2. Select the product type (either CAPPI, or SRI) and the name of an input product.
When using CAPPI as input product, make sure the number of layers field (next to the
Resolution field) is 1.
The input data type can be corrected dBZ, uncorrected dBZ, or rainfall rate.
If you are integrating rainfall rate inputs, the Minimum dBZ field is not applicable.
The priority of the RAIN1 product must be lower than that of the CAPPI and SRI
products to ensure that all of the inputs are ready before the RAIN1 product is made.
Use the setup utility's product command to set the relative priorities of products.
3. To enable clutter maps, select Clutter Map.
To use this, you must make a RAIN1 product with a matching name and resolution in
clear weather.
This file is then subtracted from each hourly accumulation. The clutter map file is
marked in the Product Output Menu.
4. In Minimum dBZ, set the minimum value of dBZ used to compute rainfall amounts.
dBZ values that are less than this are treated as 0 rainfall.
This prevents very weak echoes from being counted as rainfall.
In most cases, set this to -10 dBZ, although you should choose a value appropriate to
your site.
Set the value to -33 to disable Minimum dBZ.
5. In Minutes, set the desired time period for rainfall accumulation.
Generally 60 minutes is used to produce a one hour rainfall product, but you can use
shorter intervals. The minimum accumulation time is 15 minutes.
6. If you have purchased the IRIS/Hydromet software license, select Gage Cal to have the
product use the raingage correction algorithm.
More information
‣
Display Parameters (page 27)
‣
Configuring Map Projections (page 19)
‣
Product Parameters (page 23)
‣
Associating Products with Tasks (page 17)
‣
Hydromet Raingage Correction Overview (page 363)
‣
CATCH: Subcatchments Precipitation Accumulation (page 121)
3.12.1
Scheduling RAIN1 Products
The Data Time that you specify when you schedule the product are quantized to the time
value in the product configuration for the nearest interval that ends the integration.
For example, if you want to schedule a 60 minute RAIN1 product to integrate the
precipitation in the hour from 11:00 to 12:00, set the time to 12:00. If the associated task is
running at the end of an hour, the Product Scheduler waits for it to complete, so the task
data can be included in the hour's integration.
Use the Skip Time field if you want only the accumulations for specific time intervals. You
can set the skip time to any multiple of the accumulation period. For example, if you want a
3-hour integration only for the periods ending at 03:00, 06:00, 09:00, ..., set the Skip Time
field to 03:00.
Chapter 3 – Configuring IRIS Products
RESTRICTED 57
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