GC/AP
Ground clutter and anomalous propagation
GMAP
Gaussian model adaptive processing
IF
Intermediate Frequency.
IFDR
Intermediate Frequency Digital Receiver.
ingest file
A disk file of raw polar coordinate data that is collected during the execution of a task.
Ingest files are used for subsequent product generation. See also RAW product
(page 470).
IRIS
Interactive Radar Information System. A suite of software tools for configuring,
calibrating, and operating a complete weather radar system.
JPOLE
Joint Polarization Experiment
K
dp
Specific Dierential Phase Shift. The range derivative of the dierential phase (PhiDP)
expressed in degrees per km. It is nearly linearly proportional to the rainfall rate.
LDR
Depolarization ratio. Ratio between the reflectivity received at vertical polarization,
but transmitted with horizontal polarization, and the reflectivity at horizontal
polarization. Depolarization of the horizontal polarized pulse is caused by asymmetric
particles which are not aligned horizontal. Depolarization of rain is normally very small
(approx. -40 dB). It is high (-20 to -10 dB) for melting snow and water coated hail or
graupel.
LLWAS
Low Level Windshear Alert System.
LNA
Low noise amplifier.
LRMSK
load range mask
Melting Layer
Melting layer or ML (height). Altitude at which falling snow starts to melt. This forms
the top of the Bright Band. Also called the 0°C height.
MLHGT
Melting Level Height Detection
MSL
Mean sea level. An average level for the surface of the sea or ocean.
Glossary
469
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