• Input from External Raingage Network
Raingage data are supplied by the customer in the form of files that are transferred
automatically by the customer over the network to a directory that is defined by the
IRIS Setup > Input.
Each file should contain the total accumulation for the previous hour for all gages. See
Gage Data File Format (page 366).
• Input Pipe for Format Conversion to GAGE product
The Input Pipe is a format convertor to reformat the customer data to the GAGE
product format. The Input Pipe is specified in Setup > Input.
It is a software program that is usually customized for the particular raingage network.
You can create their own pipes or Vaisala can provide the pipe AsciiToGage, in which
case the pipe source code is also provided so that customers can maintain the pipes in
the future.
• GAGE Product
This is a product in IRIS that contains the raingage totals for all gages in the network for
the last hour. See Gage Data File Format (page 366).
• Input CAPPI products
The IRIS RAIN1 hourly rainfall accumulation product uses CAPPI products as input. The
CAPPI products can be in dBZ, dBT, or the corresponding rainfall rate according to a
default Z–R relationship such as Z=200R
1.6
.
Usually a "Filled" pseudo CAPPI is used so that at far ranges the lowest elevation angle
is used to fill in the data.
• RAIN1 Processing and Raingage Calibration Process
Gage correction is activated when the gage correction button is turned on in the RAIN1
product configuration menu. In this case, the IRIS product generator waits for all of the
CAPPIs and the GAGE product for the previous hour and then runs the RAIN1
algorithm.
For information on the scheduling considerations for the RAIN1 algorithm with GAGE
correction, that is, how to handle the time delay of the arrival of the GAGE products,
see RAIN1 Scheduling with GAGE Product (page 372).
The RAIN1 algorithm proceeds normally as described in RAIN1 : Hourly Rain
Accumulation (page 56).
The extra step of the GAGE correction is done by a "Product Pipe" algorithm. Vaisala
supplies an algorithm based on Brandes and Wilson (1982). You can supply your own
product pipe correction algorithm in lieu of the one supplied. See IRIS Programming
Guide.
• Corrected RAIN1 Product
The raingage calibration process outputs the final corrected RAIN1 product for use by
the RAINN and the CATCH products.
You can make an uncorrected RAIN1 product can be made by running the RAIN1
product (under a dierent name) with the gage correction button disabled. For
example, name the uncorrected product HOURLY and the corrected product
HOURLY- GAGE.
Appendix E – Hydromet Raingage Correction
RESTRICTED 365
To Next Page
Loading...