SCC Documentation: docs/file_formats/low_resolution.rst@73345b4f532f (annotated)

docs/file_formats/low_resolution.rst@73345b4f532f (annotated)

docs/file_formats/low_resolution.rst

Wed, 14 Nov 2018 17:17:04 +0200

author: Ioannis <ioannis@inoe.ro>
date: Wed, 14 Nov 2018 17:17:04 +0200
changeset 115: 73345b4f532f
parent 103: afbca7e2ba25
permissions: -rw-r--r--

High resolution file (wrong content)

 Low Resolution SCC L1 Products
 ==============================
 .. warning::
   This section is still under development.
 Introduction
 ------------
 The Single Calculus Chain (SCC) is the standard EARLINET tool to perform
 automatic and quality nchecked analysis of raw lidar data. It is
 composed by three different modules:
 -  ELPP (EARLINET Lidar Pre-Processor)
 -  ELDA (EARLINET Lidar Data Analizer)
 -  ELDEC (EARLINET Lidar DEpolarization Calibrator)
 Whenever an input file containing raw lidar data has been submitted to
 the SCC ELPP is automatically ran on it. The ELPP module pre-processes
 the raw data performing all the corrections and data handling needed
 before the optical retrieval algorithms can be applied by ELDA module.
 The ELPP output files contain pre-processed range corrected signals
 corrected for instrumental effects as well as atmospheric molecular
 parameters calculated from standard model or radiosounding. Typically,
 the vertical and temporal resolutions of the pre-processed signals
 included in these files is lower than the raw vertical and temporal
 resolution as in general time/vertical integration is performed by ELPP
 to increase the SNR and allow the calculation of optical products with a
 reduced uncertainties. As a consequence the ELPP output files are called
 Low Resolution SCC L1 Products. Another SCC module (HiRELPP – High
 Resolution EARLINET Lidar Pre-Processor) currently under development
 will produce High Resolution SCC L1 Products in which both time and
 vertical resolution are kept as higher as possible.
 This document provides a detailed description about the structure and
 the format of Low Resolution SCC L1 Product as produced by the SCC v4.0.
 Low Resolution SCC L1 Product: File format
 ------------------------------------------
 The Low Resolution SCC L1 Products are files in Network Common Data Form
 (NetCDF) which is a well known self-describing, machine-independent data
 format that support the creation, access, and sharing of array-oriented
 scientific data. For more information about NetCDF format:
 http://www.unidata.ucar.edu/software/netcdf/.
 The NetCDF is a binary format that allows the definition of
 multi-dimensional variables of several types (integers, double,
 character, etc). For each variable it is possible to define one or more
 attributes where to specify variable properties like units, long name,
 description, etc.
 It is possible to define global attributes which are not related to a
 specific variable but to the whole file.
 A NetCDF file is composed by four different section:
 dimensions
    this section contains all the dimensions used in the definition of
    all the variables included in the NetCDF file
 variables
    this section contains all the variables stored in the NetCDF file.
    Each variable is defined as a multi-dimensional array of a specific
    type and with all the dimensions defined in the dimensions section
 global attributes
    this section lists all the attributes referring to the whole file. As
    the variable the attributes (global or the one attached to a specific
    variable) can be of different type
 data
    in this section the data contained in each variable defined in
    variable section is stored. Attribute values (both global or related
    to a specific variable) are not reported in data section but directly
    in variable or global attribute sections.
 Each Low Resolution SCC L1 Product correspond to a single emission
 wavelength. For example it is possible to find in the same file the
 elastic and the Raman channel pre-processed time-series corresponding to
 the same emission wavelength (but to a different detection wavelengths)
 but not two elastic time-series referring to different emission
 wavelengths.
 Low Resolution SCC L1 Product Format: dimensions
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 The following dimensions are defined in the Low Resolution SCC L1
 Product:
 -  time
 -  points
 -  channels
 -  scan\_angles
 The dimension *time* specifies the number of RCS (for each channel)
 composing all the pre-processed time-series reported in the file.
 The dimension *points* represents the number of rangebins characterizing
 the pre-processed RCS. In case RCSs corresponding to different channels
 are characterized by different rangebins the dimension time is to the
 the maximum value of rangebins.
 The dimension *channels* indicates the number channels at which the RCS
 time-series included in the file refer to.
 The dimension *scan\_angles* takes into account how many zenith scan
 angles have been used to measure the RCS time-series reported into the
 file
 Low Resolution SCC L1 Product Format: variables
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 In this section all the possible Low Resolution SCC L1 Product variables
 are reported. There are some variables that are mandatory and have to be
 present in all the Low Resolution SCC L1 Product files while there are
 others that have to be present only in specific cases.
 Technical Variables
 ###################
 altitude\_resolution
     :Type: *double*
     :Dimensions: *scan\_angles*
     :Location: Included in all the Low Resolution SCC L1 Product files
     :Definition: ``double altitude_resolution(scan_angles)``
     This variable describes the altitude resolution
     corresponding to the RCS time-series reported in the file. It is needed
     to compute the vertical scale of the RCS corresponding to each scan
     angle which should be calculated as it follow:
     .. math::
         H(\alpha, z)= \Delta h(\alpha)\left(z + \frac{1}{2}\right)
     where *z* is the altitude, :math:`\alpha` is the scan angle value and :math:`\Delta h` is the
     value reported by *altitude\_resolution* variable.
 range\_resolution
     :Type: *double*
     :Dimensions: *scan\_angles*
     :Location: Included in all the Low Resolution SCC L1 Product files
     :Definition: ``double range_resolution(scan_angles)``
     This variable describes the range resolution corresponding
     to the RCS time-series reported in the file. It is needed to compute the
     range scale of the RCS corresponding to each scan angle which should be
     calculated as it follow:
     .. math::
             R(\alpha, z)= \Delta r(\alpha)\left(r + \frac{1}{2}\right)
     where *r* is the range, :math:`\alpha` is the scan angle value and :math:`\Delta r` is the
     value reported by *range\_resolution* variable. Altitude and range
     resolution are the same if the scan angle is zero (zenith acquisition).
 laser\_pointing\_angle
     :Type: *double*
     :Dimensions: *scan\_angles*
     :Location: Included in all the Low Resolution SCC L1 Product files
     :Definition: ``double laser_pointing_angle(scan_angles)``
     This variable provides the value of the zenith scan angles
     used during the measurement. The value of angle are in degrees with
     respect to the zenith direction.
