Attributes {
/Spacecraft_Data/along_track_time {
String long_name "J2000 time when spacecraft passed over midpoint of the along track grid cell row along the nadir path.";
String units "seconds";
}
/Spacecraft_Data/sc_nadir_lat {
String long_name "Spacecraft latitude at midpoint of the grid cell row along nadir track";
String units "degrees_north";
String coordinates "along_track_time";
Float32 valid_min -90.;
Float32 valid_max 90.;
Float32 _FillValue -9999.;
}
/Spacecraft_Data/along_track_time_utc {
String long_name "UTC time stamp when spacecraft passed over midpoint of the along track grid cell row along the nadir path.";
String coordinates "along_track_time";
}
/Spacecraft_Data/sc_geodetic_alt_ellipsoid {
String long_name "Spacecraft altitude above Earth WGS84 reference ellipsoid along the nadir track.";
String units "meters";
String coordinates "along_track_time";
Float32 valid_min 700000.;
Float32 valid_max 900000.;
Float32 _FillValue -9999.;
}
/Spacecraft_Data/z_vel {
String units "meters/second";
String coordinates "along_track_time";
String long_name "SC velocity in z direction of Earth Centered Rotating coordinate system interpolated to time spacecraft passed over midpoint of grid cell row along the nadir track";
Float32 valid_min -8000.;
Float32 valid_max 8000.;
Float32 _FillValue -9999.;
}
/Spacecraft_Data/pitch {
String long_name "SC pitch interpolated to time spacecraft passed over midpoint of grid cell row along the nadir track";
String units "degrees";
String coordinates "along_track_time";
Float32 valid_min -3.;
Float32 valid_max 3.;
Float32 _FillValue -9999.;
}
/Spacecraft_Data/yaw {
String long_name "SC yaw interpolated to time spacecraft passed over midpoint of grid cell row along the nadir track";
String units "degrees";
String coordinates "along_track_time";
Float32 valid_min -3.;
Float32 valid_max 3.;
Float32 _FillValue -9999.;
}
/Spacecraft_Data/x_vel {
String units "meters/second";
String coordinates "along_track_time";
String long_name "SC velocity in x direction of Earth Centered Rotating coordinate system interpolated to time spacecraft passed over midpoint of grid cell row along the nadir track";
Float32 valid_min -8000.;
Float32 valid_max 8000.;
Float32 _FillValue -9999.;
}
/Spacecraft_Data/along_track_qual_flag {
String coordinates "along_track_time";
String flag_masks "1s, 2s, 4s";
String long_name "Bit flags that record the quality of spacecraft position, velocity and orientation measurements for each cross track row.";
String flag_meanings "EPHEMERIS_QUAL ATTITUDE_QUAL ANTENNA_POINTING_QUAL";
}
/Spacecraft_Data/antenna_scan_angle {
String units "degrees";
String coordinates "along_track_time";
String long_name "The angle in the X-Y plane of the spacecraft coordinate system that indicates the angular position of the antenna assembly interpolated to the time the spacecraft passed over the midpoint of the grid cell row along the nadir track. The angle is measured in the counterclockwise direction from the X axis, which approximates the direction of motion of the spacecraft.";
Float32 valid_min 0.;
Float32 valid_max 359.9989929;
Float32 _FillValue -9999.;
}
/Spacecraft_Data/x_pos {
String units "meters";
String coordinates "along_track_time";
String long_name "SC position in x direction of Earth Centered Rotating coordinate system interpolated to time spacecraft passed over midpoint of grid cell row along the nadir track";
Float32 valid_min -9999999.;
Float32 valid_max 9999999.;
Float32 _FillValue -9999.;
}
/Spacecraft_Data/z_pos {
String units "meters";
String coordinates "along_track_time";
String long_name "SC position in z direction of Earth Centered Rotating coordinate system interpolated to time spacecraft passed over midpoint of grid cell row along the nadir track";
Float32 valid_min -9999999.;
Float32 valid_max 9999999.;
Float32 _FillValue -9999.;
}
/Spacecraft_Data/y_pos {
String units "meters";
String coordinates "along_track_time";
String long_name "SC position in y direction of Earth Centered Rotating coordinate system interpolated to time spacecraft passed over midpoint of grid cell row along the nadir track";
Float32 valid_min -9999999.;
Float32 valid_max 9999999.;
Float32 _FillValue -9999.;
}
/Spacecraft_Data/right_ascension {
