| Parcels of Loudoun County, VA | |
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Data format: SDE Feature Class File or table name: GISDBB.GISBROW.PARCELS_POLY Coordinate system: Lambert Conformal Conic Theme keywords: boundaries, society, location, parcels, property |
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Abstract:
This data layer contains all parcel boundaries for Loudoun County, VA. A parcel is a tract or plot of land surveyed and defined by legal ownership. Data were compiled from plats and deeds recorded at the Clerk of the Court and from historic tax maps. Source material was digitized or the coordinates were entered into the database via ARC/INFO Coordinate Geometry (COGO). Digital data from engineering companies has also been incorporated for newer subdivisions. A MCPI number is used to identify each parcel, which is a 9 digit unique parcel ID that is a combination of: MAP, CELL, and PARCEL. MAP: 3 digit map number (001-701) corresponding with map tile index. CELL: 2 digit map grid location of parcel center; the grid is comprised of 1000 by 1000 ft grid cells numbered as rows and columns (Columns numbered > 5 6 7 8 9 0; Rows numbered > 1 2 3 4). PARCEL: 4 digit location of polygon center based on the 1983 Virginia State Plane coordinate grid where an easting and northing measurement is taken.
Horizontal Datum: NAD83 HARN, SPCS VA North, FIPS Zone 4501, US Survey Feet
Vertical Datum (if applicable): NAVD88.
The MAP, CELL, and PARCEL values of a parcel do not change when a parcel is altered by a boundary line adjustment or becomes residue from a subdivision. The MAP, CELL, and PARCEL values may therefore be inconsistent with the location of polygon center. MAP, CELL, and PARCEL values have been manually altered for some parcels to agree with other databases; as a result, not all parcels can be located by the MAP, CELL, and PARCEL values. |
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Metadata elements shown with blue text are defined in the Federal Geographic Data Committee's (FGDC) Content Standard for Digital Geospatial Metadata (CSDGM). Elements shown with green text are defined in the ESRI Profile of the CSDGM. Elements shown with a green asterisk (*) will be automatically updated by ArcCatalog. ArcCatalog adds hints indicating which FGDC elements are mandatory; these are shown with gray text.
This data layer contains all parcel boundaries for Loudoun County, VA. A parcel is a tract or plot of land surveyed and defined by legal ownership. Data were compiled from plats and deeds recorded at the Clerk of the Court and from historic tax maps. Source material was digitized or the coordinates were entered into the database via ARC/INFO Coordinate Geometry (COGO). Digital data from engineering companies has also been incorporated for newer subdivisions. A MCPI number is used to identify each parcel, which is a 9 digit unique parcel ID that is a combination of: MAP, CELL, and PARCEL. MAP: 3 digit map number (001-701) corresponding with map tile index. CELL: 2 digit map grid location of parcel center; the grid is comprised of 1000 by 1000 ft grid cells numbered as rows and columns (Columns numbered > 5 6 7 8 9 0; Rows numbered > 1 2 3 4). PARCEL: 4 digit location of polygon center based on the 1983 Virginia State Plane coordinate grid where an easting and northing measurement is taken. Horizontal Datum: NAD83 HARN, SPCS VA North, FIPS Zone 4501, US Survey Feet Vertical Datum (if applicable): NAVD88. The MAP, CELL, and PARCEL values of a parcel do not change when a parcel is altered by a boundary line adjustment or becomes residue from a subdivision. The MAP, CELL, and PARCEL values may therefore be inconsistent with the location of polygon center. MAP, CELL, and PARCEL values have been manually altered for some parcels to agree with other databases; as a result, not all parcels can be located by the MAP, CELL, and PARCEL values.
Parcels are used to support a variety of services including assessment, permitting, subdivision review, planning, zoning, and economic development. Parcel data were initially developed to replace existing tax maps. As a result, there are parcel polygons digitized from tax maps that do not represent land parcels but are taxable entities such as leaseholds or easements.
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 HARN), US Survey foot units.
Today's Date
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, 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. 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.
1 Harrison Street SE, 2nd Floor
MS 65
Retention of attribute accuracy throughout the coverage to geodatabase feature class coversion process was ensured by a 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.
Topologically clean
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.
Retention of coordinate accuracy throughout the coverage to geodatabase feature class conversion process was ensured by a 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%.
Unknown
Data were compiled from plats and deeds recorded at the Clerk of the Court and from historic tax maps. Source material was digitized or the coordinates were entered into the database via ARC/INFO COGO.
