_Label: Off_2035
- Attribute_Definition: Estimated number of Office jobs in 2035
- Attribute_Definition_Source: Department of Planning
- Attribute_Domain_Values:
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- Unrepresentable_Domain: user generated text
- Attribute:
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- Attribute_Label: Oth_2015
- Attribute_Definition: Estimated number of Other jobs in 2015
- Attribute_Definition_Source: Department of Planning
- Attribute_Domain_Values:
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- Unrepresentable_Domain: user generated text
- Attribute:
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- Attribute_Label: Emp_2020
- Attribute_Definition: Estimated number of Total jobs in 2020
- Attribute_Definition_Source: Department of Planning
- Attribute_Domain_Values:
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- Unrepresentable_Domain: user generated text
- Attribute:
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- Attribute_Label: Oth_2025
- Attribute_Definition: Estimated number of Other jobs in 2025
- Attribute_Definition_Source: Department of Planning
- Attribute_Domain_Values:
-
- Unrepresentable_Domain: user generated text
- Attribute:
-
- Attribute_Label: Off_2025
- Attribute_Definition: Estimated number of Office jobs in 2025
- Attribute_Definition_Source: Department of Planning
- Attribute_Domain_Values:
-
- Unrepresentable_Domain: user generated text
- Attribute:
-
- Attribute_Label: Emp_2025
- Attribute_Definition: Estimated number of Total jobs in 2025
- Attribute_Definition_Source: Department of Planning
- Attribute_Domain_Values:
-
- Unrepresentable_Domain: user generated text
- Attribute:
-
- Attribute_Label: Ind_2025
- Attribute_Definition: Estimated number of Industrial jobs in 2025
- Attribute_Definition_Source: Department of Planning
- Attribute_Domain_Values:
-
- Unrepresentable_Domain: user generated text
- Attribute:
-
- Attribute_Label: Emp_2015
- Attribute_Definition: Estimated number of Total jobs in 2015
- Attribute_Definition_Source: Department of Planning
- Attribute_Domain_Values:
-
- Unrepresentable_Domain: user generated text
- Attribute:
-
- Attribute_Label: Off_2030
- Attribute_Definition: Estimated number of Office jobs in 2030
- Attribute_Definition_Source: Department of Planning
- Attribute_Domain_Values:
-
- Unrepresentable_Domain: user generated text
- Attribute:
-
- Attribute_Label: Ret_2025
- Attribute_Definition: Estimated number of Retail jobs in 2025
- Attribute_Definition_Source: Department of Planning
- Attribute_Domain_Values:
-
- Unrepresentable_Domain: user generated text
- Attribute:
-
- Attribute_Label: Off_2020
- Attribute_Definition: Estimated number of Office jobs in 2020
- Attribute_Definition_Source: Department of Planning
- Attribute_Domain_Values:
-
- Unrepresentable_Domain: user generated text
- Attribute:
-
- Attribute_Label: Ret_2020
- Attribute_Definition: Estimated number of Retail jobs in 2020
- Attribute_Definition_Source: Department of Planning
- Attribute_Domain_Values:
-
- Unrepresentable_Domain: user generated text
- Attribute:
-
- Attribute_Label: Off_2015
- Attribute_Definition: Estimated number of Office jobs in 2015
- Attribute_Definition_Source: Department of Planning
- Attribute_Domain_Values:
-
- Unrepresentable_Domain: user generated text
- Attribute:
-
- Attribute_Label: Off_2010
- Attribute_Definition: Estimated number of Office jobs in 2010
- Attribute_Definition_Source: Department of Planning
- Attribute_Domain_Values:
-
- Unrepresentable_Domain: User generated text
- Attribute:
-
- Attribute_Label: Oth_2010
- Attribute_Definition: Estimated number of Other jobs in 2010
- Attribute_Definition_Source: Department of Planning
- Attribute_Domain_Values:
-
- Unrepresentable_Domain: user generated text
- Attribute:
-
- Attribute_Label: Emp_2030
- Attribute_Definition: Estimated number of Total jobs in 2030
- Attribute_Definition_Source: Department of Planning
- Attribute_Domain_Values:
-
- Unrepresentable_Domain: user generated text
- Attribute:
-
- Attribute_Label: Oth_2020
- Attribute_Definition: Estimated number of Other jobs in 2020
- Attribute_Definition_Source: Department of Planning
- Attribute_Domain_Values:
-
- Unrepresentable_Domain: user generated text
- Attribute:
-
- Attribute_Label: Ret_2015
- Attribute_Definition: Estimated number of Retail jobs in 2015
- Attribute_Definition_Source: Department of Planning
- Attribute_Domain_Values:
-
- Unrepresentable_Domain: user generated text
- Attribute:
-
- Attribute_Label: Emp_2040
- Attribute_Definition: Estimated number of Total jobs in 2040
- Attribute_Definition_Source: Department of Planning
- Attribute_Domain_Values:
-
- Unrepresentable_Domain: user generated text
- Attribute:
-
- Attribute_Label: Ind_2020
- Attribute_Definition: Estimated number of Industrial jobs in 2020
- Attribute_Definition_Source: Department of Planning
- Attribute_Domain_Values:
-
- Unrepresentable_Domain: user generated text
- Attribute:
-
- Attribute_Label: Ret_2030
- Attribute_Definition: Estimated number of Retail jobs in 2030
- Attribute_Definition_Source: Department of Planning
- Attribute_Domain_Values:
-
- Unrepresentable_Domain: user generated text
- Attribute:
-
- Attribute_Label: Oth_2035
- Attribute_Definition: Estimated number of Other jobs in 2035
- Attribute_Definition_Source: Department of Planning
- Attribute_Domain_Values:
-
- Unrepresentable_Domain: user generated text
- Attribute:
-
- Attribute_Label: Emp_2010
- Attribute_Definition: Estimated number of Total jobs in 2010
- Attribute_Definition_Source: Department of Planning
- Attribute_Domain_Values:
-
- Unrepresentable_Domain: User generated text
- Attribute:
-
- Attribute_Label: Ind_2015
- Attribute_Definition: Estimated number of Industrial jobs in 2015
- Attribute_Definition_Source: Department of Planning
- Attribute_Domain_Values:
-
- Unrepresentable_Domain: user generated text
- Attribute:
-
- Attribute_Label: Ind_2010
- Attribute_Definition: Estimated number of Industrial jobs in 2010
- Attribute_Definition_Source: Department of Planning
- Attribute_Domain_Values:
-
- Unrepresentable_Domain: User generated text
- Distribution_Information:
-
- Distributor:
-
- Contact_Information:
-
- Contact_Organization_Primary:
-
- Contact_Organization: Loudoun County, VA OMAGI
- Contact_Position: Public Information Counter
- Contact_Address:
-
- 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:
-
- Digital_Form:
-
- Digital_Transfer_Information:
-
- Format_Name: DXF
- Format_Specification: AutoCad Digital Exchange File
- Digital_Transfer_Option:
-
- Offline_Option:
-
- Offline_Media: dvd
- 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.
- Ordering_Instructions:
-
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:
-
- Metadata_Date: 20140401
- Metadata_Contact:
-
- Contact_Information:
-
- Contact_Organization_Primary:
-
- Contact_Organization:
-
Loudoun County, VA, Office of Mapping & Geographic Information (OMAGI)
- Contact_Position: Metadata Specialist
- Contact_Address:
-
- 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 2.9.6 on Tue Apr 01 09:28:15 2014