HDF5 file, superblock version 2
group /
	attribute abs_orbit_number = 47508
	attribute abs_orbit_start = 47508
	attribute abs_orbit_stop = 47508
	attribute acquisition_station = "Kiruna              "
	attribute ascending_flag = "D"
	attribute close_sea_percent = 0
	attribute continent_ice_percent = 0
	attribute creation_time = "UTC=2020-04-07T05:07:15"
	attribute cycle_number = 12
	attribute delta_ut1 = 0.0
	attribute doi = "10.5270/CR2-gsyvnx0"
	attribute equator_cross_long = 105690987
	attribute equator_cross_time = "UTC=2019-03-26T04:39:32.744319"
	attribute first_record_lat = 23982568
	attribute first_record_lon = -84179957
	attribute first_record_time = "TAI=2019-03-26T05:23:09.132987"
	attribute instr_id = "A"
	attribute l1b_proc_flag = "0"
	attribute l1b_proc_thresh = 500
	attribute l1b_processing_quality = 10000
	attribute l1b_prod_status = "0"
	attribute l2_proc_flag = "0"
	attribute l2_proc_thresh = 500
	attribute l2_processing_quality = 10000
	attribute l2_prod_status = "0"
	attribute land_percent = 968
	attribute last_record_lat = 18988089
	attribute last_record_lon = -84727880
	attribute last_record_time = "TAI=2019-03-26T05:24:31.431550"
	attribute leap_err = "0"
	attribute leap_sign = 0
	attribute leap_utc = "                           "
	attribute lrm_mode_percent = 0
	attribute mission = "Cryosat"
	attribute open_ocean_percent = 9032
	attribute phase = "2"
	attribute processing_centre = "PDS"
	attribute processing_stage = "LTA_"
	attribute product_err = "0"
	attribute product_name = "CS_LTA__SIR_SINI2__20190326T052232_20190326T052355_D002"
	attribute reference_document = "CS-RS-ACS-ESL-5265 1.6"
	attribute rel_orbit_number = 1025
	attribute rel_time_acs_node_start = 2579.417236328125
	attribute rel_time_acs_node_stop = 2661.7158203125
	attribute sar_mode_percent = 0
	attribute sarin_mode_percent = 10000
	attribute sensing_start = "26-MAR-2019 05:22:32.132987"
	attribute sensing_stop = "26-MAR-2019 05:23:54.431550"
	attribute sir_configuration = "BOTH   "
	attribute sir_op_mode = "SARIN     "
	attribute software_version = "IPF2SRN/5.3"
	attribute state_vector_time = "UTC=2019-03-26T05:23:13.282268"
	attribute vector_source = "doris_precise"
	attribute x_position = 638857.75
	attribute x_velocity = -499.00885009765625
	attribute xref_cal1 = "CS_OFFL_SIR_SIC11B_20181231T115924_20190429T115924_D101.DBL"
	attribute xref_cal1_sarin = "CS_OFFL_SIR_SICC1B_20190326T115924_20190326T115924_C101.DBL"
	attribute xref_cal2 = "CS_OFFL_SIR1SIC21B_20190401T115924_20190401T115924_D101.DBL,CS_OFFL_SIR2SIC21B_20190401T115924_20190401T115924_D101.DBL"
	attribute xref_constants = "Geophysical_Constants_5.0.xml"
	attribute xref_dem = "CS_OPER_AUX_DEMMSL_00000000T000000_99999999T999999_0007.DBL"
	attribute xref_dip_map = "CS_OPER_AUX_DIPMAP_00000000T000000_99999999T999999_0002.DBL"
	attribute xref_earth_tide = "CS_OPER_AUX_CARTWR_00000000T000000_99999999T999999_0002.DBL"
	attribute xref_geoid = "CS_OPER_AUX_GEOID__00000000T000000_99999999T999999_0002.DBL"
	attribute xref_gim = "CS_OPER_AUX_IONGIM_20190326T000000_20190326T235959_0001.DBL"
	attribute xref_iono_cor = "CS_OPER_AUX_MICOEF_00000000T000000_99999999T999999_0002.DBL"
	attribute xref_mean_pressure = "CS_OPER_AUX_SEAMPS_20190326T000000_20190326T000000_0001.DBL,CS_OPER_AUX_SEAMPS_20190326T060000_20190326T060000_0001.DBL"
	attribute xref_meteo = "CS_OPER_AUX_ALTGRD_20110504T100000_20301231T235959_0003.DBL"
	attribute xref_mog2d = "CS_OPER_AUX_MOG_2D_20190326T000000_20190326T000000_0001.DBL,CS_OPER_AUX_MOG_2D_20190326T060000_20190326T060000_0001.DBL"
	attribute xref_mss = "CS_OPER_AUX_MSSURF_00000000T000000_99999999T999999_0007.DBL"
	attribute xref_ocean_tide = "CS_OPER_AUX_OCTIDE_00000000T000000_99999999T999999_0003.DBL"
	attribute xref_odle = "CS_OPER_AUX_ODLE___00000000T000000_99999999T999999_0002.DBL"
	attribute xref_orbit = "CS_OPER_AUX_ORBDOR_20190325T215523_20190327T002323_F001.EEF,CS_OPER_MPL_ORBPRE_20190326T001000_20190425T001000_0001.EEF"
	attribute xref_orbit_scenario = "CS_OPER_MPL_ORBREF_20180707T231257_20190711T045744_0001.EEF"
	attribute xref_pconf = "CS_OPER_PCONF_IPF1_20161001T000000_99999999T000000_0001.XML,CS_OPER_PCONF_IPF2_20150427T000000_99999999T999999_0010.XML"
	attribute xref_pole_location = "CS_OPER_AUX_POLLOC_19870101T000000_20200401T000000_0001.DBL"
	attribute xref_s1_tide_amplitude = "CS_OPER_AUX_S1AMPL_00000000T000000_99999999T999999_0001.DBL"
	attribute xref_s1_tide_phase = "CS_OPER_AUX_S1PHAS_00000000T000000_99999999T999999_0001.DBL"
	attribute xref_s1s2_pressure_00h = "CS_OPER_AUX_PRSS00_00000000T000000_99999999T999999_0001.DBL"
	attribute xref_s1s2_pressure_06h = "CS_OPER_AUX_PRSS06_00000000T000000_99999999T999999_0001.DBL"
	attribute xref_s1s2_pressure_12h = "CS_OPER_AUX_PRSS12_00000000T000000_99999999T999999_0001.DBL"
	attribute xref_s1s2_pressure_18h = "CS_OPER_AUX_PRSS18_00000000T000000_99999999T999999_0001.DBL"
	attribute xref_s2_tide_amplitude = "CS_OPER_AUX_S2AMPL_00000000T000000_99999999T999999_0001.DBL"
	attribute xref_s2_tide_phase = "CS_OPER_AUX_S2PHAS_00000000T000000_99999999T999999_0001.DBL"
	attribute xref_sai = "CS_OPER_AUX_SUNACT_19910101T000000_20200401T000000_0001.DBL"
	attribute xref_sea_ice = "CS_OPER_AUX_SEA_IC_20190324T000000_20190326T235959_0003.DBL"
	attribute xref_siral_characterisation = "CS_OPER_AUX_IPFDBA_20100701T000000_99999999T999999_0001.EEF"
	attribute xref_siral_l0 = "CS_OPER_SIR1SIN_0__20190326T052232_20190326T052355_0001.DBL,CS_OPER_SIR1TKSI0__20190326T052232_20190326T052355_0001.DBL,CS_OPER_SIR2SIN_0__20190326T052232_20190326T052355_0001.DBL"
	attribute xref_siral_l1b = "CS_LTA__SIR_SIN_1B_20190326T052232_20190326T052355_D002.DBL"
	attribute xref_snow_depth = "CS_OPER_AUX_SDC_03_00000000T000000_99999999T999999_0005.DBL"
	attribute xref_star_tracker_attref = "CS_OFFL_STR_ATTREF_20190325T215523_20190327T002321_D001.EEF"
	attribute xref_surf_pressure = "CS_OPER_AUX_SURFPS_20190326T000000_20190326T000000_0001.DBL,CS_OPER_AUX_SURFPS_20190326T060000_20190326T060000_0001.DBL"
	attribute xref_surf_type = "CS_OPER_AUX_LS_MAP_00000000T000000_99999999T999999_0002.DBL"
	attribute xref_tidal_load = "CS_OPER_AUX_TDLOAD_00000000T000000_99999999T999999_0003.DBL"
	attribute xref_u_wind = "CS_OPER_AUX_U_WIND_20190326T000000_20190326T000000_0001.DBL,CS_OPER_AUX_U_WIND_20190326T060000_20190326T060000_0001.DBL"
	attribute xref_uso = "CS_OPER_AUX_DORUSO_20100411T040029_20190527T062937_0001.DBL"
	attribute xref_v_wind = "CS_OPER_AUX_V_WIND_20190326T000000_20190326T000000_0001.DBL,CS_OPER_AUX_V_WIND_20190326T060000_20190326T060000_0001.DBL"
	attribute xref_wet_trop = "CS_OPER_AUX_WETTRP_20190326T000000_20190326T000000_0001.DBL,CS_OPER_AUX_WETTRP_20190326T060000_20190326T060000_0001.DBL"
	attribute y_position = -6581103.0
	attribute y_velocity = -2796.81201171875
	attribute z_position = 2587001.25
	attribute z_velocity = -6969.810546875
dataset /across_track_angle_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "The across track angle between the nadir vector and the vector from the satellite to the point of closest approach computed from the phase measurement in SARIn mode. Unused in LRM and SAR modes. "
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute long_name = "across track angle"
	attribute scale_factor = 1e-06
	attribute units = "rad"
dataset /across_track_angle_cor_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "The applied to the across track angle between the nadir vector and the vector from the satellite to the point of closest approach computed from the phase measurement in SARIn mode. Unused in LRM and SAR modes."
