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<br />SCHEDULE "C" <br />Digital Imagery Specifications (Approximate) <br /> <br />Community Oblique (Nominall~ Foot) <br />Footprint: <br />Front Line: <br />Back Line: <br />Front to Back: <br />Resolution: <br />Front Line: <br />Middle Line: <br />Back Line: <br /> <br />5,000 feet (1,524 meters) <br />10,000 feet (3,048 meters) <br />7,500 feet (2,286 meters) <br /> <br />1.2 feet/pixel (0.37 meters/pixel) <br />1.6 feet/pixel (0.49 meters/pixel) <br />2.5 feet/pixel (0.76 meters/pixel) <br /> <br />Community Orthogonal (Nominall Foot) <br />Footprint: 5,280 x 2,640 feet (1,609 x 805 meters) <br />Resolution: 1 feet/pixel (0.30 meters/pixel) <br /> <br />Neighborhood Oblique (Nominal 6 Inch) <br />Footprint: <br />Front Line: <br />Back Line: <br />Front to Back: <br />Resolution: <br />Front Line: <br />Middle Line: <br />Back Line: <br /> <br />1,600 feet (488 meters) <br />2,400 feet (732 meters) <br />2,200 feet (671 meters) <br /> <br />0.4 feet/pixel (0.12 meters/pixel) <br />0.5 feet/pixel (0.15 meters/pixel) <br />0.6 feet/pixel (0.18 meters/pixel) <br /> <br />Neighborhood Orthogonal (Nominal 6 Inch) <br />Footprint: 1,650 x 1,100 feet (503 x 335 meters) <br />- Resolution: 0.5 feet/pixel (0.15 meters/pixel) <br /> <br />Image format <br /> <br />Proprietary image trailer tacked onto industry standard image format. May be <br />exported to industry standard formats. <br /> <br />Image Quality <br /> <br />Images will have an unobstructed view of the ground, however there may be <br />occasional cloud shadows. In controlled airspace, around airports, etc., and in <br />areas of r.apid elevation <:banges the image footprint sizes and resolutions may <br />vary. <br /> <br />Relative Image Accuracy <br /> <br />Approximately 5 meters or less over 1000 meters <br /> <br />Absolute Image Accuracy <br /> <br />Approximately 2-5 meters (Image location accuracies are subject to and <br />dependant upon the accuracy and posting interval of the County Digital <br />Elevation Models, especially in hilly terrain. This accuracy applies only to <br />orthogonal and not oblique images. See note below.) <br /> <br />Sensor Positional Accuracy 15 cm absolute <br />Sensor Directional Accuracy 0.01 degrees absolute <br />We utilize a Litton IMU (Inertial Measurement Unit - utilized in cruise missiles), a ground station <br />post-corrected GPS, and Kalman filtering to achieve the high degree of positional and directional <br />accuracy. <br /> <br />Ortho-rectification (Nadir Images only) Geo-referenced square pixels <br />The images will be ortho-rectified to back out the optical deviations of the capture system and then <br />resampled, utilizing USGS OEM data (30~meter postings or better if available ftom county), to <br /> <br />Page 1 of2 <br /> <br />040516 <br />