S-Pol PECAN, Field Data Set Parameters

A number of slightly different data sets were logged at the S-Pol system during PECAN.  Data sets were created for Base Data (in both a moments and a covariance form), Particle ID/RainRate, and a QPE data set for use in creating a rain amount product with other radars.  There were over 50 named parameters logged between all of these data sets.  A list and description is presented.  A final, merged, data set will contain many of these same variables (with any corrections applied), and may also include additional variables.

Note that for the in-field data set, many of these parameters are collected for diagnostic purposes, and may not appear in the final data set.  Also note that the convention of using an "_F" indicates that the S-Pol clutter filter and CMD has been applied to the data, but that the final data set may contain only the clutter-filtered parameters, and that the "_F" may be deleted from those parameter names.

The CfRadial Format Moments Data Set

Parameter
Units
Standard Name
Long Name
Comments:
DBZ
dBZ
equivalent_reflectivity_factor
reflectivity
Field-calibrated, not clutter filtered; elevation angle-dependent atmospheric attenuation applied, as in Doviak and Zrnic, 1993 (pp.44-45)
DBZ_F
dBZ
equivalent_reflectivity_factor
reflectivity
Field-calibrated, clutter filtered; elevation angle-dependent atmospheric attenuation applied, as in Doviak and Zrnic, 1993 (pp.44-45)
VEL
m/s
radial_velocity_of_scatterers_away_from_instrument
doppler_velocity
Traditional fast-alternating dual-pol velocity estimate, from H and V interspersed signal, with phase offset (Wilson/Illingworth/Blackman, 1997). This velocity is noisy if PHIDP is noisy. Nyquist velocity is ~26.7 m/s.  Not Clutter-filtered.
VEL_F
m/s
radial_velocity_of_scatterers_away_from_instrument
doppler_velocity_filtered
Traditional fast-alternating dual-pol velocity estimate, from H and V interspersed signal, with phase offset (Wilson/Illingworth/Blackman, 1997). This velocity is noisy if PHIDP is noisy. Nyquist velocity is ~26.7 m/s.  Clutter-fltered.
VEL_HV
m/s
radial_velocity_of_scatterers_away_from_instrument
doppler_velocity_hv_channels_separately
Velocity from H-only pulses, averaged with velocity from V-only pulses; reprocessed from phase information in covariance data set. This velocity is useful in regions where PHIDP is noisy, as when there is significant phase-shift on backscatter (e.g., gust fronts and bird echoes). Nyquist velocity is ~13.3 m/s. Not clutter-filtered.
VEL_HV_F
m/s
radial_velocity_of_scatterers_away_from_instrument
doppler_velocity_hv_channels_separately_filtered
(same as previous, but with clutter filter applied)
VEL_ALT
m/s
radial_velocity_of_scatterers_away_from_instrument
doppler_velocity_alternating_mode
Derived from VEL_HV, unfolded to wider Nyquist interval using VEL. This is the recommended velocity field for general use, except in cases where there is significant noise in PHIDP. This velocity is generally less noisy than the VEL_S, but may sometimes be unfolded into the wrong velocity interval. The working Nyquist interval is ~26.7 m/s.
VEL_ALT_F
m/s
radial_velocity_of_scatterers_away_from_instrument
doppler_velocity_alternating_mode_filtered
(same as previous, but with clutter filter applied)
WIDTH
m/s
doppler_spectrum_width
spectrum_width
Doppler spectrum velocity width
WIDTH_F
m/s
doppler_spectrum_width
spectrum_width_filtered
(same as previous, but with clutter filter applied)
CLUT
dB
clutter_power
clutter_power
Clutter power removed.  See Steiner and Smith, 2002; Hubbert, et al., 2009a, and Hubbert, et al., 2009b.
ZDR
dB
