2. In Data:Display, specify the data type for you wish to make a CAPPI.
Most IRIS data types are available.
If you wish to generate rain rate, select which input data type is used for the conversion.
IRIS supports Z/R and KDP/R relationships.
3. In CAPPI Height, specify the height of the CAPPI surface in kilometers and tenths of
kilometers.
The IRIS CAPPI algorithm constructs CAPPIs by interpolating in height and range to the
selected CAPPI surface.
An intermediate product in cylindrical coordinates (CAPPI height, surface range and
azimuth) is produced first, followed by the final conversion to Cartesian coordinates for
the display.
Enter a range of numbers for a 3-D CAPPI.
4. If needed, use the CAPPI Fill option.
The interpolation algorithm requires that for each point in the output product image,
there be an elevation angle both above and below the selected height.
For example, the volume scan in the sample CAPPI Product Configuration menu
cannot produce a CAPPI at 5 km (3.1 mi) height for ranges less than 5 km (3.1 mi)
because there is no angle higher than 5 km (3.1 mi) in this region.
Similarly, if you pick a low-level CAPPI surface, the lowest elevation angle is higher than
the surface at far ranges. The resulting product display shows these unsampled areas as
black.
The CAPPI Fill field uses the highest elevation angle to fill the near ranges, and the
lowest elevation angle to fill the far ranges, eliminating the black areas. This approach is
also called Pseudo CAPPI. This is not recommended for 3-D CAPPI products.
More information
‣
Display Parameters (page 27)
‣
Configuring Map Projections (page 19)
‣
Product Parameters (page 23)
‣
Associating Products with Tasks (page 17)
‣
CAPPI Height Selection Tool (page 248)
3.6
FCAST: Forecast
FCAST is an array of direction and intensity vectors used to shift a current weather display
interactively.
FCAST is used in the Quick Look Window to project other products forward in time to see a
future look at the weather. The product takes as input another image product and then
determines an average speed and direction of echo motion. It is similar to the automatic
TRACK product in that it computes the mean speed and direction by doing a cross-
correlation between the current and the previous version of the product.
Chapter 3 – Configuring IRIS Products
RESTRICTED 37
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