Parent Layer: Imagery

Display Field: Name

Type: Raster Catalog Layer

Geometry Type: esriGeometryPolygon

Description: A digital ortho-photograph is a digital image of an aerial photograph with image distortion removed, and corrected for aircraft pitch, yaw and altitude, landscape relief, and camera lens (optic correction) orientation. These DOQs are developed from 1999 NAPP flight coverage flown under the National Aerial Photography Program. The aerial photographs are exposed using 10-inch wide film at 20,000 feet above land surface, with 6 inch focal length camera, resulting in 1:40,000 scale image. The digital (scanned) image is rectified to orthographic projections by processing each image pixel through photogrammetric equations derived from photo-identifiable GPS ground control points, camera calibration from orientation parameters, and the digital elevation model data base. The finished product is a spatially accurate image with identifiable features represented in their true planimetric positions. This digital image is a GIS product which can be overlaid and manipulated like any other coverage or layer, and offers significant flexibility. The National Mapping Standards for primary digital orthophotoquad (DOQ) require a 1-meter ground resolution for quarter-quadrangle (3.75-minutes of latitude by 3.75-minutes of longitude) image cast on the Universal Transverse Mercator Projection (UTM) on the North American Datum of 1983 (NAD83) and mapped to 1:12,000 scale. The geographic extext of the DOQ is equivalent to a quarter-quad plus the overedge of 100 meters beyond the extremes of the primary and secondary corner points. The overedge is included to facilitate tonal matching for mosaicking and for the placement of the NAD83 and secondary datum corner ticks. The normal orientation of data is by lines (rows) and samples (columns). Each line contains a series of pixels ordered from west to east with the order of the lines from north to south. The standard, archived digital orthophoto is formatted as four ASCII header records, followed by a series of 8-bit binary image data records. The radiometric image brightness values are stored as 256 gray levels ranging from 0 to 255. The metadata provided in the digital orthophoto contain a wide range of descriptive information including format source information, production instrumentation and dates, and data to assist with displaying and georeferencing the image. The standard distribution format of COQs will be JPEG compressed images. The reconstituted image will exhibit some radiometric differences when compared to its uncompressed original but will retain the geometry of the uncompressed DOQ. The DOQs and COQs are distributed on tape or on CD-ROMs.

Definition Expression:

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Spatial Reference: 26852

Has Attachments: False

HTML Popup Type: esriServerHTMLPopupTypeAsHTMLText

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Simple Renderer:
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Fields:

• OBJECTID (Type: esriFieldTypeOID, Alias: OBJECTID)
• Name (Type: esriFieldTypeString, Alias: Name, Length: 256 )
• Shape (Type: esriFieldTypeGeometry, Alias: Shape)
• Raster (Type: esriFieldTypeRaster, Alias: Raster)
• Shape.area (Type: esriFieldTypeDouble, Alias: Shape.area)
• Shape.len (Type: esriFieldTypeDouble, Alias: Shape.len)

Type ID Field: N/A

Supported Interfaces:   REST

Supported Operations:   Query