S-MODE DopplerScatt Level 1 Surface Doppler and Radar Backscatter Version 1
(SMODE_L1_DOPPLERSCATT_V1)| Version | 1 |
| Processing Level | 1 |
| Start/Stop Date | 2021-May-03 to 2023-Apr-30 |
| Short Name | SMODE_L1_DOPPLERSCATT_V1 |
| Description | This dataset contains concurrent airborne DopplerScatt radar retrievals of surface vector winds and ocean currents from the Sub-Mesoscale Ocean Dynamics Experiment (S-MODE) during a pilot campaign conducted approximately 300 km offshore of San Francisco over two weeks in October 2021. S-MODE aims to understand how ocean dynamics acting on short spatial scales influence the vertical exchange of physical and biological variables in the ocean. DopplerScatt is a Ka-band (35.75 GHz) scatterometer with a swath width of 24 km that records Doppler measurements of the relative velocity between the platform and the surface. It is mounted on a B200 aircraft which flies daily surveys of the field domain during deployments, and data is used to give larger scale context, and also to compare with in-situ measurements of velocities and divergence. Level 1 data includes geolocated physical measurements for a measurement footprint, which are the basis for the DopplerScatt L2 surface winds and currents estimates. Data are available in netCDF format and are ordered by measurement acquisition time and radar range, and are not on a geospatial grid. |
| DOI | 10.5067/SMODE-DSCT1 |
| Measurement | SPECTRAL/ENGINEERING > RADAR > DOPPLER VELOCITY SPECTRAL/ENGINEERING > RADAR > RADAR BACKSCATTER |
| Platform/Sensor | B-200 / Platform Name: Beechcraft King Air B-200 (B-200) SCATTEROMETERS SENSOR Name: SCATTEROMETERS (SCATTEROMETERS) |
| Project | Sub-Mesoscale Ocean Dynamics Experiment (S-MODE) |
| Data Provider | Publisher: S-MODE Project Data Manager, Fred Bingham Creator: Ernesto Rodriguez Release Date: 2022-Nov-29 Resource: http://podaac.jpl.nasa.gov/S-MODE |
| Format | netCDF-4 |
| Keyword(s) | S-MODE, Sub-Mesoscale Ocean Dynamics Experiment, earth science, atmosphere, atmospheric winds, surface winds, oceans, ocean circulation, spectral/engineering, radar, doppler velocity, airborne, dopplerscatt, scatterometer |
Questions related to this dataset? Contact podaac@podaac.jpl.nasa.gov
Resolution Temporal Resolution: 1 second - < 1 minute Coverage North Bounding Coordinate: 38.1 degrees South Bounding Coordinate: 36.3 degrees West Bounding Coordinate: -125.4 degrees East Bounding Coordinate: -122.5 degrees Time Span: 2021-May-03 to 2023-Apr-30 Projection Projection Type: Universal Transverse Mercator (UTM) 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 | |
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| us-west-2 | |
| podaac-ops-cumulus-protected/SMODE_L1_DOPPLERSCATT_V1/ | |
| podaac-ops-cumulus-public/SMODE_L1_DOPPLERSCATT_V1/ | |
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| Name | Long Name | Unit |
|---|---|---|
| antenna_boresight_unit_vector_east_component | East component of antenna boresight look unit vector in East-North-Up (ENU) coordinates. | |
| antenna_boresight_unit_vector_north_component | North component of antenna boresight look unit vector in East-North-Up (ENU) coordinates. | |
| antenna_boresight_unit_vector_up_component | Up component of antenna boresight look unit vector in East-North-Up (ENU) coordinates. | |
| antenna_encoder_angle | Angular position of the rotating antenna, in radians, recorded by the rotary encoder. Measured counter-clockwise positive from the right-looking broadside direction. | rad |
| azimuth_angle_offset | Offset applied to estimated azimuth angle, in radians. | rad |
| bandwidth | Range frequency bandwidth, in hertz. | s-1 |
| burst_repetition_interval | Burst repetition interval (BRI), in seconds. | s |
| calpulse_mean_power | Nominal (estimated) mean power in a 6us calibration pulse (linear scale). | |
| calpulse_pulsecompress_peak_delay | Temporal position of the pulse-compressed calibration pulse peak sample, in seconds relative to the start of the range sampling window. | s |
