Dwell WARN Product
The example shows the results of the DWELL algorithm run on WARN products generated
by the bird warning feature. This display is recommended for use by air trac controllers
who must advise pilots of possible bird activity. In the example above, the individual bird
warnings are dwelled for 45 minutes. The display shows the selected icon (in this case a
large bird) at the position of the most recent warning in the dwell sequence. Prior warnings
are shown using a dierent icon which is also rotated to the direction of motion. The prior
warning icon name is made by appending "d" (short for dwelled) to the primary icon. In this
case we get birdd.xbm.
The result is a track style display that shows the bird activity over the dwell time. Inactive
tracks do not have the large bird icon at the end. Tracks can become inactive if the birds fly
into an obscured region or if the flock is small near the threshold of detection or if the birds
stop to roost or perhaps "funnel" in a local thermal to gain altitude. However, even inactive
tracks show controllers that there is confirmed bird activity in the area near the last sighting.
IRIS Product and Display User Guide M211319EN-H
164 RESTRICTED
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