Airport Impact (AI) Overlay District of Loudoun County, Virginia (1993)
Metadata also available as
Metadata:
- Identification_Information:
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- Citation:
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- Citation_Information:
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- Originator: Loudoun County, Virginia - Department of Building & Development
- Title:
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Airport Impact (AI) Overlay District of Loudoun County, Virginia (1993)
- Geospatial_Data_Presentation_Form: vector digital data
- Publication_Information:
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- Publication_Place: Leesburg, VA
- Publisher: Loudoun County, VA
- Online_Linkage: see distribution information
- Description:
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- Abstract:
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The Airport Impact (AI) Overlay District is a zoning overlay district administered by the Loudoun County Department of Building and Development. The Department is responsible for all development approvals, review procedures, modifications and density calculations in the AI as governed by Article IV, Division C: "Environmental Impact Districts", Section 4-1400 of the Revised 1993 Zoning Ordinance. The Airport Impact (AI) Overlay District boundaries shall be based on the 60dB and 65dB Loudness Day Night (LDN) noise contours and a one-mile buffer that extends beyond the 60dB LDN contour for Washington-Dulles International Airport and the Leesburg Municipal Airport (Godfrey Field). The Board of Supervisors for Loudoun County, Virginia shall use as a basis for delineating the LDN noise contours the following sources: (1) Washington Dulles International Airport: The FAA PART 150 Noise Compatibility Programs, Washington Dulles International Airport, August, 1992, and (2) Leesburg Municipal Airport: Environmental Assessment Report. October, 1985.
- Purpose:
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The Airport Impact (AI) Overlay District is established to acknowledge the unique land impacts of airports, regulate the siting of noise sensitive uses, ensure that the heights of structures are compatible with airport operations, and complement Federal Aviation Administration regulations regarding noise and height.
- Supplemental_Information:
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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.
- Time_Period_of_Content:
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- Time_Period_Information:
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- Single_Date/Time:
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- Calendar_Date: 20090101
- Currentness_Reference: publication date
- Status:
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- Progress: Complete
- Maintenance_and_Update_Frequency: As needed
- Spatial_Domain:
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- Bounding_Coordinates:
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- West_Bounding_Coordinate: -77.605361
- East_Bounding_Coordinate: -77.407248
- North_Bounding_Coordinate: 39.110283
- South_Bounding_Coordinate: 38.820530
- Keywords:
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- Theme:
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- Theme_Keyword_Thesaurus: None
- Theme_Keyword: Godfrey Field
- Theme_Keyword: LDN
- Theme_Keyword: buffer
- Theme_Keyword: ordinance
- Theme_Keyword: zoning
- Theme_Keyword: Dulles
- Theme_Keyword: noise
- Theme_Keyword: airport
- Theme_Keyword: loudness
- Theme_Keyword: decibel level
- Theme:
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- Theme_Keyword_Thesaurus: ESRI ArcIMS Topic Categories
- Theme_Keyword: Boundaries
- Theme_Keyword: Health
- Place:
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- Place_Keyword_Thesaurus: None
- Place_Keyword: County
- Place_Keyword: Loudoun
- Place_Keyword: Dulles
- Place_Keyword: Leesburg
- Place_Keyword: Virginia
- Access_Constraints: None
- Use_Constraints:
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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.
- Point_of_Contact:
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- Contact_Information:
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- Contact_Organization_Primary:
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- Contact_Organization: Loudoun County, VA - Department of Building & Development
- Contact_Position: GIS Administrator
- Contact_Address:
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- Address_Type: mailing and physical
- Address: MS 60
- Address: 1 Harrison St. SE, 2nd Floor
- City: Leesburg
- State_or_Province: VA
- Postal_Code: 20175
- Country: US
- Contact_Voice_Telephone: (703)777-0397
- Contact_Facsimile_Telephone: (703)771-5215
- Contact_Electronic_Mail_Address: bad@loudoun.gov
- Hours_of_Service: 8:30-5:00 EST, M-F
- Native_Data_Set_Environment: Version 6.2 (Build 9200) ; Esri ArcGIS 10.5.0.6491
- Data_Quality_Information:
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- Attribute_Accuracy:
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- Attribute_Accuracy_Report:
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Retention of attribute 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, on a record by record basis, identical attribution when comparing all concatenated fields to all the user-defined attribution.
