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

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The slight difference in alignment between the images is due to the misalignment of the BirdRad<br />

image from geographic north (see Footnote #15).<br />

Figure 6-40. eBirdRad display. Same data <strong>and</strong> display characteristics as Figure 6-39, but<br />

processed <strong>and</strong> rendered digitally.<br />

Figure 6-41 is based on the same data, with the same true trails mode as Figure 6-40, except that<br />

the ground clutter has been suppressed with clutter-map processing. The same target in the<br />

upper-left quadrant is still quite visible – perhaps more so because of the greater contrast with the<br />

background. With most of the clutter removed, small patches of blue are now visible in the area<br />

that was previously completely yellow. Most of the blue patches are probably residuals from<br />

variations in the amplitude of the signals within the clutter. However, a faint blue echo trail can<br />

be seen near the center of the picture, generally moving northwest to southeast along the runway.<br />

126

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