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute long_name = "across track angle correction"
	attribute scale_factor = 1e-06
	attribute units = "rad"
dataset /alt_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "Altitude of satellite CoM above reference ellipsoid (WGS84)."
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute long_name = "altitude of CoM satellite above reference ellipsoid"
	attribute scale_factor = 0.001
	attribute standard_name = "height_above_reference_ellipsoid"
	attribute units = "m"
dataset /beam_dir_vec_20_ku: int32, shape (1844, 3)
	attribute _FillValue = -2147483648
	attribute comment = "Real beam direction vector described in the CryoSat Reference Frame. The 3 components are given according to the [space_3d] dimension: [1] x, [2] y, [3] z."
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute long_name = "real beam direction vector in crf"
	attribute scale_factor = 1e-06
	attribute units = "m"
dataset /coherence_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "The coherence of the SARIn echoes at the retracking point. This is sampled from the coherence waveforms in the L1b product. The coherence waveform is a fully-calibrated, high resolution, multilooked coherence computed from the complex echoes on the two receiving channels. Unused in LRM and SAR modes."
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute long_name = "coherence"
	attribute scale_factor = 0.001
dataset /dem_height_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "Height value extracted from DEM used for SARIn ambiguity check. Unused in LRM and SAR modes. See Bamber, Jonathan L., Jose Luis Gomez-Dans, and Jennifer A. Griggs. 2009. Antarctic 1 km Digital Elevation Model (DEM) from Combined ERS-1 Radar and ICESat Laser Satellite Altimetry. Boulder, Colorado USA: National Snow and Ice Data Center and Howat I.M., A. Negrete and B.E. Smith, 2014, The Greenland Ice Mapping Project (GIMP) land classification and surface elevation datasets, The Cryosphere, 8, 1509-1518, doi:10.5194/tc-8-1509-2014."
	attribute coordinates = "lon_poca_20_ku lat_poca_20_ku"
	attribute institution = "UCL"
	attribute long_name = "height of DEM"
	attribute scale_factor = 0.001
	attribute source = "Bamber and GIMP"
	attribute units = "m"
dataset /dem_identifier_20_ku: int8, shape (1844)
	attribute _FillValue = -128
	attribute comment = "ID of the DEM interpolated to supply the value present in [dem_height_20_ku]. Unused in LRM and SAR modes."
	attribute coordinates = "lon_poca_20_ku lat_poca_20_ku"
	attribute long_name = "ID of DEM"
dataset /dop_angle_start_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute add_offset = 0.0
	attribute comment = "Value of Doppler Angle for the first single look echo in the stack. It is the angle between: perpendicular to the velocity vector and the direction satellite - surface location. The Doppler angle depends on velocity vector and on geometry."
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute long_name = "doppler angle start"
	attribute scale_factor = 1e-07
	attribute units = "rad"
dataset /dop_angle_stop_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute add_offset = 0.0
	attribute comment = "Value of Doppler Angle for the last single look echo in the stack. It is the angle between: perpendicular to the velocity vector and the direction satellite - surface location. The Doppler angle depends on velocity vector and on geometry."
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute long_name = "doppler angle stop"
	attribute scale_factor = 1e-07
	attribute units = "rad"
dataset /dop_cor_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute add_offset = 0
	attribute comment = "This is the Doppler range correction due to the satellite altitude rate. It is computed for the component of satellite velocity in the nadir direction. Correction applied to the window delay during the L1 processing, therefore height estimates at L2 include this correction."
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute long_name = "doppler range correction"
	attribute scale_factor = 0.001
	attribute units = "m"
dataset /echo_numval_20_ku: int16, shape (1844)
	attribute _FillValue = -32768
	attribute comment = "For LRM is the number of echoes averaged to compute the corresponding L1B 20Hz power waveform. For SAR/SARIn is the number of single look echoes in the Surface Sample Stack that have been multilooked to compute the corresponding L1B 20Hz power waveform. This variable includes only one receiving channel however, in SARIn, single looks from both channels are averaged in order to reduce the SNR."
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute long_name = "count of echoes or beams averaged"
	attribute units = "count"
dataset /flag_cor_err_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "Correction error flag. This flag shows, for correction algorithms that have been called only (see [flag_cor_status_20_ku]), whether the correction algorithms returned an error."
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute flag_masks = 1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096, 8192, 16384, 32768, ... (21 values)
	attribute flag_meanings = "surface_type_error pole_tide_error solid_earth_error load_tide_error ocean_tide_equil_error ocean_tide_error iono_model_error iono_gim_error hf_fluctuations_error inv_bar_error model_wet_error model_dry_error ssb_model_error slope_model_error dem_error odle_error geoid_error mss_error snow_density_error snow_depth_error ice_conc_error"
	attribute long_name = "corrections error flags"
dataset /flag_cor_status_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "Correction status flag. This flag shows which correction algorithms have been called. This is used to determine which auxiliary datasets should be listed as reference datasets."
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute flag_masks = 1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096, 8192, 16384, 32768, ... (21 values)
	attribute flag_meanings = "surface_type_called pole_tide_called solid_earth_called load_tide_called ocean_tide_equil_called ocean_tide_called iono_model_called iono_gim_called hf_fluctuations_called inv_bar_called model_wet_called model_dry_called ssb_model_called slope_model_called dem_called odle_called geoid_called mss_called snow_density_called snow_depth_called ice_conc_called"
	attribute long_name = "corrections status flags"
dataset /flag_disc_stat_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "Discriminator status flags. These flags are raised to provide low-level detail on why individual waveforms were rejected for processing. Unused in LRM mode."
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute flag_masks = 1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096, 8192, 16384, 32768, ... (17 values)
	attribute flag_meanings = "multiple_match no_match sar_wf_too_wide sar_snr_low sar_unreliable_ice_conc sar_unavailable_ice_conc sar_bad_bb sar_low_power sar_low_pk sar_high_pk sin_high_pk sin_low_power sin_low_pk sin_high_noise sin_bad_le sin_low_var discrimination_fail"
	attribute long_name = "discrimination status flag"
dataset /flag_freeboard_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "SAR freeboard status flags indicate availability and reliability of the freeboard measurement. The measurement is unavailable if any step in the processing fails. The measurement is unreliable if extrapolation has to be used to determine the sea-surface height anomaly. Unused in LRM mode."
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute flag_masks = 1, 2, 4, 8
	attribute flag_meanings = "in_south in_north unreliable unavailable"
	attribute long_name = "freeboard flag"
dataset /flag_height_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "Height status flags show which corrections have been applied to the height fields [height_1_20_ku] [height_2_20_ku] [height_3_20_ku]. Flags which are mode dependent incorporate the name of the mode to which they apply."
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute flag_masks = 1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096, 8192, 16384, 32768, ... (30 values)
	attribute flag_meanings = "correction_failure ssb_applied sarin_bad_velocity sarin_out_of_range sarin_bad_baseline lrm_slope_model_applied sarin_ice_bias_applied sarin_ocean_bias_applied sar_ice_bias_applied sar_ocean_bias_applied lrm_ice_bias_applied lrm_ocean_bias_applied lrm_retracker_applied sarin_retracker_applied sar_retracker_applied window_offset_applied slope_doppler_applied pole_tide_applied solid_earth_applied load_tide_applied ocean_tide_equil_applied ocean_tide_applied iono_model_applied iono_gim_applied hf_fluctuations_applied inv_bar_applied model_wet_applied model_dry_applied doppler_applied internal_cal_applied"
	attribute long_name = "height status flag"
dataset /flag_instr_conf_rx_bwdt_20_ku: int8, shape (1844)
	attribute _FillValue = -128
	attribute comment = "This flag contains the instrument acquisition band of the SIRAL instrument."
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute flag_meanings = "Unknown 320_MHz 40_MHz"
	attribute flag_values = 0, 1, 2
	attribute long_name = "instrument acquisition band"
dataset /flag_instr_conf_rx_flags_20_ku: int8, shape (1844)
	attribute comment = "This flag contains the status of the SIRAL instrument acquisition."
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute flag_masks = -128, 64, 32, 16, 8, 4, 2, 1
	attribute flag_meanings = "siral_redundant external_cal open_loop loss_of_echo real_time_error echo_saturation rx_band_attenuated cycle_report_error"
	attribute long_name = "instrument configuration flag"
dataset /flag_instr_conf_rx_in_use_20_ku: int8, shape (1844)
	attribute _FillValue = -128
	attribute comment = "This flag contains the instrument receive channel in use in the SIRAL instrument."
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute flag_meanings = "unknown Rx1 Rx2 Both"
	attribute flag_values = 0, 1, 2, 3
	attribute long_name = "instrument receive channel"
dataset /flag_instr_conf_rx_str_in_use_20_ku: int8, shape (1844)
	attribute _FillValue = -128
	attribute comment = "Star tracker identification flag showing the source of the platform pointing. 0: No Star Tracker data used. 1: Data from Star Tracker 1 used. 2: Data from Star Tracker 2 used. 3: Data from Star Tracker 3 used. 4: Data from the Star Tracker selected on board by AOCS used."
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute flag_meanings = "no_star_tracker tracker_1 tracker_2 tracker_3 attref_file"
	attribute flag_values = 0, 1, 2, 3, 4
	attribute long_name = "star tracker id"
dataset /flag_instr_conf_rx_trk_mode_20_ku: int8, shape (1844)
	attribute _FillValue = -128
	attribute comment = "This flag indicates the tracking mode of the SIRAL instrument."
