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Gaston County, NC 2009 Digital Orthos
This metadata record describes the color digital ortho imagery for Gaston County, NC. This imagery is comprised of natural color orthophotography with a GSD (Ground Sample Distance) of 0.5'. An orthoimage is 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.
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. The digital orthophoto can be used alone or as a raster basemap for corresponding vector line mapping.
Digital aerial imagery was obtained using a large format Z/I Digital Mapping Camera system (DMC) equipped with Airborne GPS/IMU covering the entire seven county project area: Burke, Catawba, Cleveland, Gaston, Iredell, Lincoln and Gaston. A total of 203 flight lines with 18023 frames were collected in the spring of 2009 in multi-spectral (RGB and NIR) 16 bits per band format. The imagery was acquired with a 4.7244" (120 m/m) focal length at an altitude above mean terrain of 4,800' to yield a raw pixel resolution of 0.48' suitable for photogrammetric mapping and orthophoto production. The imagery was collected during leaf off conditions in the spring of 2009 under conditions free from clouds and cloud shadows, smoke, fog, haze, light streaks, snow, ice on water bodies, foliage, flooding, and excessive soil moisture. The sun angle threshold was 33 degrees. The imagery consisted of panchromatic, blue, green, red and near infrared bands. The three color bands and near infrared bands have been pan sharpened and archived as frame imagery. The RGB bands were the only bands used in the orthophoto production.
Gaston County Government
Gastonia/Gaston County, NC
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Grid Coordinate System Name:
State Plane Coordinate System 1983
Horizontal Datum Name:
North American Datum of 1983
Planar Distance Units:
Geodetic Reference System 80
Gaston County GIS provides the geographic data "as is". This organization makes no guarantee or warranty concerning the accuracy of information contained in the geographic data. Also, this organization makes no warranty, either expressed or implied, regarding the condition of the product or its fitness for any particular purpose. The burden for determining fitness for use lies entirely with the user. Although these files have been processed successfully on computers at this organization, no warranty is made by this organization regarding the use of these data on any other system, nor does the fact of distribution constitute or imply such a warranty.
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