| County Boundary of Loudoun County, VA | |
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Data format: SDE Feature Class File or table name: GISDBB.GISBROW.COUNTY_POLY Coordinate system: Lambert Conformal Conic Theme keywords: boundaries, Boundary, Survey |
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Abstract:
Loudoun County was founded and surveyed in 1757. Loudoun's boundary with Maryland is the mean low water mark of the Potomac River on the Virginia side; it has not been surveyed. Loudoun's boundary with Prince William County is the Bull Run Creek. The border has not been modified for recent surveys. Individual plats along the Potomac and Bull Run Rivers have not resulted in a change in the border along those rivers- since measurements of the waters edge vary seasonally and the County Boundary needs to be seamless and constant.
Many decades ago tax commissioners from surrounding jurisdictions assigned parcels to one jurisdiction or another rather than splitting parcels. Currently there is a mix of parcels split by a County Boundary, parcels taxed entirely in Loudoun, and portions of parcels within the County but taxed by another jurisdiction. The Assessor's office dictates how these parcels are taxed, as do other jusidictions.
In 1957, the boundary with Fairfax County was re-established and finalized. The boundary with Fauquier County was surveyed and monumented in 1966. The boundary with Clarke County was surveyed in 1989, and the boundary survey with Jefferson County West Virginia was completed in 1998. The West Virginia, Fairfax, Fauquier, and Clarke boundary arcs were created by generating coverages from the monument coordinates using the generate command. |
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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.
Loudoun County was founded and surveyed in 1757. Loudoun's boundary with Maryland is the mean low water mark of the Potomac River on the Virginia side; it has not been surveyed. Loudoun's boundary with Prince William County is the Bull Run Creek. The border has not been modified for recent surveys. Individual plats along the Potomac and Bull Run Rivers have not resulted in a change in the border along those rivers- since measurements of the waters edge vary seasonally and the County Boundary needs to be seamless and constant.
Many decades ago tax commissioners from surrounding jurisdictions assigned parcels to one jurisdiction or another rather than splitting parcels. Currently there is a mix of parcels split by a County Boundary, parcels taxed entirely in Loudoun, and portions of parcels within the County but taxed by another jurisdiction. The Assessor's office dictates how these parcels are taxed, as do other jusidictions.
In 1957, the boundary with Fairfax County was re-established and finalized. The boundary with Fauquier County was surveyed and monumented in 1966. The boundary with Clarke County was surveyed in 1989, and the boundary survey with Jefferson County West Virginia was completed in 1998. The West Virginia, Fairfax, Fauquier, and Clarke boundary arcs were created by generating coverages from the monument coordinates using the generate command.
The boundary defines the extent of the County's jurisdiction.
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.
publication 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%.
Survey monument records taken from boundary survey records. The following monument coordinates are taken from the surveys; this information was provided as part of the boundary surveys. Loudoun/Clarke 0,2190457.5375,534415.2371 1,2189282.4452,532660.6804 2,2188342.8126,531990.7437 3,2187475.0966,530577.1721 4,2186103.2250,529797.2270 5,2183330.0729,522957.9724 6,2182770.7822,519959.9605 7,2180802.6771,515639.1888 8,2177645.7450,515314.5616 9,2176616.9058,514540.5421 10,2173752.9732,509633.6350 11,2172218.8589,506273.3604 12,2170575.9334,505348.8968 13,2168400.4646,502736.4507 14,2165336.4087,500270.4693 15,2162740.6111,498880.9529 16,2161868.8858,497033.6518 17,2158673.7650,494550.1057 18,2156785.6247,494004.0742 19,2154367.7893,493570.8928 100,2152734.1316,490966.6277 end Loudoun/Fauquier 99,2152934.34,491287.56 100,2152731.48,490965.79 1,2153022.25,490881.96 2,2162198.89,488236.27 3,2163655.30,487816.38 4,2168319.40,486471.69 5,2170021.05,485981.09 6,2175996.57,484258.30 7,2180811.92,482870.00 8,2188192.22,480742.21 9,2191392.78,479819.47 10,2195489.21,478638.44 11,2198406.92,477797.24 12,2203440.49,476346.02 13,2208433.76,474906.43 14,2210369.48,474348.35 15,2215903.14,472752.95 16,2220792.80,471343.23 17,2228380.40,469155.67 18,2231946.49,468127.54 19,2234981.32,467252.58 20,2240217.76,465742.88 21,2240488.46,465664.83 101,2240681.73,465609.11 102,2214250.16,478891.12 103,2178336.48,482719.19 end Loudoun/Fairfax 1,2273134.75,429590.06 2,2274474.173,431369.498 3,2274534.92,431450.20 4,2332630.47,508631.12 end
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.
County participates in a SDE Feature Data Set Topology called LANDRECORDS.
Internal feature number.
ESRI
Unknown
Loudoun County
Unknown
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 creating or modifying a feature
Loudoun County
Feature geometry.
ESRI
CO_UPD_SOURCE: source by which feature class was created or modified
Source Definition 0 Undetermined 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