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Global Attributes:	comment: Maximum antenna gain, from on-ground characterization long_name: Maximum antenna gain (Ku-band) units: dB scale_factor: 1.0E-6 _FillValue: -2147483647 comment: Intra-Burst Phase correction to be applied to the SAR Ku waveforms. This is the averaged phase progression of the CAL1 main lobe maximum power range bin along a burst long_name: Intra-Burst phase correction (Ku-band) units: rad _FillValue: -2147483647 scale_factor: 1.0E-6 source: xref_intra_burst_corrections_ku _ChunkSizes: 64 comment: Burst Power correction to be applied to the SAR Ku waveforms. This is the averaged power progression of the CAL1 main lobe maximum power along a burst long_name: Burst power correction (Ku-band) units: dB _FillValue: -2147483647 scale_factor: 1.0E-6 source: xref_intra_burst_corrections_ku _ChunkSizes: 64 _Unsigned: false comment: It contains the FF processing switches applied to this product. For more details, see ESA L1 Product Format Specification 'JCID-ESA-GP-1005' flag_meaning: range_weighting_applied azimuth_weighting_applied range_antenna_compensation_applied azimuth_antenna_compensation_applied grating_lobe_mitigation_applied _FillValue: -1 flag_masks: 1, 2, 4, 8, 16 valid_range: 0, 31 long_name: Collection of parameters for the FF chain from the processor configuration file (Ku-band) _Unsigned: false comment: Method used for fully focused processing. _FillValue: -1 flag_values: 0, 1 valid_range: 0, 1 long_name: Method used for fully focused processing (Ku-band) flag_meaning: back_projection omega_k comment: Ratio of losses between the RA transmission/reception and the Calibration paths. Defined as (in dB): P_losses_science - P_losses_cal1 - G_ant^2. Value comes from on-ground instrument characterization. _FillValue: -2147483647 scale_factor: 1.0E-6 long_name: Ratio of losses between the RA transmission/reception and the Calibration paths. (Ku-band) units: dB comment: Integration (exposure) time over which the coherent integration is performed to generate single look waveforms. It applies to FF algorithms operating in the time domain. The integration time determines the ground resolution according to the equation: 0.886 * wavelength * satellite_altitude / (2 * satellite_speed *integration_time). long_name: Integration time to focus the single look waveforms (Ku-band) units: s _FillValue: 0.0 _Unsigned: false flag_values: 0, 1 valid_range: 0, 1 long_name: Method used for the multilooking (Ku-band) flag_meaning: time_domain frequency_domain comment: Method used for multilooking. _FillValue: -1 comment: The approximate waveform spacing in frequency (Hz). The actual spacing will vary slightly along the orbit depending on orbital and processing parameters. long_name: Waveform spacing in frequency (Ku-band) units: Hz _FillValue: 0.0 comment: Doppler bandwidth that is processed to generate the single look waveforms. It applies to FF algorithms operating in the frequency domain. _FillValue: 0.0 long_name: Doppler bandwidth used to focus the single look waveforms. (Ku-band) units: Hz _Unsigned: false comment: It contains the processing switches applied to this product. For more details, see ESA L1 Product Format Specification 'JC-ID-ESA-GP-0174' long_name: Collection of parameters from the processor configuration file (Ku-band) _FillValue: -1 flag_masks: 1, 2, 4, 8, 16 valid_range: 0, 31 flag_meaning: uso_correction_activated cal1_correction_activated cal1_power_cor_max cal2_correction_activated cal1_delay_cor_max comment: The absolute 1-way group delay contribution for parts outside the calibration loop long_name: Range correction: 1-way external group delay from ground characterisation (Ku-band) units: m _FillValue: -2147483647 scale_factor: 1.0E-4 comment: The instrument samples the waveforms with a 395 MHz clock, providing a nominal_sampling = c / 395e6 / 2 = ~0.379m (with c = speed of light). In addition, the ground processor can apply an oversampling factor, providing a waveform_sampling = nominal_sampling / range_oversampling_factor. Note that the altimeter range resolution is fixed and given by the chirp bandwidth of 320 MHz: c / 320e6 / 2 = ~0.468m units: 1 _FillValue: -32767 long_name: Oversampling factor applied in the range compression (FFT) (Ku-band) comment: The SAR RAW channel is subject to a specific on-board digital processing that affects the signal scaling such as ADC, FFTs and the range compression gain. This is calibrated directly using the CAL1 max/total power and does not need further characterization. This variable contains the (potential) residual gain to be applied to the SAR RAW waveform long_name: Residual on-board fixed digital processing gain for SAR RAW (Ku-band) units: dB _FillValue: -2147483647 scale_factor: 1.0E-6 comment: The SAR RMC channel is subject to a specific on-board digital processing that affects the signal scaling such as ADC, FFTs and the range compression gain. This is calibrated directly using the CAL1 max/total power and does not need further characterization. This variable contains the residual gain to be applied to the SAR RMC waveform long_name: Residual on-board fixed digital processing gain for RMC (Ku-band) units: dB _FillValue: -2147483647 scale_factor: 1.0E-6 _NCProperties: version=1\|netcdflibversion=4.6.0\|hdf5libversion=1.11.5 history: Tue Apr 14 22:33:44 2020: C:\nco\ncks -x -v data/ku/along_track_coverage FF__ML_empty_5.nc new\FF__ML_empty_5.nc NCO: netCDF Operators version 4.9.3-alpha02 (Homepage = http://nco.sf.net, Code = http://github.com/nco/nco) Conventions: CF-1.7 product_name: L1B_FF_ML_20170215T094307_20170215T094311 title: L1B FF ML source: AREALT_FF1 creation_time: 2021-06-09T19:55:36.308 references: P4 GPP L1 Product Format Specification, JC-ID-ESA-GP-0174 issue 3.1 mission_name: CryoSat altimeter_sensor_name: SIRAL xref_altimeter_level1a: CS_OFFL_SIR1SAR_FR_20170215T094144_20170215T094326_C001.DBL Unlimited_Dimension: samples data_ku_time: 765