String units "degrees";
String coordinates "along_track_time";
String long_name "Right ascension of the spacecraft boresight vector at the time the spacecraft passed over the midpoint of the grid cell row along the nadir track.";
Float32 valid_min 0.;
Float32 valid_max 359.9989929;
Float32 _FillValue -9999.;
}
/Spacecraft_Data/sc_alongtrack_velocity {
String long_name "Spacecraft velocity in the direction of the spacecraft orbital track.";
String coordinates "along_track_time";
Float32 valid_min -8000.;
Float32 valid_max 8000.;
Float32 _FillValue -9999.;
String units "meters/second";
}
/Spacecraft_Data/sc_radial_velocity {
String units "meters/second";
String coordinates "along_track_time";
String long_name "Spacecraft velocity in the direction of the radius of the orbital track. Velocity that records change in altitude.";
Float32 valid_min -8000.;
Float32 valid_max 8000.;
Float32 _FillValue -9999.;
}
/Spacecraft_Data/roll {
String long_name "SC roll interpolated to time spacecraft passed over midpoint of grid cell row along the nadir track";
String units "degrees";
String coordinates "along_track_time";
Float32 valid_min -3.;
Float32 valid_max 3.;
Float32 _FillValue -9999.;
}
/Spacecraft_Data/declination {
String units "degrees";
String coordinates "along_track_time";
String long_name "Declination of the spacecraft boresight vector at the time the spacecraft passed over the midpoint of the grid cell row along the nadir track.";
Float32 valid_min -90.;
Float32 valid_max 90.;
Float32 _FillValue -9999.;
}
/Spacecraft_Data/antenna_look_angle {
String units "degrees";
String coordinates "along_track_time";
String long_name "The angle defined by the antenna boresight vector and the spacecraft nadir vector interpolated to the time the spacecraft passed over the midpoint of the grid cell row along the nadir track.";
Float32 valid_min 0.;
Float32 valid_max 180.;
Float32 _FillValue -9999.;
}
/Spacecraft_Data/y_vel {
String units "meters/second";
String coordinates "along_track_time";
String long_name "SC velocity in y direction of Earth Centered Rotating coordinate system interpolated to time spacecraft passed over midpoint of grid cell row along the nadir track";
Float32 valid_min -8000.;
Float32 valid_max 8000.;
Float32 _FillValue -9999.;
}
/Spacecraft_Data/along_track_mode_flag {
String long_name "Bit flags that indicate the operational model or behavior of the spacecraft for each cross track row.";
String coordinates "along_track_time";
String flag_masks "1s, 2s, 4s, 8s";
String flag_meanings "INSTRUMENT_VIEWING_MODE EPHEMERIS_USAGE XPOL_DATA XPOL_TRANSITION";
}
/Spacecraft_Data/sc_nadir_angle {
String units "degrees";
String coordinates "along_track_time";
String long_name "The angle defined by the spacecraft geodetic nadir vector and the negative Z axis of the spacecraft coordinate system at the time the spacecraft passed over the midpoint of the grid cell row along the nadir track.";
Float32 valid_min 0.;
Float32 valid_max 180.;
Float32 _FillValue -9999.;
}
/Spacecraft_Data/sc_nadir_lon {
String long_name "Spacecraft longitude at midpoint of grid cell row along nadir track";
String units "degrees_east";
String coordinates "along_track_time";
Float32 valid_min -180.;
Float32 valid_max 179.9989929;
Float32 _FillValue -9999.;
}
/Crosstrack_Data/distance_from_nadir {
String units "meters";
Float32 valid_min -550000.;
String long_name "The distance from the center of the swath grid cell to the spacecraft's sub-nadir track on the Earth's surface.";
Float32 valid_max 550000.;
Float32 _FillValue -9999.;
}
/Crosstrack_Data/sigma0_resolution {
String long_name "Specifies the resolution of sigma0s based on their cross track swath location.";
Float32 valid_min 0.;
Float32 valid_max 10000.;
Float32 _FillValue -9999.;
String units "meters";
}
/Sigma0_Data/cell_lat {
String long_name "Representative geodetic latitude of grid cell";
String units "degrees_north";
Float32 valid_min -90.;
Float32 valid_max 90.;
}
/Sigma0_Data/cell_lon {
String long_name "Representative longitude of grid cell";
String units "degrees_east";
Float32 valid_min -180.;
Float32 valid_max 179.9989929;
}
/Sigma0_Data/cell_altitude_std_dev {
String long_name "Standard deviation of sea level altitude measure for each grid cell";
