Configuring netCDF reporting - CL61

CL61 User Guide

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When you have set up the data collection in CL61, CL61 starts generating netCDF files. To customize the data output, you can define an averaging scheme for the measurements, and set netCDF attributes and netCDF file naming.

  1. Change the user level.
    level 1
  2. Define the averaging settings.
    set algo.1averaging.interval <averaging interval>
    set algo.1averaging.depolinterval <averaging interval>
    set reporting.profile.interval <profile interval>
    set reporting.livefile.profilesperfile <number of profiles>

    The maximum averaging is 2 minutes inside CL61. If you want additional averaging, do this outside CL61, for example, in Matlab.

    The backscatter profiles and the depolarization ratio profile have separate averaging schemes.

    The interval parameters are a multiple of 5-second profiles (n × 5).

    The following table shows examples of measurement averaging schemes.

    Parameter Value
    5 profiles with 1-minute averaging, 5-minute file
    algo.l1averaging.interval 12
    algo.l1averaging.depolinterval 12
    reporting.profile.interval 12
    reporting.livefile.profilesperfile 5
    12 profiles with 5-second averaging, 1-minute file
    algo.l1averaging.interval 1
    algo.l1averaging.depolinterval 2
    reporting.profile.interval 1
    reporting.livefile.profilesperfile 12
    24 ABS profiles with 5-second averaging, 24 DEPOL profiles with 1-minute rolling averaging, 2‑minute file
    algo.l1averaging.interval 1
    algo.l1averaging.depolinterval 12
    reporting.profile.interval 1
    reporting.livefile.profilesperfile 24
    30 profiles with 2-minute averaging, 60-minute file
    algo.l1averaging.interval 24
    algo.l1averaging.depolinterval 24
    reporting.profile.interval 24
    reporting.livefile.profilesperfile 30

    The following table explains the parameters.

    Parameter Description Value / range Default

    Averaging interval for ABS, XPOL, and PPOL in L1 / Number of 5 s profiles averaged in each x‑polarization (XPOL), p‑polarization (PPOL), and attenuated backscatter profile (ABS)

    Averaging refers to the running average, so for every 5 s profile, this parameter averages the number of previous profiles. The algorithm produces profiles in 5 second intervals.

    You can specify that profiles recorded in netCDF files are averaged by n × 5 s, where n = 1 … 24.

    NOTE: Vaisala recommends setting n = 1 to enable the reprocessing of archived data sets with new algorithms in the future. While it may be useful to have n > 1 for compact file sizes, this limits reprocessing.

    1 … 24




    Averaging interval for depol in L1 / Number of 5 s profiles averaged in each depolarization profile

    For every 5-second profile, this parameter averages the number of previous profiles. The algorithm produces profiles in 5-second intervals.

    1 … 24



    Interval for reporting to write out profiles

    Only every nth profile is written to the netCDF file where the n is this parameter.

    This parameter can be used to avoid overlapping averaging. For example, if algo.l1averaging.interval is set to 6 corresponding to a 30 s time span, this parameter can be set to 6 as well to get the profiles every 30 s.

    1 ... no maximum




    Number of profiles that are written in each .nc file

    If reporting.profile.interval is set to 6 and this parameter is set to 4, one netCDF file will cover 2 min of data (6 × 4 × 5 s).

    1 … 1440


  3. Define the reporting unit (meters or feet).

    The measurements are always done in meters and the conversion to feet is done before writing the netCDF file.

    set reporting.netcdf.unit <m∣f>
  4. Define what metadata to include in the netCDF files if needed.
    set reporting.netcdf.institution 
    set reporting.netcdf.comment 
  5. Define how the netCDF files are named using prefixes if needed.
    set reporting.livefile.nameprefix <prefix>
    set cl.sender.fileprefix <prefix>
    Parameter Description
    reporting.livefile.nameprefix Adds user-selected prefix to the netCDF file when transferring the file to the customer server. Used to distinguish between live and archive files.
    cl.sender.fileprefix Adds user-selected prefix to netCDF file when transferring the file to the customer server. Used to distinguish files coming from different CL61 devices.

    The filename format is the following: <cl.sender.fileprefix><reporting.livefile.nameprefix>

  6. Use the get command to check the changed configuration.
    get algo
    get reporting

The changes are visible in the netCDF files immediately.