Variables:	space_3d: Array of 8 bit Bytes [space_3d = 0..2] space_3d: _Unsigned: false comment: counter to index Cartesian coordinates long_name: counter to index Cartesian coordinates units: 1 _ChunkSizes: 3
	pulses: Array of 8 bit Bytes [pulses = 0..63] pulses: _Unsigned: false comment: counter to index the pulses within a burst long_name: counter to index the pulses within a burst units: 1 _ChunkSizes: 64
	samples: Array of 16 bit Integers [samples = 0..255] samples: comment: counter to index the number of I and Q samples within a pulse long_name: counter to index the number of I and Q samples within a pulse units: 1 _ChunkSizes: 512
	/data/ku/altimeter_clock: Array of 32 bit Integers [time = 0..764] time: comment: This is the actual altimeter clock. The altimeter clock is based upon the USO clock. The nominal USO clock is 10MHz, while the nominal altimeter clock is 395 MHz. The actual USO clock is provided regularly as a drift information: based on the USO drift, the actual altimeter clock is computed, assuming a linear dependency coordinates: longitude latitude long_name: Altimeter clock (Ku-band) units: Hz _FillValue: -2147483647 add_offset: 3.95E8 scale_factor: 1.0E-6 _ChunkSizes: 500
	/data/ku/altitude: Array of 32 bit Integers [time = 0..764] time: comment: Altitude of the satellite Centre of Mass above the reference ellipsoid (WGS-84) coordinates: longitude latitude long_name: Centre of Mass altitude above the reference ellipsoid (WGS-84) (Ku-band) standard_name: altitude units: m _FillValue: -2147483647 scale_factor: 1.0E-4 add_offset: 720000.0 _ChunkSizes: 500
	/data/ku/altitude_rate: Array of 32 bit Integers [time = 0..764] time: coordinates: longitude latitude long_name: Centre of Mass altitude rate with respect to the reference ellipsoid (WGS-84) (Ku-band) units: m/s _FillValue: -2147483647 scale_factor: 1.0E-4 comment: Instantaneous altitude rate at the Centre of Mass with respect to the reference ellipsoid (WGS-84) _ChunkSizes: 500
	/data/ku/attenuator_calibrated: Array of 16 bit Integers [time = 0..764] time: comment: The ISPs contain the ATT command applied within a radar cycle. The actual ATT value, that slightly differs from the nominal one, is extracted from a look-up table coordinates: longitude latitude long_name: Power scaling: ATT calibrated (from ATT table) (Ku-band) source: xref_attenuator_table_ku units: dB _FillValue: -32767 scale_factor: 0.01 _ChunkSizes: 500
	/data/ku/cal1_power: Array of 16 bit Integers [time = 0..764] time: comment: Max/total power of the instrument PTR from CAL1 measurement. It can be either the max or the total power according to a switch, given in the variable processing_configuration_flag. It has been corrected for: (a) calibrated attenuator correction, (b) variable digital gain, (c) residual Cal1 fixed digital gain long_name: Instrument Impulse Response max/total power (Ku-band) coordinates: longitude latitude source: xref_cal1_power_ku units: dB _FillValue: -32767 scale_factor: 0.01 _ChunkSizes: 500
	/data/ku/ff_mcd_flags: Array of 8 bit Bytes [time = 0..764] time: _Unsigned: false comment: It contains error flags related to the FF processing chain. For more details, see ESA L1 Product Format Specification 'JC-ID-ESA-GP-1005' coordinates: longitude latitude flag_meaning: range_weighting_error azimuth_weighting_error range_antenna_compensation_error azimuth_antenna_compensation_error long_name: Measurement confidence data (MCD): collection of error flags for the FF processor (Ku-band) _FillValue: -1 flag_masks: 1, 2, 4, 8 valid_range: 0, 15 _ChunkSizes: 500
	/data/ku/hn_mean: Array of 32 bit Unsigned Integers [time = 0..764] time: comment: This field is for monitoring the H0/COR2 decoding into CAI (Coarse Altitude instruction) and FAI (Fine Altitude Instruction). In LRM it is the altitude instruction (CAI+FAI) averaged and rounded over the radar cycle. In SAR, it is the altitude instruction (CAI+FAI) averaged and rounded over the burst closest to the nadir of the surface location. NOTE: T0 = 1/altimeter_clock_ku coordinates: longitude latitude long_name: Mean altitude instruction, for monitoring purpose (Ku-band) _FillValue: -1 units: T0/16/64 _ChunkSizes: 500
	/data/ku/l1b_record_counter: Array of 32 bit Integers [time = 0..764] time: comment: The L1B record counter, starting from 0 for each product coordinates: longitude latitude long_name: L1B Record Counter (Ku-band) _FillValue: -2147483647 units: 1 _ChunkSizes: 500
