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(IVAR) - Final Report - Strategic Environmental Research and ...

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The pattern of yellows <strong>and</strong> blues in Figure B-3 <strong>and</strong> Figure B-4 are nearly identical, indicating the<br />

digital processor is faithfully rendering the same scene as the analog processor. However, that<br />

pattern is rotated counterclockwise (west) in digital rendering shown in Figure B-4 when<br />

compared to the pattern in the analog display in Figure B-3. This is because both the analog <strong>and</strong><br />

digital displays assume the radar is pointing toward geographic north, while the radar at NAS<br />

Patuxent River was pointing approximately 10º west of north at the time these data were<br />

gathered. This deviation cannot be corrected in the BirdRad system because it has no mechanism<br />

to rotate the image. In eBirdRad, on the other h<strong>and</strong>, the image can be rotated so that returns from<br />

strong reflectors are aligned properly with their position on the underlying geo- referenced map.<br />

Making this alignment in turn rotates the display to geographic north.<br />

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