CYGNSS Level 1 Science Data Record Version 3.1
(CYGNSS_L1_V3.1)
5 Publications Cited this Dataset
Citation metrics available for years (2014-2022)
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Publications citing CYGNSS Level 1 Science Data Record Version 3.1
Citation metrics available for years (2014-2022)
| Year | Citation |
|---|---|
| 2022 | A Probabilistic Approach to Mapping Inland Water Bodies with GNSS-R, IEEE International Geoscience and Remote Sensing Symposium ,10.1109/IGARSS46834.2022.9883515 |
| 2022 | GNSS-R Soil Moisture Retrieval for Flat Vegetated Surfaces Using a Physics-Based Bistatic Scattering Model and Hybrid Global/Local Optimization, Remote Sensing ,10.3390/rs14133129 |
| 2022 | Intercomparison of electromagnetic scattering models for delay-Doppler maps along a CYGNSS land track with topography, IEEE Transactions on Geoscience and Remote Sensing ,10.1109/TGRS.2022.3210160 |
| 2022 | Significant Wave Height Retrieval Based on Multivariable Regression Models Developed With CYGNSS Data, IEEE Transactions on Geoscience and Remote Sensing ,10.1109/TGRS.2022.3233102 |
| 2022 | Spaceborne GNSS-R wind speed retrieval using machine learning methods, Remote Sensing ,10.3390/rs14143507 |
| Version | 3.1 |
| Processing Level | 1 |
| Start/Stop Date | 2018-Aug-01 to Present |
| Short Name | CYGNSS_L1_V3.1 |
| Description | This Level 1 (L1) dataset contains the Version 3.1 geo-located Delay Doppler Maps (DDMs) calibrated into Power Received (Watts) and Bistatic Radar Cross Section (BRCS) expressed in units of m2 from the Delay Doppler Mapping Instrument aboard the CYGNSS satellite constellation. This version supersedes Version 3.0; https://doi.org/10.5067/CYGNS-L1X30. Other useful scientific and engineering measurement parameters include the DDM of Normalized Bistatic Radar Cross Section (NBRCS), the Delay Doppler Map Average (DDMA) of the NBRCS near the specular reflection point, and the Leading Edge Slope (LES) of the integrated delay waveform. The L1 dataset contains a number of other engineering and science measurement parameters, including sets of quality flags/indicators, error estimates, and bias estimates as well as a variety of orbital, spacecraft/sensor health, timekeeping, and geolocation parameters. At most, 8 netCDF data files (each file corresponding to a unique spacecraft in the CYGNSS constellation) are provided each day; under nominal conditions, there are typically 6-8 spacecraft retrieving data each day, but this can be maximized to 8 spacecraft under special circumstances in which higher than normal retrieval frequency is needed (i.e., during tropical storms and or hurricanes). Latency is approximately 6 days (or better) from the last recorded measurement time. Here is a summary of improvements the calibration and processing changes to the Version 3.1 data: The CYGNSS science antenna gain patterns have been adjusted to improve the accuracy of the ocean surface scattering cross section (a.k.a. the NBRCS) calibration. They are adjusted so that the annual average observed NBRCS matches the model-predicted average as derived from Wavewatch-3 estimates of the surface roughness with the appropriate spectral tail extension added to the roughness spectrum. The adjustment is made independently at each position in the science antenna pattern. A correction for coarse quantization effects by the on-board digital processor has also been added. This reduces the effects of radio frequency interference, which appeared as calibration biases in the v3.0 L1 NBRCS and retrieval biases in the v3.0 L2 wind speed that were persistent at certain locations. |
| DOI | 10.5067/CYGNS-L1X31 |
| Measurement | SPECTRAL/ENGINEERING > RADAR > RADAR CROSS-SECTION SPECTRAL/ENGINEERING > RADAR > RADAR REFLECTIVITY |