log_differential_reflectivity_hv
differential_reflectivity
ZDR defined by Seliga and Bringi, 1976. Derived from calibrated copolar reflectivities; zdr bias from vertical pointing data applied (same bias as used for the in-field data set). See bias determination report.
ZDR_F
dB
log_differential_reflectivity_hv
differential_reflectivity_filtered
(same as previous, but with clutter filter applied)
ZDRM
dB
log_differential_reflectivity_hv
differential_reflectivity_uncalibrated
ZDR defined by Seliga and Bringi, 1976. Derived from calibrated copolar reflectivities; zdr bias not applied.  (ZDR "measured")
ZDRM_F
dB
log_differential_reflectivity_hv
differential_reflectivity_uncalibrated_filtered
(same as previous, but with clutter filter applied)
ZDR_BIAS
dB
log_differential_reflectivity_bias
differential_reflectivity_bias
in-field estimated ZDR bias (used for diagnostic purposes, only)
ZDR_BIAS_F
dB
log_differential_reflectivity_bias
differential_reflectivity_bias_filtered
(same as previous, but with clutter filter applied)
LDRH
dB
log_linear_depolarization_ratio_h
linear_depolarization_ratio_hc_to_vx
Calibrated and noise-corrected. Transmit H-polarization, receive V.
LDRH_F
dB
log_linear_depolarization_ratio_h
linear_depolarization_ratio_ratio_hv_to_vx_filtered
(same as previous, but with clutter filter applied)
LDRV
dB
log_linear_depolarization_ratio_v
linear_depolarization_ratio_vc_to_hx
Calibrated and noise-corrected. Transmit V-polarization, receive H.
LDRV_F
dB
log_linear_depolarization_ratio_v
linear_depolarization_ratio_vc_to_hx_filtered
(same as previous, but with clutter filter applied)
LDR_DIFF_F
dB
log_linear_depolarization_ratio_v
ldrv_minus_ldrh
Difference of depolarization ratios, LDRV_F minus LDRH_F
LDR_MEAN_F
dB
log_linear_depolarization_ratio_h
mean_of_ldrv_and_ldrh
Mean of LDRH_F and LDRV_F
RHOHV
none
cross_correlation_ratio_hv
cross_correlation_ratio
in-field noise-corrected RHOHV. Provides a more consistent value in regions of low SNR. Derived from original (in-field) covariance data set. (see Zrnic, 1988 for formulation).
RHOHV_F
none
cross_correlation_ratio_hv
cross_correlation_ratio_filtered
(same as previous, but with clutter filter applied)
RHOHV_NNC
none
cross_correlation_ratio_hv
cross_correlation_ratio_no_noise_correction
in-field RHOHV, not noise corrected.
RHOHV_NNC_F
none
cross_correlation_ratio_hv
cross_correlation_ratio_no_noise_correction_filtered
(same as previous, but with clutter filter applied)
RHO_HC_VX
none
cross_correlation_ratio_hcvx
cross_correlation_ratio_hc_to_vx
Ratio of correlation coefficients, HC to VX (horizontal co-polar to Vertical cross-polar)
RHO_VC_HX
none
cross_correlation_ratio_hchx
cross_correlation_ratio_vc_to_hx
Ratio of correlation coefficients, VC to HX
RHO_VX_HX
none
cross_correlation_ratio_hchx
cross_correlation_ratio_vx_to_hx
Ratio of correlation coefficients, VX to HX
PHIDP0
deg
system_differential_phase_hv
system_differential_phase
 
PHIDP0_F
deg
system_differential_phase_hv
system_differential_phase_filtered
(same as previous, but with clutter filter applied)
PHIDP
deg
differential_phase_hv
differential_phase
See Jameson and Mueller, 1985; processed according to Hubbert and Bringi, 1995.
PHIDP_F
deg
differential_phase_hv
differential_phase_filtered
(same as previous, but with clutter filter applied)
KDP
deg/km
specific_differential_phase_hv
specific_differential_phase
Processed according to Hubbert and Bringi, 1995.
KDP_F
deg/km
specific_differential_phase_hv
specific_differential_phase_filtered
(same as previous, but with clutter filter applied)
SNRHC
dB
signal_to_noise_ratio_co_polar_h
signal_to_noise_ratio_co_polar_h
 