	/data/ku/latitude: Array of 32 bit Integers [time = 0..764] time: comment: Latitude of measurement [-90, +90]: Positive at North, Negative at South coordinates: longitude latitude long_name: Latitude (positive N, negative S) (Ku-band) standard_name: latitude units: degrees_north _FillValue: -2147483647 scale_factor: 1.0E-6 _ChunkSizes: 500
	/data/ku/longitude: Array of 32 bit Integers [time = 0..764] time: comment: Longitude of measurement [0, 360]: Positive at East coordinates: longitude latitude long_name: Longitude (degrees East) (Ku-band) standard_name: longitude units: degrees_east _FillValue: -2147483647 scale_factor: 1.0E-6 _ChunkSizes: 500
	/data/ku/manoeuvre_flag: Array of 8 bit Bytes [time = 0..764] time: _Unsigned: false comment: Flag derived combining information from the NAVATT file coordinates: longitude latitude flag_meaning: no_manoeuvre manoeuvre_ongoing long_name: Flag indicating whether the satellite is in a manoeuvre (Ku-band) source: xref_manoeuvre _FillValue: -1 flag_values: 0, 1 valid_range: 0, 1 _ChunkSizes: 500
	/data/ku/mcd_flags: Array of 16 bit Integers [time = 0..764] time: comment: It contains error flags related to the processing chain. For more details, see ESA L1 Product Format Specification 'JC-ID-ESA-GP-0174' coordinates: longitude latitude flag_meaning: attitude_retrieval_error com_retrieval_error uso_retrieval_error manoeuvre_flag_retrieval_error surf_class_retrieval_error cal2_correction_retrieval_error cal1_power_retrieval_error internal_delay_retrieval_error attenuator_table_retrieval_error intra_burst_retrieval_error long_name: Measurement Confidence Data (MCD): collection of error flags (Ku-band) _FillValue: -1 flag_masks: 1, 2, 4, 8, 16, 32, 64, 128, 256, 512 valid_range: 0, 1023 _ChunkSizes: 500
	/data/ku/num_single_looks: Array of 16 bit Integers [time = 0..764] time: comment: Number of single look waveforms incoherently averaged to generate the multi-looked waveform. coordinates: longitude latitude long_name: Number of single looks averaged in a multilooked waveform (Ku-band) units: 1 _FillValue: -32767 _ChunkSizes: 500
	/data/ku/off_nadir_pitch_angle_pf: Array of 32 bit Integers [time = 0..764] time: comment: Pitch angle with respect to the nadir pointing, measured by the STRs and post-processed by AOCS or by ground facility. The attribute ?added_bias? contains the added pitch bias. Note: nominal pointing is at satellite nadir (antenna perpendicular to ellipsoid) and corresponds to: pitch = 0 coordinates: longitude latitude long_name: Off nadir pitch angle, measured by the STRs (Ku-band) standard_name: platform_pitch_angle units: degree _FillValue: -2147483647 added_bias: 0.0 scale_factor: 1.0E-7 _ChunkSizes: 500
	/data/ku/off_nadir_roll_angle_pf: Array of 32 bit Integers [time = 0..764] time: comment: Roll angle with respect to the nadir pointing, measured by the STRs and post-processed by AOCS or by ground facility. The attribute ?added_bias? contains the added roll bias. Note: nominal pointing is at satellite nadir (antenna perpendicular to ellipsoid) and corresponds to: roll = 0 coordinates: longitude latitude long_name: Off nadir roll angle, measured by the STRs (Ku-band) standard_name: platform_roll_angle units: degree _FillValue: -2147483647 added_bias: 0.0 scale_factor: 1.0E-7 _ChunkSizes: 500
	/data/ku/off_nadir_yaw_angle_pf: Array of 32 bit Integers [time = 0..764] time: comment: Yaw angle with respect to the nadir pointing, measured by the STRs and post-processed by AOCS or by ground facility. The attribute ?added_bias? contains the added yaw bias. Note: nominal pointing is at satellite nadir (antenna perpendicular to ellipsoid) and corresponds to: yaw = 0 coordinates: longitude latitude long_name: Off nadir yaw angle, measured by the STRs (Ku-band) standard_name: platform_yaw_angle units: degree _FillValue: -2147483647 added_bias: 0.0 scale_factor: 1.0E-7 _ChunkSizes: 500
	/data/ku/p4_instrument_configuration_flags: Array of 8 bit Bytes [time = 0..764] time: _Unsigned: false comment: It contains flags from ISPs related to P4 configuration and tracking coordinates: longitude latitude flag_meaning: closed_loop_gain_with_back_off acquisition DEM_MRAM_read_access_disabled loss_of_track navigation_bulletin_status_KO long_name: Collection of flags from the P4 Instrument Source Packets (Ku-band) _FillValue: -1 flag_masks: 1, 2, 4, 8, 16 valid_range: 0, 31 _ChunkSizes: 500
	/data/ku/p4_mode_flag: Array of 8 bit Bytes [time = 0..764] time: _Unsigned: false comment: Flag containing the P4 mode identifier from the P4 Instruments Source Packets coordinates: longitude latitude flag_meaning: Acquisition LRM_CL LRM_OL LX_CL LX_OL LRMC_CL LRMC_OL LX2_CL TRANSPONDER Self_test CAL1_INSTR CAL1_LRM CAL1_SAR CAL1_RMC CAL2 long_name: P4 mode identifier from the P4 Instrument Source Packets (Ku-band) _FillValue: -1 flag_values: 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 valid_range: 5, 19 _ChunkSizes: 500
	/data/ku/pnr_estimation: Array of 16 bit Integers [time = 0..764] time: comment: Peak to Noise Ratio estimation done on the L1B waveform as: peak / noise_level. Where noise_level is estimated from the first n (configurable) samples coordinates: longitude latitude long_name: Peak to Noise Ratio estimation on the L1B waveform (Ku-band) units: dB _FillValue: -32767 scale_factor: 0.01 _ChunkSizes: 500