| Swath Width | 25 km |
| Platform/Sensor | CYGNSS / Platform Name: Cyclone Global Navigation Satellite System (CYGNSS) Inclination Angle: 35.0 degrees Orbit Period: 94.0 minutes DDMI SENSOR Name: Delay Doppler Mapping Instrument (DDMI) Swath Width: 25.0 kilometers Description: Spacecraft angular distance from orbital plane relative to the Equator. |
| Project | Cyclone Global Navigation Satellite System (CYGNSS) |
| Data Provider | Publisher: PO.DAAC Creator: CYGNSS Release Place: PO.DAAC Release Date: 2021-Dec-17 Resource: https://cygnss.engin.umich.edu/ |
| Format | netCDF-4 |
| Keyword(s) | cygnss, ddm, ddmi, ddma, doppler, delay doppler, delay, specular point, waveform, les, leading edge slope, bistatic, bi-static, radar, brcs, sigma0, sigma-0, sigma naught, sigma-naught, nbrcs, wind, winds, wind speed, version 3.1, v3.1 |
Questions related to this dataset? Contact podaac@podaac.jpl.nasa.gov
Resolution Spatial Resolution: 25000 Meters x 25000 Meters Temporal Resolution: Hourly - < Daily Coverage North Bounding Coordinate: 40 degrees South Bounding Coordinate: -40 degrees West Bounding Coordinate: -180 degrees East Bounding Coordinate: 180 degrees Time Span: 2018-Aug-01 to PresentSwath Width: 25 km Projection Projection Type: Satellite native along-track Projection Detail: Geolocation information included for each pixel Ellipsoid: WGS 84 |
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| This dataset can be downloaded using the podaac-data-subscriber (the recommended tool for bulk downloading PO.DAAC data). It is a Python package for downloading one or many files using the command line interface. The URL redirects to the data-subscriber home page with instructions for utilizing the tool | |
| DIRECT S3-ACCESS | |
| Available for access in-region with AWS Cloud | |
Region | |
| us-west-2 | |
| podaac-ops-cumulus-protected/CYGNSS_L1_V3.1 | |
| podaac-ops-cumulus-public/CYGNSS_L1_V3.1 | |
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| Name | Long Name | Unit |
|---|---|---|
| add_range_to_sp | Additional range to specular point at DDM sample time | 1 |
| add_range_to_sp_pvt | Additional range to specular point at PVT time | 1 |
| att_timestamp_gps_sec | Attitude timestamp - GPS Seconds | second |
| att_timestamp_gps_week | Attitude timestamp - GPS Week | week |
| att_timestamp_utc | Attitude timestamp - UTC | seconds since 2021-01-01 00:00:00.499261646 |
| bb_nearest | Time to most recent black body reading | second |
| bb_power_temperature_density | Black Body Power Temperature Density | Counts/Kelvin |
| bit_null_offset_port | Port bit count null offset | 1 |
| bit_null_offset_starboard | Starboard bit count null offset | 1 |
| bit_null_offset_zenith | Zenith bit count null offset | 1 |
| bit_ratio_lo_hi_port | Port low/high bit counter ratio | 1 |
| bit_ratio_lo_hi_starboard | Starboard low/high bit counter ratio | 1 |
| bit_ratio_lo_hi_zenith | Zenith low/high bit counter ratio | 1 |
| brcs | DDM bin bistatic radar cross section | meter2 |
| brcs_ddm_peak_bin_delay_row | BRCS DDM peak bin delay row | 1 |
| brcs_ddm_peak_bin_dopp_col | BRCS DDM peak bin Doppler column | 1 |
| brcs_ddm_sp_bin_delay_row | BRCS DDM specular point bin delay row | 1 |
| brcs_ddm_sp_bin_dopp_col | BRCS DDM specular point bin Doppler column | 1 |
| commanded_sc_roll | Commanded spacecraft attitude roll angle | radian |
| ddm | DDM reflectometry channel | 1 |
| ddm_ant | DDM Antenna | |
| ddm_brcs_uncert | DDM BRCS uncertainty | 1 |
| ddm_end_time_offset | DDM end time offset | 1e-9 s |
| ddm_kurtosis | DDM kurtosis | 1 |
| ddm_les | Leading edge slope | 1 |
| ddm_nbrcs | Normalized BRCS | 1 |
| ddm_noise_floor | DDM noise floor | 1 |
| ddm_noise_floor_corrected | DDM noise floor corrected | 1 |
| ddm_snr | DDM signal to noise ratio | dB |
