DQR ID | Subject | Data Streams Affected |
---|
D051202.5 | TWP/SKYRAD/C1 - Reprocess: Incorrect datalogger program affecting PIR1 and PIR2 downwelling longwave | twpskyrad20sC1.a0, twpskyrad60sC1.b1 |
D051202.6 | TWP/SKYRAD/C2 - Reprocess: Incorrect datalogger program affecting PIR1 and PIR2 downwelling longwave | twpskyrad20sC2.a0, twpskyrad60sC2.b1 |
D070206.1 | TWP/SKYRAD/C2 - Short direct normal | twpskyrad20sC2.a0, twpskyrad60sC2.b1 |
D071204.2 | TWP/SKYRAD/C2 - Reprocessed: Incorrect calibrations | twpskyrad20sC2.a0, twpskyrad60sC2.b1 |
D080211.2 | TWP/SKYRAD/C1 - Failed PSP ventilator fan | twpskyrad20sC1.a0, twpskyrad60sC1.b1 |
D080313.2 | TWP/SKYRAD/C2 - Direct Normal reading too low | twpskyradC2.00, twpskyrad20sC2.a0, twpskyrad60sC2.b1 |
D080618.1 | TWP/SKYRAD/C1 - Tracker Failure | twpskyrad20sC1.a0, twpskyrad60sC1.b1 |
D080718.1 | TWP/MPL/C1 - Laser not transmitting | twpmplpolC1.b1, twpmplpolavgC1.c1, twpmplpolavgC1.s1 |
D080826.3 | TWP/SKYRAD/C1 - PIR2 ventilator fan failure | twpskyrad20sC1.a0, twpskyrad60sC1.b1 |
D080930.1 | TWP/MPL/C1 - Missing data | twpmplpolC1.b1, twpmplpolavgC1.c1, twpmplpolavgC1.s1 |
D090217.1 | TWP/MPL/C2 - Laser transmitter off | twpmplpolC2.b1, twpmplpolavgC2.c1, twpmplpolavgC2.s1 |
Subject: | TWP/SKYRAD/C1 - Reprocess: Incorrect datalogger program affecting PIR1 and PIR2 downwelling longwave |
DataStreams: | twpskyrad20sC1.a0, twpskyrad60sC1.b1
|
Description: | The excitation delays using in measuring the PIR1 case thermistor commonly named "Case1"
and the PIR2 dome thermistor called "Dome2" were discovered to have been incorrectly set
to 0 in the Skyrad datalogger program when the new CR23X based Skyrad loggers were
installed. The result of no delay in these measurements results in an error in the measured
resistance of the thermistors, Case1 and Dome2, and thus the calculated PIR1 and PIR2
irradiances. The absolute value of the errors are inversely proportial to temperature.
Users can apply temperature dependent irradiance corrections shown in the table below.
Recall that the reported uncertainty of PIRs is typically +-.25% to +-.5% or 1 to 2 W/m2.
The error corrections become the same order of magnitude or larger than the instrument
uncertainties at or below 260K or 9F.
