Loudoun County, VA, Office of Mapping and Geographic Information (OMAGI)
present
County Boundary of Loudoun County, VA
vector digital data
Leesburg, VA
Loudoun County, VA
GISDBB.GISBROW.COUNTY_POLY
withheld
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.
en
present
publication date
As needed
-77.963439
-77.323973
39.326230
38.844263
11635727.443333
11815632.111667
6992630.695000
7166506.778333
none
Virginia
Loudoun
County
Boundary, Survey
none
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.
Loudoun County, VA, OMAGI
Parcel Coordinator
mailing and physical address
1 Harrison Street SE, 2nd Floor
MS 65
Leesburg
VA
20175
USA
(703)771-5778
(703)771-5075
mapping@loudoun.gov
8:00-4:30 EST, M-F
Public Information
ESRI ArcCatalog 9.3.1.4000
Feature Class
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%.
Loudoun County, VA, OMAGI
1994
2400
mylar
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
1994
Loudoun County, VA, OMAGI
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.
2004
OMAGI
GIS Analyst
County participates in a SDE Feature Data Set Topology called LANDRECORDS.
Current
Loudoun County, VA, OMAGI
Parcel Coordinator
Loudoun County
Vector
Simple
FALSE
0
TRUE
FALSE
coordinate pair
0.000208
0.000208
survey feet
D_North_American_1983_HARN
Geodetic Reference System 80
6378137.000000
298.257222
GCS_North_American_1983_HARN
NAD_1983_HARN_StatePlane_Virginia_North_FIPS_4501_Feet
Explicit elevation coordinates do not apply to this layer
0.250000
Not Applicable
Not Applicable
COUNTY_POLY
Polygon feature class
ESRI
Feature Class
0
OBJECTID
OBJECTID
OID
4
0
0
Internal feature number.
ESRI
Sequential unique whole numbers that are automatically generated.
CO_COUNTY
Unknown
CO_COUNTY
String
3
0
0
Loudoun County
CO_ED
Unknown
CO_ED
SmallInteger
2
0
0
Loudoun County
CO_UPD_SOURCE
Source by which feature class was created or modified
Loudoun County
See Overview Description for data dictionary of attribute
CO_UPD_SOURCE
SmallInteger
2
0
0
CO_UPD_DATE
Feature creation or modification date
Loudoun County
CO_UPD_DATE
Date
8
0
0
CO_UPD_USER
Not for public distribution. Internal User ID of editor creating or modifying a feature
Loudoun County
CO_UPD_USER
SmallInteger
2
0
0
SHAPE
Shape
Geometry
0
0
0
Feature geometry.
ESRI
Coordinates defining the features.
SHAPE_Length
SHAPE_Length
Double
8
0
0
Length of feature in internal units.
Esri
Positive real numbers that are automatically generated.
SHAPE_Area
SHAPE_Area
Double
8
0
0
Area of feature in internal units squared.
Esri
Positive real numbers that are automatically generated.
CO_UPD_SOURCE: source by which feature class was created or modified
Source Definition
0 Undetermined
1 Legacy 2 County
3 Contract
Loudoun County, VA, OMAGI
Public Information Counter
mailing and physical address
1 Harrison Street SE, 2nd Floor
MS 65
Leesburg
VA
20175
USA
(703)771-5778
(703)771-5075
mapping@loudoun.gov
8:00-4:30 EST, M-F
Offline Data
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.
GDB
ESRI Personal Geodatabase Feature Class
0.759
DVD
SHP
ESRI Shapefile
DVD
DXF
AutoCad Digital Exchange File
DVD
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.
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.
