PARCELS


Identification Information:
Citation:
Citation Information:
Title: PARCELS
Geospatial Data Presentation Form: vector digital data
Publication Information:
Publisher: Fairfax County Government
Description:
Abstract: This layer contains cadastral information for Fairfax County, Virginia. This includes, but is not limited to the portrayal of polygonal features (such as parcels, subdivisions and easements), text (parcel numbers, street names and addresses), and symbols (parkland, schools, "double circles", etc.). This layer was initially developed as a digital copy of the ink-on-mylar property maps maintained by the County since the early 1960's.
Purpose: This layer was created to depict subdivided land, parcels, rights-of-way, and easements created by recorded documents (deeds and plats) within the County of Fairfax. Primary purpose of this data is the graphic portrayal of land parcels and their spatial relationships throughout Fairfax County. Secondary uses of this data are as a backdrop for other large-scale data sets such as Zoning, Soils, Resource Protection areas, etc.
Time Period of Content:
Time Period Information:
Range of Dates/Times:
Beginning Date: 20000101
Currentness Reference: publication date
Status:
Progress: Complete
Maintenance and Update Frequency: Daily
Spatial Domain:
Bounding Coordinates:
West Bounding Coordinate: -180
East Bounding Coordinate: 180
North Bounding Coordinate: 90
South Bounding Coordinate: -90
Keywords:
Theme:
Theme Keyword Thesaurus: None
Theme Keyword: Lot
Theme Keyword: Acreage
Theme Keyword: Property
Theme Keyword: Parcel
Place:
Place Keyword Thesaurus: None
Place Keyword: Fairfax County
Place Keyword: Virginia
Place Keyword: USA
Access Constraints: None
Use Constraints: https://www.fairfaxcounty.gov/maps/disclaimer
Point of Contact:
Contact Information:
Contact Organization Primary:
Contact Organization: Fairfax County GIS and Mapping Services
Contact Position: GIS Data Manager
Contact Address:
Address Type: mailing and physical
Address: 12000 Government Center Pw. Suite 117
City: Fairfax
State or Province: VA
Postal Code: 22035
Country: US
Contact Voice Telephone: (703)-324-2712
Contact TDD/TTY Telephone: 711
Contact Facsimile Telephone: (703)-324-3937
Contact Electronic Mail Address: gis.helpq@fairfaxcounty.gov
Hours: Monday - Friday 9:00am - 3:00pm (EST)
Data Set Credit: The data set was created by Analytical Surveys Incorporated (ASI) and Landata under contract to Fairfax County. Quality control checks were performed by Engineering Systems Incorporated and Dewberry and Davis. Staff from the GIS branch were also used for quality control checking. Since 2001 Fairfax County staff have been solely responsible for maintaining this data.
Native Data Set Environment: Version 6.2 (Build 9200) ; Esri ArcGIS 10.2.1.3497
Data Quality Information:
Attribute Value Accuracy Information:
Attribute Accuracy Report: Attribute accuracy was tested by comparing the values of the attributes with REABS data. The draw symbol attribute was checked by plotting the features on the standard map product and ensuring the features appeared and were drawn correctly.
Logical Consistency Report: Segments making up the outer and inner boundaries of a polygon tie end-to-end to completely enclose the area. No duplicate features exist. Intersecting lines are separated into individual line segments at the point of intersection. All nodes are represented by a single coordinate pair, which indicates the beginning or end of a line segment. Logical consistency was tested by visual inspection and automated quality control procedures.
Completeness Report: Continually being updated. Errors being corrected as they are found. Resolving missing parcels by comparing to DTA CAMA data. QC of data being done prior to updates.
Positional Accuracy:
Horizontal Positional Accuracy:
Horizontal Positional Accuracy Report: Horizontal positional accuracy for the digital data is tested by visual comparison of the source plats with hard copy plots.
Lineage:
Source Information:
Source Citation:
Citation Information:
Publication Date: 19970101
Title: Mylar Property
Source Scale Denominator: 2400
Type of Source Media: hardcopyDiazo
Source Time Period of Content:
Time Period Information:
Range of Dates/Times:
Beginning Date: 19970101
Source Currentness Reference: publication date
Source Citation Abbreviation: Mylar Property
Process Step:
Process Description:
This is the process that was used by the data conversion vendor to take the property data from mylar to digital.

Mount mylar on digitizer and register. Get Root Mean Square (RMS) better than 3.5 feet. Digitize tile neatline. 

Digitize all data from source mylar. Overlay street name mylar. Capture all street names and additional line work.