| calpulse_pulsecompress_peak_phase | Phase, in radians, of the pulse-compressed calibration pulse peak sample. | rad |
| calpulse_pulsecompress_peak_power | Power (linear scale) of the pulse-compressed calibration pulse peak sample. | |
| correlation_coefficient | Interferometric correlation coefficient of each computed pulse-pair interferogram. | |
| derivative_of_platform_radial_velocity_wrt_azimuth_angle | Rate of change of the radial component of platform velocity with respect to azimuth angle, in meters per second per radian. | m s-1 rad-1 |
| distance_from_coast | Minimum distance from coast, in kilometers. A negative value indicates that the observation point was inland. | km |
| dn_to_milliwatts_conversion_factor | Scale factor applied to raw I/Q samples to convert from digital numbers to milliwatts. | |
| eastward_platform_velocity | East component of platform velocity vector in East-North-Up (ENU) coordinates, in meters per second. | m s-1 |
| far_range_noise_power | Average multilooked power (linear scale) of noise samples on the far side of the swath, in watts. | W |
| height | Sea surface height above reference ellipsoid, in meters. | m |
| interpulse_period | Inter-pulse period (IPP), in seconds. Interval between successive pulses within a burst. | s |
| latitude | Geodetic latitude of the observation point, in degrees. | degree_north |
| line_of_sight_unit_vector_east_component | East component of platform-to-target line-of-sight unit vector in East-North-Up (ENU) coordinates. | |
| line_of_sight_unit_vector_north_component | North component of platform-to-target line-of-sight unit vector in East-North-Up (ENU) coordinates. | |
| line_of_sight_unit_vector_up_component | Up component of platform-to-target line-of-sight unit vector in East-North-Up (ENU) coordinates. | |
| longitude | Geodetic longitude of the observation point, in degrees. | degree_east |
| low_correlation_mask | Indicates pixels with interferometric correlation coefficient below a specified threshold. (0 = good correlation, 2 = low correlation) | |
| low_correlation_threshold | Correlation coefficient threshold for detecting low correlation data. | |
| mean_noise_power | Average power of noise samples, in watts (linear scale). | W |
| milliwatts_adc_to_watts_conversion_factor | Scale factor applied to multilooked power data to convert from milliwatts to watts and remove system gain. | |
| near_range_noise_power | Average multilooked power (linear scale) of noise samples on the near side of the swath, in watts. | W |
| noise_estimation_buffer_samples | Number of buffer samples excluded from the noise region (on either side of the signal data region) when classifying return samples as either signal or noise for SNR estimation. | |
| normalized_radar_cross_section | Normalized radar cross-section (sigma naught). | |
| normalized_radar_cross_section_variance | Estimated variance of normalized radar cross-section (sigma naught). | |
| normalized_standard_deviation_of_return_energy | Normalized standard deviation of backscatter energy (Kp coefficient). | |
| northward_platform_velocity | North component of platform velocity vector in East-North-Up (ENU) coordinates, in meters per second. | m s-1 |
| number_of_looks | Azimuth multilook window size, in pixels. | |
| off_boresight_angle | Angle between the boresight look vector and the platform-to-target line-of-sight vector, in radians. | rad |
| platform_altitude | Platform altitude above reference ellipsoid, in meters. | m |
| platform_azimuth_angle | Platform-to-target azimuth angle, in radians, measured clockwise from geographic north. | rad |
| platform_heading_angle | Platform heading angle, in radians, measured clockwise positive from geographic north. | rad |
| platform_latitude | Platform geodetic latitude, in degrees. | degree_north |
| platform_longitude | Platform geodetic longitude, in degrees. | degree_east |
