Traffic Analysis Zones' (TAZ) New Housing Units by Type Data

Metadata:

• Identification_Information
• Data_Quality_Information
• Spatial_Data_Organization_Information
• Entity_and_Attribute_Information
• Distribution_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: Loudoun County, VA, Department of Planning, Demographer

Publication_Date: 20140326

Title: Traffic Analysis Zones' (TAZ) New Housing Units by Type Data

Geospatial_Data_Presentation_Form: tabular digital data

Other_Citation_Details:

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:

Abstract:

The new housing units by unit type data represents Loudoun County's Round 8.3 Metropolitan Washington Council of Government's Cooperative Forecasts as of March 7, 2014. The forecast data are the total number of new housing units by unit type expected in Loudoun County from 2010 through 2040 in five-year increments by Traffic Analysis Zones (TAZ). Each five-year increment represents the growth from April 1st of the beginning year to March 31st of the ending year. For instance, 2010 to 2015 represents growth from April 1, 2010 to March 31, 2015. The new housing units by unit type data are divided into five categories: 1) total new housing units, 2) new Single-Family Detached (SFD) units, 3) new Single-Family Attached (SFA) units, 4) new Multi-family Attached (MFA) units, and 5) new Multi-Family Stacked (MFST). 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:

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:

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:

Progress: Complete

Maintenance_and_Update_Frequency: Irregular

Keywords:

Theme:

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:

Theme_Keyword_Thesaurus: ISO 19115 Topic Categories

Theme_Keyword: society

Theme_Keyword: boundaries

Place:

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:

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:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Loudoun County, VA, Department of Planning

Contact_Position: Demographer

Contact_Address:

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:

Microsoft Windows Server 2008 Version 6.0 (Build 6002) Service Pack 2; ESRI ArcGIS 10.0.5.4400

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report:

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:

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:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

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:

Source_Information:

Source_Citation:

Citation_Information:

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:

Loudoun County Department of Planning is the source for population, housing units, households, and employment for TAZs.

Source_Information:

Type_of_Source_Media: onLine

Source_Contribution:

The 2010 Census SF1 block data were the basis for deriving the demographic data.

Source_Information:

Type_of_Source_Media: None

Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 20110101

Source_Currentness_Reference: Unknown

Source_Contribution:

Loudoun County Government GIS digitized block lines for aligning TAZ data with Loudoun County GIS data

Source_Information:

Source_Citation:

Citation_Information:

Publication_Date: 20140311

Title: Loudoun County Residential Permit Monthly Trends

Other_Citation_Details:

Monthly Trends report is 2014 Year-to-Date through January 31, 2014

Type_of_Source_Media: None

Source_Citation_Abbreviation: Loudoun County Residential Permit Monthly Trends

Source_Contribution:

o In the Round 8.3 Forecasts, the previous Multi-Family housing unit type was split into two new categories: the Multi-Family Attached (MFA) and Multi-Family Stacked housing unit type. Both are buildings containing multiple dwelling units. MFA's are commonly referred to as "garden style", "mid-rise", and "high-rise" condominiums/apartments. Each MFA dwelling unit consists of a single floor/level with one more common entrances to access each unit. MFST's are commonly referred to as "stacked townhomes", "one-over-twos", and "two-over-twos". Each MFST unit within a group has its own ground floor entrance or shares an entrance with only an adjacent unit, and at least one dwelling unit within the group contains 2 or more stories & is situated over/under another dwelling unit.

Source_Information:

Type_of_Source_Media: None

Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 20100101

Source_Currentness_Reference: Unknown

Source_Contribution:

TIGER/Line files provided the foundation upon which census blocks were drawn. The 2010 Census blocks were the basis for devising the TAZ boundaries.

Process_Step:

Process_Description:

The forecasting of new housing units by unit type for TAZs is performed using issued building permits, zoning, planned land use, local market trends, the long-range supply of land, and guidance from the Loudoun County Fiscal Impact Committee, a Loudoun County Board appointed committee. These new housing unit forecasts are then used for calculating the number of new households and new population, when combined with occupancy rate and household size forecasts.