	/data/ku/position_vector: Array of 64 bit Reals [time = 0..764][space_3d = 0..2] time: space_3d: comment: Position Vector at the centre of mass in ITRF. The 3 components are given according to the 'space_3d' dimension: [1] x, [2] y, [3] z long_name: Position vector in ITRF, components: [1] x, [2] y, [3] z (Ku-band) units: m _FillValue: NaN coordinates: longitude latitude _ChunkSizes: 1, 3
	/data/ku/power_scaling_to_antenna: Array of 16 bit Integers [time = 0..764] time: comment: The overall instrument gain applied to the L1B waveform, including: (a) attenuator_calibrated, (b) variable_digital_gain, (c) cal1_power (d) g_scaling (e) antenna_gain. This variable is applied to the power waveform (at L1B in the LR chain and at L1A in the HR chain). Once applied, the L1B waveform power corresponds to the ratio between: Received_power / Transmitted_Power coordinates: longitude latitude long_name: Power scaling: overall instrument gain (Ku-band) units: dB _FillValue: -32767 scale_factor: 0.01 _ChunkSizes: 500
	/data/ku/power_waveform: Array of 16 bit Unsigned Integers [time = 0..764][samples = 0..255] time: samples: comment: The L1B FF-ML Power waveform is a fully calibrated, high resolution, multi-looked waveform in the time domain. It includes: (a) all calibrations, which have been applied at L1A, (b) configuration according to processing_configuration_flags and ff_processing_configuration_flag, (c) final scaling, given in the variable 'waveform_scale_factor', in order to best fit the waveform into 2 bytes. coordinates: longitude latitude long_name: L1B Fully Focused Multi-Looked power waveform: scaled 0-65534 (Ku-band) units: 1 _FillValue: -1 _ChunkSizes: 1, 512
	/data/ku/ptr_main_lobe_width: Array of 32 bit Integers [time = 0..764] time: comment: Width of the CAL1 waveform main lobe at -3dB. coordinates: longitude latitude long_name: PTR main lobe width (Ku-band) units: m _FillValue: -2147483647 source: xref_range_cor_internal_delay_cal_ku scale_factor: 1.0E-6 _ChunkSizes: 500
	/data/ku/pulse_repetition_interval: Array of 32 bit Integers [time = 0..764] time: comment: The 'Pulse Repetition Interval'. PRI is constant within all received pulses in a radar cycle, but it can change within consecutive radar cycles. It is provided in counters of (T0*4) by the altimeter and converted in seconds by the L1 processor, with T0 = 1/altimeter_clock_ku coordinates: longitude latitude long_name: PRI converted into seconds (Ku-band) units: s _FillValue: -2147483647 scale_factor: 1.0E-12 _ChunkSizes: 500
	/data/ku/range_cor_com: Array of 16 bit Integers [time = 0..764] time: comment: It is the (1-way) distance in the z-component between the Centre of Mass and the Antenna reference point coordinates: longitude latitude long_name: Range correction: 1-way distance CoM-antenna (Ku-band) source: xref_center_of_mass units: m _FillValue: -32767 scale_factor: 1.0E-4 _ChunkSizes: 500
	/data/ku/range_cor_doppler: Array of 16 bit Integers [time = 0..764] time: comment: It is the (1-way) Doppler range correction due to satellite altitude rate (applied to LRM (OS) only) coordinates: longitude latitude long_name: Range correction: 1-way Doppler compensation (Ku-band) units: m _FillValue: -32767 scale_factor: 1.0E-4 _ChunkSizes: 500
	/data/ku/range_cor_internal_delay_att: Array of 16 bit Integers [time = 0..764] time: comment: The 1-way range correction due to the delay introduced by the attenuator. The value is computed with a dedicated Attenuator-Calibration and stored in the Delay Attenuator Table coordinates: longitude latitude long_name: Range correction: 1-way range compensation for the delay introduced by the attenuator (Ku-band) source: xref_attenuator_table_ku units: m _FillValue: -32767 scale_factor: 1.0E-4 _ChunkSizes: 500
	/data/ku/range_cor_internal_delay_cal: Array of 16 bit Integers [time = 0..764] time: comment: The internal path delay is periodically measured in flight with a dedicated CAL pulse within the radar cycle or with a dedicated calibration (CAL1). The delay introduced by the attenuator is removed from this variable by the cal L1B processor and added separately by the science L1 processor coordinates: longitude latitude long_name: Range correction: 1-way Internal calibration path delay (from CAL1) (Ku-band) source: xref_range_cor_internal_delay_cal_ku units: m _FillValue: -32767 scale_factor: 1.0E-4 _ChunkSizes: 500
	/data/ku/range_cor_reference_sample: Array of 16 bit Integers [time = 0..764] time: comment: This parameter is computed combining: (N_fs - N_cs + N_L1b), where N_fs [1:20480] is the range window First Sample parameter given in the telemetry, N_cs [1:20480] is the central sample of the matched filter and N_L1B [1:256] is the sample to which the tracker range refers to in the L1B waveform. coordinates: longitude latitude long_name: Range correction: 1-way compensation to shift the tracker range reference to sample [samples/2] counting from 0 (Ku-band) units: m _FillValue: -32767 scale_factor: 1.0E-4 _ChunkSizes: 500
	/data/ku/range_cor_uso: Array of 16 bit Integers [time = 0..764] time: comment: It is the USO Drift (1-way) range correction. The USO drift is applied directly to the clock, this variable has been included for monitoring purpose coordinates: longitude latitude long_name: Range correction: 1-way USO drift (Ku-band) source: xref_doris_uso units: m _FillValue: -32767 scale_factor: 1.0E-5 _ChunkSizes: 500