| platform_look_angle | Platform-to-target look angle, in radians. This is the angle between the line-of-sight vector and the platform nadir vector (normal to the ellipsoid surface). | rad |
| platform_pitch_angle | Platform pitch angle, in radians. | rad |
| platform_radial_velocity | Radial component of platform velocity, in meters per second. | m s-1 |
| platform_roll_angle | Platform roll angle, in radians. | rad |
| platform_yaw_angle | Platform yaw angle, in radians. | rad |
| power | Multilooked power (linear scale), in watts. | W |
| processing_beamwidth | Nominal processing beamwidth, in degrees. Used to determine the range and azimuth extents of the swath. This is not necessarily the same as the antenna -3dB beamwidth. | degree |
| pulse_compression_gain | White noise gain (WNG) due to pulse compression (linear scale). Incorporates losses due to processing window effects. | |
| pulse_compression_normalization_factor | Scale factor applied to pulse-compressed data to normalize to unit white noise gain (WNG). | |
| pulse_pair_azimuth_angle_separation | Estimated (signed) azimuth angle separation between each interferometric pulse-pair, in radians. | rad |
| pulse_pair_azimuth_angle_separation_standard_error | Standard error of estimated azimuth angular separation between each interferometric pulse-pair, in radians. | rad |
| pulse_pair_burst_separation | Number of burst intervals between each interferometric pulse-pair. | |
| pulse_pair_radial_sea_water_velocity_away_from_instrument | Estimated radial component of sea surface velocity, in meters per second, for each computed pulse-pair interferogram. | m s-1 |
| pulse_pair_radial_sea_water_velocity_away_from_instrument_standard_deviation | Sample standard deviation of multilooked radial velocity estimates, in meters per second, for each computed pulse-pair interferogram. Approximated from interferometric correlation coefficient using a simple model. | m s-1 |
| pulse_pair_temporal_separation | Interferometric pulse-pair temporal separation, in seconds. | s |
| pulse_width | Transmitted pulse duration, in seconds. | s |
| radial_sea_water_velocity_away_from_instrument | Estimated radial component of sea surface velocity, in meters per second. If more than one pulse-pair interferogram was computed, this represents an inverse-variance-weighted average of the individual estimates. | m s-1 |
| radial_sea_water_velocity_away_from_instrument_standard_deviation | Sample standard deviation of multilooked radial velocity estimates, in meters per second. Approximated from interferometric correlation coefficient using a simple model. | m s-1 |
| range_window_start_index | Range bin index of the first valid return sample within the range sampling window. Preceding samples contain loop-back calibration data. | |
| sampling_rate | Range sampling rate, in hertz. | s-1 |
| signal_region_far_edge_index | Slant range index of the far edge of the estimated signal data region. | |
| signal_region_near_edge_index | Slant range index of the near edge of the estimated signal data region. | |
| signal_to_noise_ratio | Signal power to noise power ratio (SNR) (linear scale). | |
| slant_range | Slant range distance, in meters. | m |
| time | Sensor acquisition time, in seconds since 1950-01-01T00:00:00Z | seconds since 1950-01-01T00:00:00Z |
| upward_platform_velocity | Up component of platform velocity vector in East-North-Up (ENU) coordinates, in meters per second. | m s-1 |
| wavelength | Radar central wavelength, in meters. | m |
| xfactor | Conversion factor relating absolute received power, in watts, to normalized radar cross-section (sigma naught). |
| DATA CITATION GUIDELINES | |
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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 | Ernesto Rodriguez. 2022. S-MODE DopplerScatt Level 1 Surface Doppler and Radar Backscatter Version 1. Ver. 1. PO.DAAC, CA, USA. Dataset accessed [YYYY-MM-DD] at https://doi.org/10.5067/SMODE-DSCT1
For more information see Data Citations and Acknowledgments.
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