| ddm_source | Level 0 data source | |
| ddm_time_type_selector | DDM sample time type selector | |
| ddm_timestamp_gps_sec | DDM sample timestamp - GPS Seconds | second |
| ddm_timestamp_gps_week | DDM sample timestamp - GPS Week | week |
| ddm_timestamp_utc | DDM sample timestamp - UTC | seconds since 2021-01-01 00:00:00.499261646 |
| delay_resolution | DDM delay bin resolution | 1 |
| dopp_resolution | DDM Doppler bin resolution | s-1 |
| eff_scatter | DDM bin effective scattering area | meter2 |
| fresnel_coeff | Fresnel power reflection coefficient at specular point | 1 |
| fsw_comp_delay_shift | Flight software DDM compression delay shift | 1 |
| fsw_comp_dopp_shift | Flight software DDM compression Doppler shift | s-1 |
| gps_ant_gain_db_i | GPS SV transmit antenna gain | dBi |
| gps_eirp | GPS effective isotropic radiated power | watt |
| gps_off_boresight_angle_deg | GPS off boresight angle | degree |
| gps_tx_power_db_w | GPS SV transmit power | dBW |
| inst_gain | Instrument gain | 1 |
| les_scatter_area | LES scattering area | meter2 |
| lna_noise_figure | LNA noise figure | dB |
| lna_temp_nadir_port | Port Antenna LNA temperature | degree_Celsius |
| lna_temp_nadir_starboard | Starboard antenna LNA temperature | degree_Celsius |
| lna_temp_zenith | Zenith Antenna LNA temperature | degree_Celsius |
| nbrcs_scatter_area | NBRCS scattering area | meter2 |
| noise_correction | DDM noise floor correction factor | 1 |
| nst_att_status | NST attitude status | |
| port_gain_setting | The Nadir-Port Gain Setting | dB |
| power_analog | DDM bin analog power | watt |
| prn_code | GPS PRN code | 1 |
| prn_fig_of_merit | PRN selection figure of Merit | 1 |
| pvt_timestamp_gps_sec | PVT timestamp - GPS Seconds | second |
| pvt_timestamp_gps_week | PVT timestamp - GPS Week | week |
| pvt_timestamp_utc | PVT timestamp - UTC | seconds since 2021-01-01 00:00:00.499261646 |
| quality_flags | Per-DDM quality flags 1 | |
| quality_flags_2 | Per-DDM quality flags 2 | |
| raw_counts | DDM bin raw counts | 1 |
| rx_clk_bias | GPS receiver clock bias | meter |
| rx_clk_bias_pvt | GPS receiver clock bias at PVT time | meter |
| rx_clk_bias_rate | GPS receiver clock bias rate | meter s-1 |
| rx_clk_bias_rate_pvt | GPS receiver clock bias rate at PVT time | meter s-1 |
| rx_to_sp_range | Rx to specular point range | meter |
| sample | Sample index | 1 |
| sc_alt | Spacecraft altitude | meter |
| sc_lat | Sub-satellite point latitude | degrees_north |
| sc_lon | Sub-satellite point longitude | degrees_east |
| sc_pitch | Spacecraft attitude pitch angle at DDM sample time | radian |
| sc_pitch_att | Spacecraft attitude pitch angle at attitude time | radian |
| sc_pos_x | Spacecraft position X at DDM sample time | meter |
| sc_pos_x_pvt | Spacecraft position X at PVT time | meter |
| sc_pos_y | Spacecraft position Y at DDM sample time | meter |
| sc_pos_y_pvt | Spacecraft position Y at PVT time | meter |
| sc_pos_z | Spacecraft position Z at DDM sample time | meter |
| sc_pos_z_pvt | Spacecraft position Z at PVT time | meter |
| sc_roll | Spacecraft attitude roll angle at DDM sample time | radian |
| sc_roll_att | Spacecraft attitude roll angle at attitude time | radian |
| sc_vel_x | Spacecraft velocity X at DDM sample time | meter s-1 |
| sc_vel_x_pvt | Spacecraft velocity X at PVT time | meter s-1 |
| sc_vel_y | Spacecraft velocity Y at DDM sample time | meter s-1 |
| sc_vel_y_pvt | Spacecraft velocity Y at PVT time | meter s-1 |
| sc_vel_z | Spacecraft velocity Z at DDM sample time | meter s-1 |
| sc_vel_z_pvt | Spacecraft velocity Z at PVT time | meter s-1 |
| sc_yaw | Spacecraft attitude yaw angle at DDM sample time | radian |
| sc_yaw_att | Spacecraft attitude yaw angle at attitude time | radian |
| sp_alt | Specular point altitude | meter |