 emission\_wavelength
     :Type: *double*
     :Dimensions: *channels*
     :Location: Included in all the Low Resolution SCC L1 Product files
     :Definition: ``double emission_wavelength(channels)``
     This variable provides the value of the emission wavelength
     (in nm) corresponding to each RCS time-series.
 detection\_wavelength
     :Type: *double*
     :Dimensions: *channels*
     :Location: Included in all the Low Resolution SCC L1 Product files
     :Definition: ``double detection_wavelength(channels)``
     This variable provides the value of the detection
     wavelength (in nm) corresponding to each RCS time-series. For elastic
     channels the detection and emission wavelength are the same or slightly
     different.
 laser\_pointing\_angle\_of\_profiles
     :Type: *integer*
     :Dimensions: *time*
     :Location: Included in all the Low Resolution SCC L1 Product files
     :Definition: ``int laser_pointing_angle_of_profiles(time)``
     This variable allows to identify the zenith angle at which
     each single RCS contained in the time-series refer to. In particular,
     for a given time the variable
     *laser\_pointing\_angle\_of\_profiles(time)* provides the scan angle
     index at which all the RCS included in the file refer to at the same
     time. To get the value of the scan angle the variable
     *laser\_pointing\_angle* should be evaluated in correspondence of the
     index returned by the variable
     *laser\_pointing\_angle\_of\_profiles(time)*.
 shots
     :Type: *integer*
     :Dimensions: *time*
     :Location: Included in all the Low Resolution SCC L1 Product files
     :Definition: ``int shots(time)``
     This variable report the number of laser shots that have
     been integrated the all the RCS time-series at a given time.
 start\_time
     :Type: *integer*
     :Dimensions: *time*
     :Location: Included in all the Low Resolution SCC L1 Product files
     :Definition: ``int start_time(time)``
     Variable reporting the value of the start time of each RCS
     within all the time-series in seconds since the start of measurement.
 stop\_time
     :Type: *integer*
     :Dimensions: *time*
     :Location: Included in all the Low Resolution SCC L1 Product files
     :Definition: ``int stop_time(time)``
     Variables reporting the value of the stop time of each RCS
     within all the time-series in seconds since the start of the
     measurement.
 LR\_Input
     :Type: *integer*
     :Dimensions: N/A
     :Location: Present only if the Low Resolution SCC L1 Product corresponds
                to an elastic only product
     :Definition: ``int LR_Input``
     This variable is only used by ELDA module in the elastic
     only retrieval to know which value of particle lidar ratio assume in the
     retrieval. A value of 1 means to use a fixed value stored in the SCC
     database for each product. A value of 0 means to use a profile of lidar
     ratio provided by the user as external file.
 overlap\_correction
     :Type: *integer*
     :Dimensions: N/A
     :Location: Included in all the Low Resolution SCC L1 Product files
     :Definition: ``int overlap_correction``
     This variable provides information on the overlap
     correction of all the RCS time-series included in the file. If it is set
     to 1 the overlap correction has been applied if it is set to null value
     the overlap correction has not been applied.
 cloud\_flag
     :Type: *integer*
     :Dimensions: *time, points*
     :Location: Included in all the Low Resolution SCC L1 Product files
     :Definition: ``int cloud_flag(time, points)``
     variable reporting the cloud mask on the RCS time-series
     included in the file. A value of 1 means no cloud any other values
     different from 1 correspond to the presence of cloud.
 Atmospheric Molecular Variables
 ###############################
 Elastic\_Mol\_Extinction
     :Type: *double*
     :Dimensions: *scan\_angles, points*
     :Location: Included in all the Low Resolution SCC L1 Product files
     :Definition: *double Elastic\_Mol\_Extinction(scan\_angles, points)*
     This variable provides the value of molecular extinction
     coefficient at elastic wavelength in m\ :sup:`-1` at a given scan angle
     and altitude (points). The values are calculated from standard models or
     from radiosounding (submitted to the SCC as external input files)
 LR\_Mol
     :Type: *double*
     :Dimensions: N/A
     :Location: Included in all the Low Resolution SCC L1 Product files
     :Definition: ``double LR_Mol``
     The value of calculated molecular lidar ratio in sr.
 Emission\_Wave\_Mol\_Trasmissivity
     :Type: *double*
     :Dimensions: *scan\_angles, points*
     :Location: Included in all the Low Resolution SCC L1 Product files
     :Definition: ``double Emission_Wave_Mol_Trasmissivity(scan_angles, points)``
     This variable provides the value of molecular trasmissitivy
     at emission wavelength at a given scan angle and altitude (*points*).
 Detection\_Wave\_Mol\_Trasmissivity
     :Type: *double*
     :Dimensions: *scan\_angles, points*
     :Location: Included in all the Low Resolution SCC L1 Product files
     :Definition: ``double Detection_Wave_Mol_Trasmissivity(scan_angles, points)``
     This variable provides the value of molecular trasmissitivy
     at detection wavelength at a given scan angle and altitude (*points*).
 Aerosol Related Variables
 #########################
 elT
     :Type: *double*
     :Dimensions: *time, points*
     :Location: Present if the Low Resolution SCC L1 Product involves one
                single elastic channel not split in near and far range
     :Definition: ``double elT(time, points)``
     This variable contains the time-series of the RCS
     corresponding to an elastic channel. The RCS may correspond to a single
     physical lidar channel or to two physical channels (one optimized for
     the near range and the other for the far range) that have been glued by
     ELPP module.
 elT\_err
     :Type: *double*
     :Dimensions: *time, points*
     :Location: Present if the Low Resolution SCC L1 Product involves one
                single elastic channel not split in near and far range
     :Definition: ``double elT_err(time, points)``
     This variable describes the statistical uncertainties
     corresponding to the variable *elT*.
 elTnr
     :Variable name: *elTnr*
     :Type: *double*
     :Dimensions: *time, points*
     :Location: Present if the Low Resolution SCC L1 Product involves a near
                range elastic channel
     :Definition: ``double elTnr(time, points)``
     This variable contains the time-series of the RCS
     corresponding to a near range elastic channel. If this variable is
     present also the corresponding *elTfr* variable should be present in
     the file.
 elTnr\_err
     :Type: *double*
     :Dimensions: * time, points*
     :Location: Present if the Low Resolution SCC L1 Product involves a near
                range elastic channel
     :Definition: ``double elTnr_err(time, points)``
     This variable describes the statistical uncertainties
     corresponding to the variable *elTnr*.