- Logical_Consistency_Report: Topologically clean
- Completeness_Report:
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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.
- Positional_Accuracy:
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- Horizontal_Positional_Accuracy:
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- Horizontal_Positional_Accuracy_Report:
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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%.
- Lineage:
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- Source_Information:
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- Source_Citation:
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- Citation_Information:
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- Originator: Peat, Marwick, Mitchell, and Co
- Originator:
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Metropolitan Washington Airport Authority (MWAA) / Federal Aviation Administration
- Publication_Date: 19850101
- Title:
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Final Report Part 150 Noise Compatibility Program, Washington Dulles International Airport (Part 150 Report).
- Type_of_Source_Media: None
- Source_Time_Period_of_Content:
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- Time_Period_Information:
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- Single_Date/Time:
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- Calendar_Date: 19850101
- Source_Currentness_Reference: publication date
- Source_Citation_Abbreviation:
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Final Report Part 150 Noise Compatibility Program, Washington Dulles International Airport (Part 150 Report).
- Source_Contribution: Created noise contours
- Source_Information:
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- Source_Citation:
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- Citation_Information:
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- Originator:
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Metropolitan Washington Airport Authority (MWAA) / Federal Aviation Administration
- Originator: Peat, Marwick, Mitchell, and Co.
- Publication_Date: 19920101
- Title:
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FAA Part 150 Noise Compatibility Programs, Washington Dulles International Airport, August 1992, report
- Type_of_Source_Media: None
- Source_Time_Period_of_Content:
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- Time_Period_Information:
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- Single_Date/Time:
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- Calendar_Date: 19920101
- Source_Currentness_Reference: publication date
- Source_Citation_Abbreviation:
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FAA Part 150 Noise Compatibility Programs, Washington Dulles International Airport, August 1992, report
- Source_Contribution: New noise contours created
- Process_Step:
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- Process_Description:
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The Aviation Safety and Noise Abatement Act of 1979 (Public Law 96-193) called for the study of aircraft noise around American airports. Section 105 of this Act required the Metropolitan Washington Airport Authority (MWAA) to establish a noise exposure map and noise compatibility planning for Dulles Airport (Aircraft Noise Exposure Map and Land Use Compatibility Program, Peat, Marwick, Mitchell & Co., 1981). In 1982, the FAA commissioned Peat, Marwick, Mitchell, and Co. as consultants to prepare a noise impact study as part of the Airport Master Plan update. The Final Report Part 150 Noise Compatibility Program, Washington Dulles International Airport (Part 150 Report) was issued in January 1985. Noise contour maps for the existing conditions (1982 data) and forecasted conditions (1985, 1990, and 2000) were created for the 1985 report
- Process_Date: 19850101
- Process_Contact:
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- Contact_Information:
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- Contact_Organization_Primary:
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- Contact_Organization: Loudoun County, VA, Department of Building & Development
- Contact_Position: GIS Administrator
- Process_Step:
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- Process_Description:
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The Aircraft Noise Contour Policies Revisions, Comprehensive Plan Amendment (CPAM 1992-0008), adopted by the Board of Supervisors on January 6, 1993 revised the County's 1991 Choices and Changes General Plan's airport noise policies. New noise contours were developed using those identified in the FAA Part 150 Noise Compatibility Programs, Washington Dulles International Airport, August 1992, report.
