Building Structures of Loudoun County, VA (2020)

Metadata:

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

Identification_Information:

Citation:

Citation_Information:

Publication_Date: 20210427

Title: Building Structures of Loudoun County, VA (2020)

Geospatial_Data_Presentation_Form: vector digital data

Description:

Abstract:

Building Footprints are a base map data layer derived by automated processes and processed for cartographic representation at 1:2400 scale. The polygon features represent the outlines of buildings and structures as seen from above and are mapped to National Map Accuracy Standards (NMAS).

Purpose:

Building footprints are used as reference points in the parcel mapping process and in address assignment. They are also used in the provision of emergency services.

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 NAVD88 , US Survey foot units.
OMAGI updates all base map data via photogrammetric process, using aerial imagery that is flown yearly. A different portion of the county is updated each year with the base map maintenance services contract, depending upon development patterns and update funding. The field “UPD_DATE” indicates the date a feature was last re-mapped. For a map of the most recent reviews and updates within the county, please click on https://arcg.is/0Tm9PW0

Status:

Maintenance_and_Update_Frequency: Annually

Progress: Complete

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -77.963079

East_Bounding_Coordinate: -77.321596

North_Bounding_Coordinate: 39.322176

South_Bounding_Coordinate: 38.837023

Keywords:

Theme:

Theme_Keyword_Thesaurus: none: Employee generated

Theme_Keyword:

building, structure, dwelling, footprint, house, commercial building

Theme:

Theme_Keyword_Thesaurus: ISO 19115 Topic Categories

Theme_Keyword: structure

Place:

Place_Keyword_Thesaurus: none: Employee generated

Place_Keyword: Virginia, Loudoun, County

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, OMAGI

Contact_Position: Base Map Coordinator

Contact_Address:

Address_Type: mailing and physical address

Address: 1 Harrison Street SE, 2nd Floor

Address: MS 65

City: Leesburg

State_or_Province: VA

Postal_Code: 20175

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

Point_of_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization:

Loudoun County, Virginia, Office of Mapping and Geographic Information (OMAGI)

Native_Data_Set_Environment:

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

Time_Period_of_Content:

Currentness_Reference: ground condition

Data_Quality_Information:

Lineage:

Source_Information:

Source_Citation:

Citation_Information:

Publication_Date: 20020403

Title: Base Map Maintenance Services Contract, QQ-00986, Phase I

Source_Scale_Denominator: 2400

Type_of_Source_Media: None

Source_Citation_Abbreviation: Base Map Maintenance Services Contract, QQ-00986, Phase I

Source_Contribution:

Captured Western 2/3 of County generally located north of Leesburg, west of Rt. 621, Evergreen Mills Rd, and south of Braddock Rd.

Source_Information:

Source_Citation:

Citation_Information:

Publication_Date: 20040402

Title: Base Map Maintenance Service Contract, QQ-00986, Phase II

Source_Scale_Denominator: 2400

Type_of_Source_Media: None

Source_Citation_Abbreviation: Base Map Maintenance Service Contract, QQ-00986, Phase II

Source_Contribution:

Captured Eastern 1/3 of County generally located to include Leesburg, east of Rt. 621, Evergreen Mills Rd, and north of Braddock Rd.

Source_Information:

Source_Citation:

Citation_Information:

Publication_Date: 20050404

Title: Base Map Maintenance Services Contract, QQ-00986, Phase III

Source_Scale_Denominator: 2400

Type_of_Source_Media: None

Source_Citation_Abbreviation: Base Map Maintenance Services Contract, QQ-00986, Phase III

Source_Contribution:

Captured photogrammetric stereo models covering highest development areas in the original Phase I region and including Leesburg.