 elTfr
     :Type: *double*
     :Dimensions: *time, points*
     :Location: Present if the Low Resolution SCC L1 Product involves a far
                range elastic channel
     :Definition: ``double elTfr(time, points)``
     This variable contains the time-series of the RCS
     corresponding to a far range elastic channel. If this variable is
     present also the corresponding *elTnr* variable should be present in
     the file.
 elTfr\_err
     :Type: *double*
     :Dimensions: *time, points*
     :Location: Present if the Low Resolution SCC L1 Product involves a far
                range elastic channel
     :Definition: ``double elTfr_err(time, points)``
     This variable describes the statistical uncertainties
     corresponding to the variable *elTfr*.
 vrRN2
     :Type: * double*
     :Dimensions: *time, points*
     :Location: Present if the Low Resolution SCC L1 Product involves one
                vibro-rotational N2 Raman channel not split in near and far range
     :Definition: ``double vrRN2(time, points)``
     This variable contains the time-series of the RCS
     corresponding to a vibro-rotational N2 Raman channel. The RCS may
     correspond to a single physical lidar channel or to two physical
     channels (one optimized for the near range and the other for the far
     range) that have been glued by ELPP module.
 vrRN2\_err
     :Type: *double*
     :Dimensions: *time, points*
     :Location: Present if the Low Resolution SCC L1 Product involves one
                vibro-rotational N2 Raman channel not split in near and far range
     :Definition: ``double vrRN2_err(time, points)``
     This variable describes the statistical uncertainties
     corresponding to the variable *vrRN2*.
 vrRN2nr
     :Type: *double*
     :Dimensions: *time, points*
     :Location: Present if the Low Resolution SCC L1 Product involves a near
                range vibro-rotational N2 Raman channel
     :Definition: ``double vrRN2nr(time, points)``
     This variable contains the time-series of the RCS
     corresponding to a near range vibro-rotationl N2 Raman. If this variable
     is present also the corresponding *vrRN2fr* variable should be present
     in the file.
 vrRN2nr\_err
     :Type: *double*
     :Dimensions: *time, points*
     :Location: Present if the Low Resolution SCC L1 Product involves a near
                range vibro-rotational N2 Raman channel
     :Definition: ``double vrRN2nr_err(time, points)``
     This variable describes the statistical uncertainties
     corresponding to the variable *vrRN2nr*.
 vrRN2fr
     :Type: *double*
     :Dimensions: *time, points*
     :Location: Present if the Low Resolution SCC L1 Product involves a far
                range vibro-rotational N2 Raman channel
     :Definition: ``double vrRN2fr(time, points)``
     This variable contains the time-series of the RCS
     corresponding to a far range vibro-rotationl N2 Raman. If this variable
     is present also the corresponding *vrRN2nr* variable should be present
     in the file.
 vrRN2fr\_err
     :Type: *double*
     :Dimensions: * time, points*
     :Location: Present if the Low Resolution SCC L1 Product involves a far
                range vibro-rotational N2 Raman channel
     :Definition: ``double vrRN2fr_err(time, points)``
     This variable describes the statistical uncertainties
     corresponding to the variable *vrRN2fr*.
 Polarization related variables
 ##############################
 elPT
     :Type: *double*
     :Dimensions: *time, points*
     :Location: Present if the Low Resolution SCC L1 Product involves
                polarization sensitive elastic channels not split in near and far range
     :Definition: ``double elPT(time, points)``
     This variable contains the time-series of the RCS
     corresponding to the elastic polarization component which is transmitted
     by the polarization sensitive optical subsystem. This component may
     correspond to a total, cross or parallel polarization component
     depending on the particular system configuration. Moreover the RCS may
     correspond to a single physical lidar channel or to two physical
     channels (one optimized for the near range and the other for the far
     range) that have been glued by ELPP module.
 elPT\_err
     :Type: *double*
     :Dimensions: *time, points*
     :Location: Present if the Low Resolution SCC L1 Product involves
                spolarization sensitive elastic channels not split in near and far range
     :Definition: ``double elPT_err(time, points)``
     This variable describes the statistical uncertainties
     corresponding to the variable *elPT*.
 elPTnr
     :Type: *double*
     :Dimensions: * time, points*
     :Location: Present if the Low Resolution SCC L1 Product involves near
                range polarization sensitive elastic channels
     :Definition: ``double elPTnr(time, points)``
     This variable contains the time-series of the RCS
     corresponding to the near range elastic polarization component which is
     transmitted by the polarization sensitive optical subsystem. This
     component may correspond to a total, cross or parallel polarization
     component depending on the particular system configuration. If this
     variable is present also the corresponding *elPTfr* variable should be
     present in the file.
 elPTnr\_err
     :Type: *double*
     :Dimensions: * time, points*
     :Location: Present if the Low Resolution SCC L1 Product involves near
                range polarization sensitive elastic channels
     :Definition: ``double elPTnr_err(time, points)``
     This variable describes the statistical uncertainties
     corresponding to the variable *elPTnr*.
 elPTfr
     :Type: *double*
     :Dimensions: *time, points*
     :Location: Present if the Low Resolution SCC L1 Product involves far
                range polarization sensitive elastic channels
     :Definition: ``double elTfr(time, points)``
     This variable contains the time-series of the RCS
     corresponding to the far range elastic polarization component which is
     transmitted by the polarization sensitive optical subsystem. This
     component may correspond to a total, cross or parallel polarization
     component depending on the particular system configuration. If this
     variable is present also the corresponding elPTnr variable should be
     present in the file.
 elPTfr\_err
     :Type: *double*
     :Dimensions: * time, points*
     :Location: Present if the Low Resolution SCC L1 Product involves far
                range polarization sensitive elastic channels
     :Definition: ``double elPTfr_err(time, points)``
     This variable describes the statistical uncertainties
     corresponding to the variable *elPTfr*.
 elPR
     :Type: *double*
     :Dimensions: *time, points*
     :Location: Present if the Low Resolution SCC L1 Product involves
                polarization sensitive elastic channels not split in near and far range
     :Definition: ``double elPR(time, points)``
     This variable contains the time-series of the RCS
     corresponding to the elastic polarization component which is reflected
     by the polarization sensitive optical subsystem. This component may
     correspond to a total, cross or parallel polarization component
     depending on the particular system configuration. Moreover the RCS may
     correspond to a single physical lidar channel or to two physical
     channels (one optimized for the near range and the other for the far
     range) that have been glued by ELPP module.