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute flag_meanings = "Unknown LRM SAR SARIN"
	attribute flag_values = 0, 1, 2, 3
	attribute long_name = "Instrument configuration flag"
dataset /flag_instr_mode_att_ctrl_20_ku: int8, shape (1844)
	attribute _FillValue = -128
	attribute comment = "Platform attitude control mode from instrument configuration bits in L0."
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute flag_meanings = "unknown local_normal_pointing yaw_steering"
	attribute flag_values = 0, 1, 2
	attribute long_name = "platform attitude control mode"
dataset /flag_instr_mode_flags_20_ku: int8, shape (1844)
	attribute _FillValue = -128
	attribute comment = "Flags related to sub-modes of SARIn mode from instrument configuration bits in L0."
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute flag_masks = 2, 1
	attribute flag_meanings = "SARIN_degraded_case CAL4_packet_detection"
	attribute long_name = "SARIn sub-mode flags "
dataset /flag_instr_mode_op_20_ku: int8, shape (1844)
	attribute _FillValue = -128
	attribute comment = "Instrument measurement mode derived from configuration bits in L0."
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute flag_meanings = "lrm sar sarin"
	attribute flag_values = 1, 2, 3
	attribute long_name = "measurement mode"
dataset /flag_mcd_20_ku: int32, shape (1844)
	attribute _FillValue = -1
	attribute comment = "Measurement confidence flags. Generally the MCD flags indicate problems when set. If the whole MCD is 0 then no problems or non-nominal conditions were detected. Serious errors are indicated by setting the most-significant bit i.e. block_degraded, in which case the block must not be processed. Other error settings can be regarded as warnings."
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute flag_masks = -2147483648, 1073741824, 536870912, 268435456, 134217728, 67108864, 33554432, 16777216, 8388608, 4194304, 2097152, 1048576, 524288, 262144, 131072, 65536, ... (27 values)
	attribute flag_meanings = "block_degraded blank_block datation_degraded orbit_prop_error orbit_file_change orbit_gap echo_saturated other_echo_error sarin_rx1_error sarin_rx2_error window_delay_error agc_error cal1_missing cal1_default doris_uso_missing ccal1_default trk_echo_error echo_rx1_error echo_rx2_error npm_error azimuth_cal_missing phase_pert_cor_missing cal2_missing cal2_default power_scale_error attitude_cor_missing phase_pert_cor_default"
	attribute long_name = "measurement confidence flags"
dataset /flag_quality_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "Indicates whether any of the measured values are in error."
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute flag_masks = 1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096
	attribute flag_meanings = "swh_error alt_wind_error maths_error coherence_error xtrack_angle_error echo_shape_error peakiness_error sig0_3_error sig0_2_error sig0_1_error height_3_error height_2_error height_1_error"
	attribute long_name = "quality flag"
dataset /flag_retracker_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "Retracker flags indicate errors from the retracker algorithms, and waveform quality checking results, in each mode. Mode specific flags incorporate the name of the mode."
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute flag_masks = 1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096, 8192, 16384, 32768, ... (18 values)
	attribute flag_meanings = "retracker_3_fail retracker_2_fail retracker_1_fail poor_phase_fit poor_power_fit fdm_ocog_fail fit_failed sarin_low_coherence sarin_interp_fail abnormal_bb_param out_of_range bad_leading_edge low_variance high_noise high_peakiness low_peakiness low_power sea_ice_retracker_fail"
	attribute long_name = "retracker flag"
dataset /flag_sarin_ambiguity_warning_20_ku: int8, shape (1844)
	attribute _FillValue = -128
	attribute comment = "Flag indicating if the height measurement may be affected by positional ambiguity due to phase wrapping. Used in SARIn, Unused in LRM and SAR modes."
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute flag_meanings = "no_warning warning not_checked"
	attribute flag_values = 0, 1, 2
	attribute long_name = "ambiguity warning flag"
dataset /flag_ssha_interp_20_ku: int8, shape (1844)
	attribute _FillValue = -128
	attribute comment = "Flag indicating if an error occurred during interpolation, due to a lack of values to interpolate. SSHA and freeboard results will be unreliable. Unused in LRM mode."
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute flag_masks = 1, 2, 3
	attribute flag_meanings = "no_values extrapolation unreliable"
	attribute long_name = "SSHA interpolation error flag"
dataset /flag_surf_type_class_20_ku: int16, shape (1844)
	attribute _FillValue = -32768
	attribute comment = "Flag indicating the surface type determined by analysis of the waveform and aux values. Unused in LRM mode. Over ocean in SARIn mode, the SAR discriminator for sea ice is used."
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute flag_mask = 1, 2, 4, 8, 16, 32, 64, 128, 256
	attribute flag_meanings = "lrm_undefined lrm_ocean lrm_land_ice sarin_undefined sarin_valid sar_undefined sar_ocean sar_sea_ice sar_lead"
	attribute long_name = "discriminated surface type"
dataset /freeboard_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "Sea-ice freeboard. Computed as [freeboard_20_ku] = [height_1_20_ku] - [ssha_interp_20_ku]. No correction has been made for snow depth [snow_depth_20_ku] or density [snow_density_20_ku], although estimates are provided for the convenience of the product user. Note that Freeboard can be a small negative value due to the effect of random noise (in both the height estimation and the interpolation of the sea surface) on small freeboard values. Unused in LRM mode."
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute long_name = "sea-ice freeboard"
	attribute scale_factor = 0.001
	attribute standard_name = "sea_ice_freeboard"
	attribute units = "m"
dataset /geoid_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "Computed from the geoid model with a correction to refer the value to the mean tide system i.e. includes the permanent tide (zero frequency),and referenced to WGS84. See Lemoine, F. G., S. C. Kenyon, J. K. Factor, R.G. Trimmer, N. K. Pavlis, D. S. Chinn, C. M. Cox, S. M. Klosko, S. B. Luthcke, M. H. Torrence, Y. M. Wang, R. G. Williamson, E. C. Pavlis, R. H. Rapp and T. R. Olson (1998). The Development of the Joint NASA GSFC and the National Imagery and Mapping Agency (NIMA) Geopotential Model EGM96. NASA/TP-1998-206861, July 1998."
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute institution = "NASA GSFC and NIMA"
	attribute long_name = "geoid height"
	attribute scale_factor = 0.001
	attribute source = "EGM96"
	attribute standard_name = "geoid_height_above_reference_ellipsoid"
	attribute units = "m"
dataset /height_1_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "Measured height of the surface above the reference ellipsoid (WGS84) at the coordinate location [lon_poca_20_ku] [lat_poca_20_ku]. All instrumental [instr_cor_range_rx_20_ku] and appropriate geophysical corrections included (see [flag_height_20_ku] for the set of corrections applied), and system bias. Corrected for surface slope via a slope model in LRM and SARIn degraded mode. Corrected for surface slope via phase information in SARIn mode. Contains the Ocean CFI retracker result in LRM mode, the UCL sea-ice retracker results in SAR mode (different method for specular and diffuse echoes), and the UCL margins retracker in SARIn mode."
	attribute coordinates = "lon_poca_20_ku lat_poca_20_ku"
	attribute long_name = "surface height (retracker 1)"
	attribute scale_factor = 0.001
	attribute standard_name = "height_above_reference_ellipsoid"
	attribute units = "m"
dataset /height_2_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "Measured height of the surface above the reference ellipsoid (WGS84) at the coordinate location [lon_poca_20_ku] [lat_poca_20_ku]. All instrumental [instr_cor_range_rx_20_ku] and appropriate geophysical corrections included (see [flag_height_20_ku] for the set of corrections applied), and system bias. Corrected for surface slope via a slope model in LRM. Not currently used in SAR and SARIn modes. Contains the UCL land-ice retracker in LRM mode."
	attribute coordinates = "lon_poca_20_ku lat_poca_20_ku"
	attribute long_name = "surface height (retracker 2)"
	attribute scale_factor = 0.001
	attribute standard_name = "height_above_reference_ellipsoid"
	attribute units = "m"
dataset /height_3_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "Measured height of the surface above the reference ellipsoid (WGS84) at the coordinate location [lon_poca_20_ku] [lat_poca_20_ku]. All instrumental [instr_cor_range_rx_20_ku] and appropriate geophysical corrections included (see [flag_height_20_ku] for the set of corrections applied), and system bias. Corrected for surface slope via a slope model in LRM. Not currently used in SAR and SARIn modes. Contains the OCOG retracker in LRM mode."
	attribute coordinates = "lon_poca_20_ku lat_poca_20_ku"
	attribute long_name = "surface height (retracker 3)"
	attribute scale_factor = 0.001
	attribute standard_name = "height_above_reference_ellipsoid"
	attribute units = "m"
dataset /height_sea_ice_floe_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "Measured height of the surface above the reference ellipsoid (WGS84) at the coordinate location [lon_poca_20_ku] [lat_poca_20_ku]. All instrumental [instr_cor_range_rx_20_ku] and appropriate geophysical corrections included (see [flag_cor_applied_20_ku] for the set of corrections applied), and system bias. Only filled if the sea ice floe retracker ran. This retracker is run over all surfaces not discriminated as a sea-ice lead, not just over sea-ice floes."