Irradiance Correction Table for Skyrad (TWP and NSA) DIR1 and DIR2 Irradiance
DIR1 DIR1 DIR2 DIR2
T[F] Tcase[K] Correction[W/m2] Tdome[K]
Correction[W/m2]
109.4 316.13 0.00 316.13 0.00
100.5 311.20 -0.15 311.20 0.12
93.2 307.14 -0.12 307.14 0.10
87.0 303.70 -0.10 303.70 0.08
81.6 300.70 -0.17 300.70 0.14
77.0 298.15 -0.22 298.15 0.18
59.4 288.35 -0.34 288.35 0.27
47.4 281.72 -0.23 281.72 0.18
38.5 276.74 -0.42 276.74 0.34
31.3 272.77 -0.48 272.77 0.38
25.4 269.48 -0.61 269.48 0.49
20.3 266.67 -0.67 266.67 0.54
16.0 264.25 -0.82 264.25 0.66
12.1 262.11 -0.98 262.11 0.79
8.7 260.19 -0.97 260.19 0.78
5.6 258.46 -1.07 258.46 0.86
2.7 256.89 -1.17 256.89 0.94
0.1 255.44 -1.33 255.44 1.07
-2.3 254.11 -1.41 254.11 1.13
-4.5 252.87 -1.43 252.87 1.15
-6.6 251.71 -1.52 251.71 1.22
-8.5 250.63 -1.63 250.63 1.31
-10.4 249.62 -1.73 249.62 1.39
-12.2 248.58 -1.79 248.58 1.44
-15.4 246.82 -1.93 246.82 1.55
-18.3 245.23 -2.05 245.23 1.65
-20.9 243.78 -2.22 243.78 1.78
-23.3 242.44 -2.36 242.44 1.89
-25.5 241.21 -2.58 241.21 2.07
-27.5 240.07 -2.65 240.07 2.13
-29.5 239.01 -2.75 239.01 2.21
-31.3 238.00 -3.02 238.00 2.42 |
Measurements: | twpskyrad20sC1.a0: - inst_down_long_shaded1_dome_resist
- Irradiance, longwave, downwelling, hemispheric, thermopile (Shaded Pyrgeometer1)(inst_down_long_hemisp_shaded1_tp)
- inst_down_long_shaded1_case_resist
- inst_down_long_shaded2_case_resist
- Irradiance, longwave, downwelling, hemispheric, thermopile (Shaded Pyrgeometer2)(inst_down_long_hemisp_shaded2_tp)
- inst_down_long_shaded2_dome_resist
twpskyrad60sC1.b1: - down_long_hemisp_shaded2_min
- down_long_hemisp_shaded2_std
- down_long_hemisp_shaded1_min
- down_long_hemisp_shaded2_max
- down_long_hemisp_shaded1_std
- Irradiance, longwave, downwelling, hemispheric, shaded pyrgeometer2(down_long_hemisp_shaded2)
- down_long_hemisp_shaded1_max
- Irradiance, longwave, downwelling, hemispheric, shaded pyrgeometer1(down_long_hemisp_shaded1)
|
Subject: | TWP/SKYRAD/C2 - Reprocess: Incorrect datalogger program affecting PIR1 and PIR2 downwelling longwave |
DataStreams: | twpskyrad20sC2.a0, twpskyrad60sC2.b1
|
Description: | The excitation delays using in measuring the PIR1 case thermistor commonly named "Case1"
and the PIR2 dome thermistor called "Dome2" were discovered to have been incorrectly set
to 0 in the Skyrad datalogger program when the new CR23X based Skyrad loggers were
installed. The result of no delay in these measurements results in an error in the measured
resistance of the thermistors, Case1 and Dome2, and thus the calculated PIR1 and PIR2
irradiances. The absolute value of the errors are inversely proportial to temperature.
Users can apply the temperature dependent irradiance corrections shown in the table below.
Recall that the reported uncertainty of PIRs is typically +-.25% to +-.5% or 1 to 2
W/m2. The error corrections become the same order of magnitude or larger than the instrument
uncertainties at or below 260K or 9F.
Irradiance Correction Table for Skyrad (TWP and NSA) DIR1 and DIR2 Irradiance
DIR1 DIR1 DIR2 DIR2
T[F] Tcase[K] Correction[W/m2] Tdome[K]
Correction[W/m2]
109.4 316.13 0.00 316.13 0.00
100.5 311.20 -0.15 311.20 0.12
93.2 307.14 -0.12 307.14 0.10
87.0 303.70 -0.10 303.70 0.08
81.6 300.70 -0.17 300.70 0.14
77.0 298.15 -0.22 298.15 0.18
59.4 288.35 -0.34 288.35 0.27
47.4 281.72 -0.23 281.72 0.18
38.5 276.74 -0.42 276.74 0.34
31.3 272.77 -0.48 272.77 0.38
25.4 269.48 -0.61 269.48 0.49
20.3 266.67 -0.67 266.67 0.54
16.0 264.25 -0.82 264.25 0.66
12.1 262.11 -0.98 262.11 0.79
8.7 260.19 -0.97 260.19 0.78
5.6 258.46 -1.07 258.46 0.86
2.7 256.89 -1.17 256.89 0.94
0.1 255.44 -1.33 255.44 1.07
-2.3 254.11 -1.41 254.11 1.13