 elPR\_err
     :Type: *double*
     :Dimensions: * time, points*
     :Location: Present if the Low Resolution SCC L1 Product involves
                polarization sensitive elastic channels not split in near and far range
     :Definition: ``double elPR_err(time, points)``
     This variable describes the statistical uncertainties
     corresponding to the variable *elPR*.
 elPRnr
     :Type: *double*
     :Dimensions: * time, points*
     :Location: Present if the Low Resolution SCC L1 Product involves near
                range polarization sensitive elastic channels
     :Definition: ``double elPTnr(time, points)``
     This variable contains the time-series of the RCS
     corresponding to the near range elastic polarization component which is
     reflected by the polarization sensitive optical subsystem. This
     component may correspond to a total, cross or parallel polarization
     component depending on the particular system configuration. If this
     variable is present also the corresponding *elPRfr* variable should be
     present in the file.
 elPRnr\_err
     :Type: *double*
     :Dimensions: *time, points*
     :Location: Present if the Low Resolution SCC L1 Product involves near
                range polarization sensitive elastic channels
     :Definition: `` double elPRnr_err(time, points)``
     This variable describes the statistical uncertainties
     corresponding to the variable *elPRnr*.
 elPRfr
     :Type: *double*
     :Dimensions: *time, points*
     :Location: Present if the Low Resolution SCC L1 Product involves far
                range polarization sensitive elastic channels
     :Definition: ``double elPRfr(time, points)``
     This variable contains the time-series of the RCS
     corresponding to the far range elastic polarization component which is
     reflected by the polarization sensitive optical subsystem. This
     component may correspond to a total, cross or parallel polarization
     component depending on the particular system configuration. If this
     variable is present also the corresponding *elPRnr* variable should be
     present in the file.
 elPRfr\_err
     :Type: *double*
     :Dimensions: *time, points*
     :Location: Present if the Low Resolution SCC L1 Product involves far
                range polarization sensitive elastic channels
     :Definition: ``double elPRfr_err(time, points)``
     This variable describes the statistical uncertainties
     corresponding to the variable *elPRfr*.
 G\_T
     :Type: *double*
     :Dimensions: N/A
     :Location: Present if the Low Resolution SCC L1 Product involves
                polarization sensitive elastic channels
     :Definition: ``double G_T``
     G polarization cross-talk factor value corresponding to the
     polarization transmitted channel.
 G\_T\_Statistical\_Err
     :Type: *double*
     :Dimensions: N/A
     :Location: Present if the Low Resolution SCC L1 Product involves
                polarization sensitive elastic channels
     :Definition: ``double G_T_Statistical_Err``
     This variable describes the statistical uncertainties
     corresponding to the variable *G\_T*.
 G\_T\_Systematic\_Err
     :Type: *double*
     :Dimensions: N/A
     :Location: Present if the Low Resolution SCC L1 Product involves
                polarization sensitive elastic channels
     :Definition: ``double G_T_Systematic_Err``
     This variable describes the systematic uncertainties
     corresponding to the variable *G\_T*.
 H\_T
     :Type: *double*
     :Dimensions: N/A
     :Location: Present if the Low Resolution SCC L1 Product involves
                polarization sensitive elastic channels
     :Definition: ``double H_T``
     H polarization cross-talk factor value corresponding to the
     polarization transmitted channel.
 H\_T\_Statistical\_Err
     :Type: *double*
     :Dimensions: N/A
     :Location: Present if the Low Resolution SCC L1 Product involves
                polarization sensitive elastic channels
     :Definition: ``double H_T_Statistical_Err``
     This variable describes the statistical uncertainties
     corresponding to the variable *H\_T*.
 H\_T\_Systematic\_Err
     :Type: *double*
     :Dimensions: N/A
     :Location: Present if the Low Resolution SCC L1 Product involves
                polarization sensitive elastic channels
     :Definition: ``double H_T_Systematic_Err``
     This variable describes the systematic uncertainties
     corresponding to the variable *H\_T*.
 G\_R
     :Type: *double*
     :Dimensions: N/A
     :Location: Present if the Low Resolution SCC L1 Product involves
                polarization sensitive elastic channels
     :Definition: ``double G_R``
     G polarization cross-talk factor value corresponding to the
     polarization reflected channel.
 G\_R\_Statistical\_Err
     :Type: *double*
     :Dimensions: N/A
     :Location: Present if the Low Resolution SCC L1 Product involves
                polarization sensitive elastic channels
     :Definition: ``double G_R_Statistical_Err``
     This variable describes the statistical uncertainties
     corresponding to the variable *G\_R*.
 G\_R\_Systematic\_Err
     :Type: *double*
     :Dimensions: N/A
     :Location: Present if the Low Resolution SCC L1 Product involves
                polarization sensitive elastic channels
     :Definition: `` double G_R_Systematic_Err``
     This variable describes the systematic uncertainties
     corresponding to the variable *G\_R*.
 H\_R
     :Type: *double*
     :Dimensions: N/A
     :Location: Present if the Low Resolution SCC L1 Product involves
                polarization sensitive elastic channels
     :Definition: ``double H_R``
     H polarization cross-talk factor value corresponding to the
     polarization reflected channel.
 H\_R\_Statistical\_Err
     :Type: *double*
     :Dimensions: N/A
     :Location: Present if the Low Resolution SCC L1 Product involves
                polarization sensitive elastic channels
     :Definition: ``double H_R_Statistical_Err``
     This variable describes the statistical uncertainties
     corresponding to the variable *H\_R*.
 H\_R\_Systematic\_Err
     :Type: *double*
     :Dimensions: N/A
     :Location: Present if the Low Resolution SCC L1 Product involves
                polarization sensitive elastic channels
     :Definition: ``double H_R_Systematic_Err``
     This variable describes the systematic uncertainties
     corresponding to the variable *H\_R*.
 Polarization\_Channel\_Gain\_Factor
     :Type: *double*
     :Dimensions: N/A
     :Location: Present if the Low Resolution SCC L1 Product involves
                polarization sensitive elastic channels
     :Definition: ``double Polarization_Channel_Gain_Factor``
     This variable reports the value of the gain ratio of the
     reflected and transmitted polarization channels.
 Polarization\_Channel\_Gain\_Factor\_Statistical\_Err
     :Type: *double*
     :Dimensions: N/A
     :Location: Present if the Low Resolution SCC L1 Product involves
                polarization sensitive elastic channels
     :Definition: ``double Polarization_Channel_Gain_Factor_Statistical_Err``
     This variable describes the statistical uncertainties
     corresponding to the variable *Polarization\_Channel\_Gain\_Factor*.