	attribute coordinates = "lon_poca_20_ku lat_poca_20_ku"
	attribute long_name = "surface height (sea-ice floe retracker)"
	attribute scale_factor = 0.001
	attribute standard_name = "height_above_reference_ellipsoid"
	attribute units = "m"
dataset /height_sea_ice_lead_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "Measured height of the surface above the reference ellipsoid (WGS84) at the coordinate location [lon_poca_20_ku] [lat_poca_20_ku]. All instrumental [instr_cor_range_rx_20_ku] and appropriate geophysical corrections included (see [flag_cor_applied_20_ku] for the set of corrections applied), and system bias. Only filled if the sea ice lead retracker ran."
	attribute coordinates = "lon_poca_20_ku lat_poca_20_ku"
	attribute long_name = "surface height (sea-ice floe retracker)"
	attribute scale_factor = 0.001
	attribute standard_name = "height_above_reference_ellipsoid"
	attribute units = "m"
dataset /hf_fluct_total_cor_01: int32, shape (93)
	attribute _FillValue = -2147483648
	attribute comment = "High frequency fluctuations of the sea surface topography due to high frequency air pressure and wind effects. Also known as DAC (Dynamical Atmospheric Correction). This 1-way correction is computed at the altimeter [time_cor_01] time-tag from the interpolation of 2 meteorological fields that surround the altimeter time-tag. The inverse barometric correction [inv_bar_cor_01] is included in this field. This correction has been accounted for during the computation of height (see [flag_cor_applied_20_ku] to determine if it was applied) in order to account for both the depression of the ocean surface caused by the local barometric pressure and the high-frequency effects caused by wind forcing. This correction is an alternative to [inv_bar_cor_01] and therefore only one should be used. Position is lat_20_ku and lon_20_ku accessed through the ind_first_meas_20hz_01 index."
	attribute institution = "LEGOS/CLS/CNES"
	attribute long_name = "dynamic atmosphere correction"
	attribute scale_factor = 0.001
	attribute source = "MOG2D 2.1.0"
	attribute standard_name = "sea_surface_height_correction_due_to_air_pressure_and_wind_at_high_frequency"
	attribute units = "m"
dataset /ind_first_meas_20hz_01: int32, shape (93)
	attribute _FillValue = -2147483648
	attribute comment = "Index of the first 20Hz measurement of the 1Hz packet."
	attribute long_name = "index of the first 20Hz measurement: 1 Hz"
	attribute units = "count"
dataset /ind_meas_1hz_20_ku: int16, shape (1844)
	attribute _FillValue = -32768
	attribute comment = "Index of the 1Hz measurement to which belongs the 20Hz measurement."
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute long_name = "index of the 1Hz measurement: 20 Hz ku band"
	attribute units = "count"
dataset /instr_cor_gain_rx_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute add_offset = 0.0
	attribute comment = "Instrument Gain Correction (Rx only chain). It includes the power variation from CAL1 and the AGC calibration values. "
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute long_name = "instrument gain correction (rx only chain)"
	attribute scale_factor = 0.01
	attribute units = "dB"
dataset /instr_cor_gain_tx_rx_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute add_offset = 0.0
	attribute comment = "Instrument Gain Correction (Tx-Rx chain). It includes the power variation from CAL1 and the AGC calibration values."
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute long_name = "instrument gain correction (tx-rx chain)"
	attribute scale_factor = 0.01
	attribute units = "dB"
dataset /instr_cor_range_rx_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute add_offset = 0.0
	attribute comment = "2-way Instrument Range Correction (Rx only chain). It includes: the internal path delay from CAL1, the external group delay from ground characterisation, and the vertical component of CoOM - Antenna distance."
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute long_name = "instrument range correction (rx only chain)"
	attribute scale_factor = 0.001
	attribute units = "m"
dataset /instr_cor_range_tx_rx_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute add_offset = 0.0
	attribute comment = "Instrument Range Correction (Tx-Rx chain). Calibration correction to range on channel 1 applied at L1B. It includes the internal path delay from CAL1, the external group delay from ground characterisation and the CoM - Antenna distance."
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute long_name = "instrument range correction (tx-rx chain)"
	attribute scale_factor = 0.001
	attribute units = "m"
dataset /instr_ext_ph_cor_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute add_offset = 0.0
	attribute comment = "External phase correction taken from the IPFDB file (SARIn only) to be added to the internal phase correction term. The external phase correction is the temperature-averaged component of external inter-channel phase difference derived from phase difference sensitive antenna subsystem, waveguides and instrument waveguide switches. The external phase correction doesn't contain internal instrument effects of calibration coupler and duplexer which are included in the internal phase difference correction."
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute long_name = "external phase correction taken from the ipfdb file"
	attribute scale_factor = 1e-06
	attribute units = "rad"
dataset /instr_int_ph_cor_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute add_offset = 0.0
	attribute comment = "Internal phase correction computed from the CAL-4 packets during the azimuth impulse response amplitude (SARIn only). It is set from the latest available CAL-4 packet."
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute long_name = "internal phase correction computed from the cal-4"
	attribute scale_factor = 1e-06
	attribute units = "rad"
dataset /inter_base_vec_20_ku: int32, shape (1844, 3)
	attribute _FillValue = -2147483648
	attribute comment = "Interferometer baseline direction vector.  This is the direction vector from Tx-Rx antenna reference point to Rx only antenna reference point described in the CryoSat Reference Frame. The 3 components are given according to the [space_3d] dimension: [1] x, [2] y, [3] z."
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute long_name = "interferometer baseline direction vector in crf"
	attribute scale_factor = 1e-06
	attribute units = "m"
dataset /inv_bar_cor_01: int32, shape (93)
	attribute _FillValue = -2147483648
	attribute comment = "Inverse barometric correction. This 1-way correction is computed at the altimeter [time_cor_01] time-tag from the interpolation of 2 meteorological fields that surround the altimeter time-tag. This correction has been accounted for during the computation of height (see [flag_height_20_ku] to determine if it was applied) in order to correct this range measurement for the depression of the ocean surface caused by the local barometric pressure. This correction is an alternative to [hf_fluct_total_cor_01] and only one should be used. Position is lat_20_ku and lon_20_ku accessed through the ind_first_meas_20hz_01 index."
	attribute institution = "ECMWF"
	attribute long_name = "inverse barometric correction"
	attribute scale_factor = 0.001
	attribute source = "European Centre for Medium Range Weather Forecasting"
	attribute standard_name = "sea_surface_height_correction_due_to_air_pressure_at_low_frequency"
	attribute units = "m"
dataset /iono_cor_01: int32, shape (93)
	attribute _FillValue = -2147483648
	attribute comment = "Model Ionospheric correction. This 1-way correction has been accounted for during the computation of height (see [flag_height_20_ku] to determine if it was applied) in order to correct this range measurement for ionospheric range delays of the radar pulse. This correction is an alternative to [iono_cor_gim_01] and only one should be used. See S. K. Llewellyn, R. B. Bent, A. S. C. I. H. B. FL, U. S. N. T. I. Service, Space and Missile Systems Organization (U.S.), Documentation and Description of the Bent Ionospheric Model. U.S. Department of Commerce, National Technical Information Service, 1973. Position is lat_20_ku and lon_20_ku accessed through the ind_first_meas_20hz_01 index."
	attribute institution = "Bent"
	attribute long_name = "model ionospheric correction"
	attribute scale_factor = 0.001
	attribute source = "Bent"
	attribute standard_name = "altimeter_range_correction_due_to_ionosphere"
	attribute units = "m"
dataset /iono_cor_gim_01: int32, shape (93)
	attribute _FillValue = -2147483648
	attribute comment = "GIM Ionospheric correction. This 1-way correction has been accounted for during the computation of height (see [flag_height_20_ku] to determine if it was applied) in order to correct this range measurement for ionospheric range delays of the radar pulse. This correction is an alternative to [iono_cor_01] and only one should be used. Position is lat_20_ku and lon_20_ku accessed through the ind_first_meas_20hz_01 index."
	attribute institution = "NASA/JPL"
	attribute long_name = "GIM ionospheric correction"
	attribute scale_factor = 0.001
	attribute source = "GIM"
	attribute standard_name = "altimeter_range_correction_due_to_ionosphere"
	attribute units = "m"
dataset /lat_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "Latitude of nadir location [-90,+90]. Positive latitude is North latitude, negative latitude is South latitude. Note the scale factor."
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute long_name = "20 Hz latitude"
	attribute scale_factor = 1e-07
	attribute standard_name = "latitude"
	attribute units = "degrees_north"
dataset /lat_poca_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "Latitude of estimated echo location (point of closest approach) [-90,+90]. Positive latitude is North latitude, negative latitude is South latitude. Note the scale factor. Set to lat_20_ku if the echo offset is not estimated, so it always available to use as a plotting coordinate. In SAR mode, this value will be the uncorrected nadir location. In LRM/SARIn, it may change from nadir due to slope correction or interferometry."
	attribute coordinates = "lon_poca_20_ku lat_poca_20_ku"
	attribute long_name = "latitude of the estimated echo location (POCA)"
	attribute scale_factor = 1e-07
	attribute standard_name = "latitude"
	attribute units = "degrees_north"
dataset /load_tide_01: int32, shape (93)
	attribute _FillValue = -2147483648
	attribute comment = "Ocean loading tide. This 1-way correction has been accounted for during the computation of height (see [flag_height_20_ku] to determine if it was applied) to remove the effect of local tidal distortion to the Earth's crust, caused by increasing weight of ocean as local water tide rises. Position is lat_20_ku and lon_20_ku accessed through the ind_first_meas_20hz_01 index."
	attribute institution = "LEGOS/CNES"
	attribute long_name = "ocean loading tide"
	attribute scale_factor = 0.001
	attribute source = "FES2004"
	attribute units = "m"
dataset /lon_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "Longitude of nadir location [-180,+180]. East longitude relative to Greenwich meridian. Note the scale factor."