SNRHC_F
dB
signal_to_noise_ratio_co_polar_h
signal_to_noise_ratio_co_polar_h_filtered
(same as previous, but with clutter filter applied)
SNRHX
dB
signal_to_noise_ratio_cross_polar_h
signal_to_noise_ratio_cross_polar_h
 
SNRHX_F
dB
signal_to_noise_ratio_cross_polar_h
signal_to_noise_ratio_cross_polar_h_filtered
(same as previous, but with clutter filter applied)
SNRVC
dB
signal_to_noise_ratio_co_polar_v
signal_to_noise_ratio_co_polar_v
 
SNRVC_F
dB
signal_to_noise_ratio_co_polar_v
signal_to_noise_ratio_co_polar_v_filtered
(same as previous, but with clutter filter applied)
SNRVX
dB
signal_to_noise_ratio_cross_polar_v
signal_to_noise_ratio_cross_polar_v
 
SNRVX_F
dB
signal_to_noise_ratio_cross_polar_v
signal_to_noise_ratio_cross_polar_v_filtered
(same as previous, but with clutter filter applied)
DBMHC
dBm
log_power_co_polar_h
log_power_co_polar_h
 
DBMHC_F
dBm
log_power_co_polar_h
log_power_co_polar_h_filtered
(same as previous, but with clutter filter applied)
DBMHX
dBm
log_power_cross_polar_h
log_power_cross_polar_h
 
DBMHX_F
dBm
log_power_cross_polar_h
log_power_cross_polar_h_filtered
(same as previous, but with clutter filter applied)
DBMVC
dBm
log_power_co_polar_v
log_power_co_polar_v
 
DBMVC_F
dBm
log_power_co_polar_v
log_power_co_polar_v_filtered
(same as previous, but with clutter filter applied)
DBMVX
dBm
log_power_cross_polar_v
log_power_cross_polar_v
 
DBMVX_F
dBm
log_power_cross_polar_v
log_power_cross_polar_v_filtered
(same as previous, but with clutter filter applied)
NOISE_BIAS
dB
bias_in_noise_floor
bias_in_noise_floor_from_thermal_effect
 
NCP normalized_coherent_power
normalized_coherent_power
 
NCP_F normalized_coherent_power
normalized_coherent_power_filtered
(same as previous, but with clutter filter applied)
CPA
none
clutter_phase_alignment
clutter_phase_alignment
See Steiner and Smith, 2002; Hubbert, et al., 2009a, and Hubbert, et al., 2009b.
TDBZ
none
texture_of_reflectivity
texture_of_reflectivity
See Steiner and Smith, 2002; Hubbert, et al., 2009a, and Hubbert, et al., 2009b.
SPIN
none
spin_of_reflectivity
spin_of_reflectivity
See Steiner and Smith, 2002; Hubbert, et al., 2009a, and Hubbert, et al., 2009b.
ZDR_SDEV
none
standard_deviation_of_zdr
standard_deviation_of_zdr
 
PHIDP_SDEV
none
standard_deviation_of_phidp
standard_deviation_of_phidp
 
CMD
none
clutter_mitigation_decision
clutter_mitigation_interest
See Steiner and Smith, 2002; Hubbert, et al., 2009a, and Hubbert, et al., 2009b.
CMD_FLAG
none
clutter_mitigation_decision_flag
clutter_mitigation_interest_flag
See Steiner and Smith, 2002; Hubbert, et al., 2009a, and Hubbert, et al., 2009b.
AIQ
deg
AIQ
AIQ
Average phase of backscattered power (HH).  AIQ is used in the Fabry refractive index work for the determination of virtual temperature.  Fabry, 2004; Fabry et al., 1997; Weckwerth et al., 2005.
NIQ
dBm
NIQ
NIQ
Average magnitude of backscatter pwr (HH).  Fabry, 2004; Fabry et al., 1997; Weckwerth et al., 2005.