-4.5 252.87 -1.43 252.87 1.15
-6.6 251.71 -1.52 251.71 1.22
-8.5 250.63 -1.63 250.63 1.31
-10.4 249.62 -1.73 249.62 1.39
-12.2 248.58 -1.79 248.58 1.44
-15.4 246.82 -1.93 246.82 1.55
-18.3 245.23 -2.05 245.23 1.65
-20.9 243.78 -2.22 243.78 1.78
-23.3 242.44 -2.36 242.44 1.89
-25.5 241.21 -2.58 241.21 2.07
-27.5 240.07 -2.65 240.07 2.13
-29.5 239.01 -2.75 239.01 2.21
-31.3 238.00 -3.02 238.00 2.42 |
Measurements: | twpskyrad60sC2.b1: - down_long_hemisp_shaded1_max
- down_long_hemisp_shaded2_min
- down_long_hemisp_shaded1_std
- down_long_hemisp_shaded1_min
- down_long_hemisp_shaded2_std
- down_long_hemisp_shaded2_max
- Irradiance, longwave, downwelling, hemispheric, shaded pyrgeometer2(down_long_hemisp_shaded2)
- Irradiance, longwave, downwelling, hemispheric, shaded pyrgeometer1(down_long_hemisp_shaded1)
twpskyrad20sC2.a0: - inst_down_long_shaded1_case_resist
- inst_down_long_shaded2_dome_resist
- inst_down_long_shaded1_dome_resist
- Irradiance, longwave, downwelling, hemispheric, thermopile (Shaded Pyrgeometer1)(inst_down_long_hemisp_shaded1_tp)
- inst_down_long_shaded2_case_resist
- Irradiance, longwave, downwelling, hemispheric, thermopile (Shaded Pyrgeometer2)(inst_down_long_hemisp_shaded2_tp)
|
Subject: | TWP/SKYRAD/C2 - Short direct normal |
DataStreams: | twpskyrad20sC2.a0, twpskyrad60sC2.b1
|
Description: | The short_direct_normal (NIP) data are missing or incorrect due to instrument cable
failure. The cable was replaced.
The short_direct_normal can be calculated using the following relationship for shortwave
radiometers:
global hemispheric = diffuse hemispheric + direct normal *cos (zenith angle) |
Measurements: | twpskyrad60sC2.b1: - Shortwave Direct Normal Irradiance, Pyrheliometer, Maxima(short_direct_normal_max)
- Shortwave Direct Normal Irradiance, Pyrheliometer, Minima(short_direct_normal_min)
- short_direct_normal_std
- Radiation, shortwave, direct normal irradiance, 1-min avg(short_direct_normal)
twpskyrad20sC2.a0:
|
Subject: | TWP/SKYRAD/C2 - Reprocessed: Incorrect calibrations |
DataStreams: | twpskyrad20sC2.a0, twpskyrad60sC2.b1
|
Description: | The SKYRAD PSPs were changed out 11/25 but the datalogger program was not updated until
11/30.
Reprocessed to correct calibration per:
down_short_diffuse(corrected) = down_short_diffuse(orig) * (118.18/112.42)
short_direct_normal(corrected)= short_direct_normal(orig) * (122.20/118.11)
down_short_hemips(corrected) = down_short_hemisp(orig) * (133.16/137.57)
Reprocessing completed March 2008. |
Measurements: | twpskyrad60sC2.b1: - Radiation, shortwave, downwelling diffuse hemispheric irradiance, 1-min avg(down_short_diffuse_hemisp)
- Radiation, shortwave, downwelling total hemispheric irradiance, 1-min avg(down_short_hemisp)
- Shortwave Direct Normal Irradiance, Pyrheliometer, Maxima(short_direct_normal_max)
- Shortwave Direct Normal Irradiance, Pyrheliometer, Minima(short_direct_normal_min)
- short_direct_normal_std
- Radiation, shortwave, direct normal irradiance, 1-min avg(short_direct_normal)
- Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyranometer, Maxima(down_short_hemisp_max)
- down_short_diffuse_hemisp_std
- Downwelling Shortwave Diffuse Hemisp. Irrad., Ventilated Pyranometer, Minima(down_short_diffuse_hemisp_min)
- Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyranometer, Minima(down_short_hemisp_min)
- down_short_hemisp_std
- Downwelling Shortwave Diffuse Hemisp. Irrad., Ventilated Pyranometer, Maxima(down_short_diffuse_hemisp_max)
twpskyrad20sC2.a0: - inst_diffuse
- inst_direct_normal
- inst_global
|
Subject: | TWP/SKYRAD/C1 - Failed PSP ventilator fan |
DataStreams: | twpskyrad20sC1.a0, twpskyrad60sC1.b1
|
