• Identification Information
• Data Quality Information
• Spatial Data Organization Information
• Spatial Reference Information
• Entity and Attribute Information
• Distribution Information
• Metadata Reference Information

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.

Identification Information:

Citation:

Citation information:

Originators: Loudoun County, VA, Office of Mapping and Geographic Information (OMAGI)

Title:

1 Meter Panchromatic (B&W) Digital Aerial Imagery Mosaic of Loudoun County, VA (Fall 1957-Spring 1958)

*File or table name: GISRSTR.GRSTR.B_W_1957

Publication date: January 007

*Geospatial data presentation form: SDE raster digital data

*Online linkage: see distribution information

Description:

Abstract:

This data set contains the 1957 and 1958 aerial imagery for the majority of Loudoun County, VA.  It is composed of United States Farm Service Agency (USDA FSA) hardcopy imagery, which were scanned, georeferenced, and mosaiced by Loudoun County OMAGI to produce digital representations.  Individual images cover approximately 15000' by 15000'.

Purpose:

This aerial imagery project was coordinated by the Loudoun County OMAGI and the Loudoun County Department of Building and Development. The backdrop image was developed as a historical reference, and has potential for land use/land cover change research, environmental resource investigations, and other temporal change analysis.

Supplemental information:

Data are stored in the corporate ArcSDE Geodatabase as a raster feature class.  SDE geotabase imagery is available in the County's GIS, whereas copies of source files are provided for public distribution.  
The coordinate system is Virginia State Plane (North), Zone 4501, datum NAD83 HARN.

*Language of dataset: en

Time period of content:

Time period information:

Range of dates/times:

Beginning date: 10211957

Ending date: 05211958

Currentness reference:

ground condition

Status:

Progress: Complete

Maintenance and update frequency: None planned

Spatial domain:

Bounding coordinates:

West bounding coordinate: -77.966047

East bounding coordinate: -77.308375

North bounding coordinate: 39.335831

South bounding coordinate: 38.836886

Local bounding coordinates:

*Left bounding coordinate: 11635725.900000

*Right bounding coordinate: 11815634.878403

*Top bounding coordinate: 7166508.300000

*Bottom bounding coordinate: 6992627.624545

Keywords:

Theme:

Theme keywords: Digital Orthophotography, Land Use, Land Cover, Miscellaneous, Planimetric, Economic Development, Environment, Wetlands, Infrastructure, Ground Transportation, Tourism, Recreation

Theme keyword thesaurus: None

Theme:

Theme keywords: imageryBaseMapsEarthCover

Theme keyword thesaurus: ISO19115

Place:

Place keywords: Virginia, Loudoun, County

Place keyword thesaurus: None

Access constraints: None

Use constraints:

These data were generated for use by Loudoun County and are available to the public.  Acknowledgement of USDA FSA and 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:

Contact information:

Contact organization primary:

Contact organization: Loudoun County, VA, OMAGI

Contact position: Base Map Cartographer

Contact address:

Address type: mailing and physical address

Address:

1 Harrison St. S.E., 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 - 5:00 EST, M-F

Data set credit:

1957/1958 Photography flown by United States Farm Service Agency

Security information:

Security classification system: Not Available

Security classification: Public

Security handling description: Not Available

*Native dataset format: SDE Raster Dataset

*Native data set environment:

Microsoft Windows 2000 Version 5.2 (Build 3790) Service Pack 2; ESRI ArcCatalog 9.2.5.1450

Data Quality Information:

Lineage:

Source information:

Source citation:

Citation information:

Originators: USDA FSA

Title:

QQ-01128 - Aerial Photography Services

Publication date: 09012006

Other citation details:

The United States Farm Services Agency produced black & white, aerial photo contact prints from 1957 and 1958. Loudoun County obtained these contact prints in 2006 and scanned them at 600 dpi, grayscale using a HP scanjet 7400c.

Type of source media: Hardcopy Aerial Photographs

Source time period of content:

Time period information:

Range of dates/times:

Beginning date: 10211957

Ending date: 05211958

Source currentness reference:

ground condition

Process step:

Process description:

Loudoun County obtained contact prints of the aerial photos flown by the United States Farm Service Agency in 1957 and 1958 that cover the county.