 

The ParticleID/Rain Data Set

KDP_FOR_RATE
deg/km
specific_differeential_phase_hv
specific_differential_phase
 
DBZ_FOR_RATE
dBZ
equivalent_reflectivity_factor
radar_reflectivity
 
ZDR_FOR_RATE
dB
log_differential_reflectivity
calibrated_log_differential_reflectivity
 
KDP
deg/km
specific_differential_phase_hv
specific_differential_phase
 
PID hydrometeor_type
particle_id
See Vivekanandan, et al., 1999 for details. Modifications made by Scott Ellis to tune fuzzy logic for PECAN. The in-field version of PID may differ somewhat from the final PID.
TEMP_FOR_PID
C
temperature
temperature_for_computing_pid
 
SDZDR_FOR_PID
dB
sdev_of_zdr
sdev_of_zdr_for_computing_pid
 
SDPHIDP_FOR_PID
deg
sdev_of_phidp
sdev_of_phidp_for_computing_pid
 
RATE_ZH
mm/hr
precip_rate_from_z
precip_rate_from_z
 
RATE_ZH_SNOW
mm/hr
precip_rate_from_z_in_snow
precip_rate_from_z_in_snow
 
RATE_Z_ZDR
mm/hr
precip_rate_from_z_and_zdr
precip_rate_from_z_and_zdr
 
RATE_KDP
mm/hr
precip_rate_from_kdp
precip_rate_from_kdp
 
RATE_KDP_ZDR
mm/hr
precip_rate_from_z_and_zdr
precip_rate_from_z_and_zdr
 
RATE_KDP
mm/hr
precip_rate_from_kdp
precip_rate_from_kdp
 
RATE_KDP_ZDR
mm/hr
precip_rate_from_kdp_and_zdr
precip_rate_from_kdp_and_zdr
 
RATE_HYBRID
mm/hr
precip_rate_hybrid_of_zh_zzdr_kdp_and_kdpzdr
precip_rate_hybrid_of_zh_zzdr_kdp_and_kdpzdr
 
RATE_PID
mm/hr
precip_rate_based_on_pid
precip_rate_from_pid_weights
 
RATE_BRINGI
mm/hr
precip_rate_bringi_of_zh_zzdr_kdp_and_kdpzdr
precip_rate_bringi_of_zh_zzdr_kdp_and_kdpzdr
 
RATE_HIDRO
mm/hr
precip_rate_hidro_of_zh_zzdr_kdp_and_kdpzdr
precip_rate_hidro_of_zh_zzdr_kdp_and_kdpzdr
 
DBZ
dBZ
equivalent_reflectivity_factor
reflectivity
 
VEL
m/s
radial_velocity_of_scatterers_away_from_instrument
doppler_velocity_filtered
 
WIDTH
m/s
doppler_spectrum_width
spectrum_width_filtered
 
ZDR
dB
log_differential_reflectivity_hv
differential_reflectivity_filtered
 
PHIDP
deg
differential_phase_hv
differential_phase_filtered
 

 

The Quantitative Precipitation Estimate (QPE) Data Set

PID
none
PID
PID
See Vivekanandan, et al., 1999 for details. Modifications made by Scott Ellis to tune fuzzy logic for PECAN. The in-field version of PID may differ somewhat from the final PID.
HEIGHT
km
HEIGHT_MSL
HEIGHT_MSL
 
RANGE
km
range_from_radar
range_from_radar
 
NBLOCK
count
NBLOCK
NBLOCK
 
NLOW_SNR
count
NLOW_SNR
NLOW_SNR
 
NCLUT
count
NCLUT
NCLUT
 
RATE_ZH
mm/h
RATE_ZH
RATE_ZH
 
RATE_Z_ZDR
mm/h
RATE_Z_ZDR
RATE_Z_ZDR
 
RATE_KDP
mm/h
RATE_KDP
RATE_KDP
 
RATE_PID
mm/h
RATE_PID
RATE_PID
 

 

