lrose-core
Core C/C++ code for LROSE.
This project is maintained by NCAR
Dual-Polarization Processing in LROSE
In this document we illustrate some of the basic operations that the Radx apps in LROSE can perform for dual-polarization processing.
In these examples we are using some data from the NCAR S-Pol radar at the site near Hays, Kansas during the PECAN field project in 2015.
The measured fields
- DBZ
- ZDR
- RHOHV
- PHIDP
- TEMP <!—
- VEL
- WIDTH —>
DBZ
PPI
RHI
ZDR
RHI
RHOHV
RHI
PHIDP
RHI
TEMPERATURE
RHI
The derived fields
- KDP
- PID (Particle ID, Hydrometeor type)
- PRECIP RATE
KDP
We compute KDP from PHIDP.
It is defined as the slope of PHIDP in range, divied by 2.
KDP can be noisy - considerable smoothing and other filtering is required for good results.
RHI
We compute PDI from the above dual-pol fields, in addition to temperature
PID
PID is computed using a fuzzy-logic approach.
RHI
Precip rate
Precip rate may be computed using DBZH, Z/ZDR and KDP.
RATE_ZH
PPI
RATE_Z_ZDR
PPI
RATE_KDP
PPI
RATE_HYBRID
A hybrid rate may be estimated using a combination of the computed rates.
PPI
