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Convert Metek MRR-2 micro rain radar data files to NetCDF.

mrr2c is an open source program which converts Metek Micro Rain Radar 2 (MRR-2) data to NetCDF. RAW, PRO and AVE files are supported.

Note: Previous versions produced HDF5 files. If you need this type of output for compatibility, use mrr2c version 1.0.3.


mrr2c [--debug] <input> <output>


  • input: Input MRR-2 .raw, .pro or .ave file.
  • output: Output NetCDF (.nc) file.


  • --debug: Enable debugging output.

See also the man page:

man mrr2c


It is recommended to run mrr2c on Linux or a unix-like operating system.


  • Python 3 or a compatible distribution of Python such as Anaconda

To install mrr2c and dependencies with the Python package manager:

pip3 install mrr2c

Note: Append --user to install in your home directory on an unix-like operating system (make sure ~/.local/bin is included in the PATH environmental variable).


Supported variables are listed in the table below.

Time is expressed as Julian date (fractional number of days since -4712-01-01 12:00 UTC, or -4713-11-24 12:00 UTC in the proleptic Gregorian calendar). To calculate UNIX time (number of seconds since 1 January 1970 00:00), use the formula (time - 2440587.5)*86400. The time zone depends on the raw data. Use the time_zone variable to determine the offset.

Missing values are expressed as NaN in the floating point (float64) variables and -9223372036854775808 in the integer (int64) variables. The _FillValue and missing_value attributes of each numerical variable contain the respective missing value.

Variable Units Symbol Description Type
attenuated_radar_reflectivity dbZ z Attenuated radar reflectivity float64
averaging_time s AVE Averaging time float64
band 1 Band number int64
bandwidth BW Bandwidth float64
calibration_constant CC Calibration constant float64
device_serial_number string DSN Device serial number S16
drop_size mm D Drop size float64
fall_velocity m.s-1 W Fall velocity float64
firmware_version string DVS Firmware version S16
height_resolution m STP Height resolution float64
height m H Height float64
level 1 Level number int64
liquid_water_content g.m-3 LWC Liquid water content float64
path_integrated_attenuation dB PIA Path integrated attenuation float64
processing_level string TYP Processing level S3
radar_altitude m ASL Radar altitude float64
radar_reflectivity dbZ Z Radar reflectivity float64
rain_rate mm.h-1 RR Rain rate float64
sampling_rate Hz SMP Sampling rate float64
service_version string SVS Service version S16
spectral_drop_density N Spectral drop density float64
spectral_reflectivity dB F Spectral reflectivity float64
time_zone string Time zone S8
time days since -4713-11-24 UTC (proleptic_gregorian calendar) Time float64
total_spectra 1 MDQ3 Number of total spectra int64
transfer_function TF Transfer function float64
valid_spectra_percentage % MDQ1 Percentage of valid spectra float64
valid_spectra 1 MDQ2 Number of valid spectra int64


Attribute Description
software mrr2c (
version Software version
created Time when the file was created (ISO 8601 UTC)

Release Notes

2.1.1 (2021-12-11)

  • Changed time variable calendar to proleptic_gregorian.
  • Dropped support for Python 2.

2.1.0 (2020-08-13)

  • Improved units to be more consistent with UDUNITS.

2.0.2 (2020-08-12)

  • Support for Python 3.
  • Changed output format to NetCDF.
  • Changed variable time to numerical.
  • Added variable level.
  • Named dimensions.
  • Added ancillary attributes.

1.0.3 (2020-07-18)

  • Fixed installation on Windows.

1.0.2 (2020-02-02)

  • Add man page.

1.0.1 (2017-09-30)

  • PyPI package.
  • Improved documentation.

1.0 (2017-06-09)

  • Initial release.


mrr2c can be used, modified and distributed freely under the terms of an MIT license (see


Please contact Peter Kuma <> regarding support or bugs or use the GitHub Issues.

See also

ALCF, ccplot, cl2nc, mpl2nc


Convert Metek MRR-2 micro rain radar data files to HDF