Process_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Loudoun County Department of Planning

Contact_Position: Demographer

Spatial_Data_Organization_Information:

Indirect_Spatial_Reference: Loudoun County

Point_and_Vector_Object_Information:

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains

Point_and_Vector_Object_Count: 282

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: GISDBB.GISBROW.TAZ_NEW_HOUSING_UNITS_BY_TYPE

Attribute:

Attribute_Label: New_SFA_2035

Attribute_Definition:

Estimated number of Single-Family Attached Housing Units (townhomes, duplex, quadraplex) in 2035

Attribute_Definition_Source: Department of Planning

Attribute_Domain_Values:

Unrepresentable_Domain: user generated text

Attribute:

Attribute_Label: New_HU_2035

Attribute_Definition: Estimated number of Housing Units in 2035

Attribute_Definition_Source: Department of Planning

Attribute_Domain_Values:

Unrepresentable_Domain: user generated text

Attribute:

Attribute_Label: New_SFD_2035

Attribute_Definition:

Estimated number of Single-Family Detached Housing Units in 2035

Attribute_Definition_Source: Department of Planning

Attribute_Domain_Values:

Unrepresentable_Domain: user generated text

Attribute:

Attribute_Label: NEW_MFST_2030

Attribute_Definition: Estimated number of Multi-Family Stacked Housing Units in 2030

Attribute_Definition_Source: Department of Planning

Attribute_Domain_Values:

Unrepresentable_Domain: user generated text

Attribute:

Attribute_Label: New_SFD_2030

Attribute_Definition:

Estimated number of Single-Family Detached Housing Units in 2030

Attribute_Definition_Source: Department of Planning

Attribute_Domain_Values:

Unrepresentable_Domain: user generated text

Attribute:

Attribute_Label: NEW_MFA_2040

Attribute_Definition: Estimated number of Multi-Family Attached Housing Units in 2040

Attribute_Definition_Source: Department of Planning

Attribute_Domain_Values:

Unrepresentable_Domain: user generated text

Attribute:

Attribute_Label: NEW_MFST_2040

Attribute_Definition: Estimated number of Multi-Family Stacked Housing Units in 2040

Attribute_Definition_Source: Department of Planning

Attribute_Domain_Values:

Unrepresentable_Domain: user generated text

Attribute:

Attribute_Label: New_SFD_2040

Attribute_Definition:

Estimated number of Single-Family Detached Housing Units in 2040

Attribute_Definition_Source: Department of Planning

Attribute_Domain_Values:

Unrepresentable_Domain: user generated text

Attribute:

Attribute_Label: New_SFA_2040

Attribute_Definition:

Estimated number of Single-Family Attached Housing Units (townhomes, duplex, quadraplex) in 2040

Attribute_Definition_Source: Department of Planning

Attribute_Domain_Values:

Unrepresentable_Domain: user generated text

Attribute:

Attribute_Label: NEW_MFA_2035

Attribute_Definition: Estimated number of Multi-Family Attached Housing Units in 2035

Attribute_Definition_Source: Department of Planning

Attribute_Domain_Values:

Unrepresentable_Domain: user generated text

Attribute:

Attribute_Label: NEW_MFST_2015

Attribute_Definition: Estimated number of Multi-Family Stacked Housing Units in 2015

Attribute_Definition_Source: Department of Planning

Attribute_Domain_Values:

Unrepresentable_Domain: user generated text

Attribute:

Attribute_Label: New_HU_2020

Attribute_Definition: Estimated number of Housing Units in 2020

Attribute_Definition_Source: Department of Planning

Attribute_Domain_Values:

Unrepresentable_Domain: user generated text

Attribute:

Attribute_Label: NEW_MFST_2025

Attribute_Definition: Estimated number of Multi-Family Stacked Housing Units in 2025

Attribute_Definition_Source: Department of Planning

Attribute_Domain_Values:

Unrepresentable_Domain: user generated text

Attribute:

Attribute_Label: NEW_MFA_2025

Attribute_Definition: Estimated number of Multi-Family Attached Housing Units in 2025

Attribute_Definition_Source: Department of Planning

Attribute_Domain_Values:

Unrepresentable_Domain: user generated text

Attribute:

Attribute_Label: New_HU_2025

Attribute_Definition: Estimated number of Housing Units in 2025

Attribute_Definition_Source: Department of Planning

Attribute_Domain_Values:

Unrepresentable_Domain: user generated text

Attribute:

Attribute_Label: New_SFD_2025

Attribute_Definition:

Estimated number of Single-Family Detached Housing Units in 2025

Attribute_Definition_Source: Department of Planning

Attribute_Domain_Values:

Unrepresentable_Domain: user generated text

Attribute:

Attribute_Label: New_HU_2015

Attribute_Definition: Estimated number of Housing Units in 2015

Attribute_Definition_Source: Department of Planning

Attribute_Domain_Values:

Unrepresentable_Domain: user generated text

Attribute:

Attribute_Label: NEW_MFA_2030

Attribute_Definition: Estimated number of Multi-Family Attached Housing Units in 2030

Attribute_Definition_Source: Department of Planning

Attribute_Domain_Values:

Unrepresentable_Domain: user generated text

Attribute:

Attribute_Label: New_SFA_2025

Attribute_Definition:

Estimated number of Single-Family Attached Housing Units (townhomes, duplex, quadraplex) in 2025

Attribute_Definition_Source: Department of Planning

Attribute_Domain_Values:

Unrepresentable_Domain: user generated text

Attribute:

Attribute_Label: NEW_MFA_2020

Attribute_Definition: Estimated number of Multi-Family Attached Housing Units in 2020

Attribute_Definition_Source: Department of Planning

Attribute_Domain_Values:

Unrepresentable_Domain: user generated text

Attribute:

Attribute_Label: New_SFA_2020

Attribute_Definition:

Estimated number of Single-Family Attached Housing Units (townhomes, duplex, quadraplex) in 2020

Attribute_Definition_Source: Department of Planning

Attribute_Domain_Values:

Unrepresentable_Domain: user generated text

Attribute:

Attribute_Label: NEW_MFA_2015

Attribute_Definition: Estimated number of Multi-Family Attached Housing Units in 2015

Attribute_Definition_Source: Department of Planning

Attribute_Domain_Values:

Unrepresentable_Domain: user generated text

Attribute:

Attribute_Label: OBJECTID

Attribute_Definition: Internal feature number.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain:

Sequential unique whole numbers that are automatically generated.

Attribute:

Attribute_Label: TAZ

Attribute_Definition: Unique identifying number for each TAZ

Attribute_Definition_Source: Department of Planning

Attribute_Domain_Values:

Unrepresentable_Domain: user generated text

Attribute:

Attribute_Label: New_HU_2030

Attribute_Definition: Estimated number of Housing Units in 2030

Attribute_Definition_Source: Department of Planning

Attribute_Domain_Values:

Unrepresentable_Domain: user generated text

Attribute:

Attribute_Label: NEW_MFST_2020

Attribute_Definition: Estimated number of Multi-Family Stacked Housing Units in 2020

Attribute_Definition_Source: Department of Planning

Attribute:

Attribute_Label: New_HU_2040

Attribute_Definition: Estimated number of Housing Units in 2040

Attribute_Definition_Source: Department of Planning

Attribute_Domain_Values:

Unrepresentable_Domain: user generated text

Attribute:

Attribute_Label: New_SFD_2020

Attribute_Definition:

Estimated number of Single-Family Detached Housing Units in 2020

Attribute_Definition_Source: Department of Planning

Attribute_Domain_Values:

Unrepresentable_Domain: user generated text

Attribute:

Attribute_Label: New_SFA_2030

Attribute_Definition:

Estimated number of Single-Family Attached Housing Units (townhomes, duplex, quadraplex) in 2030

Attribute_Definition_Source: Department of Planning

Attribute_Domain_Values:

Unrepresentable_Domain: user generated text

Attribute:

Attribute_Label: NEW_MFST_2035

Attribute_Definition: Estimated number of Multi-Family Stacked Housing Units in 2035

Attribute_Definition_Source: Department of Planning

Attribute_Domain_Values:

Unrepresentable_Domain: user generated text

Attribute:

Attribute_Label: New_SFA_2015

Attribute_Definition:

Estimated number of Single-Family Attached Housing Units (townhomes, duplex, quadraplex) in 2015

Attribute_Definition_Source: Loudoun County, M&FS

Attribute_Domain_Values:

Unrepresentable_Domain: user generated text

Attribute:

Attribute_Label: New_SFD_2015

Attribute_Definition:

Estimated number of Single-Family Detached Housing Units in 2015

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:

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.