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Service Description: Loudoun County has collected aerial imagery for many years. While imagery has been captured in digital format since the mid-2000s, prior years were captured with film cameras. Rolls of film from previous years were available at the County in film canisters, but unavailable for viewing on modern digital GIS systems. The County initiated a project to have these film rolls scanned into a digital format. The film was then processed using modern photogrammetric techniques to produce a digital orthomosaic of the County. Images from 1979, 1986, 1988, 1990-2007 were processed and delivered as tiled uncompressed GeoTIFF and MrSID mosaic formats. 1979, 1986, and 1988 were captured and produced as color (R,G,B) images, while the remainder were captured and produced as panchromatic (B/W) images. The MrSID mosaics use a 50:1 compression ratio. Approximate seamline locations containing the scan name attribute have also been provided. The aerial imagery generally encompasses the full land area of the County of Loudoun, VA. Images were flown in varying temporal and ground conditions and will exhibit some variation in tone, quality, and positional accuracy.

Name: Aerial/COLOR_1979

Description: Loudoun County has collected aerial imagery for many years. While imagery has been captured in digital format since the mid-2000s, prior years were captured with film cameras. Rolls of film from previous years were available at the County in film canisters, but unavailable for viewing on modern digital GIS systems. The County initiated a project to have these film rolls scanned into a digital format. The film was then processed using modern photogrammetric techniques to produce a digital orthomosaic of the County. Images from 1979, 1986, 1988, 1990-2007 were processed and delivered as tiled uncompressed GeoTIFF and MrSID mosaic formats. 1979, 1986, and 1988 were captured and produced as color (R,G,B) images, while the remainder were captured and produced as panchromatic (B/W) images. The MrSID mosaics use a 50:1 compression ratio. Approximate seamline locations containing the scan name attribute have also been provided. The aerial imagery generally encompasses the full land area of the County of Loudoun, VA. Images were flown in varying temporal and ground conditions and will exhibit some variation in tone, quality, and positional accuracy.

Single Fused Map Cache: false

Extent:

XMin: 1.163E7
YMin: 6990000.0
XMax: 1.182E7
YMax: 7170000.0
Spatial Reference: 2924  (2924)  LatestVCSWkid(0)

Initial Extent:

XMin: 1.163E7
YMin: 6990000.0
XMax: 1.182E7
YMax: 7170000.0
Spatial Reference: 2924  (2924)  LatestVCSWkid(0)

Full Extent:

XMin: 1.163E7
YMin: 6990000.0
XMax: 1.182E7
YMax: 7170000.0
Spatial Reference: 2924  (2924)  LatestVCSWkid(0)

Pixel Size X: 1.0

Pixel Size Y: 1.0

Band Count: 3

Pixel Type: U8

RasterFunction Infos: {"rasterFunctionInfos": [{ "name": "None", "description": "", "help": "" }]}

Mensuration Capabilities: None

Has Histograms: true

Has Colormap: false

Has Multi Dimensions : false

Rendering Rule:

Min Scale: 0

Max Scale: 0

Copyright Text: "Digital Orthophotography compiled by Sanborn Map Company, Inc. Colorado Springs, CO"

Service Data Type: esriImageServiceDataTypeRGB

Min Values: 0, 0, 0

Max Values: 255, 255, 255

Mean Values: 143.06906214470865, 135.36358487945034, 122.8888533993997

Standard Deviation Values: 40.774920852163255, 41.979003327606236, 43.97200606754473

Object ID Field: OBJECTID

Fields:

• OBJECTID ( type: esriFieldTypeOID, alias: OBJECTID )
• Name ( type: esriFieldTypeString, alias: Name, length: 200 )
• MinPS ( type: esriFieldTypeDouble, alias: MinPS )
• MaxPS ( type: esriFieldTypeDouble, alias: MaxPS )
• LowPS ( type: esriFieldTypeDouble, alias: LowPS )
• HighPS ( type: esriFieldTypeDouble, alias: HighPS )
• Category ( type: esriFieldTypeInteger, alias: Category , Coded Values: [0: Unknown] , [1: Primary] , [2: Overview] , ...5 more... )
• Tag ( type: esriFieldTypeString, alias: Tag, length: 100 )
• GroupName ( type: esriFieldTypeString, alias: GroupName, length: 100 )
• ProductName ( type: esriFieldTypeString, alias: ProductName, length: 100 )
• CenterX ( type: esriFieldTypeDouble, alias: CenterX )
• CenterY ( type: esriFieldTypeDouble, alias: CenterY )
• ZOrder ( type: esriFieldTypeInteger, alias: ZOrder )
• Shape ( type: esriFieldTypeGeometry, alias: Shape )
• Shape.STArea() ( type: esriFieldTypeDouble, alias: Shape.STArea() )
• Shape.STLength() ( type: esriFieldTypeDouble, alias: Shape.STLength() )

Default Mosaic Method: Northwest

Allowed Mosaic Methods: NorthWest,Center,LockRaster,ByAttribute,Nadir,Viewpoint,Seamline,None

SortField:

SortValue: null

Mosaic Operator: First

Default Compression Quality: 75

Default Resampling Method: Bilinear

Max Record Count: 1000

Max Image Height: 4100

Max Image Width: 15000

Max Download Image Count: 20

Max Mosaic Image Count: 20

Allow Raster Function: true

Allow Copy: true

Allow Analysis: true

Allow Compute TiePoints: false

Supports Statistics: true

Supports Advanced Queries: true

Use StandardizedQueries: true

Raster Type Infos:

Name: Raster Dataset
Description: Supports all ArcGIS Raster Datasets
Help:

Has Raster Attribute Table: false

Edit Fields Info: null

Ownership Based AccessControl For Rasters: null

Child Resources:   Info   Histograms   Statistics   Key Properties   Legend   Raster Function Infos

Supported Operations:   Export Image   Query   Identify   Compute Histograms   Compute Statistics Histograms   Get Samples   Compute Class Statistics   Query Boundary   Compute Pixel Location   Compute Angles   Validate   Project