Description: | On 1/31 the ventilator for the PSP measuring downwelling_shortwave_hemispheric irradiance
failed. The DQ effect of this failure on the measurement of down_short_hemisp is not
possible to fully quantify but it has been noted that during these failures the PSP
nighttime values can be several (1-3W/m2) smaller than usual. Another effect is slower thermal
response (1hr) of the PSP instrument due to daytime heating and cooling of the ventilator
housing. |
Measurements: | twpskyrad20sC1.a0:
twpskyrad60sC1.b1: - Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyranometer, Minima(down_short_hemisp_min)
- down_short_hemisp_std
- Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyranometer, Maxima(down_short_hemisp_max)
- Radiation, shortwave, downwelling total hemispheric irradiance, 1-min avg(down_short_hemisp)
|
Subject: | TWP/SKYRAD/C2 - Direct Normal reading too low |
DataStreams: | twpskyradC2.00, twpskyrad20sC2.a0, twpskyrad60sC2.b1
|
Description: | The NIP (direct_normal shortwave irradiance) measurement was reading too low during this
time period. No TWP Ops documentation could be found to determine the cause but data
review indicate that the NIP appeared to be reading low by about 25W/m2 during this period.
The NIP data had well defined steps in irradiance when compared to three component checks
indicating the problem period. |
Measurements: | twpskyradC2.00: - Raw data stream - documentation not supported
twpskyrad60sC2.b1: - Shortwave Direct Normal Irradiance, Pyrheliometer, Maxima(short_direct_normal_max)
- Shortwave Direct Normal Irradiance, Pyrheliometer, Minima(short_direct_normal_min)
- short_direct_normal_std
- Radiation, shortwave, direct normal irradiance, 1-min avg(short_direct_normal)
twpskyrad20sC2.a0:
|
Subject: | TWP/SKYRAD/C1 - Tracker Failure |
DataStreams: | twpskyrad20sC1.a0, twpskyrad60sC1.b1
|
Description: | The solar tracker at C1 failed to wake up the morning of 6/10 approximately 2000GMT. Ops
discovered problem and reset tracker 6/12 approximately 0800GMT.
Tracker dependent instrument data is inaccurate - this includes the short_direct (NIP) and
down_short_diffuse_hemisp (8-48). The down_short_hemisp (PSP) and down_long_hemisp (PIR)
are unaffected. |
Measurements: | twpskyrad20sC1.a0: - inst_diffuse
- inst_direct_normal
twpskyrad60sC1.b1: - Shortwave Direct Normal Irradiance, Pyrheliometer, Minima(short_direct_normal_min)
- Downwelling Shortwave Diffuse Hemisp. Irrad., Ventilated Pyranometer, Maxima(down_short_diffuse_hemisp_max)
- short_direct_normal_std
- Shortwave Direct Normal Irradiance, Pyrheliometer, Maxima(short_direct_normal_max)
- down_short_diffuse_hemisp_std
- Radiation, shortwave, direct normal irradiance, 1-min avg(short_direct_normal)
- Downwelling Shortwave Diffuse Hemisp. Irrad., Ventilated Pyranometer, Minima(down_short_diffuse_hemisp_min)
- Radiation, shortwave, downwelling diffuse hemispheric irradiance, 1-min avg(down_short_diffuse_hemisp)
|
Subject: | TWP/MPL/C1 - Laser not transmitting |
DataStreams: | twpmplpolC1.b1, twpmplpolavgC1.c1, twpmplpolavgC1.s1
|
Description: | Laser was not turned on with remainder of system following power failure. |
Measurements: | twpmplpolavgC1.c1: - Pressure, associated geometric height, at altitude, NGM model output(height)
- time
- dead_time_corrected
- nsamples_cross_pol_average
- range_bin_width
- max_altitude
- time_offset
- polarization_control_voltage_cross_pol
- alt
- detector_temp
- scope_temp
- nsamples_co_pol_average
- Attenuated backscatter, cross pol(signal_return_cross_pol)
- base_time
- Attenuated backscatter, copol(signal_return_co_pol)
- background_signal_std_cross_pol
- range
- shots_per_sample