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute long_name = "20 Hz longitude"
	attribute scale_factor = 1e-07
	attribute standard_name = "longitude"
	attribute units = "degrees_east"
dataset /lon_poca_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "Longitude of estimated echo location (point of closest approach) [-180,+180]. East longitude relative to Greenwich meridian. Note the scale factor. Set to lon_20_ku if the echo offset is not estimated, so it is always available for using as a plotting coordinate. In SAR mode, this value will be the uncorrected nadir location. In LRM/SARIn, it may change from nadir due to slope correction or interferometry."
	attribute coordinates = "lon_poca_20_ku lat_poca_20_ku"
	attribute long_name = "longitude of the estimated echo location (POCA)"
	attribute scale_factor = 1e-07
	attribute standard_name = "longitude"
	attribute units = "degrees_east"
dataset /look_angle_start_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute add_offset = 0.0
	attribute comment = "Value of Look Angle for the first single look echo in the stack. It is the angle between: (a) nadir direction from the satellite CoM to the surface, (b) direction from satellite to surface location. The look angle depends purely on geometry."
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute long_name = "look angle start"
	attribute scale_factor = 1e-07
	attribute units = "rad"
dataset /look_angle_stop_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute add_offset = 0.0
	attribute comment = "Value of Look Angle for the last single look echo in the stack.  It is the angle between: (a) perpendicular from the satellite CoM to the surface, (b) direction from satellite to surface location. The look angle depends purely on geometry."
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute long_name = "data_look angle stop"
	attribute scale_factor = 1e-07
	attribute units = "rad"
dataset /mean_sea_surf_sea_ice_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "Mean sea surface model, referenced to the WGS84 ellipsoid. This model has been optimised for use in computing the surface height anomaly of the polar oceans to derive sea-ice freeboard. The model is a merge of the CLS2011 mean sea-surface and CryoSat data from high latitudes."
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute institution = "UCL"
	attribute long_name = "mean sea surface height above reference ellipsoid"
	attribute scale_factor = 0.001
	attribute source = "UCL13"
	attribute standard_name = "sea_surface_height_above_reference_ellipsoid"
	attribute units = "m"
dataset /mod_dry_tropo_cor_01: int32, shape (93)
	attribute _FillValue = -2147483648
	attribute comment = "Model Dry Tropospheric Correction. This 1-way correction is computed at the [time_cor_01] altimeter time-tag from the interpolation of 2 meteorological fields that surround the altimeter time-tag. This correction has been accounted for during the computation of height (see [flag_height_20_ku] to determine if it was applied) in order to correct for the propagation delay to the radar pulse, caused by the dry-gas component of the Earth's atmosphere. Position is lat_20_ku and lon_20_ku accessed through the ind_first_meas_20hz_01 index."
	attribute institution = "ECMWF"
	attribute long_name = "dry tropospheric correction"
	attribute scale_factor = 0.001
	attribute source = "European Centre for Medium Range Weather Forecasting"
	attribute standard_name = "altimeter_range_correction_due_to_dry_troposphere"
	attribute units = "m"
dataset /mod_wet_tropo_cor_01: int32, shape (93)
	attribute _FillValue = -2147483648
	attribute comment = "Model Wet Tropospheric Correction. This 1-way correction is computed at the time_cor_01 altimeter time-tag from the interpolation of 2 meteorological fields that surround the altimeter time-tag. This correction has been accounted for during the computation of height (see [flag_height_20_ku] to determine if it was applied) in order to correct for the propagation delay to the radar pulse, caused by the H2O component of the Earth's atmosphere. Position is lat_20_ku and lon_20_ku accessed through the ind_first_meas_20hz_01 index."
	attribute institution = "ECMWF"
	attribute long_name = "wet tropospheric correction"
	attribute scale_factor = 0.001
	attribute source = "European Centre for Medium Range Weather Forecasting"
	attribute standard_name = "altimeter_range_correction_due_to_wet_troposphere"
	attribute units = "m"
dataset /noise_power_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "Noise power measurement to be the noise floor of measurement echoes. In SAR/SARIn it is estimated on the L1b 20Hz multilooked power waveform. In LRM it is converted from telemetry units and scaled according to the proper AGC value. This field is set to the default value equal to -9999.99 when the telemetry contains zero. "
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute long_name = "noise power measurement"
	attribute scale_factor = 0.01
	attribute units = "dB"
dataset /ocean_tide_01: int32, shape (93)
	attribute _FillValue = -2147483648
	attribute comment = "Ocean tide. This 1-way correction has been accounted for during the computation of height (see [flag_height_20_ku] to determine if it was applied) to remove the effect of local tide and adjust the measurement to the mean sea surface. This is the pure ocean tide, not including the corresponding loading tide [load_tide_01] or the equilibrium long-period ocean tide height [ocean_tide_eq_01]. The permanent tide (zero frequency) is not included in this parameter because it is included in the geoid [geoid_01] and mean sea surface [mean_sea_surf_sea_ice_01]. Position is lat_20_ku and lon_20_ku accessed through the ind_first_meas_20hz_01 index"
	attribute institution = "LEGOS/CNES"
	attribute long_name = "elastic ocean tide "
	attribute scale_factor = 0.001
	attribute source = "FES2004"
	attribute units = "m"
dataset /ocean_tide_eq_01: int32, shape (93)
	attribute _FillValue = -2147483648
	attribute comment = "Long Period Equilibrium ocean tide. This 1-way correction has been accounted for during the computation of height (see [flag_height_20_ku] to determine if it was applied) to remove the effect of the oceanic response to the single tidal forcing. Position is lat_20_ku and lon_20_ku accessed through the ind_first_meas_20hz_01 index."
	attribute institution = "LEGOS/CNES"
	attribute long_name = "long period equilibrium ocean tide"
	attribute scale_factor = 0.001
	attribute source = "FES2004"
	attribute standard_name = "sea_surface_height_amplitude_due_to_equilibrium_ocean_tide"
	attribute units = "m"
dataset /odle_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "Ocean depth and land elevation model. The model is a merge of ACE land elevation data and Smith and Sandwell ocean bathymetry. See P. A. M. Berry, R. A. Pinnock, R. D. Hilton, and C. P. D. Johnson, ACE: a new GDEM incorporating satellite altimeter derived heights,  ESA Pub. SP-461, 9pp, 2000 and W. H. F Smith, and D. T. Sandwell, Global seafloor topography from satellite altimetry and ship depth soundings, Science, v. 277, p. 1957-1962, 26 Sept., 1997."
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute institution = "ESA ESRIN"
	attribute long_name = "ocean depth/land elevation"
	attribute scale_factor = 0.001
	attribute source = "MACESS"
	attribute units = "m"
dataset /off_nadir_pitch_angle_str_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute add_offset = 0.0
	attribute comment = "Pitch angle with respect to the nadir pointing, measured by the STRs and post-processed by the ground facility."
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute long_name = "antenna bench pitch angle"
	attribute scale_factor = 1e-07
	attribute units = "degrees"
dataset /off_nadir_roll_angle_str_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute add_offset = 0.0
	attribute comment = "Roll angle with respect to the nadir pointing, measured by the STRs and post-processed by the ground facility."
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute long_name = "antenna bench roll angle"
	attribute scale_factor = 1e-07
	attribute units = "degrees"
dataset /off_nadir_yaw_angle_str_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute add_offset = 0.0
	attribute comment = "Yaw angle with respect to the nadir pointing, measured by the STRs and post-processed by the ground facility"
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute long_name = "antenna bench yaw angle"
	attribute scale_factor = 1e-07
	attribute units = "degrees"
dataset /offset_attitude_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "The attitude angle between the nadir vector and the echo point vector. Unused in SAR and SARIn modes."
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute long_name = "20 Hz Ku band echo attitude"
	attribute scale_factor = 1e-06
	attribute units = "rad"
dataset /offset_azimuth_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "The azimuth angle between the north vector and the echo point vector. Unused in SAR and SARIn modes."
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute long_name = "echo azimuth"
	attribute scale_factor = 1e-06
	attribute units = "rad"
dataset /orb_alt_rate_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "Instantaneous altitude rate of the satellite CoM with respect to the reference ellipsoid (WGS84)."
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute long_name = "CoM altitude rate with respect to the reference ellipsoid"
	attribute scale_factor = 0.001
	attribute units = "m/s"
dataset /peakiness_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "Waveform peakiness. Note that this will require different interpretation for SAR and SARIn echoes which do not have the typical pulse-limited echo shape. For LRM and SARIn, the traditional ENVISAT derivation is used. This is the ratio of the maximum power in the waveform to the average of the waveform power to the right hand side of the expected waveform leading edge location. For SAR mode, waveform bins with no power are excluded from the average to account for the specular nature of some waveforms."
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute long_name = "waveform peakiness"
	attribute scale_factor = 0.01
dataset /ph_slope_cor_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "Differential group delay phase difference slope correction across the whole bandwidth (SARIN only). It is composed by fixed contributions from IPFDB and by variable contributions covering differences between the CAL-1 and CAL-4 paths. Applied in L1B SARIn products."