	/data/ku/sig0_scaling_factor: Array of 16 bit Integers [time = 0..764] time: comment: The scaling factor in order to retrieve sigma-0 from the L1B waveform. It includes the antenna gains and all the geometry factors satellite?surface, according to the radar equation. It is not applied to the L1b waveforms, it has to be applied to the re-tracked value of the (power_waveform*waveform_scale_factor) coordinates: longitude latitude long_name: Power scaling: scaling factor for sigma-0 evaluation (from antenna flange) (Ku-band) units: dB _FillValue: -32767 scale_factor: 0.01 _ChunkSizes: 500
	/data/ku/snr_instr_estimation: Array of 16 bit Integers [time = 0..764] time: comment: Instrument estimated SNR from Telemetry, converted from engineering to physical unit. The SNR is estimated on tracking waveform (N-2). In the L1B HR and L1B-S it is the average of the snr_instr_estimation_140_ku of all the contributing looks within the stack coordinates: longitude latitude long_name: Instrument estimated SNR from Telemetry (Ku-band) units: dB _FillValue: -32767 scale_factor: 0.01 _ChunkSizes: 500
	/data/ku/surface_classification_flag: Array of 8 bit Bytes [time = 0..764] time: _Unsigned: false coordinates: longitude latitude flag_meaning: open_ocean land continental_water aquatic_vegetation continental_ice_snow floating_ice salted_basin long_name: Flag indicating the surface type (Ku-band) source: xref_surface_classification _FillValue: -1 flag_values: 0, 1, 2, 3, 4, 5, 6 valid_range: 0, 6 comment: 7-state surface type classification _ChunkSizes: 500
	/data/ku/telemetry_type_flag: Array of 8 bit Bytes [time = 0..764] time: _Unsigned: false comment: Telemetry packet types: LRM, RAW or RMC. Note: the same L1 product can contain combinations of SAR RAW and RMC packets coordinates: longitude latitude flag_meaning: null_record LRM RAW RMC long_name: Type of ISP (LRM, RAW, RMC) which is input to the L1 record (Ku-band) _FillValue: -1 flag_values: 0, 1, 2, 3 valid_range: 0, 3 _ChunkSizes: 500
	/data/ku/time: Array of 64 bit Reals [time = 0..764] time: calendar: gregorian comment: Time in UTC: it contains the seconds since 1 Jan 2000. Time refers to the instant the L1B waveform (which is a combination of pulses for both LRM and SAR) touches the surface. [tai_utc_difference] is the difference between TAI and UTC reference time (seconds) for the first measurement of the data set. [leap_second] is the UTC time at which a leap second occurs in the data set, if any. After this UTC time, the [tai_utc_difference] is increased by 1 second coordinates: longitude latitude leap_second: 0000-00-00_00:00:00 long_name: Time in UTC: seconds since 1 Jan 2000 (Ku-band) standard_name: time units: seconds since 2000-1-1 0:0:0 tai_utc_difference: 37.0 _ChunkSizes: 500
	/data/ku/time_tai: Array of 64 bit Reals [time = 0..764] time: calendar: gregorian comment: Time in TAI: it contains the seconds since 1 Jan 2000. Time refers to the instant the L1B waveform (which is a combination of pulses for both LRM and SAR) touches the surface. [tai_utc_difference] is the difference between TAI and UTC reference time (seconds) for the first measurement of the data set. [leap_second] is the UTC time at which a leap second occurs in the data set, if any. After this UTC time, the [tai_utc_difference] is increased by 1 second coordinates: longitude latitude leap_second: 0000-00-00_00:00:00 long_name: Time in TAI: seconds since 1 Jan 2000 (Ku-band) standard_name: time units: seconds since 2000-1-1 0:0:0 tai_utc_difference: 37.0 _ChunkSizes: 500
	/data/ku/tm_cor2: Array of 32 bit Integers [time = 0..764] time: comment: The COR2 (altitude rate estimation) value, copied from ISP. The altimeter estimates one COR2 value per radar cycle. It is used in combination with the H0 to compute the CAI and FAI instructions. NOTE: T0 = 1 / altimeter_clock_ku coordinates: longitude latitude long_name: COR2 telemetry (same in 1 radar cycle) (Ku-band) units: T0/16/64 _FillValue: -2147483647 _ChunkSizes: 500
	/data/ku/tm_h0: Array of 32 bit Integers [time = 0..764] time: comment: The H0 (initial altitude instruction) value, copied from ISP. The altimeter provides one H0 value per radar cycle. It is used in combination with the COR2 to compute the CAI and FAI instructions. NOTE: T0 = 1 / altimeter_clock_ku coordinates: longitude latitude long_name: H0 telemetry (same in 1 radar cycle) (Ku-band) units: T0/64 _FillValue: -2147483647 _ChunkSizes: 500
	/data/ku/tm_source_sequence_counter: Array of 16 bit Integers [time = 0..764] time: comment: This is the instrument record counter, copied from ISP coordinates: longitude latitude long_name: Instrument source sequence counter (Ku-band) units: 1 _FillValue: -32767 _ChunkSizes: 500
	/data/ku/tracker_range_calibrated: Array of 32 bit Integers [time = 0..764] time: comment: This is the 1-way distance from the satellite Center of Mass to the middle of the range window (sample samples/2 from 0). It includes the following range calibrations: (a) range_cor_internal_delay_cal, (b) range_cor_internal_delay_att, (c) range_cor_external_group_delay, (d) range_cor_com, (e) range_cor_reference_sample, (f) range_cor_doppler [LRM (OS) only]. Note: the actual altimeter clock (variable 'altimeter_clock_ku') has been used to compute the altimeter range coordinates: longitude latitude long_name: Calibrated 1-way range: CoM to middle range window (at sample samples/2 from 0) (Ku-band) standard_name: altimeter_range units: m _FillValue: -2147483647 scale_factor: 1.0E-4 add_offset: 720000.0 _ChunkSizes: 500