First quality check of digital data. Each file was plotted and checked for accuracy by overlaying plotted digital data on mylar sources. All interior data and data up to one inch outside the neatline is checked.

Code linework so it will be the proper entity on the map. Code annotation so that each text will go into the proper layer. Code points so they will be the correct symbol (Church, School, etc, etc.).

Line attribution and polygon building. Code linework correctly for map display. Code polygon correctly so that the data goes into the correct region subclass in ArcInfo.

Automated data cleanup. This includes removing overshoots and undershoots, breaking all lines at intersecting lines and rotating annotation with 15 feet at a line to the same angle as the line.

Perform on screen best fit of the data using planimetric data as a reference. Keep individual parcel distortion to a minimum. Parcels less than one acre should not be altered more than 10 feet. Parcels more than one acre should not be altered more than 20 feet. Do block adjustment.

Edgematch data with surrounding tiles. Lines must be snapped. Polygon attribution must be identical. Deleted problems are logged, researched and corrected.

Quality assurance check is performed on best fit composite data. Mark up and directives for actual placement are noted by reviewer. GIS technician adjusts data as noted.

Translation from APS to ArcInfo. Regions are built and the data is translated.

Second quality check. ArcInfo data was plotted and overlaid on source mylars to review the overall quality and consistency. If changes are needed the files are fixed in APS, retranslated and replotted.

Second pass of automated data cleanup. This is to be sure editor did not introduce any new errors.

Composite data is merged into extracted data. Topology is built and data is attributed and annotation is constructed. Check is preformed for topology and label errors. Quality control program is run by GIS technicians. Data is submitted for final review and acceptance.
Source Used Citation Abbreviation: Mylar
Process Date: 19971999
Source Produced Citation Abbreviation: Digital property data
Process Contact:
Contact Information:
Contact Organization Primary:
Contact Organization: Fairfax County GIS and Mapping Services
Contact Position: GIS Data Manager
Contact Address:
Address Type: mailing and physical
Address: 12000 Government Center Pw. Suite 117
City: Fairfax
State or Province: VA
Postal Code: 22035
Country: US
Contact Voice Telephone: (703)-324-2712
Contact TDD/TTY Telephone: 711
Contact Facsimile Telephone: (703)-324-3937
Contact Electronic Mail Address: gis.helpq@fairfaxcounty.gov
Hours: Monday - Friday 9:00am - 3:00pm (EST)
Process Step:
Process Description:
Plat documents are received in the GIS and Mapping Services office. The document is reviewed for control with NAD83, deed reference confirmation, and reconciliation of volume and parent parcels.

Parcel identifiers are assigned to the parcels. Double circle (subdivision number) are determined.

Documents are processed by discarding any preliminary plats, pins entered into Masterparcel tool, distribution of assessment copy, and folder prepared for GIS analyst.