- Process_Date: 19920101
- Process_Contact:
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- Contact_Information:
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- Contact_Organization_Primary:
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- Contact_Organization: Loudoun County, VA, Department of Building & Development
- Contact_Position: GIS Administrator
- Process_Step:
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- Process_Description:
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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 conversion 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 HARN83 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 The dataset was then converted to a feature class in a geodatabase in ArcSDE.
- Process_Date: 20040101
- Process_Contact:
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- Contact_Information:
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- Contact_Organization_Primary:
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- Contact_Organization:
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Loudoun County, VA, Office of Mapping and Geographic Information (OMAGI)
- Contact_Position: GIS System Analyst
- Process_Step:
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- Process_Description:
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Layer edited to add a new & correct noise zone description from Zoning Ordinance
- Process_Date: 20191206
- Spatial_Data_Organization_Information:
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- Indirect_Spatial_Reference: Loudoun County
- Direct_Spatial_Reference_Method: Vector
- Point_and_Vector_Object_Information:
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- SDTS_Terms_Description:
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- SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains
- Point_and_Vector_Object_Count: 13
- Spatial_Reference_Information:
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- Horizontal_Coordinate_System_Definition:
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- Planar:
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- Map_Projection:
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- Map_Projection_Name: NAD 1983 HARN StatePlane Virginia North FIPS 4501 Feet
- Lambert_Conformal_Conic:
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- 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:
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- Planar_Coordinate_Encoding_Method: coordinate pair
- Coordinate_Representation:
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- Abscissa_Resolution: 0.0003280833333333333
- Ordinate_Resolution: 0.0003280833333333333
- Planar_Distance_Units: foot_us
- Geodetic_Model:
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- 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:
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- Detailed_Description:
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- Entity_Type:
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- Entity_Type_Label: LDN_POLY
- Entity_Type_Definition: Polygon Feature Class
- Entity_Type_Definition_Source: ESRI
- Attribute:
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- Attribute_Label: LD_UPD_SOURCE
- Attribute_Definition: Source that created or modified feature class
- Attribute_Definition_Source: Loudoun County
- Attribute_Domain_Values:
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- Enumerated_Domain:
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- Enumerated_Domain_Value: See Overview Description for data dictionary of attribute
- Attribute:
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- Attribute_Label: LD_LOCATION
- Attribute_Definition: Location of LDN polygon
- Attribute_Definition_Source: Loudoun County
- Attribute_Domain_Values:
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- Enumerated_Domain:
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- Enumerated_Domain_Value: See Overview Description for data dictionary of attribute
- Attribute:
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- Attribute_Label: OBJECTID
- Attribute_Definition: Internal feature number.
- Attribute_Definition_Source: ESRI
- Attribute_Domain_Values:
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- Unrepresentable_Domain:
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Sequential unique whole numbers that are automatically generated.
- Attribute:
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- Attribute_Label: LD_UPD_USER
- Attribute_Definition:
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Not for public distribution. Internal User ID of editor creating or modifying a feature.
- Attribute_Definition_Source: Loudoun County
- Attribute:
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- Attribute_Label: LD_DESCRIPTION
- Attribute_Definition: Old description of noise zone (no longer use)
- Attribute_Definition_Source: Loudoun County
- Attribute_Domain_Values:
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- Unrepresentable_Domain: User generated text
- Attribute:
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- Attribute_Label: LD_DESCRIPTION_ORD
- Attribute_Definition: Correct description of noise zone
- Attribute_Definition_Source: Loudoun County
- Attribute_Domain_Values:
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- Unrepresentable_Domain: Noise zone description from Loudoun County Zoning Ordinance
- Attribute:
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- Attribute_Label: LD_NOISEZONE
- Attribute_Definition:
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Buffer zone around airports corresponding to decibel level of noise
- Attribute_Definition_Source: Loudoun County
- Attribute_Domain_Values:
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- Enumerated_Domain:
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- Enumerated_Domain_Value: See Overview Description for data dictionary of attribute
- Attribute:
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- Attribute_Label: SHAPE
- Attribute_Definition: Feature geometry.