Source_Information:

Source_Citation:

Citation_Information:

Publication_Date: 20070303

Title: Base Map Maintenance Services Contract, QQ-00986, Phase IV

Source_Scale_Denominator: 2400

Type_of_Source_Media: None

Source_Citation_Abbreviation: Base Map Maintenance Services Contract, QQ-00986, Phase IV

Source_Contribution:

Captured and updated photogrammetric stereo models covering highest development areas in the original Phase II region.

Source_Information:

Source_Citation:

Citation_Information:

Publication_Date: 20100302

Title: Base Map Maintenance Services Contract, QQ-01407, 2008

Source_Scale_Denominator: 2400

Type_of_Source_Media: None

Source_Citation_Abbreviation: Base Map Maintenance Services Contract, QQ-01407, 2008

Source_Contribution:

Captured and updated photogrammetric stereo models covering highest development areas in the north eastern region

Source_Information:

Source_Citation:

Citation_Information:

Publication_Date: 20090303

Title: Base Map Maintenance Services Contract, QQ-01407, 2008

Source_Scale_Denominator: 2400

Type_of_Source_Media: None

Source_Citation_Abbreviation: Base Map Maintenance Services Contract, QQ-01407, 2008

Source_Contribution:

Captured and updated photogrammetric stereo models covering areas in the central portion of the County

Source_Information:

Source_Citation:

Citation_Information:

Publication_Date: 20130514

Title: Base Map Maintenance Services Contract, QQ-01407, 2012

Source_Scale_Denominator: 2400

Type_of_Source_Media: None

Source_Citation_Abbreviation: Base Map Maintenance Services Contract, QQ-01407, 2012

Source_Contribution:

Captured and updated photogrammetric stereo models covering highest development areas in the western region.

Process_Step:

Process_Description:

Aerial film was acquired and imaged in 2002 (Virginia Base Mapping Program (VBMP) color) and 2004 (Loudoun County annual aerial mission (black & white). The imagery was scanned at 21 microns. Ground control used to support the compilation and was collected by identifying strategic locations on the aerial photography plan and then determining the coordinates by GPS ground survey techniques. The Aerial Triangulation was performed using softcopy workstations. Bundle adjustment was performed and Digital Elevation Models were created using and planimetric data were collected using standard photogrammetric collection techniques for breaklines and masspoints on soft copy workstations. Five foot contours were then generated from the compiled elevation data. Final deliverables in ESRI Interchange (E00) file format were placed on CD for delivery to OMAGI.

Process_Date: 20040427

Process_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Loudoun County, VA OMAGI

Process_Step:

Process_Description:

1. Legacy PGDB converted to DWG file. 2. DWG File imported to Microstation V8, and overlaid with the Update Parcels DGN. Identified Areas to be corrected. 3. Remap area inside parcel change layer a. If no change is detected the entities are not modified b. If new features are found they are collected as per the specifications c. If there is difference in shape or size of the planimetric, environmental or topographic features these are modified and coded as Update_Date = '2005' 4. Review remainder of model area outside the parcel change area a. If new features found they are collected as per the specifications 5. Updated Plan data in the Parcel areas have been checked for Edge matching 6. DTM was modified in the 11 major update areas 7. Contours were generated and edge matched with the legacy contour data 8. Checked contour coding at all the new buildings. 9. Checked the updated data on Ortho for completeness 10. All clean up tools have been run 11. Exported to Coverages and then to GDB. 12. Split the Area wise GDB into manageable pieces 13. Run QA/QC on each part of the Area wise GDB 14. Errors marked in the Log file have been corrected in the merged database 15. Merged the different Areas data into a single GDB i.e., Pilot, Areas 1, 2, & 4 16. Dissolved the polygons with same feature codes 17. Clipped legacy data to Phase 3 delivery boundary 18. Loaded new Phase 3 data and merged with existing Legacy data in east. 19. Loaded complete data sets (11) to enterprise SDE geodatabase

Process_Date: 20050425

Process_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Loudoun County, VA, OMAGI

Process_Step:

Process_Description:

Each of the Base Map Data Layer coverages in the 27 delivery blocks comprising Phases I and II were loaded into a single Geodatabase Feature Class using ArcGIS Simple Data Loader. The entire feature class was then dissolved using ArcToolBox Dissolve, such that any adjacent features with identical values in all attributes consolidated into one feature. Record Counts, Frequencies, Length or Area summaries and final Topology checks were performed throughout the conversion procedure to ensure that multiple coverage data input matched single feature class data output (per TYPE code). 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%

Process_Date: 20050427

Process_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Loudoun County, VA OMAGI

Process_Step:

Process_Description:

1. Legacy PGDB converted to DWG file. 2. DWG file imported to micro station V8 and overlaid with the area to be remapped. 3. New features were collected as per the data dictionary and the features that do not exist on 2007 imagery were deleted. 4. Modifications were done if there was a change in the shape and size of the features. 5. All the new and updated features were modified and coded as Update_Date= '2007'. 6. Updated data was checked for edge matching. 7. DTM was modified in the update area. 8. Contours were generated, coded and edge matched with the legacy contour data. 9. Spot Elevation Points were placed. 10. All clean up tools were run. 11. Data was exported to PGDB. 12. QA/ QC Program was run and reported errors were corrected. 13. Updated data was checked against Orthos for completeness. 14. All the delivery blocks were merged into a single PGDB. 15. Legacy PGDB was clipped to Phase 4 delivery boundary. 16. Updated Data was merged with the Legacy data. 17. Countywide complete dataset (11 layers) was loaded to enterprise SDE Geodatabase.

Process_Date: 20080610

Process_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Loudoun County, VA, OMAGI

Process_Step:

Process_Description:

1. Legacy PGDB converted to DWG file. 2. DWG file imported to micro station V8 and overlaid with the area to be updated. 3. New features were collected as per the data dictionary and the features that do not exist on 2008 imagery were deleted. 4. Modifications were done if there was a change in the shape and size of the features. 5. All the new and updated features were modified and coded as Update_Date= '2008'. 6. Updated data was checked for edge matching. 7. DTM was modified in the update area. 8. Contours were generated, coded and edge matched with the legacy contour data. 9. Spot Elevation Points were placed. 10. All clean up tools were run. 11. Data was exported to PGDB. 12. QA/ QC Program was run and reported errors were corrected. 13. Updated data was checked against Orthos for completeness. 14. All the delivery blocks were merged into a single PGDB. 15. Updated Data was merged with the Legacy data. 16. Countywide complete dataset (11 layers) was loaded to enterprise SDE Geodatabase.

Process_Date: 20090907

Process_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Loudoun County, VA, OMAGI

Process_Step:

Process_Description:

1. Legacy PGDB converted to DWG file. 2. DWG file imported to micro station V8 and overlaid with the area to be updated. 3. New features were collected as per the data dictionary and the features that do not exist on 2009 imagery were deleted. 4. Modifications were done if there was a change in the shape and size of the features. 5. All the new and updated features were modified and coded as Update_Date= '2009'. 6. Updated data was checked for edge matching. 7. DTM was modified in the update area. 8. Contours were generated, coded and edge matched with the legacy contour data. 9. Spot Elevation Points were placed. 10. All clean up tools were run. 11. Data was exported to PGDB. 12. QA/ QC Program was run and reported errors were corrected. 13. Updated data was checked against 2009 Orthos for completeness. 14. All the delivery blocks were merged into a single PGDB. 15. Updated Data was merged with the Legacy data. 16. Countywide complete dataset (11 layers) was loaded to enterprise SDE

Process_Date: 20101004

Process_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Loudoun County, VA, OMAGI

Process_Step:

Process_Description:

