DOI: 10.5281/zenodo.4352131
title: Radar measurements for the article "Dynamic differential reflectivity calibration using vertical profiles in rain and snow"

description: <strong>Dataset documentation</strong> The archives in hdf5 format provided at this link contain the datasets used in the manuscript <em>Dynamic differential reflectivity calibration using vertical profiles in rain and snow</em>, submitted to <em>Remote Sensing</em> (MDPI) by Alfonso Ferrone and Alexis Berne in 2020. <strong>File content</strong> Each file is structured as a table, with each column referring to a specific variable and each row containing a different realization (in space or time). The set of available variables is campaign dependent, and the possibilities are: <strong>idx</strong>, and integer index that starts at 1 for the first scan of the dataset and increases by 1 for every successive scan; <strong>t</strong>, the timestamp of the scan, in seconds since seconds since Jan 01, 1970; <strong>r</strong> or <strong>rg</strong> (depending on the file), the distance from the radar in meters; <strong>az</strong>, the azimuth angle in degrees; <strong>el</strong>, the elevation angle in degrees; <strong>zdr</strong>, the uncalibrated differential reflectivity, in dB; <strong>zh</strong>, the horizontal reflectivity, in dBZ; <strong>rhovh</strong> or <strong>rho</strong>, the co-polar correlation coefficient, unitless; <strong>snr_h</strong> or <strong>snr</strong>, the signal to noise ratio for the horizontal channel in dB; <strong>snrv</strong>, the signal to noise ratio for the vertical channel, in dB, <strong>ngates</strong>, the number of unique range gates. For the comparison of the data collected by MXPol and DX50 during the PAYERNE campaign, two auxiliary variables were added to the archives: <strong>x</strong> the horizontal distance from the current radar, computed on a line passing through the location of two radars; <strong>z</strong> the vertical distance from the current radar. <strong>Usage</strong> The dataset are provided in the the Hierarchical Data Format version 5 (HDF5), an open source file format, supported by several programming language. They archives were created using the <em>vaex</em> library for Python 3: https://github.com/vaexio/vaex The function <em>vaex.open</em> from the same library can be used for accessing the archives and converting them to <em>vaex.DataFrame</em>. <strong>Campaign-specific information</strong> Some of the parameters associated to the variables included in the archives may change depending on the campaign. The following subsection provide a summary of these information. <strong>dataframe_HYMEX_2013_from_20130907-040344_to_20131105-175944.hdf5</strong> Contains PPI scans at 90° elevation for the HYMEX campaign. Location information: Latitude: 44.61° N Longitude: 4.55° E Altitude: 604 m.a.s.l. Technical information: Radar Frequency: 9.41 GHz Theoretical 3 dB angular beamwidth of the antenna: 1.45° Scan setup: Range resolution: 75 m Range to the first gate: 204.3 m Processsing parameters: Clutter filtering: OFF Minimum rhohv: 0.6 Attenuation correction: Z-PHI method Note on reflectivity calibration: The original manufacturer calibration constant was 7.56 dBZ. The value used here derives from comparison with disdrometers during the HYMEX campaign. <strong>dataframe_PAYERNE_2014_from_20140321-160016_to_20140519-085808.hdf5</strong> Contains PPI scans at 90° elevation performed by MXPol during the PAYERNE campaign. Location information: Latitude: 46.81° N Longitude: 6.94° E Altitude: 496 m.a.s.l. Technical information: Radar Frequency: 9.41 GHz Theoretical 3 dB angular beamwidth of the antenna: 1.45° Scan setup: Range resolution: 75 m Range to the first gate: 204.3 m Processsing parameters: Clutter filtering: OFF Minimum rhohv: 0.6 Attenuation correction: None <strong>dataframe_DAVOS_2014_from_20140704-090224_to_20141231-105720.hdf5</strong> Contains PPI scans at 90° elevation for the DAVOS campaign. Location information: Latitude: 46.82° N Longitude: 9.82° E Altitude: 2220 m.a.s.l. Technical information: Radar Frequency: 9.41 GHz Theoretical 3 dB angular beamwidth of the antenna: 1.45° Scan setup: Range resolution: 75 m Range to the first gate: 204.3 m Processsing parameters: Clutter filtering: OFF Minimum rhohv: 0.6 Attenuation correction: None <strong>dataframe_APRES3_from_20151207-123944_to_20160129-125856.hdf5</strong> Contains PPI scans at 90° elevation for the APRES3 campaign. Location information: Latitude: 66.66 S Longitude: 140.00 E Altitude: 40 m.a.s.l. Technical information: Radar Frequency: 9.41 GHz Theoretical 3 dB angular beamwidth of the antenna: 1.45° Scan setup: Range resolution: 75 m Range to the first gate: 354.3 m Processsing parameters: Clutter filtering: OFF Minimum rhohv: 0.6 Attenuation correction: None <strong>dataframe_VALAIS_2016_from_20161104-154312_to_20170306-195912.hdf5</strong> Contains PPI scans at 90° elevation for the VALAIS campaign. Location information: Latitude: 46.12 N Longitude: 7.10 E Altitude: 460 m.a.s.l. Technical information: Radar Frequency: 9.41 GHz Theoretical 3 dB angular beamwidth of the antenna: 1.27° Scan setup: Range resolution: 30 m Range to the first gate: 226.95 m Processsing parameters: Clutter filtering: OFF Minimum rhohv: 0.6 Attenuation correction: None <strong>dataframe_DX50_from_20140501-020000_to_20140524-015752.hdf5</strong> Contains PPI scans at 90° elevation performed by DX50 during the PAYERNE campaign. Location information: Latitude: 46.84° N Longitude: 6.92° E Altitude: 450 m.a.s.l. Technical information: Radar Frequency: 9.459 GHz Theoretical 3 dB angular beamwidth of the antenna: 1.273° Scan setup: Range resolution: 75 m Range to the first gate: 0.0 m Processsing parameters: Clutter filtering: OFF Minimum rhohv: 0.0 Attenuation correction: None <strong>dataframe_DX50_RHI_201405.hdf5</strong> Contains RHI scans from DX50 the PAYERNE campaign. The remaining information equal to the ones listed for <em>dataframe_DX50_from_20140501-020000_to_20140524-015752.hdf5</em>. <strong>dataframe_MXPol_RHI_201405.hdf5</strong> Contains RHI scans from MXPol the PAYERNE campaign. The remaining information is equal to the ones listed for <em>dataframe_PAYERNE_2014_from_20140321-160016_to_20140519-085808.hdf5</em>.