The Covariance Data Set

SNRHC
dB
SNRHC
SNRHC
 
CPA CPA
clutter_phase_alignment
See Steiner and Smith, 2002; Hubbert, et al., 2009a, and Hubbert, et al., 2009b.
CMD_FLAG CMD_FLAG
clutter_mitigation_decision_flag
See Steiner and Smith, 2002; Hubbert, et al., 2009a, and Hubbert, et al., 2009b.
AIQ
deg
AIQ
mean_phase_from_phasor_sum
Average phase of backscattered power (HH).  AIQ is used in the Fabry refractive index work for the determination of virtual temperature.  Fabry, 2004; Fabry et al., 1997; Weckwerth et al., 2005.
NIQ
dBm
NIQ
log_mean_power_from_phasor_sum
Average magnitude of backscatter pwr (HH).  Fabry, 2004; Fabry et al., 1997; Weckwerth et al., 2005.
LAG0_HC_DB
dBm
LAG0_HC_DB
log_lag0_power_hc_hc
 
LAG0_HC_DB_F
dBm
LAG0_HC_DB_F
filtered_log_lag0_power_hc_hc
(same as previous, but with clutter filter applied)
LAG0_HX_DB
dBm
LAG0_HX_DB
log_lag0_power_hx_hx
 
LAG0_HX_DB_F
dBm
LAG0_HX_DB_F
filtered_log_lag0_power_hx_hx
(same as previous, but with clutter filter applied)
LAG0_VC_DB
dBm
LAG0_VC_DB
log_lag0_power_vc_vc
 
LAG0_VC_DB_F
dBm
LAG0_VC_DB_F
filtered_log_lag0_power_vc_vc
(same as previous, but with clutter filter applied)
LAG0_VX_DB
dBm
LAG0_VX_DB
log_lag0_power_vx_vx
 
LAG0_VX_DB_F
dBm
LAG0_VX_DB_F
filtered_log_lag0_power_vx_vx
(same as previous, but with clutter filter applied)
LAG0_HCVX_DB
dBm
LAG0_HCVX_DB
log_lag0_power_hc_vx
 
LAG0_HCVX_DB_F
dBm
LAG0_HCVX_DB_F
filtered_log_lag0_power_hc_vx
(same as previous, but with clutter filter applied)
LAG0_HCVX_PHASE
deg
LAG0_HCVX_PHASE
log_lag0_phase_hc_vx
 
LAG0_HCVX_PHASE_F
deg
LAG0_HCVX_PHASE_F
filtered_log_lag0_phase_hc_vx
(same as previous, but with clutter filter applied)
LAG0_VCHX_DB
dBm
LAG0_VCHX_DB
log_lag0_power_vc_hx
 
LAG0_VCHX_DB_F
dBm
LAG0_VCHX_DB_F
filtered_log_lag0_power_vc_hx
(same as previous, but with clutter filter applied)
LAG0_VCHX_PHASE
deg
LAG0_VCHX_PHASE
log_lag0_phase_vc_hx
 
LAG0_VCHX_PHASE_F
deg
LAG0_VCHX_PHASE_F
filtered_log_lag0_phase_vc_hx
(same as previous, but with clutter filter applied)
LAG1_HCVC_DB
dBm
LAG1_HCVC_DB
log_lag1_power_hc_vc
 
LAG1_HCVC_DB_F
dBm
LAG1_HCVC_DB_F
filtered_log_lag1_power_hc_vc
(same as previous, but with clutter filter applied)
LAG1_HCVC_PHASE
deg
LAG1_HCVC_PHASE
lag1_phase_hc_vc
 
LAG1_HCVC_PHASE_F
deg
LAG1_HCVC_PHASE_F
filtered_lag1_phase_hc_vc
(same as previous, but with clutter filter applied)
LAG1_VCHC_DB
dBm
LAG1_VCHC_DB
log_lag1_power_vc_hc
 