 Polarization\_Channel\_Gain\_Factor\_Systematic\_Err
     :Type: *double*
     :Dimensions: N/A
     :Location: Present if the Low Resolution SCC L1 Product involves
                polarization sensitive elastic channels
     :Definition: ``double Polarization_Channel_Gain_Factor_Systematic_Err``
     This variable describes the systematic uncertainties
     corresponding to the variable *Polarization\_Channel\_Gain\_Factor*.
 Polarization\_Channel\_Gain\_Factor\_Correction
     :Type: *double*
     :Dimensions: N/A
     :Location: Present if the Low Resolution SCC L1 Product involves
                polarization sensitive elastic channels
     :Definition: ``double Polarization_Channel_Gain_Factor_Correction``
     This variable reports the value of the correction to the
     gain ratio of the reflected and transmitted polarization channels.
 Polarization\_Channel\_Gain\_Factor\_Correction\_Statistical\_Err
     :Type: *double*
     :Dimensions: N/A
     :Location: Present if the Low Resolution SCC L1 Product involves
                polarization sensitive elastic channels
     :Definition: ``double Polarization_Channel_Gain_Factor_Correction_Statistical_Err``
     This variable describes the statistical uncertainties
     corresponding to the variable
 Polarization\_Channel\_Gain\_Factor\_Correction
 Polarization\_Channel\_Gain\_Factor\_Correction\_Systematic\_Err
     :Type: *double*
     :Dimensions: N/A
     :Location: Present if the Low Resolution SCC L1 Product involves
                polarization sensitive elastic channels
     :Definition: ``double Polarization_Channel_Gain_Factor_Correction_Systematic_Err``
     This variable describes the systematic uncertainties
     corresponding to the variable *Polarization\_Channel\_Gain\_Factor\_Correction*.
 G\_T\_Near\_Range
     :Type: *double*
     :Dimensions: N/A
     :Location: Present if the Low Resolution SCC L1 Product involves near
                range polarization sensitive elastic channels
     :Definition: ``double G_T_Near_Range``
     G polarization cross-talk factor value corresponding to the
     near range polarization transmitted channel.
 G\_T\_Near\_Range\_Statistical\_Err
     :Type: *double*
     :Dimensions: N/A
     :Location: Present if the Low Resolution SCC L1 Product involves near
                range polarization sensitive elastic channels
     :Definition: ``double G_T_Near_Range_Statistical_Err``
     This variable describes the statistical uncertainties
     corresponding to the variable *G\_T\_Near\_Range*.
 G\_T\_Near\_Range\_Systematic\_Err
     :Type: *double*
     :Dimensions: N/A
     :Location: Present if the Low Resolution SCC L1 Product involves near
                range polarization sensitive elastic channels
     :Definition: ``double G_T_Near_Range_Systematic_Err``
     This variable describes the systematic uncertainties
     corresponding to the variable *G\_T\_Near\_Range*.
 H\_T\_Near\_Range
     :Type: *double*
     :Dimensions: N/A
     :Location: Present if the Low Resolution SCC L1 Product involves near
                range polarization sensitive elastic channels
     :Definition: ``double H_T_Near_Range``
     H polarization cross-talk factor value corresponding to the
     near range polarization transmitted channel.
 H\_T\_Near\_Range\_Statistical\_Err
     :Type: *double*
     :Dimensions: N/A
     :Location: Present if the Low Resolution SCC L1 Product involves near
                range polarization sensitive elastic channels
     :Definition: ``double H_T_Near_Range_Statistical_Err``
     This variable describes the statistical uncertainties
     corresponding to the variable *H\_T\_Near\_Range*.
 H\_T\_Near\_Range\_Systematic\_Err
     :Type: *double*
     :Dimensions: N/A
     :Location: Present if the Low Resolution SCC L1 Product involves near
                range polarization sensitive elastic channels
     :Definition: ``double H_T_Near_Range_Systematic_Err``
     This variable describes the systematic uncertainties
     corresponding to the variable *H\_T\_Near\_Range*.
 G\_R\_Near\_Range
     :Type: *double*
     :Dimensions: N/A
     :Location: Present if the Low Resolution SCC L1 Product involves near
                range polarization sensitive elastic channels
     :Definition: ``double G_R_Near_Range``
     G polarization cross-talk factor value corresponding to the
     near range polarization reflected channel.
 G\_R\_Near\_Range\_Statistical\_Err
     :Type: *double*
     :Dimensions: N/A
     :Location: Present if the Low Resolution SCC L1 Product involves near
                range polarization sensitive elastic channels
     :Definition: ``double G_R_Near_Range_Statistical_Err``
     This variable describes the statistical uncertainties
     corresponding to the variable *G\_R\_Near\_Range*.
 G\_R\_Near\_Range\_Systematic\_Err
     :Type: *double*
     :Dimensions: N/A
     :Location: Present if the Low Resolution SCC L1 Product involves near
                range polarization sensitive elastic channels
     :Definition: ``double G_R_Near_Range_Systematic_Err``
     This variable describes the systematic uncertainties
     corresponding to the variable *G\_R\_Near\_Range*.
 H\_R\_Near\_Range
     :Type: *double*
     :Dimensions: N/A
     :Location: Present if the Low Resolution SCC L1 Product involves near
                range polarization sensitive elastic channels
     :Definition: ``double H_R_Near_Range``
     H polarization cross-talk factor value corresponding to the
     near range polarization reflected channel.
 H\_R\_Near\_Range\_Statistical\_Err
     :Type: *double*
     :Dimensions: N/A
     :Location: Present if the Low Resolution SCC L1 Product involves near
                range polarization sensitive elastic channels
     :Definition: ``double H_R_Near_Range_Statistical_Err``
     This variable describes the statistical uncertainties
     corresponding to the variable *H\_R\_Near\_Range*.
 H\_R\_Near\_Range\_Systematic\_Err
     :Type: *double*
     :Dimensions: N/A
     :Location: Present if the Low Resolution SCC L1 Product involves near
                range polarization sensitive elastic channels
     :Definition: ``double H_R_Near_Range_Systematic_Err``
     This variable describes the systematic uncertainties
     corresponding to the variable *H\_R\_Near\_Range*.
 Polarization\_Channel\_Gain\_Factor\_Near\_Range
     :Type: *double*
     :Dimensions: N/A
     :Location: Present if the Low Resolution SCC L1 Product involves near
                range polarization sensitive elastic channels
     :Definition: ``double Polarization_Channel_Gain_Factor_Near_Range``
     This variable reports the value of the gain ratio of the
     near range reflected and transmitted polarization channels.