| sp_az_body | Specular point body frame azimuth angle | degree |
| sp_az_orbit | Specular point orbit frame azimuth angle | degree |
| sp_ddmi_delay_correction | Correction to DDMI specular point delay | 1 |
| sp_ddmi_dopp | DDMI Doppler at specular point | s-1 |
| sp_ddmi_dopp_correction | Correction to DDMI specular point Doppler | s-1 |
| sp_delay_error | Flight software specular point delay error | 1 |
| sp_dopp_error | Flight software specular point Doppler error | s-1 |
| sp_fsw_delay | Flight software specular point delay | 1 |
| sp_inc_angle | Specular point incidence angle | degree |
| sp_lat | Specular point latitude | degrees_north |
| sp_lon | Specular point longitude | degrees_east |
| sp_pos_x | Specular point position X | meter |
| sp_pos_y | Specular point position Y | meter |
| sp_pos_z | Specular point position Z | meter |
| sp_rx_gain | Specular point Rx antenna gain | dBi |
| sp_theta_body | Specular point body frame theta angle | degree |
| sp_theta_orbit | Specular point orbit frame theta angle | degree |
| sp_vel_x | Specular point velocity X | meter s-1 |
| sp_vel_y | Specular point velocity Y | meter s-1 |
| sp_vel_z | Specular point velocity Z | meter s-1 |
| spacecraft_id | CCSDS spacecraft identifier | 1 |
| spacecraft_num | CYGNSS spacecraft number | 1 |
| starboard_gain_setting | The Nadir-Starboard Gain Setting | dB |
| static_gps_eirp | Static GPS effective isotropic radiated power | watt |
| status_flags_one_hz | 1 Hz Status Flags | |
| sv_num | GPS Space Vehicle Number | 1 |
| track_id | DDM Track ID | 1 |
| tx_clk_bias | GPS transmitter clock bias | meter |
| tx_pos_x | GPS Tx position X | meter |
| tx_pos_y | GPS Tx position Y | meter |
| tx_pos_z | GPS Tx position Z | meter |
| tx_to_sp_range | Tx to specular point range | meter |
| tx_vel_x | GPS Tx velocity X | meter s-1 |
| tx_vel_y | GPS Tx velocity Y | meter s-1 |
| tx_vel_z | GPS Tx velocity Z | meter s-1 |
| zenith_code_phase | Zenith signal code phase | 1 |
| zenith_sig_i2q2 | Zenith Signal I2Q2 | 1 |
| zenith_sig_i2q2_add_correction | Zenith Signal I2 Q2 additive correction factor | 1 |
| zenith_sig_i2q2_corrected | Zenith Signal I2Q2 Corrected | 1 |
| zenith_sig_i2q2_mult_correction | Zenith Signal I2Q2 Multiplicative Correction Factor | 1 |
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Citation is critically important for dataset documentation and discovery. Please cite the data as follows, and cite the reference papers when it is appropriate.
| Citation | CYGNSS. 2021. CYGNSS Level 1 Science Data Record Version 3.1. Ver. 3.1. PO.DAAC, CA, USA. Dataset accessed [YYYY-MM-DD] at https://doi.org/10.5067/CYGNS-L1X31
For more information see Data Citations and Acknowledgments.
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| Journal Reference | Ruf, C., S. Asharaf, R. Balasubramaniam, S. Gleason, T. Lang, D. McKague, D. Twigg, and D. Waliser. 2019. In-Orbit Performance of the Constellation of CYGNSS Hurricane Satellites., Bulletin of the American Meteorological Society, 100, 10. Gleason, S., M. M. Al-Khaldi, C. Ruf, D. S. McKague, T. Wang, A. Russel . 2021. Characterizing and Mitigating Digital Sampling Effects on the CYGNSS Level 1 Calibration, IEEE Trans. Geosci. Remote Sens. 10.1109/TGRS.2021.3120026 Pascual, D., M. P. Clarizia, C. S. Ruf . 2021. Improved CYGNSS Wind Speed Retrieval Using Significant Wave Height Correction, Remote Sensing. 10.3390/rs13214313 Wang, T., Ruf, C. S., Gleason, S., O'Brien, A. J., McKague, D. S., Block, B. P., Russel, A.. 2021. Dynamic Calibration of GPS Effective Isotropic Radiated Power for GNSS-Reflectometry Earth Remote Sensing, IEEE Trans. Geosci. Remote Sens.. https://doi.org//10.1109/TGRS.2021.3070238 |
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