• The vertical line at the left represents the Product Scheduler "Next Data Time". The
scheduling algorithm only considers data ahead (to the right) of this line.
• The upper bar represents the "max time span" for making a composite. The max time
span is set in the COMP Product Configuration Menu. See Configuring COMP
(page 132).
• The lower bar interval is the "elapsed time" between the time of arrival of a product and
the current time.
• The products are positioned on the time line according to their "Data Time" (for
example, start of a volume scan).
• Each site is ranked in priority for the purpose of assigning the "Data Time" of the
composite. When the composite is made, it inherits the data time of the highest priority
used site. The ranking is determined by the order of the site list in the COMP Product
Configuration Menu.
Cases 1 and 2: Incomplete Data, Do Not Wait Forever
In these cases, the scheduler waits for the data to be completed until the time between the
arrival time of the earliest product and the current time exceeds the time window plus the
"Product arrival wait time" from Setup.
This provides tolerance for radar workstation clocks that are not exactly synchronized, or for
variations in the network transfer time.
After running, the scheduler advances the "next data time" pointer to just after the data
time of the latest product.
Note that only the radar computers must have their times synchronized. The system clock
on the compositing computer is irrelevant.
Case 3: A, B, and C Are All Available and in the Time Window
Run on A, B, and C. This is the best case since all the data have arrived.
After running, the scheduler advances the "next data time" pointer to just after the data
time of the latest product that just ran.
Case 4: Out of Sequence Data or Late Arrival
A and B both arrive and then C arrives out of the time window. Run on A and B only. After
running, advance the next data time to just after the data time of the latest product that just
ran.
A arrives then B or C arrive out of the time window. Run on A only. Advance the next data
time to just after the data time of A.
Using Skip Times
The discussion above is for a schedule where the skip time is set to 0.
In this case, no data is ever reused, and the next data time is set to just after the last product
used as inputs.
The only dierence when using a skip time is that the next data time is set to the next
multiple of the skip time after the first product that was composited. This guarantees that a
composite is not skipped because of a single missing input file. It also means that in some
cases the same input file may be used in 2 composites.
IRIS Product and Display User Guide M211319EN-H
138 RESTRICTED
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