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute long_name = "phase slope correction"
	attribute scale_factor = 1e-06
	attribute units = "rad"
dataset /pole_tide_01: int32, shape (93)
	attribute _FillValue = -2147483648
	attribute comment = "Geocentric polar tide. This 1-way correction has been accounted for during the computation of height (see [flag_height_20_ku] to determine if it was applied) to remove a long-period distortion of the Earth's crust. Although called a 'tide' this is in fact caused by variations in centrifugal force as the Earth's rotational axis moves its geographic location. Position is lat_20_ku and lon_20_ku accessed through the ind_first_meas_20hz_01 index."
	attribute institution = "IERS/CNES"
	attribute long_name = "geocentric pole tide"
	attribute scale_factor = 0.001
	attribute source = "Wahr [1985] Deformation of the Earth induced by polar motion - J. Geophys. Res. (Solid Earth), 90, 9363-9368."
	attribute standard_name = "sea_surface_height_amplitude_due_to_pole_tide"
	attribute units = "m"
dataset /range_1_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "Measured range from the satellite CoM to the surface at the coordinate location [lon_poca_20_ku] [lat_poca_20_ku]. All instrumental [instr_cor_range_rx_20_ku] [uso_cor_applied_20_ku] corrections applied. Contains the Ocean CFI retracker result in LRM mode, the UCL sea-ice retracker results in SAR mode (different method for specular and diffuse echoes), and the UCL margins retracker in SARIn mode. Does not include geophysical corrections."
	attribute coordinates = "lon_poca_20_ku lat_poca_20_ku"
	attribute long_name = "range to surface (retracker 1)"
	attribute scale_factor = 0.001
	attribute standard_name = "altimeter_range"
	attribute units = "m"
dataset /range_2_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "Measured range from the satellite CoM to the surface at the coordinate location [lon_poca_20_ku] [lat_poca_20_ku]. All instrumental [instr_cor_range_rx_20_ku] [uso_cor_applied_20_ku] corrections applied.  Not currently used in SAR and SARIn modes. Contains the UCL land-ice retracker in LRM mode."
	attribute coordinates = "lon_poca_20_ku lat_poca_20_ku"
	attribute long_name = "range to surface (retracker 2)"
	attribute scale_factor = 0.001
	attribute standard_name = "altimeter_range"
	attribute units = "m"
dataset /range_3_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "Measured range from the satellite CoM to the surface at the coordinate location [lon_poca_20_ku] [lat_poca_20_ku]. All instrumental [instr_cor_range_rx_20_ku] [uso_cor_applied_20_ku] corrections applied. Not currently used in SAR and SARIn modes. Contains the OCOG retracker in LRM mode."
	attribute coordinates = "lon_poca_20_ku lat_poca_20_ku"
	attribute long_name = "range to surface (retracker 3)"
	attribute scale_factor = 0.001
	attribute standard_name = "altimeter_range"
	attribute units = "m"
dataset /rec_count_20_ku: int32, shape (1844)
	attribute comment = "Record counter - progressive counter incremented by 1 for each record . Surface Sample counter for SAR/SARIn L2I products. See [seq_count_20_ku] for LRM."
	attribute long_name = "sample counter"
	attribute units = "count"
dataset /retracker_1_cor_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "The correction to range computed by the retracker and used in the computation of height."
	attribute coordinates = "lon_poca_20_ku lat_poca_20_ku"
	attribute long_name = "correction to range (retracker 1)"
	attribute scale_factor = 0.001
	attribute units = "m"
dataset /retracker_1_quality_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "The quality metric (chi^2 of fitted model) computed by the Ocean CFI retracker in LRM mode, the UCL sea-ice retracker in SAR mode (over leads only) and the UCL margins retracker in SARIn mode."
	attribute coordinates = "lon_poca_20_ku lat_poca_20_ku"
	attribute long_name = "quality metric (retracker 1)"
dataset /retracker_2_cor_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "The correction to range computed by the retracker and used in the computation of height. Not currently used in SAR and SARIn modes."
	attribute coordinates = "lon_poca_20_ku lat_poca_20_ku"
	attribute long_name = "correction to range (retracker 2)"
	attribute scale_factor = 0.001
	attribute units = "m"
dataset /retracker_2_quality_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "The quality metric (chi^2 of fitted model) computed by the UCL land-ice retracker in LRM mode. Unused in SAR and SARIn modes."
	attribute coordinates = "lon_poca_20_ku lat_poca_20_ku"
	attribute long_name = "quality metric (retracker 2)"
dataset /retracker_3_cor_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "The correction to range computed by the retracker and used in the computation of height. Not currently used in SAR and SARIn modes."
	attribute coordinates = "lon_poca_20_ku lat_poca_20_ku"
	attribute long_name = "correction to range (retracker 3)"
	attribute scale_factor = 0.001
	attribute units = "m"
dataset /retracker_3_quality_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "Unused in LRM, SAR, and SARIn modes.  "
	attribute coordinates = "lon_poca_20_ku lat_poca_20_ku"
	attribute long_name = "quality metric (retracker 3)"
dataset /retracker_output_10_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "OCOG position [milli-bins]."
	attribute coordinates = "lon_poca_20_ku lat_poca_20_ku"
	attribute long_name = "retracker output 10"
dataset /retracker_output_11_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "OCOG amplitude [scaled Watts]."
	attribute coordinates = "lon_poca_20_ku lat_poca_20_ku"
	attribute long_name = "retracker output 11"
dataset /retracker_output_12_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "OCOG width [milli-bins]."
	attribute coordinates = "lon_poca_20_ku lat_poca_20_ku"
	attribute long_name = "retracker output 12"
dataset /retracker_output_13_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "Window delay converted to range [mm]."
	attribute coordinates = "lon_poca_20_ku lat_poca_20_ku"
	attribute long_name = "retracker output 13"
dataset /retracker_output_14_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "The meaning and units of this field vary by mode. LRM: unused. SAR: unused. SARIn: Tail slope from retracker 1 [1e18W/bin^0.5]."
	attribute coordinates = "lon_poca_20_ku lat_poca_20_ku"
	attribute long_name = "retracker output 14"
dataset /retracker_output_15_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "The meaning and units of this field vary by mode. LRM: unused. SAR: unused. SARIn: Tail decay from retracker 1 [1e6/bin]."
	attribute coordinates = "lon_poca_20_ku lat_poca_20_ku"
	attribute long_name = "retracker output 15"
dataset /retracker_output_16_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "Reserved for retracker 2."
	attribute coordinates = "lon_poca_20_ku lat_poca_20_ku"
	attribute long_name = "retracker output 16"
dataset /retracker_output_17_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "Reserved for retracker 2."
	attribute coordinates = "lon_poca_20_ku lat_poca_20_ku"
	attribute long_name = "retracker output 17"
dataset /retracker_output_18_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "Reserved for retracker 2."
	attribute coordinates = "lon_poca_20_ku lat_poca_20_ku"
	attribute long_name = "retracker output 18"
dataset /retracker_output_19_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "Reserved for retracker 2."
	attribute coordinates = "lon_poca_20_ku lat_poca_20_ku"
	attribute long_name = "retracker output 19"
dataset /retracker_output_20_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "The meaning and units of this field vary by mode. LRM: OCOG amplitude [counts]. SAR: reserved for retracker 3. SARIn: reserved for retracker 3."
	attribute coordinates = "lon_poca_20_ku lat_poca_20_ku"
	attribute long_name = "retracker output 20"
dataset /retracker_output_21_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "The meaning and units of this field vary by mode. LRM: 25% OCOG range correction [mm]. SAR: reserved for retracker 3. SARIn: reserved for retracker 3."
	attribute coordinates = "lon_poca_20_ku lat_poca_20_ku"
	attribute long_name = "retracker output 21"
dataset /retracker_output_22_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "Reserved for retracker 3."
	attribute coordinates = "lon_poca_20_ku lat_poca_20_ku"
	attribute long_name = "retracker output 22"
dataset /retracker_output_23_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "Reserved for retracker 3."
	attribute coordinates = "lon_poca_20_ku lat_poca_20_ku"
	attribute long_name = "retracker output 23"
dataset /retracker_output_3_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "Amplitude fitted by retracker 1 [scaled Watts]."
	attribute coordinates = "lon_poca_20_ku lat_poca_20_ku"
	attribute long_name = "retracker output 3"
dataset /retracker_output_4_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "The meaning and units of this field vary by mode. LRM: retracker 1 leading edge width [milli-bins]. SAR: unused. SARIn: retracker 1 waveform width [milli-bins]."
	attribute coordinates = "lon_poca_20_ku lat_poca_20_ku"
	attribute long_name = "retracker output 4"
dataset /retracker_output_5_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "Currently unused in any mode. "
	attribute coordinates = "lon_poca_20_ku lat_poca_20_ku"
	attribute long_name = "retracker output 5"
dataset /retracker_output_6_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "The meaning and units of this field vary by mode. LRM: retracker 1 noise estimate [counts]. SAR: unused. SARIn: chi^2 of phase fit from retracker 1 [scaled 1e6]."
	attribute coordinates = "lon_poca_20_ku lat_poca_20_ku"
	attribute long_name = "retracker output 6"
dataset /retracker_output_7_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "The meaning and units of this field vary by mode. LRM: unused. SAR: retracker 1 fit parameter sigma for leads [scaled 1e6]. SARIn: phase from retracker 1 [micro-radians]."
	attribute coordinates = "lon_poca_20_ku lat_poca_20_ku"
	attribute long_name = "retracker output 7"
dataset /retracker_output_8_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "The meaning and units of this field vary by mode. LRM: unused. SAR: retracker 1 exponential fit parameter for leads [scaled 1e6]. SARIn: phase slope from tracker 1 [micro-radians/bin]."
	attribute coordinates = "lon_poca_20_ku lat_poca_20_ku"
	attribute long_name = "retracker output 8"
dataset /retracker_output_9_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "The meaning and units of this field vary by mode. LRM: unused. SAR: unused. SARIn: leading edge slope from retracker 1 [scaled 1e3]."