20111020
mailing and physical address
1 Harrison Street SE., 2nd Floor
MS 65
Leesburg
VA
20175
USA
(703)771-5778
(703)771-5075
mapping@loudoun.gov
8:00-4:30 EST, M-F
Loudoun County, VA, OMAGI
Metadata Specialist
FGDC Content Standards for Digital Geospatial Metadata
FGDC-STD-001-1998
local time
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.
en
20140804
19401200
FALSE
20191118
10202100
20191118
10202100
COUNTY_POLY
002
11635727.443333
11815632.111667
6992630.695000
7166506.778333
1
Projected
GCS_North_American_1983_HARN
Linear Unit: Foot_US (0.304801)
NAD_1983_HARN_StatePlane_Virginia_North_FIPS_4501_Feet
<ProjectedCoordinateSystem xsi:type='typens:ProjectedCoordinateSystem' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xmlns:xs='http://www.w3.org/2001/XMLSchema' xmlns:typens='http://www.esri.com/schemas/ArcGIS/10.7'><WKT>PROJCS["NAD_1983_HARN_StatePlane_Virginia_North_FIPS_4501_Feet",GEOGCS["GCS_North_American_1983_HARN",DATUM["D_North_American_1983_HARN",SPHEROID["GRS_1980",6378137.0,298.257222101]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Lambert_Conformal_Conic"],PARAMETER["False_Easting",11482916.66666666],PARAMETER["False_Northing",6561666.666666666],PARAMETER["Central_Meridian",-78.5],PARAMETER["Standard_Parallel_1",38.03333333333333],PARAMETER["Standard_Parallel_2",39.2],PARAMETER["Latitude_Of_Origin",37.66666666666666],UNIT["Foot_US",0.3048006096012192],AUTHORITY["EPSG",2924]]</WKT><XOrigin>-110512499.99999979</XOrigin><YOrigin>-88857999.999999836</YOrigin><XYScale>4800.0000000000082</XYScale><ZOrigin>-100000</ZOrigin><ZScale>10000</ZScale><MOrigin>-100000</MOrigin><MScale>10000</MScale><XYTolerance>0.0033333333333333275</XYTolerance><ZTolerance>0.001</ZTolerance><MTolerance>0.001</MTolerance><HighPrecision>true</HighPrecision><WKID>2924</WKID><LatestWKID>2924</LatestWKID></ProjectedCoordinateSystem>
Published
FGDC
1.0
Version 6.2 (Build 9200) ; Esri ArcGIS 10.7.1.11595
County Boundary of Loudoun County, VA
11635727.443333
11815632.111667
7166506.778333
6992630.695
1
-77.963439
-77.323973
39.32623
38.844263
1
1
-77.963439
-77.323973
39.326230
38.844263
The boundary defines the extent of the County's jurisdiction.
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>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.</SPAN></P></DIV></DIV></DIV>
boundaries
Boundary
Survey
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.
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.
none; Employee generated
Boundary, Survey
none; Employee generated
Virginia, Loudoun, County
Loudoun County, VA, OMAGI
Parcel Coordinator
1 Harrison Street SE, 2nd Floor
Leesburg
VA
20175
mapping@loudoun.gov
MS 65
(703)771-5778
(703)771-5075
8:00-4:30 EST, M-F
ArcGIS Metadata
1.0
dataset
Tiles
GDB
ESRI Personal Geodatabase Feature Class
Loudoun County, VA, OMAGI
Public Information Counter
1 Harrison Street SE
Leesburg
VA
20175
mapping@loudoun.gov
MS 65
(703)771-5778
(703)771-5075
8:00-4:30 EST, M-F
SHP
ESRI Shapefile
DXF
AutoCad Digital Exchange File
Loudoun County distributes spatial data in ArcGIS coverage or shapefile format for the cost of reproduction. Countywide spatial datasets may be purchased for $21 per CD or $22 per DVD for up to 650 MB or 4.5 GB of data, respectively. There is a $10 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.
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.
File Geodatabase Feature Class
NAD_1983_HARN_StatePlane_Virginia_North_FIPS_4501_Feet
EPSG
8.9.3(9.0.0)
0
20191118
{680B1D26-F3D9-42DB-AE24-954333D4BA41}
Loudoun County, VA OMAGI
Parcel Coordinator
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.
2400
1994-01-01T00:00:00
Loudoun County, VA, OMAGI
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
1994-01-01T00:00:00
Loudoun County, VA, OMAGI
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.
2004-01-01T00:00:00
Loudoun County, VA, OMAGI
GIS Analyst
County participates in a SDE Feature Data Set Topology called LANDRECORDS.
Loudoun County, VA, OMAGI
Parcel Coordinator