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

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Figure B-12. Duplexed image showing radar image with date <strong>and</strong> time stamp (left) <strong>and</strong> thermal<br />

imaging camera display (right). Because the two images are video-duplexed, time<br />

synchronization is not a problem.<br />

St<strong>and</strong>ard Operating Procedures<br />

The vertically pointing radar component of the TI-VPR is calibrated by pointing the radar at a<br />

known, fixed target (ground clutter) <strong>and</strong> measuring the strength of the return signal while using<br />

fixed video gain <strong>and</strong> brilliance settings. The thermal imager component is calibrated according<br />

to the manufacturer’s instructions. Video settings are checked <strong>and</strong> st<strong>and</strong>ardized with respect to<br />

brightness <strong>and</strong> contrast. The radar range is set to an appropriate value (e.g., 2.8 km (1.5 nmi)<br />

with 463 m (0.25 nmi) range marks) <strong>and</strong> the parabolic antenna is pointed vertically. The thermal<br />

imaging camera is placed within 1 m of the radar antenna <strong>and</strong> directed vertically such that the<br />

beam of the radar <strong>and</strong> the field of view of the thermal imager overlap. The longitude <strong>and</strong> latitude<br />

coordinates of the TI-VPR are recorded from the GPS <strong>and</strong> the time on the date/time generator is<br />

set to the time (GMT) supplied by the GPS .<br />

Plots <strong>and</strong> track data from the eBirdRad unit are recorded continuously throughout the study<br />

period, while several hourly samples of TI-VPR data are collected during this period (Table B-1<br />

shows the sampling periods used for the <strong>IVAR</strong> studies). In the examples used here, the distance<br />

(1295 m) between the eBirdRad <strong>and</strong> the TI-VPR required that the eBirdRad antenna be elevated<br />

to 20° <strong>and</strong> 30° above horizontal in order that the radar beam would be high enough to adequately<br />

sample migrating birds in both systems (<br />

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