- Preliminary cloud base height above ground level, cross-pol(preliminary_cbh_cross_pol)
- num_channels
- lon
- aqc_signal_return_cross_pol
- num_bins
- aqc_signal_return_co_pol
- energy_monitor
- range_bins
- background_signal_cross_pol
- lat
- background_signal_std_co_pol
- background_signal_co_pol
- laser_temp
- polarization_control_voltage_co_pol
- pulse_rep
- Preliminary cloud base height above ground level, co-pol(preliminary_cbh_co_pol)
- range_offset
twpmplpolavgC1.s1: - range
- Attenuated backscatter, copol(signal_return_co_pol)
- polarization_control_voltage_cross_pol
- laser_temp
- Preliminary cloud base height above ground level, cross-pol(preliminary_cbh_cross_pol)
- background_signal_std_co_pol
- dead_time_corrected
- range_offset
- time_offset
- time
- range_bin_width
- shots_per_sample
- Attenuated backscatter, cross pol(signal_return_cross_pol)
- num_channels
- nsamples_cross_pol_average
- Preliminary cloud base height above ground level, co-pol(preliminary_cbh_co_pol)
- alt
- detector_temp
- num_bins
- background_signal_cross_pol
- max_altitude
- Pressure, associated geometric height, at altitude, NGM model output(height)
- polarization_control_voltage_co_pol
- nsamples_co_pol_average
- lon
- lat
- pulse_rep
- background_signal_std_cross_pol
- energy_monitor
- base_time
- range_bins
- scope_temp
- aqc_signal_return_co_pol
- background_signal_co_pol
- aqc_signal_return_cross_pol
twpmplpolC1.b1: - dead_time_corrected
- signal_return
- num_bins
- num_channels
- range_bin_time
- alt
- Pressure, associated geometric height, at altitude, NGM model output(height)
- scope_temp
- time
- background_signal_std
- pulse_rep
- time_offset
- polarization_control
- range_bins
- range_bin_width
- range_offset
- energy_monitor
- lon
- max_altitude
- shots_per_avg
- detector_temp
- polarization_control_voltage
- range
- lat
- Preliminary cloud base height above ground level(preliminary_cbh)
- background_signal
- laser_temp
- base_time
|
Subject: | TWP/MPL/C1 - Missing data |
DataStreams: | twpmplpolC1.b1, twpmplpolavgC1.c1, twpmplpolavgC1.s1
|
Description: | Data are missing and unrecoverable. |
Measurements: | twpmplpolavgC1.c1: - Pressure, associated geometric height, at altitude, NGM model output(height)
- time
- dead_time_corrected
- nsamples_cross_pol_average
- range_bin_width
- max_altitude
- time_offset
- polarization_control_voltage_cross_pol
- alt
- detector_temp
- scope_temp
- nsamples_co_pol_average
- Attenuated backscatter, cross pol(signal_return_cross_pol)
- base_time
- Attenuated backscatter, copol(signal_return_co_pol)
- background_signal_std_cross_pol
- range
- shots_per_sample
- Preliminary cloud base height above ground level, cross-pol(preliminary_cbh_cross_pol)
- num_channels
- lon
- aqc_signal_return_cross_pol
- num_bins
- aqc_signal_return_co_pol
- energy_monitor
- range_bins
- background_signal_cross_pol
- lat
- background_signal_std_co_pol
- background_signal_co_pol
- laser_temp
- polarization_control_voltage_co_pol
- pulse_rep
- Preliminary cloud base height above ground level, co-pol(preliminary_cbh_co_pol)
- range_offset
twpmplpolavgC1.s1: - range
- Attenuated backscatter, copol(signal_return_co_pol)
- polarization_control_voltage_cross_pol
- laser_temp
- Preliminary cloud base height above ground level, cross-pol(preliminary_cbh_cross_pol)
- background_signal_std_co_pol
- dead_time_corrected
- range_offset
- time_offset
- time
- range_bin_width
- shots_per_sample
- Attenuated backscatter, cross pol(signal_return_cross_pol)
- num_channels
- nsamples_cross_pol_average
- Preliminary cloud base height above ground level, co-pol(preliminary_cbh_co_pol)
- alt
- detector_temp
- num_bins