	attribute coordinates = "lon_poca_20_ku lat_poca_20_ku"
	attribute long_name = "retracker output 9"
dataset /sarin_output_10_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "Sea ice peakiness value. Unused in LRM and SAR modes."
	attribute coordinates = "lon_poca_20_ku lat_poca_20_ku"
	attribute long_name = "sarin discriminator output 10"
	attribute scale_factor = 0.01
dataset /sarin_output_1_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "Total power in waveform. Unused in LRM and SAR modes."
	attribute coordinates = "lon_poca_20_ku lat_poca_20_ku"
	attribute long_name = "sarin discriminator output 1"
dataset /sarin_output_2_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "Maximum power in waveform. Unused in LRM and SAR modes."
	attribute coordinates = "lon_poca_20_ku lat_poca_20_ku"
	attribute long_name = "sarin discriminator output 2"
dataset /sarin_output_3_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "Mean power of waveform. Unused in LRM and SAR modes."
	attribute coordinates = "lon_poca_20_ku lat_poca_20_ku"
	attribute long_name = "sarin discriminator output 3"
dataset /sarin_output_4_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "Bin of maximum power. Unused in LRM and SAR modes."
	attribute coordinates = "lon_poca_20_ku lat_poca_20_ku"
	attribute long_name = "sarin discriminator output 4"
dataset /sarin_output_5_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "Bin of half maximum power. Unused in LRM and SAR modes."
	attribute coordinates = "lon_poca_20_ku lat_poca_20_ku"
	attribute long_name = "sarin discriminator output 5"
dataset /sarin_output_6_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "Maximum coherence. Unused in LRM and SAR modes."
	attribute coordinates = "lon_poca_20_ku lat_poca_20_ku"
	attribute long_name = "sarin discriminator output 6"
dataset /sarin_output_7_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "Bin of maximum coherence. Unused in LRM and SAR modes."
	attribute coordinates = "lon_poca_20_ku lat_poca_20_ku"
	attribute long_name = "sarin discriminator output 7"
dataset /sarin_output_8_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "First power bin. Unused in LRM and SAR modes."
	attribute coordinates = "lon_poca_20_ku lat_poca_20_ku"
	attribute long_name = "sarin discriminator output 8"
dataset /sarin_output_9_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "Last power bin. Unused in LRM and SAR modes."
	attribute coordinates = "lon_poca_20_ku lat_poca_20_ku"
	attribute long_name = "sarin discriminator output 9"
dataset /sat_vel_vec_20_ku: int32, shape (1844, 3)
	attribute _FillValue = -2147483648
	attribute comment = "Satellite velocity vector, described in the International Terrestrial Reference Frame in the International Earth Fixed System. This is not a unit vector as the velocity magnitude is also required. The 3 components are given according to the'space_3d' dimension: [1] x, [2] y, [3] z."
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute long_name = "satellite velocity vector in itrf"
	attribute scale_factor = 0.001
	attribute units = "m/s"
dataset /sea_ice_concentration_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "Sea ice concentration derived from NSIDC SSM/I data. Unused in LRM mode."
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute institution = "UCL"
	attribute long_name = "sea ice area fraction"
	attribute scale_factor = 0.1
	attribute source = "UCL"
	attribute standard_name = "sea_ice_area_fraction"
	attribute units = "percent"
dataset /sea_state_bias_20_ku: int16, shape (1844)
	attribute _FillValue = -32768
	attribute comment = "Sea State Bias Correction. This sea state bias has been corrected for (if indicated by [flag_cor_applied_20_ku]) in the height estimates over open-ocean in LRM mode. Not used in SAR/SARIn modes."
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute institution = "CLS/ESA"
	attribute long_name = "sea state bias correction"
	attribute scale_factor = 0.001
	attribute source = "Labroue2007"
	attribute standard_name = "sea_surface_height_bias_due_to_sea_surface_roughness"
	attribute units = "m"
dataset /seq_count_20_ku: int16, shape (1844)
	attribute add_offset = 0
	attribute comment = "Source Sequence Counter read from the L0 echo telemetry packet (LRM only). See [rec_count_20_ku] for SAR/SARIn."
	attribute long_name = "source sequence counter"
	attribute scale_factor = 1
	attribute units = "count"
dataset /sig0_1_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "The measured backscatter from the surface, corrected for instrument effects [instr_cor_gain_rx_20_ku], and including a system bias that calibrates the results against previous missions. The backscatter is computed from the amplitude of the waveform in Watts, as measured by the Ocean CFI retracker in LRM mode. The measured power is used to solve the radar equation to recover the value for backscatter. For SAR and SARIn mode, the power waveform is first convolved with a function to produce an LRM-like waveform, that is then retracked with OCOG to produce the amplitude estimate."
	attribute coordinates = "lon_poca_20_ku lat_poca_20_ku"
	attribute long_name = "backscatter coefficient (retracker 1)"
	attribute scale_factor = 0.01
	attribute standard_name = "surface_backwards_scattering_coefficient_of_radar_wave"
	attribute units = "dB"
dataset /sig0_2_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "The measured backscatter from the surface, corrected for instrument effects [instr_cor_gain_rx_20_ku], and including a system bias that calibrates the results against previous missions. The backscatter is computed from the amplitude of the waveform in Watts, as measured by the UCL land-ice retracker. The measured power is used to solve the radar equation to recover the value for backscatter. Not currently used in SAR and SARIn modes."
	attribute coordinates = "lon_poca_20_ku lat_poca_20_ku"
	attribute long_name = "backscatter coefficient (retracker 2)"
	attribute scale_factor = 0.01
	attribute standard_name = "surface_backwards_scattering_coefficient_of_radar_wave"
	attribute units = "dB"
dataset /sig0_3_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "The measured backscatter from the surface, corrected for instrument effects [instr_cor_gain_rx_20_ku], and including a system bias that calibrates the results against previous missions. The backscatter is computed from the amplitude of the waveform in Watts, as measured by the OCOG retracker. The measured power is used to solve the radar equation to recover the value for backscatter. Not currently used in SAR and SARIn modes."
	attribute coordinates = "lon_poca_20_ku lat_poca_20_ku"
	attribute long_name = "backscatter coefficient (retracker 3)"
	attribute scale_factor = 0.01
	attribute standard_name = "surface_backwards_scattering_coefficient_of_radar_wave"
	attribute units = "dB"
dataset /slope_dop_cor_20_ku: int16, shape (1844)
	attribute _FillValue = -32768
	attribute comment = "This value has replaced the use of dop_cor_20_ku in the range used to compute the height values. This is done to correct for the effect of sloping terrain. Unused in SAR and SARIn modes."
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute long_name = "Slope Doppler correction to altimeter range"
	attribute scale_factor = 0.001
	attribute units = "m"
dataset /snow_density_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "Snow density. Currently set to a fixed average value for all records. The intention is to replace this with a model in future. Unused in LRM mode."
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute institution = "UCL"
	attribute long_name = "snow density"
	attribute scale_factor = 1.0
	attribute source = "UCL"
	attribute standard_name = "snow_density"
	attribute units = "kg/m^3"
dataset /snow_depth_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "Snow depth from climatology. Unused in LRM mode. S. G. Warren, I. G. Rigor, and N. Untersteiner, Snow depth on Arctic sea ice., 1999."
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute institution = "UCL"
	attribute long_name = "snow depth"
	attribute scale_factor = 0.001
	attribute source = "Warren"
	attribute standard_name = "surface_snow_thickness"
	attribute units = "m"
dataset /solid_earth_tide_01: int32, shape (93)
	attribute _FillValue = -2147483648
	attribute comment = "Solid earth tide. This 1-way correction has been accounted for during the computation of height (see [flag_height_20_ku] to determine if it was applied) to remove the effect of local tidal distortion to the Earth's crust, in particular by the sun and moon. Position is lat_20_ku and lon_20_ku accessed through the ind_first_meas_20hz_01 index."
	attribute long_name = "solid earth tide"
	attribute scale_factor = 0.001
	attribute source = "Cartwright and Edden [1973] Corrected tables of tidal harmonics - J. Geophys. J. R. Astr. Soc., 33, 253-264."
	attribute standard_name = "sea_surface_height_amplitude_due_to_earth_tide"
	attribute units = "m"
dataset /space_3d: int16, shape (3)
	attribute comment = "Set to be compliant with the CF convention. Counts 0..2."
	attribute long_name = "space dimension"
	attribute units = "count"
// space_3d: first 0, last 2, count 3
dataset /ssha_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "Sea surface height anomaly. Computed as [ssha_20_ku] = [height_1_20_ku] - [mean_sea_surf_sea_ice_20_ku]. Unused in LRM mode."
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute long_name = "sea-surface height anomaly"
	attribute scale_factor = 0.001
	attribute units = "m"
dataset /ssha_interp_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "Sea surface height anomaly computed using sea surface height anomaly [ssha_20_ku] interpolated to the current location. Unused in LRM mode."
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute long_name = "interpolated sea-surface height anomaly"
	attribute scale_factor = 0.001
	attribute units = "m"
dataset /ssha_interp_numval_back_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "Number of backward (behind nadir) SSHA points used in the interpolation of SSHA at this location. Unused in LRM mode."
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute long_name = "number of backward SSHA interpolation points"
	attribute units = "count"
dataset /ssha_interp_numval_fwd_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "Number of forward (ahead of nadir)SSHA points used in the interpolation of SSHA at this location. Unused in LRM mode."