 Polarization\_Channel\_Gain\_Factor\_Near\_Range\_Statistical\_Err
     :Type: *double*
     :Dimensions: N/A
     :Location: Present if the Low Resolution SCC L1 Product involves near
                range polarization sensitive elastic channels
     :Definition: ``double Polarization_Channel_Gain_Factor_Near_Range_Statistical_Err``
     This variable describes the statistical uncertainties
     corresponding to the variable *Polarization\_Channel\_Gain\_Near\_Range\_Factor*.
 Polarization\_Channel\_Gain\_Factor\_Near\_Range\_Systematic\_Err
     :Type: *double*
     :Dimensions: N/A
     :Location: Present if the Low Resolution SCC L1 Product involves near
                range polarization sensitive elastic channels
     :Definition: ``double Polarization_Channel_Gain_Factor_Near_Range_Systematic_Err``
     This variable describes the systematic uncertainties
     corresponding to the variable *Polarization\_Channel\_Gain\_Factor\_Near\_Range*.
 Polarization\_Channel\_Gain\_Factor\_Correction\_Near\_Range
     :Type: *double*
     :Dimensions: N/A
     :Location: Present if the Low Resolution SCC L1 Product involves near
                range polarization sensitive elastic channels
     :Definition: ``double Polarization_Channel_Gain_Factor_Correction_Near_Range``
     This variable reports the value of the correction to the
     near range gain ratio of the reflected and transmitted polarization
     channels.
 Polarization\_Channel\_Gain\_Factor\_Correction\_Near\_Range\_Statistical\_Err
     :Type: *double*
     :Dimensions: N/A
     :Location: Present if the Low Resolution SCC L1 Product involves near
                range polarization sensitive elastic channels
     :Definition: ``double Polarization_Channel_Gain_Factor_Correction_Near_Range_Statistical_Err``
     This variable describes the statistical uncertainties
     corresponding to the variable Polarization\_Channel\_Gain\_Factor\_Correction\_Near\_Range
 Polarization\_Channel\_Gain\_Factor\_Correction\_Near\_Range\_Systematic\_Err
     :Type: *double*
     :Dimensions: N/A
     :Location: Present if the Low Resolution SCC L1 Product involves near
                range polarization sensitive elastic channels
     :Definition: ``double Polarization_Channel_Gain_Factor_Correction_Near_Range_Systematic_Err``
     This variable describes the systematic uncertainties
     corresponding to the variable *Polarization\_Channel\_Gain\_Factor\_Correction\_Near\_Range*.
 G\_T\_Far\_Range
     :Type: *double*
     :Dimensions: N/A
     :Location: Present if the Low Resolution SCC L1 Product involves far
                range polarization sensitive elastic channels
     :Definition: ``double G_T_Far_Range``
     G polarization cross-talk factor value corresponding to the
     far range polarization transmitted channel.
 G\_T\_Far\_Range\_Statistical\_Err
     :Type: *double*
     :Dimensions: N/A
     :Location: Present if the Low Resolution SCC L1 Product involves far
                range polarization sensitive elastic channels
     :Definition: ``double G_T_Far_Range_Statistical_Err``
     This variable describes the statistical uncertainties
     corresponding to the variable *G\_T\_Far\_Range*.
 G\_T\_Far\_Range\_Systematic\_Err
     :Type: *double*
     :Dimensions: N/A
     :Location: Present if the Low Resolution SCC L1 Product involves far
                range polarization sensitive elastic channels
     :Definition: ``double G_T_Far_Range_Systematic_Err``
     This variable describes the systematic uncertainties
     corresponding to the variable *G\_T\_Far\_Range*.
 H\_T\_Far\_Range
     :Type: *double*
     :Dimensions: N/A
     :Location: Present if the Low Resolution SCC L1 Product involves far
                range polarization sensitive elastic channels
     :Definition: ``double H_T_Far_Range``
     H polarization cross-talk factor value corresponding to the
     far range polarization transmitted channel.
 H\_T\_Far\_Range\_Statistical\_Err
     :Type: *double*
     :Dimensions: N/A
     :Location: Present if the Low Resolution SCC L1 Product involves far
                range polarization sensitive elastic channels
     :Definition: ``double H_T_Far_Range_Statistical_Err``
     This variable describes the statistical uncertainties
     corresponding to the variable *H\_T\_Far\_Range*.
 H\_T\_Far\_Range\_Systematic\_Err
     :Type: *double*
     :Dimensions: N/A
     :Location: Present if the Low Resolution SCC L1 Product involves far
                range polarization sensitive elastic channels
     :Definition: ``double H_T_Far_Range_Systematic_Err``
     This variable describes the systematic uncertainties
     corresponding to the variable *H\_T\_Far\_Range*.
 G\_R\_Far\_Range
     :Type: *double*
     :Dimensions: N/A
     :Location: Present if the Low Resolution SCC L1 Product involves far
                range polarization sensitive elastic channels
     :Definition: ``double G_R_Far_Range``
     G polarization cross-talk factor value corresponding to the
     far range polarization reflected channel.
 G\_R\_Far\_Range\_Statistical\_Err
     :Type: *double*
     :Dimensions: N/A
     :Location: Present if the Low Resolution SCC L1 Product involves far
                range polarization sensitive elastic channels
     :Definition: ``double G_R_Far_Range_Statistical_Err``
     This variable describes the statistical uncertainties
     corresponding to the variable *G\_R\_Far\_Range*.
 G\_R\_Far\_Range\_Systematic\_Err
     :Type: *double*
     :Dimensions: N/A
     :Location: Present if the Low Resolution SCC L1 Product involves far
                range polarization sensitive elastic channels
     :Definition: ``double G_R_Far_Range_Systematic_Err``
     This variable describes the systematic uncertainties
     corresponding to the variable *G\_R\_Far\_Range*.
 H\_R\_Far\_Range
     :Type: *double*
     :Dimensions: N/A
     :Location: Present if the Low Resolution SCC L1 Product involves far
                range polarization sensitive elastic channels
     :Definition: ``double H_R_Far_Range``
     H polarization cross-talk factor value corresponding to the
     far range polarization reflected channel.
 H\_R\_Far\_Range\_Statistical\_Err
     :Type: *double*
     :Dimensions: N/A
     :Location: Present if the Low Resolution SCC L1 Product involves far
                range polarization sensitive elastic channels
     :Definition: ``double H_R_Far_Range_Statistical_Err``
     This variable describes the statistical uncertainties
     corresponding to the variable *H\_R\_Far\_Range*.