	/data/ku/tracker_range_calibrated_diode: Array of 32 bit Integers [time = 0..764] time: comment: This variable is provided to assess the quality of the onboard DEM and not for scientific use. In open loop tracking mode (OLTC), it is the 1-way distance from the satellite's Center of Mass to the middle of the range window (sample samples/2 from 0) computed from onboard navigation and DEM. In closed loop tracking mode, it is computed but not applied. In SAR, it is the value corresponding to the burst closest to the nadir of the surface location. It includes the following range calibrations: (a) range_cor_internal_delay_cal, (b) range_cor_internal_delay_att, (c) range_cor_external_group_delay, (d) range_cor_com, (e) range_cor_reference_sample, (f) range_cor_doppler [LRM (OS) only]. Note: the actual altimeter clock (variable 'altimeter_clock') has been used to compute the altimeter range coordinates: longitude latitude long_name: Calibrated 1-way range from DIODE: CoM to middle range window (at sample samples/2 from 0) (Ku-band) standard_name: altimeter_range units: m _FillValue: -2147483647 scale_factor: 1.0E-4 add_offset: 720000.0 _ChunkSizes: 500
	/data/ku/variable_digital_gain: Array of 16 bit Integers [time = 0..764] time: comment: The digital gain at the output of each channel (LRM, RAW, RMC) coordinates: longitude latitude long_name: Power scaling: digital variable gain, from telemetry (Ku-band) source: xref_altimeter_level0 units: dB _FillValue: -32767 scale_factor: 0.01 _ChunkSizes: 500
	/data/ku/velocity_vector: Array of 32 bit Integers [time = 0..764][space_3d = 0..2] time: space_3d: comment: Velocity Vector at the centre of mass in ITRF. The 3 components are given according to the 'space_3d' dimension: [1] x, [2] y, [3] z long_name: Velocity vector in ITRF, components: [1] x, [2] y, [3] z (Ku-band) standard_name: platform_speed_wrt_ground _FillValue: -2147483647 scale_factor: 1.0E-4 coordinates: longitude latitude units: m/s _ChunkSizes: 1, 3
	/data/ku/waveform_scale_factor: Array of 32 bit Reals [time = 0..764] time: comment: The L1B waveform scaling factor, computed in order to best fit each waveform within 2 bytes. The scaling, needed to convert the L1B waveform into Watt, is applied as follows: power_waveform_watt(time_20_ku, samples) = power_waveform(time_20_ku, samples) * waveform_scale_factor(time_20_ku) coordinates: longitude latitude long_name: Echo scale factor, to convert from [0-65534] to power at antenna flange (Ku-band) units: W _FillValue: NaN _ChunkSizes: 500
	/data/ku/along_track_coverage: Array of 32 bit Integers [time = 0..764] time: _FillValue: -32767 units: m comment: Spatial coverage in the along-track dimension of the multi-looked waveform. It is computed as the distance, in meters, between the first and last single-look waveforms contributing to the multi-looked waveform. long_name: Waveform along-track coverage (Ku-band) scale_factor: 0.01 _ChunkSizes: 500
	/data/ku/geophysical_correction_ocean: Array of 32 bit Integers [time = 0..764] time: units: m comment: Total Geophysical Correction over Ocean. It includes Ocean tide, Long period equilibrium ocean tide, Ocean loading tide, Solid Earth tide, Geocentric polar tide, Dry tropospheric correction, Wet tropospheric correction, Ionospheric correction, Dynamic atmospheric correction long_name: Total Geophysical Correction over Ocean (Ku-band) scale_factor: 1.0E-6 _FillValue: -32767 _ChunkSizes: 500
	/data/ku/geophysical_correction_land: Array of 32 bit Integers [time = 0..764] time: _FillValue: -32767 units: m comment: Total Geophysical Correction over Land. It includes Ocean loading tide, Solid Earth tide, Geocentric polar tide, Dry tropospheric correction, Wet tropospheric correction, Ionospheric correction long_name: Total Geophysical Correction over Land (Ku-band) scale_factor: 1.0E-6 _ChunkSizes: 500
	/data/ku/geophysical_correction_seaice: Array of 32 bit Integers [time = 0..764] time: units: m comment: Total Geophysical Correction over Sea Ice. It includes Ocean tide, Long period equilibrium ocean tide, Ocean loading tide, Solid Earth tide, Geocentric polar tide, Dry tropospheric correction, Wet tropospheric correction, Ionospheric correction, Inverse barometric correction long_name: Total Geophysical Correction over Sea Ice (Ku-band) scale_factor: 1.0E-6 _FillValue: -32767 _ChunkSizes: 500
	/data/ku/uncorrected_retracked_height: Array of 32 bit Integers [time = 0..764] time: _FillValue: -32767 units: m comment: Surface height by threshold retracker without geophysical corrections applied. The threshold is set to 60%. To obtain the surface height corrected for the geophysical corrections apply the following formula: corrected_retracked_height=/data/ku/uncorrected_retracked_height-/data/ku/geophysical_correction_[surface] where [surface] can be ocean, land or seaice. The geophysical corrections for the three surfaces are provided in the variables /data/ku/geophysical_correction_ocean, /data/ku/geophysical_correction_land, /data/ku/geophysical_correction_seaice. The proper correction can be selected using the surface type specified in variable /data/ku/surface_classification_flag for the corresponding time. See Davis C. H., "A robust threshold retracking algorithm for measuring ice-sheet surface elevation change from satellite radar altimeters," in IEEE Transactions on Geoscience and Remote Sensing, vol. 35, no. 4, pp. 974-979, July 1997, doi: 10.1109/36.602540. long_name: Uncorrected retracked height (Ku-band) scale_factor: 1.0E-6 _ChunkSizes: 500