1. Legacy PGDB converted to DWG file. 2. DWG file imported to micro station V8 and overlaid with the area to be updated. 3. New features were collected as per the data dictionary and the features that do not exist on 2012 imagery were deleted. 4. Modifications were done if there was a change in the shape and size of the features. 5. All the new and updated features were modified and coded as Update_Date= '2012'. 6. Updated data was checked for edge matching. 7. DTM was modified in the update area. 8. Contours were generated, coded and edge matched with the legacy contour data. 9. Spot Elevation Points were placed. 10. All clean up tools were run. 11. Data was exported to PGDB. 12. QA/ QC Program was run and reported errors were corrected. 13. Updated data was checked against 2012 Orthos for completeness. 14. All the delivery blocks were merged into a single PGDB. 15. Updated Data was merged with the Legacy data. 16. Countywide complete dataset (11 layers) was loaded to enterprise SDE

Process_Date: 20130514

Process_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Loudoun County, VA, OMAGI

Source_Information:

Source_Citation_Abbreviation: Base Map Maintenance Services Contract, QQ-01407, 2013

Source_Scale_Denominator: 2400

Type_of_Source_Media: None

Source_Contribution:

Captured and updated photogrammetric stereo models covering selected areas in the central region of Loudoun County.

Source_Citation:

Citation_Information:

Title: Base Map Maintenance Services Contract, QQ-01857, 2014

Publication_Date: 20140514

Process_Step:

Process_Description:

1. Legacy PGDB converted to DWG file. 2. DWG file imported to micro station V8 and overlaid with the area to be updated. 3. New features were collected as per the data dictionary and the features that do not exist on 2013 imagery were deleted. 4. Modifications were done if there was a change in the shape and size of the features. 5. All the new and updated features were modified and coded as Update_Date= '2013'. 6. Updated data was checked for edge matching. 7. DTM was modified in the update area. 8. Contours were generated, coded and edge matched with the legacy contour data. 9. Spot Elevation Points were placed. 10. All clean up tools were run. 11. Data was exported to PGDB. 12. QA/ QC Program was run and reported errors were corrected. 13. Updated data was checked against 2013 Orthos for completeness. 14. All the delivery blocks were merged into a single PGDB. 15. Updated Data was merged with the Legacy data. 16. Countywide complete dataset (11 layers) was loaded to enterprise SDE

Process_Date: 20140514

Process_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Loudoun County, VA, OMAGI

Process_Step:

Process_Description:

1. Legacy PGDB converted to DWG file. 2. DWG file imported to micro station V8 and overlaid with the area to be updated. 3. New features were collected as per the data dictionary and the features that do not exist on 2014 imagery were deleted. 4. Modifications were done if there was a change in the shape and size of the features. 5. All the new and updated features were modified and coded as Update_Date= '2014'. 6. Updated data was checked for edge matching. 7. DTM was modified in the update area. 8. Contours were generated, coded and edge matched with the legacy contour data. 9. Spot Elevation Points were placed. 10. All clean up tools were run. 11. Data was exported to PGDB. 12. QA/ QC Program was run and reported errors were corrected. 13. Updated data was checked against 2014 Orthos for completeness. 14. All the delivery blocks were merged into a single PGDB. 15. Updated Data was merged with the Legacy data. 16. Countywide complete dataset (11 layers) was loaded to enterprise SDE

Process_Date: 20150803

Process_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Loudoun County, VA, OMAGI

Source_Information:

Source_Contribution:

Captured and updated photogrammetric stereo models covering selected areas in the central region of Loudoun County.

Source_Scale_Denominator: 2400

Type_of_Source_Media: None

Source_Citation_Abbreviation: Base Map Maintenance Services Contract, QQ-01857, 2014

Source_Citation:

Citation_Information:

Title: Base Map Maintenance Services Contract, QQ-01857, 2014

Publication_Date: 20150803

Source_Information:

Source_Contribution:

Captured and updated photogrammetric stereo models covering selected areas in the central region of Loudoun County.

