CAPPI stands for Constant Altitude PPI. Since CAPPI is a horizontal cut through the atmosphere, a PPI volume scan at multiple angles is required to produce it. This is achieved by scanning the atmosphere from the lowest elevation up to cloud top. The CAPPI algorithm constructs CAPPIs by interpolating in height and range to the selected CAPPI surface. The maximum range for presentation of a rainfall field is 240 km from the radar.
antenna movement
CAPPI composition
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