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute long_name = "number of forward SSHA interpolation points"
	attribute units = "count"
dataset /ssha_interp_rms_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "Estimated error in [ssha_interp_20_ku]. Unused in LRM mode."
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute long_name = "ssha interpolation error"
	attribute scale_factor = 0.001
	attribute units = "m"
dataset /ssha_interp_time_back_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "Delta in time between this record and the most backward (smallest time) SSHA point used in the interpolation of SSHA at this location. Unused in LRM mode."
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute long_name = "backward timespan of SSHA interpolation points"
	attribute scale_factor = 0.001
	attribute units = "s"
dataset /ssha_interp_time_fwd_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "Delta in time between this record and the most forward (largest time) SSHA point used in the interpolation of SSHA at this location. Unused at LRM mode."
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute long_name = "forward timespan of SSHA interpolation points"
	attribute scale_factor = 0.001
	attribute units = "s"
dataset /stack_centre_20_ku: int16, shape (1844)
	attribute _FillValue = -32768
	attribute add_offset = 0.0
	attribute comment = "Position of the centre of Gaussian that fits the range integrated power of the single look echoes within a stack. Stack centre as function of stack beam number."
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute long_name = "gaussian power fitting: center wrt beam number"
	attribute scale_factor = 0.01
	attribute units = "count"
dataset /stack_centre_angle_20_ku: int16, shape (1844)
	attribute _FillValue = -32768
	attribute add_offset = 0.0
	attribute comment = "Position of the centre of Gaussian that fits the range integrated power of the single look echoes within a stack. Centre as function of the boresight angle, that is the angle between: (a) antenna boresight direction, (b) direction from satellite to surface location. The pointing angle depends on geometry and attitude (roll and pitch)"
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute long_name = "gaussian power fitting: center wrt boresight angle number"
	attribute scale_factor = 1e-06
	attribute units = "rad"
dataset /stack_centre_look_angle_20_ku: int16, shape (1844)
	attribute _FillValue = -32768
	attribute add_offset = 0.0
	attribute comment = "Position of the centre of Gaussian that fits the range integrated power of the single look echoes within a stack. Centre as function of the look angle, that is the angle between: (a) nadir direction from the satellite CoM to the surface, (b) direction from satellite to surface location. Read 'Pitch Estimation for CryoSat by Analysis of Stacks of Single-Look Echoes' - M. Scagliola, M. Fornari and N. Tagliani - IEEE Geoscience and Remote Sensing Letters, vol. 12, no. 7, pp. 1561-1565, July 2015. doi: 10.1109/LGRS.2015.2413135"
	attribute long_name = "gaussian power fitting: center wrt look angle"
	attribute scale_factor = 1e-06
	attribute units = "rad"
dataset /stack_gaussian_fitting_residuals_20_ku: int16, shape (1844)
	attribute _FillValue = -32768
	attribute add_offset = 0.0
	attribute comment = "Residuals of Gaussian that fits the range integrated power of the single look echoes within a stack. It is the root mean squared error between the Gaussian fitting and the range integrated power of the single look echoes within a stack."
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute long_name = "gaussian power fitting: residuals fitting"
	attribute scale_factor = 0.01
	attribute units = "dbW"
dataset /stack_kurtosis_20_ku: int16, shape (1844)
	attribute _FillValue = -999
	attribute add_offset = 0.0
	attribute comment = "4th central moment computed on the range integrated power of the single look echoes within a stack. Kurtosis as function of stack beam number."
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute long_name = "gaussian power fitting: kurtosis wrt beam number"
	attribute scale_factor = 0.01
	attribute units = "count"
dataset /stack_number_after_weighting_20_ku: int16, shape (1844)
	attribute _FillValue = -32768
	attribute add_offset = 0
	attribute comment = "Number of contributing beams in the stack after weighting: number of single look echoes in the stack after the Surface Sample Stack weighting is applied."
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute long_name = "number of contributing beams in the stack after weighting"
	attribute scale_factor = 1
	attribute units = "count"
dataset /stack_number_before_weighting_20_ku: int16, shape (1844)
	attribute _FillValue = -32768
	attribute add_offset = 0
	attribute comment = "number of contributing beams in the stack before weighting: number of single look echoes in the stack before that the Surface Sample Stack weighting is applied."
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute long_name = "number of contributing beams in the stack before weighting"
	attribute scale_factor = 1
	attribute units = "count"
dataset /stack_peakiness_20_ku: int16, shape (1844)
	attribute _FillValue = -32768
	attribute add_offset = 0.0
	attribute comment = "Peakiness of the range integrated power of the single look echoes within a stack."
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute long_name = "gaussian power fitting: peakiness wrt beam number"
	attribute scale_factor = 0.01
	attribute units = "count"
dataset /stack_scaled_amplitude_20_ku: int16, shape (1844)
	attribute _FillValue = -32768
	attribute add_offset = 0.0
	attribute comment = "Amplitude of Gaussian that fits the range integrated power of the single look echoes within a stack."
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute long_name = "gaussian power fitting: amplitude"
	attribute scale_factor = 0.01
	attribute units = "dB"
dataset /stack_skewness_20_ku: int16, shape (1844)
	attribute _FillValue = -999
	attribute add_offset = 0.0
	attribute comment = "3rd central moment computed on the range integrated power of the single look echoes within a stack.Skewness as function of stack beam number."
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute long_name = "gaussian power fitting: skewness wrt beam number"
	attribute scale_factor = 0.01
	attribute units = "count"
dataset /stack_std_20_ku: int16, shape (1844)
	attribute _FillValue = -32768
	attribute add_offset = 0.0
	attribute comment = "Standard deviation of Gaussian that fits the range integrated power of the single look echoes within a stack. Standard deviation as function of stack beam number."
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute long_name = "Gaussian power fitting: std wrt beam number"
	attribute scale_factor = 0.01
	attribute units = "count"
dataset /stack_std_angle_20_ku: int16, shape (1844)
	attribute _FillValue = -32768
	attribute add_offset = 0.0
	attribute comment = "Standard deviation of Gaussian that fits the range integrated power of the single look echoes within a stack. Standard deviation as function of the boresight angle, that is the angle between: (a) antenna boresight direction, (b) direction from satellite to surface location. The pointing angle depends on geometry and attitude (roll and pitch)"
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute long_name = "gaussian power fitting: std wrt boresight angle"
	attribute scale_factor = 1e-06
	attribute units = "rad"
dataset /surf_type_20_ku: int8, shape (1844)
	attribute _FillValue = -128
	attribute comment = "A 4-state surface type mask for Cryosat2 data for the surface type at the nadir location. Computed by combining data from different sources: GMT, GlobCover, Modis Mosaic of Antarctica, and Water body outlines from LEGOS"
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute flag_meanings = "ocean lake_enclosed_sea ice land"
	attribute flag_values = 0, 1, 2, 3
	attribute institution = "CLS/CNES"
	attribute long_name = "surface type from mask"
	attribute source = "GMT, GlobCover, Modis Mosaic of Antarctica, and Water body outlines from LEGOS"
dataset /swh_ocean_20_ku: int16, shape (1844)
	attribute _FillValue = -32768
	attribute comment = "Computed directly from sigma c   as computed by the Ocean CFI retracker in LRM mode only. No bias correction to cross-calibrate with previous missions applied. Not currently used in SAR and SARIn modes."
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute long_name = "significant waveheight"
	attribute scale_factor = 0.001
	attribute standard_name = "sea_surface_wave_significant_height"
	attribute units = "m"
dataset /time_20_ku: float64, shape (1844)
	attribute calendar = "gregorian"
	attribute comment = "TAI time counted in seconds since 2000-01-01 00:00:00."
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute long_name = "TAI time (sec. since 2000-01-01)"
	attribute standard_name = "time"
	attribute units = "seconds since 2000-01-01 00:00:00.0"
// time_20_ku: first 606892989.132987, last 606893071.565662, count 1844
dataset /time_cor_01: float64, shape (93)
	attribute calendar = "gregorian"
	attribute comment = "TAI time counted in seconds since 2000-01-01 00:00:00. Time refers to the instant which the corrections are referred to. "
	attribute long_name = "TAI time (sec. since 2000-01-01)"
	attribute standard_name = "time"
	attribute units = "seconds since 2000-01-01 00:00:00.0"
// time_cor_01: first 606892989.132987, last 606893071.43155, count 93
dataset /uso_cor_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute add_offset = 0
	attribute comment = "USO correction factor defined as the ratio between the nominal and the modelled value. This correction accounts for the different between the nominal frequency provided in the IPFDB and the modelled frequency deviation provided by the DORIS USO drift file. Correction to be applied by the user. "
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute long_name = "uso correction (2-way)"
	attribute scale_factor = 1e-12
	attribute units = "seconds"
dataset /uso_cor_applied_20_ku: int32, shape (1844)
	attribute _FillValue = -2147483648
	attribute comment = "USO correction to range as applied in the L1 processing. This value is included in the range and height estimates. This value is [uso_cor_20_ku] converted from 2-way time to 1-way range."
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute long_name = "uso correction (1-way range)"
	attribute scale_factor = 0.001
	attribute units = "m"
dataset /wind_speed_alt_20_ku: int16, shape (1844)
	attribute _FillValue = -32768
	attribute comment = "Computed directly from backscatter via a CFI call using the Chelton model for ENVISAT. No bias correction to cross-calibrate with previous missions applied. Not currently used in SAR and SARIn modes."
	attribute coordinates = "lon_20_ku lat_20_ku"
	attribute long_name = "altimeter wind speed"
	attribute scale_factor = 0.001
	attribute standard_name = "wind_speed"
	attribute units = "m/s"