LAG1_VCHC_DB_F
dBm
LAG1_VCHC_DB_F
filtered_log_lag1_power_vc_hc
(same as previous, but with clutter filter applied)
LAG1_VCHC_PHASE
deg
LAG1_VCHC_PHASE
lag1_phase_vc_hc
 
LAG1_VCHC_PHASE_F
deg
LAG1_VCHC_PHASE_F
filtered_lag1_phase_vc_hc
(same as previous, but with clutter filter applied)
LAG2_HC_DB
dBm
LAG2_HC_DB
log_lag2_power_hc_hc
 
LAG2_HC_DB_F
dBm
LAG2_HC_DB_F
filtered_log_lag2_power_hc_hc
(same as previous, but with clutter filter applied)
LAG2_HC_PHASE
deg
LAG2_HC_PHASE
lag2_phase_hc
 
LAG2_HC_PHASE_F
deg
LAG2_HC_PHASE_F
filtered_lag2_phase_hc
(same as previous, but with clutter filter applied)
LAG2_VC_DB
dBm
LAG2_VC_DB
log_lag2_power_vc_vc
 
LAG2_VC_DB_F
dBm
LAG2_VC_DB_F
filtered_log_lag2_power_vc_vc
(same as previous, but with clutter filter applied)
LAG2_VC_PHASE
deg
LAG2_VC_PHASE
lag2_phase_vc
 
LAG2_VC_PHASE_F
deg
LAG2_VC_PHASE_F
filtered_lag2_phase_vc
(same as previous, but with clutter filter applied)
LAG3_VC_PHASE_F
deg
LAG3_VC_PHASE_F
filtered_lag3_phase_vc_hc
 

 

References

  • Dixon, M., J.C. Hubbert, 2012: The Separation of Noise and Signal Components in Doppler RADAR Returns. ERAD 2012, The Seventh European Conference on RADAR in Meteorology and Hydrology. Toulouse, France. SP-078.
  • Doviak, R.J., D.S. Zrnic, 1993. Doppler Radar and Weather Observations. Academic Press, 2nd ed. ISBN-13: 978-0122214226 
  • Hubbert, J. C., M. Dixon, S. M. Ellis, G. Meymaris, 2009: Weather Radar Ground Clutter. Part I: Identification, Modeling, and Simulation. J. Atmos. Oceanic Technol., 26, 1165-1180. doi: http://dx.doi.org/10.1175/2009JTECHA1159.1
  • Hubbert, J. C., M. Dixon, S. M. Ellis, 2009: Weather Radar Ground Clutter. Part II: Real-Time Identification and Filtering. J. Atmos. Oceanic Technol., 26, 1181-1197. doi: http://dx.doi.org/10.1175/2009JTECHA1160.1
  • Weckwerth, Tammy M., Crystalyne R. Pettet, Frédéric Fabry, Shin Ju Park, Margaret A. LeMone, and James W. Wilson, 2005: Radar Refractivity Retrieval: Validation and Application to Short-Term Forecasting. J. Appl. Meteor., 44, 285–300. doi: http://dx.doi.org/10.1175/JAM-2204.1
  • Wilson, Damian R., Anthony J. Illingworth, T. Mark Blackman, 1997: Differential Doppler Velocity: A Radar Parameter for Characterizing Hydrometeor Size Distributions. J. Appl. Meteor., 36, 649-663. doi: http://dx.doi.org/10.1175/1520-0450-36.6.649
  • Zrnic, D.S.; Balakrishnan, N.; Sachidananda, M., 1988: Processing And Interpretation Of Alternately Polarised Weather Radar Echoes. Geoscience and Remote Sensing Symposium, 1988. IGARSS '88. Remote Sensing: Moving Toward the 21st Century., International Volume: 1 Page(s): 243-246. doi: 10.1109/IGARSS.1988.570103