- Attribute_Definition_Source: ESRI
- Attribute_Domain_Values:
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- Unrepresentable_Domain: Coordinates defining the features.
- Attribute:
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- Attribute_Label: LD_UPD_DATE
- Attribute_Definition: Date feature class created or modified
- Attribute_Definition_Source: Loudoun County
- Attribute_Domain_Values:
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- Unrepresentable_Domain: User generated text
- Attribute:
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- Attribute_Label: SHAPE_Length
- Attribute_Definition: Length of feature in internal units.
- Attribute_Definition_Source: Esri
- Attribute_Domain_Values:
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- Unrepresentable_Domain: Positive real numbers that are automatically generated.
- Attribute:
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- Attribute_Label: SHAPE_Area
- Attribute_Definition: Area of feature in internal units squared.
- Attribute_Definition_Source: Esri
- Attribute_Domain_Values:
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- Unrepresentable_Domain: Positive real numbers that are automatically generated.
- Overview_Description:
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- Entity_and_Attribute_Overview: LD_LOCATION: Location of LDN polygon
- Entity_and_Attribute_Detail_Citation:
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LOCATION: Description dulles-fairfax Dulles International Airport in Fairfax County dulles-loudoun Dulles International Airport in Loudoun County leesburg Leesburg Municipal Airport in Town of Leesburg
- Overview_Description:
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- Entity_and_Attribute_Overview:
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LD_NOISEZONE: Buffer zone around airports corresponding to decibel level of noise
- Entity_and_Attribute_Detail_Citation:
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Zone Description Ldn60 loudness day/night level of 60dB Ldn601milebuffer 1 mile buffer around ldn60 zone Ldn65 loudness day/night level of 65dB
- Overview_Description:
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- Entity_and_Attribute_Overview: LD_UPD_SOURCE: Source that created or modified feature class
- Entity_and_Attribute_Detail_Citation:
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Source Definition 0 Undetermined 1 Legacy (pre 2002) 2 County 3 Contract
- Distribution_Information:
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- Distributor:
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- Contact_Information:
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- Contact_Organization_Primary:
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- Contact_Organization: Loudoun County, VA, OMAGI
- Contact_Position: Public Information Counter
- Contact_Address:
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- Address_Type: mailing
- Address: 1 Harrison Street, S.E. 2nd Floor
- Address: MS 65
- City: Leesburg
- State_or_Province: VA
- Postal_Code: 20175
- Country: US
- 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:
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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.
- Standard_Order_Process:
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- Digital_Form:
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- Digital_Transfer_Information:
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- Format_Name: GDB
- Format_Specification: ESRI Geodatabase Feature Class
- Digital_Transfer_Option:
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- Offline_Option:
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- Offline_Media: dvd
- Offline_Option:
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- Offline_Media: dvd
- Offline_Option:
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- Offline_Media: dvd
- Fees:
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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.
- Ordering_Instructions:
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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.
- Metadata_Reference_Information:
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- Metadata_Date: 20191206
- Metadata_Contact:
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- Contact_Information:
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- Contact_Organization_Primary:
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- Contact_Organization: Loudoun County, VA, OMAGI
- Contact_Position: Metadata Specialist
- Contact_Address:
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- Address_Type: mailing and physical
- Address: MS 65
- Address: 1 Harrison Street S.E., 2nd Floor
- City: Leesburg
- State_or_Province: VA
- Postal_Code: 20175
- Country: US
- Contact_Voice_Telephone: (703)771-5778
- Contact_Facsimile_Telephone: (703)771-5075
- Contact_Electronic_Mail_Address: mapping@loudoun.gov
- Hours_of_Service: Monday - Friday 8:00 - 4:30 EST
- 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:
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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.
Generated by mp version 2.9.12 on Fri Dec 06 14:12:45 2019