This data set was part of a batch process that converted legacy data from ArcInfo coverage in Librarian to a single-tiled ArcInfo coverage in preparation for a final coversion to ArcSDE Geodatabase Feature Classes. Data were extracted from Librarian using the EXTRACT TOPOLOGICAL command. Multi-tiled data sets were extracted into multiple coverages and then combined based on the feature type(s). Layers with both polygon and arc feature classes were processed with the Arc commands, MAPJOIN and DISSOLVE. Arc feature classes alone were processed with the Arc commands, APPEND and DISSOLVE. Layers with both arc and point feature classes and point feature classes alone were processed with the Arc command, APPEND. When used, the Arc command, DISSOLVE, was given with the <#all> option. All coverages were then reprojected to HARN 83 using the following .prj file specifications: INPUT PROJECTION STATEPLANE UNITS FEET ZONE 5551 DATUM NAD27 NADCON PARAMETERS OUTPUT PROJECTION STATEPLANE UNITS FEET FIPSZONE 4501 DATUM HPGN NADCON PARAMETERS END This dataset was then converted to a feature class in a geodatabase in ArcSDE.
SDE Subdivision layer absorbed into Parcels layer for migration to ArcGIS 8.
Parcels participates in a SDE Feature Data Set Topology called LANDRECORDS.
9 digit unique parcel ID that is a combination of: MAP, CELL, and PARCEL.
Loudoun County
MAP: 3 digit map number (001-701) corresponding with map tile index. CELL: 2 digit map grid location of parcel center; the grid is comprised of 1000 by 1000 ft grid cells numbered as rows and columns (Columns numbered > 5 6 7 8 9 0; Rows numbered > 1 2 3 4). PARCEL: 4 digit location of polygon center based on the 1927 Virginia State Plane coordinate grid where an easting and northing measurement is taken. example: 6654 from: E 2229668 N475545.
Type of parcel.
Loudoun County
A sequential number assigned to units of a condominium phase
Loudoun County
Source material used to map a parcel
Loudoun County
Number of the plat assigned sequentially based on the year the plat was received.
Loudoun County
Lot number as recorded on the plat (no punctuation)
Loudoun County
The acreage of the parcel as calculated by the GIS
Loudoun County
The acreage as recorded in the deed or on the plat. Legal-acre for parcels mapped from tax maps may be incorrect.
Loudoun County
Percent of difference between GIS-ACRE & LEGAL-ACRE.
Loudoun County
Name of subdivision parcel is located in. If blank, then parcel is not located inside subdivision.
Loudoun County
Phase of subdivison that parcel is located in
Loudoun County
Section of subdivision that parcel is located in. If blank, then parcel is not located inside subdivision.
Loudoun County
Block of subdivision that parcel is located in. If blank, then parcel is not located inside subdivision.
Loudoun County
TEMPORARY field; Update Designation removed at completion
Loudoun County
The square foot as recorded in the deed or on the plat.
Loudoun County
Source by which feature class was created or modified
Loudoun County
Feature creation or modification date
Loudoun County
Not for public distribution. Internal User ID of editor who created or modified feature class. Intended to track and audit features internally by County
Loudoun County
Internal feature number.
ESRI
Feature geometry.
ESRI
Date that parcel is added to GIS
Loudoun County
Date that parcel is removed from GIS
Loudoun County
Area of parcel
Loudoun County
Perimeter of parcel
Loudoun County
PA_TYPE: Type of parcel.
Type Definition A Parcel in Loudoun but taxed in another county B Parcel adjacent to County boundary C Condominiums E Error M Parcel contains two or more tax numbers (eg, leaseholds) P Parcels R Road (MCPI = 0) W Water polygon (MCPI = 0) U Unknown
PA_SOURCE: Source material used to map a parcel
Source Definition C Cartographic License D Digitized from 1:2400 base map M Metes and Bounds P Digitized from plat T Digitized from tax map Z Unknown
PA_MAINT_FLAG:
Code Definition A T Z
PA_UPD_SOURCE: Source by which feature class was created or modified
Source Definition 0 Unknown 1 Legacy 2 County 3 Contract
1 Harrison Street SE, 2nd Floor
MS 65
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.
ESRI Personal Geodatabase Feature Class
ESRI Shapefile
AutoCad Digital Exchange File
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.
1 Harrison Street SE, 2nd Floor
MS 65