Attributes {
    HDF5_GLOBAL {
        String ShortName "TRPSDL2CH4CRSFS";
        String LongName "TROPESS CrIS-SNPP L2 Methane for Forward Stream, Standard Product";
        Int32 VersionID 1;
        String IdentifierProductDOIAuthority "https://doi.org/";
        String IdentifierProductDOI "10.5067/MRTPR45H95EC";
        String Format "NetCDF-4";
        String ProductionDateTime "2021-05-24T00:38:36Z";
        String RangeBeginningDate "2021-02-28";
        String RangeBeginningTime "00:00:00.0";
        String RangeEndingDate "2021-02-28";
        String RangeEndingTime "23:59:59.0";
        String ProcessingLevel "2";
        String GranuleID "TROPESS_CrIS-SNPP_L2_Standard_CH4_20210228_MUSES_R1p11_FS_F0p1.nc";
        Float64 SouthBoundingCoordinate -67.000000000000000;
        Float64 NorthBoundingCoordinate 85.000000000000000;
        Float64 WestBoundingCoordinate -180.00000000000000;
        Float64 EastBoundingCoordinate 180.00000000000000;
        String source "MUSES v1.11";
        String history "20210524T003836Z: original file created at TROPESS SIPS";
        String Conventions "CF-1.8";
        String MeasuredParameter "CH4";
        String Platform "SUOMI-NPP";
        String Instrument "CrIS";
    }
    observation_ops {
        String comment "observation operators";
        String fullnamepath "/observation_ops";
    }
    geophysical {
        String comment "geophysical attributes";
        String fullnamepath "/geophysical";
    }
    geolocation {
        String comment "CrIS geolocation information";
        String fullnamepath "/geolocation";
    }
    observation_ops_averaging_kernel {
        Float32 _FillValue -999.0000000;
        String long_name "logarithmic_averaging_kernel";
        String comment "Sensitivity of the retrieved state ln(VMR) to the true state ln(VMR).";
        String units "1";
        Float32 missing_value -999.0000000;
        String source "MUSES:Lite:AveragingKernel";
        String origname "averaging_kernel";
        String fullnamepath "/observation_ops/averaging_kernel";
        String coordinates "observation_ops_longitude observation_ops_latitude";
    }
    observation_ops_observation_error {
        Float32 _FillValue -999.0000000;
        String long_name "logarithmic_observation_error";
        String comment "Measurement + systematic + cross-state error of ln(VMR). Use for comparisons with other measurements and for assimilation.";
        String units "1";
        Float32 missing_value -999.0000000;
        String source "MUSES:Lite:ObservationErrorCovariance";
        String origname "observation_error";
        String fullnamepath "/observation_ops/observation_error";
        String coordinates "observation_ops_longitude observation_ops_latitude";
    }
    observation_ops_xa {
        Float32 _FillValue -999.0000000;
        String long_name "apriori_state";
        String comment "A priori state, as volume mixing ratio (VMR) relative to dry air";
        String units "1";
        Float32 missing_value -999.0000000;
        String source "MUSES:Lite:ConstraintVector";
        String origname "xa";
        String fullnamepath "/observation_ops/xa";
        String coordinates "observation_ops_longitude observation_ops_latitude";
    }
    observation_ops_signal_dof {
        Float32 _FillValue -999.0000000;
        String long_name "degrees_of_freedom_for_signal";
        String comment "Degrees of freedom for signal";
        String units "1";
        Float32 missing_value -999.0000000;
        String source "MUSES:Lite:DOFs";
        String origname "signal_dof";
        String fullnamepath "/observation_ops/signal_dof";
    }
    observation_ops_x_test {
        Float32 _FillValue -999.0000000;
        String long_name "test_state";
        String comment "The estimated state for target 0 based on x[0], xa[0], and avg_kernel[0], as volume mixing ratio (VMR) relative to dry air";
        String units "1";
        Float32 missing_value -999.0000000;
        String source "Derived:Python: x_test = np.exp(np.log(xa[0]) + averaging_kernel[0] @ (np.log(x[0]) - np.log(xa[0])))";
        String origname "x_test";
        String fullnamepath "/observation_ops/x_test";
    }
    time {
        Float64 _FillValue -999.00000000000000;
        String long_name "time_tai93";
        String standard_name "time";
        String comment "earth view target midtime as International Atomic Time (TAI) seconds since 1993-01-01 00:00:00";
        String units "seconds since 1993-01-01 00:00:00";
        Float64 missing_value -999.00000000000000;
        String source "MUSES:Lite:Time";
        String origname "time";
        String fullnamepath "/time";
    }
    longitude {
        Float32 _FillValue -999.0000000;
        String long_name "longitude";
        String standard_name "longitude";
        String comment "longitude of earth view target center";
        String units "degrees_east";
        Float32 valid_range -180.0000000, 180.0000000;
        Float32 missing_value -999.0000000;
        String source "MUSES:Lite:Longitude";
        String origname "longitude";
        String fullnamepath "/longitude";
    }
    latitude {
        Float32 _FillValue -999.0000000;
        String long_name "latitude";
        String standard_name "latitude";
        String comment "latitude of earth view target center";
        String units "degrees_north";
        Float32 valid_range -90.00000000, 90.00000000;
        Float32 missing_value -999.0000000;
        String source "MUSES:Lite:Latitude";
        String origname "latitude";
        String fullnamepath "/latitude";
    }
    altitude {
        Float32 _FillValue -999.0000000;
        String long_name "altitude";
        String standard_name "altitude";
        String comment "Altitude at each target.";
        String units "m";
        String coordinates "longitude latitude";
        Float32 missing_value -999.0000000;
        String source "MUSES:Lite:Altitude";
        String origname "altitude";
        String fullnamepath "/altitude";
    }
    geophysical_day_night_flag {