	/global/ku/antenna_gain: 32 bit Integer /global/ku/antenna_gain comment: Maximum antenna gain, from on-ground characterization long_name: Maximum antenna gain (Ku-band) units: dB scale_factor: 1.0E-6 _FillValue: -2147483647
	/global/ku/burst_phase_array_cor: Array of 32 bit Integers [pulses = 0..63] pulses: comment: Intra-Burst Phase correction to be applied to the SAR Ku waveforms. This is the averaged phase progression of the CAL1 main lobe maximum power range bin along a burst long_name: Intra-Burst phase correction (Ku-band) units: rad _FillValue: -2147483647 scale_factor: 1.0E-6 source: xref_intra_burst_corrections_ku _ChunkSizes: 64
	/global/ku/burst_power_array_cor: Array of 32 bit Integers [pulses = 0..63] pulses: comment: Burst Power correction to be applied to the SAR Ku waveforms. This is the averaged power progression of the CAL1 main lobe maximum power along a burst long_name: Burst power correction (Ku-band) units: dB _FillValue: -2147483647 scale_factor: 1.0E-6 source: xref_intra_burst_corrections_ku _ChunkSizes: 64
	/global/ku/ff_processing_configuration_flags: 8 bit Byte /global/ku/ff_processing_configuration_flags _Unsigned: false comment: It contains the FF processing switches applied to this product. For more details, see ESA L1 Product Format Specification 'JCID-ESA-GP-1005' flag_meaning: range_weighting_applied azimuth_weighting_applied range_antenna_compensation_applied azimuth_antenna_compensation_applied grating_lobe_mitigation_applied _FillValue: -1 flag_masks: 1, 2, 4, 8, 16 valid_range: 0, 31 long_name: Collection of parameters for the FF chain from the processor configuration file (Ku-band)
	/global/ku/focusing_method_flag: 8 bit Byte /global/ku/focusing_method_flag _Unsigned: false comment: Method used for fully focused processing. _FillValue: -1 flag_values: 0, 1 valid_range: 0, 1 long_name: Method used for fully focused processing (Ku-band) flag_meaning: back_projection omega_k
	/global/ku/g_scaling: 32 bit Integer /global/ku/g_scaling comment: Ratio of losses between the RA transmission/reception and the Calibration paths. Defined as (in dB): P_losses_science - P_losses_cal1 - G_ant^2. Value comes from on-ground instrument characterization. _FillValue: -2147483647 scale_factor: 1.0E-6 long_name: Ratio of losses between the RA transmission/reception and the Calibration paths. (Ku-band) units: dB
	/global/ku/integration_time: 64 bit Real /global/ku/integration_time comment: Integration (exposure) time over which the coherent integration is performed to generate single look waveforms. It applies to FF algorithms operating in the time domain. The integration time determines the ground resolution according to the equation: 0.886 * wavelength * satellite_altitude / (2 * satellite_speed *integration_time). long_name: Integration time to focus the single look waveforms (Ku-band) units: s _FillValue: 0.0
	/global/ku/multilooking_method_flag: 8 bit Byte /global/ku/multilooking_method_flag _Unsigned: false flag_values: 0, 1 valid_range: 0, 1 long_name: Method used for the multilooking (Ku-band) flag_meaning: time_domain frequency_domain comment: Method used for multilooking. _FillValue: -1
	/global/ku/posting_rate: 64 bit Real /global/ku/posting_rate comment: The approximate waveform spacing in frequency (Hz). The actual spacing will vary slightly along the orbit depending on orbital and processing parameters. long_name: Waveform spacing in frequency (Ku-band) units: Hz _FillValue: 0.0
	/global/ku/processed_doppler_bandwidth: 64 bit Real /global/ku/processed_doppler_bandwidth comment: Doppler bandwidth that is processed to generate the single look waveforms. It applies to FF algorithms operating in the frequency domain. _FillValue: 0.0 long_name: Doppler bandwidth used to focus the single look waveforms. (Ku-band) units: Hz
	/global/ku/processing_configuration_flags: 8 bit Byte /global/ku/processing_configuration_flags _Unsigned: false comment: It contains the processing switches applied to this product. For more details, see ESA L1 Product Format Specification 'JC-ID-ESA-GP-0174' long_name: Collection of parameters from the processor configuration file (Ku-band) _FillValue: -1 flag_masks: 1, 2, 4, 8, 16 valid_range: 0, 31 flag_meaning: uso_correction_activated cal1_correction_activated cal1_power_cor_max cal2_correction_activated cal1_delay_cor_max
	/global/ku/range_cor_external_group_delay: 32 bit Integer /global/ku/range_cor_external_group_delay comment: The absolute 1-way group delay contribution for parts outside the calibration loop long_name: Range correction: 1-way external group delay from ground characterisation (Ku-band) units: m _FillValue: -2147483647 scale_factor: 1.0E-4
