netcdf hope_lac_dlidCUST00_l1_any_1_6876736055753821851 {
dimensions:
time = 20842 ;
range = 192 ;
nv = 2 ;
variables:
float lat ;
lat:standard_name = "latitude" ;
lat:long_name = "latitude" ;
lat:units = "degrees_north" ;
float lon ;
lon:standard_name = "longitude" ;
lon:long_name = "longitude" ;
lon:units = "degrees_east" ;
short zsl ;
zsl:standard_name = "altitude" ;
zsl:long_name = "altitude above mean sea level" ;
zsl:units = "m" ;
float zenith(time) ;
zenith:standard_name = "zenith_angle" ;
zenith:long_name = "beam direction due zenith" ;
zenith:units = "degrees" ;
zenith:_FillValue = -999.f ;
float azi(time) ;
azi:standard_name = "sensor_azimuth_angle" ;
azi:long_name = "beam azimuth due reference point" ;
azi:units = "degrees" ;
azi:_FillValue = -999.f ;
float range(range) ;
range:long_name = "distance from sensor to center of range gates along the line of sight" ;
range:units = "m" ;
range:bounds = "range_bnds" ;
float range_bnds(range, nv) ;
double time(time) ;
time:standard_name = "time" ;
time:long_name = "time" ;
time:comments = "start time of measurement" ;
time:units = "seconds since 1970-01-01 00:00:00 UTC" ;
time:bounds = "time_bnds" ;
double time_bnds(time, nv) ;
float wl ;
wl:standard_name = "radiation_wavelength" ;
wl:long_name = "wavelength" ;
wl:units = "m" ;
float pd ;
pd:long_name = "pulse duration" ;
pd:comments = "Laser pulse width: duration of transmitted pulse pd = (2*dr)/c" ;
pd:units = "s" ;
float nsmpl ;
nsmpl:long_name = "number of sample points per range gate" ;
nsmpl:units = "1" ;
float nrg ;
nrg:long_name = "total number of range gates" ;
nrg:units = "1" ;
float npls(time) ;
npls:long_name = "total number of averaged pulses" ;
npls:comments = "Number of averaged pulses per velocity estimate. Variable is specific for the processing method of the HALO Doppler lidar, set to 1 for WILI." ;
npls:units = "1" ;
float resv ;
resv:long_name = "resolution of Doppler velocity" ;
resv:comments = "Interpolated value." ;
resv:units = "m s-1" ;
float tgint ;
tgint:long_name = "total observation time per range gate" ;
tgint:comments = "Time window used for gating time series of signal received on detector: tgint = (2.* [range_bounds(1,2)-range_bounds(1,1)])./c" ;
tgint:units = "s" ;
float smplf ;
smplf:long_name = "sampling frequency" ;
smplf:comments = "smplf = nsmpl/tgint" ;
smplf:units = "s-1" ;
float nqf ;
nqf:long_name = "nyquist frequency" ;
nqf:comments = "nqf = smplf/2" ;
nqf:units = "s-1" ;
float nqv ;
nqv:long_name = "nyquist velocity" ;
nqv:comments = "nqv = (nqf*wl)/2" ;
nqv:units = "m s-1" ;
float resf ;
resf:long_name = "frequency resolution" ;
resf:comments = "resf = smplf/nfft" ;
resf:units = "s-1" ;
float prf ;
prf:long_name = "pulse repetition frequency" ;
prf:comments = "prf = c/(2*[range_bounds(1,2)-range_bounds(1,1)]*nrg)" ;
prf:units = "s-1" ;
float intensity(time, range) ;
intensity:long_name = "backscatter intensity" ;
intensity:comments = "signal-to-noise-ratio + 1, value estimated" ;
intensity:units = "1" ;
intensity:_FillValue = -999.f ;
float beta(time, range) ;
beta:standard_name = "volume_attenuated_backwards_scattering_function_in_air" ;
beta:long_name = "attenuated backscatter coefficient" ;
beta:comments = "Determined from intensity by means of lidar equation. Uncalibrated." ;
beta:units = " m-1 sr-1" ;
beta:_FillValue = -999.f ;
float dv(time, range) ;
dv:standard_name = "radial_velocity_of_scatterers_away_from_instrument" ;
dv:long_name = "Doppler velocity" ;
dv:comments = "radial velocity: positive values indicate that target moves away from lidar" ;
dv:units = "m s-1" ;
dv:_FillValue = -999.f ;
byte qdv(time, range) ;
qdv:long_name = "quality mask of Doppler velocity" ;
qdv:comments = "Quality flag for beta and dv based on SNR_threshold which depends on npls (see data description document for values): 2=low quality due to near-range pulse effects, 1=good quality data, 0=low quality data. Only use data flagged with 1!" ;
qdv:units = "1" ;
float errdv(time, range) ;
errdv:long_name = "error of Doppler velocity" ;
errdv:comments = "For Wili no velocity error supplied." ;
errdv:units = "m s-1" ;
errdv:_FillValue = -999.f ;
// global attributes:
:Title = "Doppler Lidar (coherent measurement) data" ;
:Institution = "Leibniz Institut for Tropospheric Research (TROPOS), Leipzig, Germany" ;
:Contact_person = "Patric Seifert (, TROPOS, Permoserstr. 15, 04318 Leipzig, Germany)" ;
:Source = "WiLi Doppler lidar" ;
:History = "Data processed with process_lidar_hdcp2_0.1.2 and write_lidarnc_hdcp2_0.1.2 by TROPOS (Leibniz Institute for Tropospheric Research)" ;
:Dependencies = "External" ;
:Conventions = "basing on CF-1.6" ;
:Processing_date = "2017-10-07 19:25:27 (CET)" ;
:Author = "Anne Hirsikko ()" ;
:Comments = "Original data together with quality flag and velocity error are provided. For Wili no velocity error is supplied. Wili (WInd LIdar) is a custom-built Doppler lidar of TROPOS, thus some system parameters are not directly comparable to the ones for HALO, Lockheed or Leosphere systems." ;
:Licence = "For non-commercial use only. This data is subject to the SAMD data policy to be found at www.icdc.cen.uni-hamburg.de/projekte/samd.html and in the SAMD Observation Data Product standard." ;
}