Vaisala IRIS - Table 9 Display Parameter Formats

• When you choose a uniform color scale, you pick the number of level steps (2 ... 16).
You must also set the following fields:
• The 1st Level field sets the numerical value used to label the right side of the first
level in the color scale for the product.
• The Step field sets the spacing between the color levels. The numbers in the color
legend in the product are spaced by this value.
The color scale also associates the classification data to the class descriptors (class
identifiers with class legends). Sets of class legends can be customized as Classifier sets in
your system (with the HydroClass Name Editor in the Color Setup utility), to match the
available classifier methods.
The following table shows the units you use for the 1st Level/Step, depending on the display
parameter.
Table 9 Display Parameter Formats
Display Parameter 1st Level/Step Format
dBZ
+ - XX Whole dBZ
dBZt
+ - XX Whole dBZ
Rain +XXX.X mm/hr
Liq
+XXX.X MM
Vel
+- X.X m/s
Width
+ XX.X m/s
ZDR
+- X.X dB
TOPS
+ XX.X km
VIL
+ XX.X mm
WIND
NA
SHEAR
+- XX.X m/s/km
For the mean velocity, selecting a level step of 0 causes the velocity to be displayed for
the entire unambiguous interval between -V
u
to +V
u
.
Selecting an odd number of levels produces a legend with a band centered on 0 velocity.
Selecting an even number of velocity levels does not produce a legend with a band
centered on 0 velocity, but rather a color break exactly at 0 velocity.
When choosing a uniform color scale, you have more flexibility to choose colors. The
associations of the class identifiers with class legends is fixed by the Color Setup.
The following figure shows 2 examples of the display configuration parameters, one for ZT
and one for velocity, and the resulting color legends that would appear with the product.
Chapter 3 – Configuring IRIS Products
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