Data Dwell Product
The data DWELL product (data was selected as the primary output) is a PPI product
combining all of the PPI products from all elevation angles for the prior 10 minutes (22 PPIs
in this case). Only positive values are included since the output is the absolute value of the
velocity anomaly as compared to the background field. A contrast threshold of 1 m/s (3 ft
3 in / s) was used, that is, only data points that dier from the background field by more
than 1 m/s (3 ft 3 in / s) are included in the DWELL PPI product.
This shows streaks of velocity anomaly which are likely bird targets. Note that all of the
speckles in all of the PPI products are unfortunately passed through the DWELL algorithm.
Also note that most of the clear air echo has been eectively removed by the contrast filter.
IRIS Product and Display User Guide M211319EN-H
160 RESTRICTED
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