        Int32 _FillValue -999;
        String long_name "day_night_flag";
        String standard_name "day_binary_mask";
        String comment "If target is during the day == 1, otherwise == 0";
        String flag_meanings "night day";
        Int32 missing_value -999;
        String source "MUSES:Lite:DayNightFlag";
        String origname "day_night_flag";
        String fullnamepath "/geophysical/day_night_flag";
    }
    geophysical_surface_temperature {
        Float32 _FillValue -999.0000000;
        String long_name "surface_temperature";
        String standard_name "surface_temperature";
        String comment "Surface temperature";
        String units "K";
        Float32 missing_value -999.0000000;
        String source "MUSES:Lite:Retrieval/SurfaceTemperature";
        String origname "surface_temperature";
        String fullnamepath "/geophysical/surface_temperature";
    }
    geophysical_average_cloud_eod {
        Float32 _FillValue -999.0000000;
        String long_name "average_cloud_effective_optical_depth";
        String comment "Average cloud effective optical depth";
        String units "1";
        Float32 missing_value -999.0000000;
        String source "MUSES:Lite:Retrieval/AverageCloudEffOpticalDepth";
        String origname "average_cloud_eod";
        String fullnamepath "/geophysical/average_cloud_eod";
    }
    geophysical_land_flag {
        Int32 _FillValue -999;
        String long_name "land_flag";
        String standard_name "land_binary_mask";
        String comment "If target is over land == 1, otherwise == 0";
        String flag_meanings "water land";
        Int32 missing_value -999;
        String source "MUSES:Lite:LandFlag";
        String origname "land_flag";
        String fullnamepath "/geophysical/land_flag";
    }
    geophysical_cloud_top_pressure {
        Float32 _FillValue -999.0000000;
        String long_name "cloud_top_pressure";
        String standard_name "air_pressure_at_cloud_top";
        String comment "Pressure of inferred cloud top";
        String units "hPa";
        Float32 missing_value -999.0000000;
        String source "MUSES:Lite:Retrieval/CloudTopPressure";
        String origname "cloud_top_pressure";
        String fullnamepath "/geophysical/cloud_top_pressure";
    }
    datetime_utc {
        Int32 _FillValue -999;
        String long_name "datetime_utc";
        String comment "UTC expressed as an array of integers year, month, day, hour, minute, second";
        String units "1";
        Int32 missing_value -999;
        String source "MUSES:Lite:UT_Hour";
        String origname "datetime_utc";
        String fullnamepath "/datetime_utc";
    }
    pressure {
        Float32 _FillValue -999.0000000;
        String long_name "pressure";
        String standard_name "air_pressure";
        String comment "Atmospheric pressure used for retrieval at each target.";
        String units "hPa";
        String coordinates "longitude latitude";
        Float32 missing_value -999.0000000;
        String source "MUSES:Lite:Pressure";
        String origname "pressure";
        String fullnamepath "/pressure";
    }
    geolocation_cris_granule {
        Int32 _FillValue -999;
        String long_name "cris_granule";
        String comment "CrIS granule number";
        String units "1";
        Int32 missing_value -999;
        String source "MUSES:Lite:Geolocation/CrIS_Granule";
        String origname "cris_granule";
        String fullnamepath "/geolocation/cris_granule";
    }
    geolocation_cris_atrack {
        Int32 _FillValue -999;
        String long_name "cris_along_track";
        String comment "CrIS along-track index";
        String units "1";
        Int32 missing_value -999;
        String source "MUSES:Lite:Geolocation/CrIS_Atrack_Index";
        String origname "cris_atrack";
        String fullnamepath "/geolocation/cris_atrack";
    }
    geolocation_cris_xtrack {
        Int32 _FillValue -999;
        String long_name "cris_cross_track";
        String comment "CrIS cross-track index";
        String units "1";
        Int32 missing_value -999;
        String source "MUSES:Lite:Geolocation/CrIS_Xtrack_Index";
        String origname "cris_xtrack";
        String fullnamepath "/geolocation/cris_xtrack";
    }
    geolocation_cris_fov {
        Int32 _FillValue -999;
        String long_name "cris_field_of_view";
        String comment "CrIS field-of-view index";
        String units "1";
        Int32 missing_value -999;
        String source "MUSES:Lite:Geolocation/CrIS_Pixel_Index";
        String origname "cris_fov";
        String fullnamepath "/geolocation/cris_fov";
    }
    geolocation_cris_view_ang {
        Float32 _FillValue -999.0000000;
        String long_name "cris_view_angle";
        String standard_name "sensor_view_angle";
        String comment "CrIS view angle";
        String units "degree";
        Float32 valid_range 0.000000000, 90.00000000;
        Float32 missing_value -999.0000000;
        String source "MUSES:Lite:Geolocation/PointingAngle_CrIS";
        String origname "cris_view_ang";
        String fullnamepath "/geolocation/cris_view_ang";
    }
    x {
        Float32 _FillValue -999.0000000;
        String long_name "dry_atmosphere_mole_fraction_of_methane";
        String comment "Volume mixing ratio (VMR) of Methane relative to dry air";
        String source "MUSES:Lite:Species";
        String standard_name "dry_atmosphere_mole_fraction_of_methane";
        String units "1";
        String coordinates "longitude latitude";
        Float32 missing_value -999.0000000;
        String origname "x";
        String fullnamepath "/x";
    }
    year_fraction {
        Float64 _FillValue -999.00000000000000;
        String long_name "year_fraction";
        String comment "Year plus fraction of the year";
        String units "year";
        Float64 missing_value -999.00000000000000;
        String source "MUSES:Lite:YearFloat";
        String origname "year_fraction";
        String fullnamepath "/year_fraction";
    }
}