Source_Citation_Abbreviation: Base Map Maintenance Services Contract, QQ-01857, 2014

Source_Scale_Denominator: 2400

Type_of_Source_Media: none

Source_Citation:

Citation_Information:

Title: Base Map Maintenance Services Contract, QQ-01857, 2015

Process_Step:

Process_Description:

1. Legacy PGDB converted to DWG file. 2. DWG file imported to micro station V8 and overlaid with the area to be updated. 3. New features were collected as per the data dictionary and the features that do not exist on 2015 imagery were deleted. 4. Modifications were done if there was a change in the shape and size of the features. 5. All the new and updated features were modified and coded as Update_Date= '2015'. 6. Updated data was checked for edge matching. 7. DTM was modified in the update area. 8. Contours were generated, coded and edge matched with the legacy contour data. 9. Spot Elevation Points were placed. 10. All clean up tools were run. 11. Data was exported to PGDB. 12. QA/ QC Program was run and reported errors were corrected. 13. Updated data was checked against 2015 Orthos for completeness. 14. All the delivery blocks were merged into a single PGDB. 15. Updated Data was merged with the Legacy data. 16. Countywide complete dataset (11 layers) was loaded to enterprise SDE

Process_Date: 20160824

Process_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Loudoun County, VA, OMAGI

Source_Information:

Source_Contribution:

Captured and updated photogrammetric stereo models covering selected areas in the central region of Loudoun County.

Source_Scale_Denominator: 2400

Type_of_Source_Media: none

Source_Citation_Abbreviation: Base Map Maintenance Services Contract, QQ-01857, 2016

Source_Citation:

Citation_Information:

Title: Base Map Maintenance Services Contract, QQ-01857, 2015

Process_Step:

Process_Description:

1. Legacy PGDB converted to DWG file. 2. DWG file imported to micro station V8 and overlaid with the area to be updated. 3. New features were collected as per the data dictionary and the features that do not exist on 2016 imagery were deleted. 4. Modifications were done if there was a change in the shape and size of the features. 5. All the new and updated features were modified and coded as Update_Date= '2016. 6. Updated data was checked for edge matching. 7. DTM was modified in the update area. 8. Contours were generated, coded and edge matched with the legacy contour data. 9. Spot Elevation Points were placed. 10. All clean up tools were run. 11. Data was exported to PGDB. 12. QA/ QC Program was run and reported errors were corrected. 13. Updated data was checked against 2016 Orthos for completeness. 14. All the delivery blocks were merged into a single PGDB. 15. Updated Data was merged with the Legacy data. 16. Countywide complete dataset (11 layers) was loaded to enterprise SDE

Process_Date: 20170804

Process_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Loudoun County, VA, OMAGI

Process_Step:

Process_Description:

1. Legacy PGDB converted to DWG file. 2. DWG file imported to micro station V8 and overlaid with the area to be updated. 3. New features were collected as per the data dictionary and the features that do not exist on 2017 imagery were deleted. 4. Modifications were done if there was a change in the shape and size of the features. 5. All the new and updated features were modified and coded as Update_Date= '2016. 6. Updated data was checked for edge matching. 7. DTM was modified in the update area. 8. Contours were generated, coded and edge matched with the legacy contour data. 9. Spot Elevation Points were placed. 10. All clean up tools were run. 11. Data was exported to PGDB. 12. QA/ QC Program was run and reported errors were corrected. 13. Updated data was checked against 2017 Orthos for completeness. 14. All the delivery blocks were merged into a single PGDB. 15. Updated Data was merged with the Legacy data. 16. Countywide complete dataset (11 layers) was loaded to enterprise SDE

Process_Date: 20181213

Process_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Loudoun County, VA, OMAGI

Source_Information:

Source_Citation:

Citation_Information:

Title: Base Map Maintenance Services Contract, QQ-01857, 2017

Source_Scale_Denominator: 2400

Type_of_Source_Media: none

Source_Citation_Abbreviation: Base Map Maintenance Services Contract, QQ-01857, 2017

Source_Contribution:

Captured and updated photogrammetric stereo models covering selected areas in the central region of Loudoun County.