- background_signal_cross_pol
- max_altitude
- Pressure, associated geometric height, at altitude, NGM model output(height)
- polarization_control_voltage_co_pol
- nsamples_co_pol_average
- lon
- lat
- pulse_rep
- background_signal_std_cross_pol
- energy_monitor
- base_time
- range_bins
- scope_temp
- aqc_signal_return_co_pol
- background_signal_co_pol
- aqc_signal_return_cross_pol
twpmplpolC1.b1: - dead_time_corrected
- signal_return
- num_bins
- num_channels
- range_bin_time
- alt
- Pressure, associated geometric height, at altitude, NGM model output(height)
- scope_temp
- time
- background_signal_std
- pulse_rep
- time_offset
- polarization_control
- range_bins
- range_bin_width
- range_offset
- energy_monitor
- lon
- max_altitude
- shots_per_avg
- detector_temp
- polarization_control_voltage
- range
- lat
- Preliminary cloud base height above ground level(preliminary_cbh)
- background_signal
- laser_temp
- base_time
|
Subject: | TWP/MPL/C2 - Laser transmitter off |
DataStreams: | twpmplpolC2.b1, twpmplpolavgC2.c1, twpmplpolavgC2.s1
|
Description: | The laser diode power supply was inadvertantly turned off by the operators. Upon correct
restarting sequence, system returned to normal. |
Measurements: | twpmplpolavgC2.s1: - aqc_signal_return_cross_pol
- num_bins
- lat
- Preliminary cloud base height above ground level, cross-pol(preliminary_cbh_cross_pol)
- range_offset
- Attenuated backscatter, copol(signal_return_co_pol)
- range
- background_signal_cross_pol
- Pressure, associated geometric height, at altitude, NGM model output(height)
- shots_per_sample
- laser_temp
- time
- nsamples_co_pol_average
- scope_temp
- range_bins
- polarization_control_voltage_co_pol
- aqc_signal_return_co_pol
- time_offset
- base_time
- Preliminary cloud base height above ground level, co-pol(preliminary_cbh_co_pol)
- detector_temp
- num_channels
- background_signal_co_pol
- polarization_control_voltage_cross_pol
- pulse_rep
- alt
- background_signal_std_co_pol
- Attenuated backscatter, cross pol(signal_return_cross_pol)
- lon
- energy_monitor
- nsamples_cross_pol_average
- range_bin_width
- max_altitude
- dead_time_corrected
- background_signal_std_cross_pol
twpmplpolavgC2.c1: - time_offset
- max_altitude
- aqc_signal_return_cross_pol
- Attenuated backscatter, cross pol(signal_return_cross_pol)
- polarization_control_voltage_cross_pol
- num_channels
- range
- background_signal_cross_pol
- Attenuated backscatter, copol(signal_return_co_pol)
- Preliminary cloud base height above ground level, co-pol(preliminary_cbh_co_pol)
- laser_temp
- lon
- detector_temp
- scope_temp
- base_time
- Pressure, associated geometric height, at altitude, NGM model output(height)
- shots_per_sample
- range_bin_width
- background_signal_std_co_pol
- background_signal_std_cross_pol
- dead_time_corrected
- polarization_control_voltage_co_pol
- range_offset
- alt
- nsamples_cross_pol_average
- energy_monitor
- range_bins
- pulse_rep
- num_bins
- time
- background_signal_co_pol
- nsamples_co_pol_average
- Preliminary cloud base height above ground level, cross-pol(preliminary_cbh_cross_pol)
- aqc_signal_return_co_pol
- lat
twpmplpolC2.b1: - lon
- detector_temp
- polarization_control
- range_bin_time
- max_altitude
- scope_temp
- Pressure, associated geometric height, at altitude, NGM model output(height)
- background_signal_std
- base_time
- signal_return
- shots_per_avg
- background_signal
- range_bins
- time
- range_bin_width
- time_offset
- dead_time_corrected
- num_channels
- num_bins
- laser_temp
- lat
- range
- polarization_control_voltage
- energy_monitor
- pulse_rep
- range_offset
- alt
- Preliminary cloud base height above ground level(preliminary_cbh)
|