Quality control procedures are performed by reviewer including visual inspection, attribute check, and validity check. If no errors are found data is posted to the database. If errors are found returned to GIS analyst for corrections.
Source Used Citation Abbreviation: Subdivision Plat
Process Date: 20002004
Source Produced Citation Abbreviation: Parcels
Spatial Data Organization Information:
Indirect Spatial Reference: Parcels
Direct Spatial Reference Method: Vector
Point and Vector Object Information:
SDTS Terms Description:
SDTS Point and Vector Object Type: GT-polygon composed of chains
Point and Vector Object Count: 361013
Entity and Attribute Information:
Detailed Description:
Entity Type:
Entity Type Label: Parcels
Entity Type Definition: Polygon
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: PIN
Attribute Definition: Parcel Identification Number
Attribute Definition Source: Fairfax County
Attribute Domain Values:
Unrepresentable Domain: Parcel ID number contains map grid, map quad, subdivison number, block number, lot number, and sub-lot number.
Beginning Date of Attribute Values: 1997-03-01
Attribute:
Attribute Label: PARCEL_KEY
Attribute Definition: Parcel key
Attribute Definition Source: Fairfax County
Attribute Domain Values:
Unrepresentable Domain: Numeric key for each parcel. Each parcel number is assigned a unique numeric key.
Attribute:
Attribute Label: PARCEL_TYPE
Attribute Definition: Parcel type
Attribute Definition Source: Fairfax County
Attribute Domain Values:
Enumerated Domain:
Enumerated Domain Value: ORDINARY
Enumerated Domain Value Definition: Ordinary parcel
Enumerated Domain Value Definition Source: Fairfax County
Attribute Domain Values:
Enumerated Domain:
Enumerated Domain Value: CONDO
Enumerated Domain Value Definition: Condominium parcel
Enumerated Domain Value Definition Source: Fairfax County
Attribute:
Attribute Label: SRC_CONTROL
Attribute Definition: Source control type
Attribute Definition Source: Fairfax County
Attribute Domain Values:
Enumerated Domain:
Enumerated Domain Value: NONE
Enumerated Domain Value Definition: Parcel was entered into the layer using no control points
Enumerated Domain Value Definition Source: Fairfax County
Attribute Domain Values:
Enumerated Domain:
Enumerated Domain Value: UNKN
Enumerated Domain Value Definition: Unknown - the parcel was entered in to the layer prior to tracking source control.
Enumerated Domain Value Definition Source: Fairfax County
Attribute Domain Values:
Enumerated Domain:
Enumerated Domain Value: VCS83
Enumerated Domain Value Definition: Parcel was entered into the layer using Virginia State Plane NAD 83 coordinates that were provided on the plat. Typically surrounding parcels would be adjusted to fit to these new parcels.
Enumerated Domain Value Definition Source: Fairfax County
Attribute Domain Values:
Enumerated Domain:
Enumerated Domain Value: COGO
Enumerated Domain Value Definition: These parcels were entered into the layer using coordinate geometry.
Enumerated Domain Value Definition Source: Fairfax County
Attribute Domain Values:
Enumerated Domain:
Enumerated Domain Value: ADJVS
Enumerated Domain Value Definition: These parcels typically are adjacent to parcels that were entered into the layer using the VCS83 source type and had to be adjusted to fit the better accuracy parcels.
Enumerated Domain Value Definition Source: Fairfax County
Attribute:
Attribute Label: SHAPE
Attribute Definition: Feature geometry.
Attribute Definition Source: ESRI
Attribute Domain Values:
Unrepresentable Domain: Coordinates defining the features.
Attribute:
Attribute Label: SHAPE.AREA
Attribute:
Attribute Label: SHAPE.LEN
Attribute Definition: Shape Length
Attribute Definition Source: Fairfax County
Overview Description:
Entity and Attribute Overview:
This layer contains polygons. Each feature contains the parcel identifier (PIN). The PIN structure can be located on the Fairfax County web site (http:). 
				The feature also contains the date in which it was added to the database.
Distribution Information:
Distributor:
Contact Information:
Contact Organization Primary:
Contact Organization: Fairfax County GIS and Mapping Services
Contact Position: Front Counter
Contact Address:
Address Type: mailing and physical
Address: 12000 Government Center Pw. Suite 117
City: Fairfax
State or Province: VA
Postal Code: 22035
Country: US
Contact Voice Telephone: (703)-324-2712
Contact TDD/TTY Telephone: 711
Contact Facsimile Telephone: (703)-324-3937
Contact Electronic Mail Address: gis.helpq@fairfaxcounty.gov
Hours: Monday - Friday 9:00am - 3:00pm (EST)
Distribution Liability: Disclaimer: This data is NOT to be construed or used as a “legal description”. It is not a survey product. Any determination of topography or contours, or any depiction of physical improvements, property lines or boundaries is for general information only and shall not be used for the design, modification, or construction of improvements to real property or for flood plain determination. While Fairfax County strives to provide the best data possible, it does not provide any guarantee of accuracy or completeness regarding the data. Any errors or omissions should be reported to the Fairfax County Geographic Information Systems and Mapping Services Branch of the Department of Information Technology. In no event will Fairfax County be liable for any damages, including but not limited to loss of data, lost profits, business interruption, loss of business information or any other pecuniary loss that might arise from the use of this data. Acknowledgement of the Fairfax County GIS branch would be appreciated in products derived from these data.
Metadata Reference Information:
Metadata Date: 20170612
Metadata Review Date: 20040714
Metadata Future Review Date: 20180201
Metadata Contact:
Contact Information:
Contact Organization Primary:
Contact Organization: Fairfax County GIS and Mapping Services
Contact Position: GIS Data Manager
Contact Address:
Address Type: mailing and physical
Address: 12000 Government Center Pw. Suite 117
City: Fairfax
State or Province: VA
Postal Code: 22035
Country: US
Contact Voice Telephone: (703)-324-2712
Contact TDD/TTY Telephone: 711
Contact Facsimile Telephone: (703)-324-3937
Contact Electronic Mail Address: gis.helpq@fairfaxcounty.gov
Hours: Monday - Friday 9:00am - 3:00pm (EST)
Metadata Standard Name: FGDC Content Standard for Digital Geospatial Metadata
Metadata Standard Version: FGDC-STD-001-1998
Metadata Time Convention: local time