Source_Information:

Source_Contribution:

Captured and updated photogrammetric stereo models covering selected areas in the northern region of Loudoun County.

Source_Citation:

Citation_Information:

Title: Contract # - QQ-01857, 2018

Source_Scale_Denominator: 2400

Type_of_Source_Media: none

Source_Citation_Abbreviation: Base Map Maintenance Services Contract, QQ-01857, 2018

Process_Step:

Process_Description:

1. Legacy PGDB converted to DWG file. 2. DWG file imported to micro station V8 and overlaid with the area to be updated. 3. New features were collected as per the data dictionary and the features that do not exist on 2018 imagery were deleted. 4. Modifications were done if there was a change in the shape and size of the features. 5. All the new and updated features were modified and coded as Update_Date= '2018. 6. Updated data was checked for edge matching. 7. DTM was modified in the update area. 8. Contours were generated, coded and edge matched with the legacy contour data. 9. Spot Elevation Points were placed. 10. All clean up tools were run. 11. Data was exported to PGDB. 12. QA/ QC Program was run and reported errors were corrected. 13. Updated data was checked against 2018 Orthos for completeness. 14. All the delivery blocks were merged into a single PGDB. 15. Updated Data was merged with the Legacy data. 16. Countywide complete dataset (11 layers) was loaded to enterprise SDE

Process_Date: 20190904

Process_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Loudoun County, VA, OMAGI

Source_Information:

Source_Scale_Denominator: 2400

Source_Citation_Abbreviation:

RFQ 108783, Agreement for Service for Base Map Maintenance Services, 2020

Source_Contribution:

Captured and updated photogrammetric stereo models covering selected areas in the Southeast region of Loudoun County.

Type_of_Source_Media: none

Source_Citation:

Citation_Information:

Title:

RFQ 108783, Agreement for Service for Base Map Maintenance Services, 2020

Publication_Date: 20210427

Process_Step:

Process_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Loudoun County, VA, OMAGI

Process_Description:

1. Legacy PGDB converted to DWG file. 2. DWG file imported to micro station V8 and overlaid with the area to be updated. 3. New features were collected as per the data dictionary and the features that do not exist on 2020 imagery were deleted. 4. Modifications were done if there was a change in the shape and size of the features. 5. All the new and updated features were modified and coded as Update_Date= '2020. 6. Updated data was checked for edge matching. 7. DTM was modified in the update area. 8. Contours were generated, coded and edge matched with the legacy contour data. 9. Spot Elevation Points were placed. 10. All clean up tools were run. 11. Data was exported to PGDB. 12. QA/ QC Program was run and reported errors were corrected. 13. Updated data was checked against 2020 Orthos for completeness. 14. All the delivery blocks were merged into a single PGDB. 15. Updated Data was merged with the Legacy data. 16. Countywide complete dataset (11 layers) was loaded to enterprise SDE

Process_Date: 20210427

Spatial_Data_Organization_Information:

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: 104299

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Planar:

Map_Projection:

Map_Projection_Name: Lambert Conformal Conic

Lambert_Conformal_Conic:

Standard_Parallel: 38.03333333333333

Standard_Parallel: 39.2

Longitude_of_Central_Meridian: -78.5

Latitude_of_Projection_Origin: 37.66666666666666

False_Easting: 11482916.66666666

False_Northing: 6561666.666666666

Planar_Coordinate_Information:

Planar_Coordinate_Encoding_Method: coordinate pair

Coordinate_Representation:

Abscissa_Resolution: 0.00020833333333333297

Ordinate_Resolution: 0.00020833333333333297

Geodetic_Model:

Horizontal_Datum_Name: D North American 1983 HARN

Ellipsoid_Name: GRS 1980

Semi-major_Axis: 6378137.0

Denominator_of_Flattening_Ratio: 298.257222101

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: GISDBB.GISBROW.BLDGS_POLY

Entity_Type_Definition: polygon feature class

Entity_Type_Definition_Source: ESRI

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: SHAPE

Attribute_Definition: Feature geometry.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain: Coordinates defining the features.