Process date: June 2006

Process contact:

Contact information:

Contact organization primary:

Contact organization: USDA FSA Aerial Photography Field Ofice

Contact address:

Address type: mailing address

Address:

2222 West 2300 South

City: Salt Lake City

State or province: UT

Postal code: 84119-2020

Contact voice telephone: 801.975.3503

Contact facsimile telephone: 801.975.3532

Contact electronic mail address: apfo.sales@apfo.usda.gov

Hours of service: 8:00 am - 4:30 pm EST, M - F

Process step:

Process description:

1.    Loudoun County scanned the contact prints using a HP scanjet 7400c. The images were scanned in grayscale to TIFF format at 600 dpi.  
 2.    The digital image files were then georeferenced to the 2005 1'                         Panchromatic DO of the County. 
 3.    The georeferenced files were mosaicked, using histogram matching                         techniques to correct color differences and improve the aesthetic                           quality of the data.
 4.    The mosaic is clipped according to a 50 foot buffer of the county. 
 5.    The final mosaic is in TIFF format with an ESRI compatible world file.

Spatial Data Organization Information:

*Direct spatial reference method: Raster

Raster object information:

*Image format: SDR

*Number of bands: 1

*Row count: 56967

*Column count: 58942

*Vertical count: 1

*Cell size X direction: 3.052305

*Cell size Y direction: 3.052305

*Bits per pixel: 8

*Pyramid layers: TRUE

*Image colormap: TRUE

*Compression type: LZ77

*Raster object type: Pixel

*Raster display type: pixel codes

*Raster origin: Upper Left

Spatial Reference Information:

Horizontal coordinate system definition:

Coordinate system name:

*Projected coordinate system name: NAD_1983_StatePlane_Virginia_North_FIPS_4501_Feet

*Geographic coordinate system name: GCS_North_American_1983

Planar:

Map projection:

*Map projection name: Lambert Conformal Conic

Lambert conformal conic:

*Standard parallel: 38.033333

*Standard parallel: 39.200000

*Longitude of central meridian: -78.500000

*Latitude of projection origin: 37.666667

*False easting: 11482916.666667

*False northing: 6561666.666667

Planar coordinate information:

*Planar coordinate encoding method: row and column

Coordinate representation:

*Abscissa resolution: 3.052305

*Ordinate resolution: 3.052305

*Planar distance units: survey feet

Geodetic model:

Horizontal datum name: North American Datum of 1983

Ellipsoid name: Geodetic Reference System 80

Semi-major axis: 6378137.000000

Denominator of flattening ratio: 298.257222

Vertical coordinate system definition:

Altitude system definition:

Altitude resolution: 1.000000

Altitude encoding method: Explicit elevation coordinates do not apply to this layer

Entity and Attribute Information:

Detailed description:

Entity type:

Entity type label: Band 1

Entity type definition:

Panchromatic 8-bit

Entity type definition source:

Scanned from print

Distribution Information:

Distributor:

Contact information:

Contact organization primary:

Contact organization: Loudoun County, VA, OMAGI

Contact address:

Address type: mailing and physical address

Address:

1 Harrison St. 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: 8:0 - 4:30 EST, M-F

Resource description: 1957 - 1958 Aerial Imagery

Distribution liability:

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:

Digital form:

Digital transfer information:

Format name: GeoTIFF 6.0

Format version number: GeoTIFF 6.0

File decompression technique: no compression applied

Fees: 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.

Ordering instructions:

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:

*Metadata date: 20091202

*Language of metadata: en

Metadata contact:

Contact information:

Contact organization primary:

Contact organization: Loudoun County, VA, OMAGI

Contact position: Metadata Specialist

Contact address:

Address type: REQUIRED: The mailing and/or physical address for the organization or individual.

City: REQUIRED: The city of the address.

State or province: REQUIRED: The state or province of the address.

Postal code: REQUIRED: The ZIP or other postal code of the address.

Contact voice telephone: 703.771.5778

*Metadata standard name: FGDC Content Standards for Digital Geospatial Metadata

*Metadata standard version: FGDC-STD-001-1998

*Metadata time convention: local time

Metadata access constraints: none

Metadata use constraints:

This metadata reflects the source Geodatabase format and specific elements may not apply if your data is exported to SHP or DXF. 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.

Metadata security information:

Metadata security classification system: Not availabe

Metadata security classification: Unclassified

Metadata security handling description:

Not Available

Metadata extensions:

*Online linkage: http://www.esri.com/metadata/esriprof80.html

*Profile name: ESRI Metadata Profile