 H\_R\_Far\_Range\_Systematic\_Err
     :Type: *double*
     :Dimensions: N/A
     :Location: Present if the Low Resolution SCC L1 Product involves far
                range polarization sensitive elastic channels
     :Definition: ``double H_R_Far_Range_Systematic_Err``
     This variable describes the systematic uncertainties
     corresponding to the variable *H\_R\_Far\_Range*.
 Polarization\_Channel\_Gain\_Factor\_Far\_Range
     :Type: *double*
     :Dimensions: N/A
     :Location: Present if the Low Resolution SCC L1 Product involves far
                range polarization sensitive elastic channels
     :Definition: ``double Polarization_Channel_Gain_Factor_Far_Range``
     This variable reports the value of the gain ratio of the
     far range reflected and transmitted polarization channels.
 Polarization\_Channel\_Gain\_Factor\_Far\_Range\_Statistical\_Err
     :Type: *double*
     :Dimensions: N/A
     :Location: Present if the Low Resolution SCC L1 Product involves far
                range polarization sensitive elastic channels
     :Definition: ``double Polarization_Channel_Gain_Factor_Far_Range_Statistical_Err``
     This variable describes the statistical uncertainties
     corresponding to the variable
     *Polarization\_Channel\_Gain\_Far\_Range\_Factor*.
 Polarization\_Channel\_Gain\_Factor\_Far\_Range\_Systematic\_Err
     :Type: *double*
     :Dimensions: N/A
     :Location: Present if the Low Resolution SCC L1 Product involves far
                range polarization sensitive elastic channels
     :Definition: ``double Polarization_Channel_Gain_Factor_Far_Range_Systematic_Err``
     This variable describes the systematic uncertainties
     corresponding to the variable *Polarization\_Channel\_Gain\_Factor\_Far\_Range*.
 Polarization\_Channel\_Gain\_Factor\_Correction\_Far\_Range
     :Type: *double*
     :Dimensions: N/A
     :Location: Present if the Low Resolution SCC L1 Product involves far
                range polarization sensitive elastic channels
     :Definition: ``double Polarization_Channel_Gain_Factor_Correction_Far_Range``
     This variable reports the value of the correction to the
     far range gain ratio of the reflected and transmitted polarization
     channels.
 Polarization\_Channel\_Gain\_Factor\_Correction\_Far\_Range\_Statistical\_Err
     :Type: *double*
     :Dimensions: N/A
     :Location: Present if the Low Resolution SCC L1 Product involves far
                range polarization sensitive elastic channels
     :Definition: ``double Polarization_Channel_Gain_Factor_Correction_Far_Range_Statistical_Err``
     This variable describes the statistical uncertainties
     corresponding to the variable *Polarization\_Channel\_Gain\_Factor\_Correction\_Far\_Range*.
 Polarization\_Channel\_Gain\_Factor\_Correction\_Far\_Range\_Systematic\_Err
     :Type: *double*
     :Dimensions: N/A
     :Location: Present if the Low Resolution SCC L1 Product involves far
                range polarization sensitive elastic channels
     :Definition: ``double Polarization_Channel_Gain_Factor_Correction_Far_Range_Systematic_Err``
     This variable describes the systematic uncertainties
     corresponding to the variable
     *Polarization\_Channel\_Gain\_Factor\_Correction\_Far\_Range*.
 Depolarization\_Calibration\_Type
     :Type: *integer*
     :Dimensions: N/A
     :Location: Present if the Low Resolution SCC L1 Product involves
                polarization sensitive elastic channels
     :Definition: ``int Depolarization_Calibration_Type``
     This variable describes the type of depolarization
     calibration that has been performed. A value of 1 means automatic
     calibration made the the SCC, a value of 2 means manual calibration
     inserted into the SCC database.
 Molecular\_Linear\_Depolarization\_Ratio
     :Type: *double*
     :Dimensions: *scan\_angles,points*
     :Location: Present if the Low Resolution SCC L1 Product involves
                polarization sensitive elastic channels
     :Definition: ``double Molecular_Linear_Depolarization_Ratio(scan_angles, points)``
     This variable report the value of molecular linear
     depolarization ration for at given scan angles and at given altitude
     (*points*). This profile is calculated on the base of the atmospheric
     data from standard models or radiosonding submitted by the user as
     separate file.
 The altitude scale at which each RCS within the time-series reported by
 the variables *elT, elTnr, elTfr, vrRN2, vrRN2nr, vrRN2fr, elPT, elPTnr,
 elPTfr, elPR, elPRnr, elPRfr*, refer to can be obtained as::
     H(laser_pointing_angle_of_profiles(time),points)
 The total signal (:math:`I_{total}`) and the volume depolarization
 ratio (:math:`\delta`) can be calculated out of reflected (:math:`I_{R}`) and
 transmitted (:math:`I_{T}`) polarization component intensities using
 the following equations:
 .. math::
    \delta^{*} = \frac{K}{\eta^{*}}\frac{I_R}{I_T}
 .. math::
    \delta = \frac{\delta^{*} (G_T + H_T) - (G_R + H_R)}{(G_R - H_R) - \delta_{*}(G_T - H_T)}
 .. math::
    I_{total} \propto \frac{\eta^{*}}{K} H_R I_T - H_T I_R
 where :math:`\eta^{*}` is the gain ratio of the reflected and transmitted
 polarization channels (variable *Polarization\_Channel\_Gain\_Factor*);
 :math:`K` is the correction to the gain ratio of the reflected and transmitted
 polarization channels (variable *Polarization\_Channel\_Gain\_Factor\_Correction*);
 :math:`I_{R}` is the intensity of the reflected polarization component (variable *elPR*);
 :math:`I_{T}` is the intensity of the transmitted polarization
 component (variable *elPT*); and :math:`G_{T}`, :math:`H_{T}`,
 :math:`G_{R}`, and :math:`H_{R}` are the polarization cross-talk
 parameters (variables *G\_T*, *H\_T*, *G\_R*, and *H\_R*).
 Low Resolution SCC L1 Product Format: global attributes
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 In this section all the possible Low Resolution SCC L1 Product global
 attributes are reported. There are some global attributes that are
 mandatory and have to be present in all the Low Resolution SCC L1
 Product files while there are others that have to be present only in
 specific cases.
