Vaisala IRIS - Figure 87 Forecast Example with a Typhoon

Figure 87 Forecast Example with a Typhoon
The image can be shifted in the following ways:
• User Input
The forecaster inputs a speed and direction as was done in the example.
The echo is shifted by a constant speed and direction. This is shown in the example
above.
• FCAST product (IRIS or user Forecast product)
Forecast products can be produced either by IRIS or by external programs that create
forecast products and insert them into IRIS.
The echoes can be subjected to both a non-uniform motion field and a non-uniform
intensity change field.
The IRIS FCAST product computes a uniform wind field based on the average echo
motion as calculated from a 2D cross-correlation of the current and previous image. No
intensity change is calculated. Check with your system manager to see what FCAST
products are available on your system.
IRIS Product and Display User Guide M211319EN-H
242 RESTRICTED