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Onslow County, NC 2006 Digital Orthos

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Abstract: An orthoimage is a remotely sensed image data in which displacement of features in the image caused by terrain relief and sensor orientation have been mathematically removed. Orthoimagery combines the image characteristics of a photograph with the geometric qualities of a map. For this dataset, the orthoimages were produced at a 0.5 foot pixel resolution, and was flown on March 4 and March 5, 2006.
Purpose: This data was developed to provide a spatially accurate, high resolution imagery to be used in the creation of other data layers. This Aerial Photography layer is also a primary base layer.
Supplemental Information: Aerial photography was acquired utilizing a Wild RC30 aerial camera system with a six-inch focal length. This camera is equipped with a high resolution, distortion free lens and forward motion compensation. The photography was flown at an average of 7,000 feet above mean terrain (AMT). The photography was flown with a 60 percent forward overlap and a 30 percent sidelap. During the time of image acquisition two dual frequency GPS receivers were utilized. One receiver was operated on board the aircraft with the dual frequency antenna located directly over the camera. The shutter output from the aerial camera was directly connected to the receiver. The second receiver was used as a base station. These receivers were in constant operation during the photography mission and GPS phase data was collected at an epoch rate of 1 second. The airborne GPS data and IMU were used in combination with ground surveyed points to control the photography. The photography was scanned at a resolution of 7 microns and the imagery was orthorectified using the existing North Carolina Floodplain Mapping LiDAR Digital Surface Models (DSMs) that were subsequently edited down to bare earth returns only and Digital Elevation Models (DEMs) were generated.
Publication Date: 20060928
Originator: Onslow County Government
Publisher: Sanborn, LLC
Time Period of Content:
Time Period Information:
Range of Dates/Times:
Beginning Date: 20060304
Ending Date: 20060305
Currentness Reference: Ground Condition
Progress: Complete
Maintenance and Update Frequency: Unknown
Spatial Domain:
Bounding Coordinates:
West Bounding Coordinate: -85.669640
East Bounding Coordinate: -77.063134
North Bounding Coordinate: 35.013934
South Bounding Coordinate: 33.568155
Contact Organization: Onslow County GIS Department
Contact Electronic Mail Address:
Contact Voice Telephone: 910-989-2210
Contact Organization: Onslow County GIS Department
Grid Coordinate System Name: State Plane Coordinate System 1983
Horizontal Datum Name: North American Datum of 1983
Planar Distance Units: US Survey Feet
Ellipsoid Name: Geodetic Reference System 80
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 Label: Value
Attribute Definition: Number from 0 to 255 within each color band indicating shade of pixel
Attribute Definition Source: Onslow County GIS Department
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 0
Range Domain Maximum: 255
Attribute Label: Count
Attribute Definition: Number of pixels with that value
Attribute Definition Source: Onslow County GIS Department
Attribute Domain Values:
Unrepresentable Domain: The count of pixels for a certain value is unique.
Distribution Liability: Although care has been taken in preparing the information contained in this data, Onslow County does not guarantee the accuracy thereof. Anyone using the data does so at their own risk and shall be deemed to indemnify Onslow County from any and all injury and/or damage arising from such use. This data may not be resold.
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