	/global/ku/range_oversampling_factor: 16 bit Integer /global/ku/range_oversampling_factor comment: The instrument samples the waveforms with a 395 MHz clock, providing a nominal_sampling = c / 395e6 / 2 = ~0.379m (with c = speed of light). In addition, the ground processor can apply an oversampling factor, providing a waveform_sampling = nominal_sampling / range_oversampling_factor. Note that the altimeter range resolution is fixed and given by the chirp bandwidth of 320 MHz: c / 320e6 / 2 = ~0.468m units: 1 _FillValue: -32767 long_name: Oversampling factor applied in the range compression (FFT) (Ku-band)
	/global/ku/residual_fixed_digital_gain_raw: 32 bit Integer /global/ku/residual_fixed_digital_gain_raw comment: The SAR RAW channel is subject to a specific on-board digital processing that affects the signal scaling such as ADC, FFTs and the range compression gain. This is calibrated directly using the CAL1 max/total power and does not need further characterization. This variable contains the (potential) residual gain to be applied to the SAR RAW waveform long_name: Residual on-board fixed digital processing gain for SAR RAW (Ku-band) units: dB _FillValue: -2147483647 scale_factor: 1.0E-6
	/global/ku/residual_fixed_digital_gain_rmc: 32 bit Integer /global/ku/residual_fixed_digital_gain_rmc comment: The SAR RMC channel is subject to a specific on-board digital processing that affects the signal scaling such as ADC, FFTs and the range compression gain. This is calibrated directly using the CAL1 max/total power and does not need further characterization. This variable contains the residual gain to be applied to the SAR RMC waveform long_name: Residual on-board fixed digital processing gain for RMC (Ku-band) units: dB _FillValue: -2147483647 scale_factor: 1.0E-6

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DDS:

Dataset {
    Byte space_3d[space_3d = 3];
    Byte pulses[pulses = 64];
    Int16 samples[samples = 256];
    Int32 /data/ku/altimeter_clock[time = 765];
    Int32 /data/ku/altitude[time = 765];
    Int32 /data/ku/altitude_rate[time = 765];
    Int16 /data/ku/attenuator_calibrated[time = 765];
    Int16 /data/ku/cal1_power[time = 765];
    Byte /data/ku/ff_mcd_flags[time = 765];
    UInt32 /data/ku/hn_mean[time = 765];
    Int32 /data/ku/l1b_record_counter[time = 765];
    Int32 /data/ku/latitude[time = 765];
    Int32 /data/ku/longitude[time = 765];
    Byte /data/ku/manoeuvre_flag[time = 765];
    Int16 /data/ku/mcd_flags[time = 765];
    Int16 /data/ku/num_single_looks[time = 765];
    Int32 /data/ku/off_nadir_pitch_angle_pf[time = 765];
    Int32 /data/ku/off_nadir_roll_angle_pf[time = 765];
    Int32 /data/ku/off_nadir_yaw_angle_pf[time = 765];
    Byte /data/ku/p4_instrument_configuration_flags[time = 765];
    Byte /data/ku/p4_mode_flag[time = 765];
    Int16 /data/ku/pnr_estimation[time = 765];
    Float64 /data/ku/position_vector[time = 765][space_3d = 3];
    Int16 /data/ku/power_scaling_to_antenna[time = 765];
    UInt16 /data/ku/power_waveform[time = 765][samples = 256];
    Int32 /data/ku/ptr_main_lobe_width[time = 765];
    Int32 /data/ku/pulse_repetition_interval[time = 765];
    Int16 /data/ku/range_cor_com[time = 765];
    Int16 /data/ku/range_cor_doppler[time = 765];
    Int16 /data/ku/range_cor_internal_delay_att[time = 765];
    Int16 /data/ku/range_cor_internal_delay_cal[time = 765];
    Int16 /data/ku/range_cor_reference_sample[time = 765];
    Int16 /data/ku/range_cor_uso[time = 765];
    Int16 /data/ku/sig0_scaling_factor[time = 765];
    Int16 /data/ku/snr_instr_estimation[time = 765];
    Byte /data/ku/surface_classification_flag[time = 765];
    Byte /data/ku/telemetry_type_flag[time = 765];
    Float64 /data/ku/time[time = 765];
    Float64 /data/ku/time_tai[time = 765];
    Int32 /data/ku/tm_cor2[time = 765];
    Int32 /data/ku/tm_h0[time = 765];
    Int16 /data/ku/tm_source_sequence_counter[time = 765];
    Int32 /data/ku/tracker_range_calibrated[time = 765];
    Int32 /data/ku/tracker_range_calibrated_diode[time = 765];
    Int16 /data/ku/variable_digital_gain[time = 765];
    Int32 /data/ku/velocity_vector[time = 765][space_3d = 3];
    Float32 /data/ku/waveform_scale_factor[time = 765];
    Int32 /data/ku/along_track_coverage[time = 765];
    Int32 /data/ku/geophysical_correction_ocean[time = 765];
    Int32 /data/ku/geophysical_correction_land[time = 765];
    Int32 /data/ku/geophysical_correction_seaice[time = 765];
    Int32 /data/ku/uncorrected_retracked_height[time = 765];
    Int32 /global/ku/antenna_gain;
    Int32 /global/ku/burst_phase_array_cor[pulses = 64];
    Int32 /global/ku/burst_power_array_cor[pulses = 64];
    Byte /global/ku/ff_processing_configuration_flags;
    Byte /global/ku/focusing_method_flag;
    Int32 /global/ku/g_scaling;
    Float64 /global/ku/integration_time;
    Byte /global/ku/multilooking_method_flag;
    Float64 /global/ku/posting_rate;
    Float64 /global/ku/processed_doppler_bandwidth;
    Byte /global/ku/processing_configuration_flags;
    Int32 /global/ku/range_cor_external_group_delay;
    Int16 /global/ku/range_oversampling_factor;
    Int32 /global/ku/residual_fixed_digital_gain_raw;
    Int32 /global/ku/residual_fixed_digital_gain_rmc;
} data2/fig/17198435/1/ds03a.nc;

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