 Location
     :Type: *string*
     :Location: Included in all the Low Resolution SCC L1 Product files
     The name of site where the measurements have been performed
 System
     :Type: *string*
     :Location: Included in all the Low Resolution SCC L1 Product files
     The name of the lidar system used to perform the
     measurements
 Latitude\_degrees\_north
     :Type: *double*
     :Location: Included in all the Low Resolution SCC L1 Product files
     The latitude (in degrees North) of the measurement site
 Longitude\_degrees\_east
     :Type: *double*
     :Location: Included in all the Low Resolution SCC L1 Product files
     The longitude (in degrees East) of the measurement site
 Altitude\_meter\_asl
     :Type: *double*
     :Location: Included in all the Low Resolution SCC L1 Product files
     The altitude (in m above see level) of the measurement site
 Measurement\_ID
     :Type: *string*
     :Location: Included in all the Low Resolution SCC L1 Product files
     Within the SCC all the measurement sessions is identified
     by a string called *Measurement\_ID* uniquely. This gobal attributes
     provides this string.
 Measurement\_Start\_Date
     :Type: *string*
     :Location: Included in all the Low Resolution SCC L1 Product files
     The start date of the measurements. The format in which
     this date is written is specified in the gobal attribute
     *Measurement\_Date\_Format*.
 Measurement\_Date\_Format
     :Type: *string*
     :Location: Included in all the Low Resolution SCC L1 Product files
     The format in which the global attribute
     *Measurement\_Start\_Date* is given.
 Measurement\_Start\_Time\_UT
     :Type: *string*
     :Location: Included in all the Low Resolution SCC L1 Product files
     The start time (UT) of the measurements. The format in
     which this time is written is specified in the global attribute
     *Measurement\_Time\_Format*.
 Measurement\_Time\_Format
     :Type: *string*
     :Location: Included in all the Low Resolution SCC L1 Product files
     The format in which the global attribute
     *Measurement\_Start\_Time\_U*\ T is given.
 Comments
     :Type: *string*
     :Location: Included in all the Low Resolution SCC L1 Product files
     This string can contain comments of the measurement session
 Overlap\_File\_Name
     :Type: *string*
     :Location: Included in all the Low Resolution SCC L1 Product files for
                which an overlap file has been submitted by the data originator.
     The name of the overlap file to use for overlap correction.
 LR\_File\_Name
     :Type: *string*
     :Location: Included in all the Low Resolution SCC L1 Product files
                corresponding to elastic only retrieval and for which an lidar ratio
                profile file has been submitted by the data originator.
     The name of the lidar ratio file containing the profile of
     particle lidar ratio values to use as input in the elastic only
     retrieval.
 SCCPreprocessingVersion
     :Type: *string*
     :Location: Included in all the Low Resolution SCC L1 Product files
     The version of SCC used to produce the current Low
     Resolution SCC L1 Product
 Low Resolution SCC L1 Product Filename
 --------------------------------------
 The filename of the Low Resolution SCC L1 Products has the following
 format::
     measurementid_prodid.nc
 The *measurementid* is a 12 characters alphanumeric string identifying
 the measurement session at which the product refers to. The
 *measurementid* (which is unique for a given measurement session) allows
 to fully trance the SCC analysis performed on the current product. This
 can be done because each measurement session is recorded in a SCC
 database using the same string. In the same database the measurement
 session is linked to the lidar configuration used to analyze the data
 (which is recorded and fully characterized in the SCC database providing
 all the channel details) and to a set of optical products to calculate.
 The *prodid* is a numeric string identifying the optical product that
 has to be calculated by SCC (in particular ELDA module) by applying the
 optical retrieval algorithm on the current pre-processed L1 product.
 Different product types are defined within the SCC. The contents of a
 Low Resolution SCC L1 product depends on the type of the product
 specified in the its filename by prodid string. In particular only the
 **Aerosol Related Variables **\ and\ ** Polarization related variables**
 specified in the section 2.2 can change depending on product type. In
 Tab. 3.1 are reported the product-type related variables for each
 optical product type.
 To link the *prodid* string with the corresponding product type the SCC
 database a proper query to the SCC database should be addressed.
 **Table 3.1:** Possible variables that can be found in the SCC L1
 Products for each optical product type
 +--------------------------------------------------------------+---------------------------------------------------+
 | Product type                                                 | Possible variables in Low Resolution L1 Product   |
 +--------------------------------------------------------------+---------------------------------------------------+
 | Extinction only                                              | vrRN2, vrRN2nr, vrRN2fr                           |
 |                                                              |                                                   |
 |                                                              | vrRN2\_err, vrRN2nr\_err, vrRN2fr\_err            |
 +--------------------------------------------------------------+---------------------------------------------------+
 | Elastic Backscatter                                          | elT, elTnr, elTfr                                 |
 |                                                              |                                                   |
 | Elastic Backscatter + Particle Linear Depolarization Ratio   | elT\_err, elTnr\_err, elTfr\_err                  |
 |                                                              |                                                   |
 |                                                              | elPR, elPRnr, elPRfr                              |
 |                                                              |                                                   |
 |                                                              | elPR\_err, elPRnr\_err, elPRfr\_err               |
 |                                                              |                                                   |
 |                                                              | elPT, elPTnr, elPTfr                              |
 |                                                              |                                                   |
 |                                                              | elPT\_err, elPTnr\_err, elPTfr\_err               |
 +--------------------------------------------------------------+---------------------------------------------------+
 | Raman Backscatter                                            | elT, elTnr, elTfr                                 |
 |                                                              |                                                   |
 | Raman Backscatter + Particle Linear Depolarization Ratio     | elT\_err, elTnr\_err, elTfr\_err                  |
 |                                                              |                                                   |
 | Lidar Ratio                                                  | elPR, elPRnr, elPRfr                              |
 |                                                              |                                                   |
 |                                                              | elPR\_err, elPRnr\_err, elPRfr\_err               |
 |                                                              |                                                   |
 |                                                              | elPT, elPTnr, elPTfr                              |
 |                                                              |                                                   |
 |                                                              | elPT\_err, elPTnr\_err, elPTfr\_err               |
 |                                                              |                                                   |
 |                                                              | vrRN2, vrRN2nr, vrRN2fr                           |
 |                                                              |                                                   |
 |                                                              | vrRN2\_err, vrRN2nr\_err, vrRN2fr\_err            |
 +--------------------------------------------------------------+---------------------------------------------------+

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docs/file_formats/low_resolution.rst@73345b4f532f (annotated)

docs/file_formats/low_resolution.rst