Attribute:

Attribute_Label: BL_SOURCE

Attribute_Definition: Source that created or edited feature class

Attribute_Definition_Source: Loudoun County

Attribute_Domain_Values:

Unrepresentable_Domain: See Entity and Attribute Detail Citation for Data Dictionary

Attribute:

Attribute_Label: BL_UPD_DATE

Attribute_Definition:

The date a feature was last re-mapped, although it may have been reviewed for changes more recently.

Attribute_Definition_Source: Loudoun County

Attribute:

Attribute_Label: BL_UPD_USER

Attribute_Definition:

Not for public distribution. Internal User ID of editor creating or modifying a feature. Intended to track and audit features internally by County.

Attribute_Definition_Source: Loudoun County

Attribute:

Attribute_Label: BL_TYPE

Attribute_Definition: Classification of Building Type

Attribute_Definition_Source: Loudoun County

Attribute_Domain_Values:

Unrepresentable_Domain: See Entity and Attribute Detail Citation for Data Dictionary

Attribute:

Attribute_Label: DB2GSE.ST_Area(SHAPE)

Attribute:

Attribute_Label: DB2GSE.SdeLength(SHAPE)

Overview_Description:

Entity_and_Attribute_Overview:

BL_TYPE: Designation of building type code description ---- ------------------ 1 Building 2 Ruins or Under Construction 50 Proposed Construction from DXF plats 99 Courtyard or "not building"

Entity_and_Attribute_Detail_Citation:

Feature Depiction Descriptions based on USACE publication, EM 1110-1-1000, July 31, 2002 and further developed according to Loudoun County Data Dictionary. Nominal Scale: 200 Feet per Inch
Building [Type = 1] "Building" are defined as any structures which resemble houses, sheds, warehouses, garages, silos, foundations, residential mobile homes, permanent commercial trailers, etc. Include covered porches, permanent over-hangs, carport roofs, etc. as part of the building. Include sheds and smokestacks are shown as buildings, if freestanding. Buildings must have minimum dimensions of 10' x 10' x 8' high. Do not capture decks, patios or "on site" trailers used temporarily for sales, construction, offices, storage, etc. ----------------------------------------------------------------- Ruin or Under Construction Building [Type = 2] Delineate visible building outlines, including foundation slabs or basement remains. ----------------------------------------------------------------- Proposed Construction (DXF) [Type = 50] Building structures captured from Digital Construction Plans ----------------------------------------------------------------- Courtyard or "not building" [Type = 99] ArcInfo coverage format requires "donut hole" features inside polygons, therefore a value has been assigned to courtyards or interior features otherwise not classified as a part of a building structure. This code does not exist in Geodatabase format.

Overview_Description:

Entity_and_Attribute_Overview: BL_SOURCE: Source that created or edited feature class

Entity_and_Attribute_Detail_Citation:

Code Description ---- ------------------ 1 Legacy (pre 2002) 2 County 3 Contract

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: 1 Harrison Street SE, 2nd Floor

Address: MS 65

City: Leesburg

State_or_Province: VA

Postal_Code: 20175

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: GDB

Format_Specification: ESRI Geodatabase Feature Class

Digital_Transfer_Option:

Offline_Option:

Offline_Media: dvd

Fees:

Loudoun County distributes spatial data in ArcGIS database or shapefile or DXF format. Selected aerial imagery is also available.

Ordering_Instructions:

Visit our website at: <http://www.loudoun.gov/omagi> and click on "Maps and Data."  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: 20210427

Metadata_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Loudoun County, Virginia, OMAGI

Contact_Position: Base Map Coordinator

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, DXF, or .e00 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.