String units "meters";
String coordinates "cell_lat cell_lon";
Float32 valid_min 0.;
Float32 valid_max 100.;
Float32 _FillValue -9999.;
}
/Sigma0_Data/cell_sigma0_qual_flag_vv {
String long_name "Representative quality flags of vertical polarization sigma0 measures in the grid cell";
String coordinates "cell_lat cell_lon";
String flag_masks "1s, 2s, 4s, 8s, 16s, 32s, 64s, 128s, 256s, 512s, 1024s, 2048s, 4096s, 8192s, 16384s, 32768s";
String flag_meanings "FORWARD_S0_GOOD_QUAL AFT_S0_GOOD_QUAL FORWARD_S0_IN_RANGE AFT_S0_IN_RANGE FORWARD_RFI_DETECTED FORWARD_RFI_CORRECTED AFT_RFI_DETECTED AFT_RFI_CORRECTED FORWARD_FARADAY_ROTATION AFT_FARADAY_ROTATION FORWARD_KP AFT_KP FORWARD_NULL AFT_NULL FORWARD_NADIR_ANGLE AFT_NADIR_ANGLE";
}
/Sigma0_Data/cell_sigma0_xpol_aft {
String long_name "Representative sigma0 measure for aft looks - cross polarization";
String coordinates "cell_lat cell_lon";
Float32 valid_min -0.009999999776;
Float32 valid_max 10.;
Float32 _FillValue -9999.;
}
/Sigma0_Data/cell_sigma0_vv_aft_noise {
String long_name "Representative sigma0 measure before algorithm applies noise subtraction for aft looks - vertical polarization";
String coordinates "cell_lat cell_lon";
Float32 valid_min -0.009999999776;
Float32 valid_max 10.;
Float32 _FillValue -9999.;
}
/Sigma0_Data/cell_area_fore {
String long_name "Sum of the topographic areas used to normalize all of the forward looking sigma0s in the grid cell.";
String units "meters**2";
String coordinates "cell_lat cell_lon";
Float32 valid_min 100.;
Float32 valid_max 10000000.;
Float32 _FillValue -9999.;
}
/Sigma0_Data/faraday_rotation_corr_xpol_fore {
String long_name "Faraday rotation correction applied to forward looking cross-polarized sigma0";
String coordinates "cell_lat cell_lon";
Float32 valid_min 0.;
Float32 valid_max 10.;
Float32 _FillValue -9999.;
}
/Sigma0_Data/cell_sigma0_hh_fore {
String long_name "Representative sigma0 measure for forward looks - horizontal polarization";
String coordinates "cell_lat cell_lon";
Float32 valid_min -0.009999999776;
Float32 valid_max 10.;
Float32 _FillValue -9999.;
}
/Sigma0_Data/cell_kp_hh_fore {
String long_name "Representative components of the forward looking sigma0 error measure that account for calibration error, communication error and contamination - horizontal polarization";
String coordinates "cell_lat cell_lon";
Float32 valid_min 0.;
Float32 valid_max 10.;
Float32 _FillValue -9999.;
}
/Sigma0_Data/cell_kp_xpol_fore {
String coordinates "cell_lat cell_lon";
String long_name "Representative components of the forward looking sigma0 error measure that account for calibration error, communication error and contamination - cross polarization";
Float32 valid_min 0.;
Float32 valid_max 10.;
Float32 _FillValue -9999.;
}
/Sigma0_Data/cell_sigma0_hh_aft {
String long_name "Representative sigma0 measure for aft looks - horizontal polarization";
Float32 valid_min -0.009999999776;
String coordinates "cell_lat cell_lon";
Float32 valid_max 10.;
Float32 _FillValue -9999.;
}
/Sigma0_Data/xpol_correlation_aft {
String long_name "The co-pol to cross-pol correlation for aft looking sigma0s based on common transmitter and both receivers.";
String coordinates "cell_lat cell_lon";
Float32 valid_min -10.;
Float32 valid_max 10.;
Float32 _FillValue -9999.;
}
/Sigma0_Data/cell_kp_hh_aft {
String long_name "Representative components of the aft looking sigma0 error measure that account for calibration error, communication error and contamination - horizontal polarization";
String coordinates "cell_lat cell_lon";
Float32 valid_min 0.;
Float32 valid_max 1.;
Float32 _FillValue -9999.;
}
/Sigma0_Data/polar_grid_column_index {
String coordinates "cell_lat cell_lon";
String long_name "Column index of the location of the center of the swath cell in the 1 km Lambert azimuthal equal area Earth based grid centered on the nearer pole.";
Float32 valid_min 0.;
Float32 valid_max 18000.;
Float32 _FillValue -9999.;
}
/Sigma0_Data/faraday_rotation_corr_hh_aft {
String long_name "Faraday rotation correction applied to aft looking horizontal polarization sigma0";
String coordinates "cell_lat cell_lon";
Float32 valid_min 0.;
Float32 valid_max 10.;
Float32 _FillValue -9999.;
}
/Sigma0_Data/selected_frequency_aft {
String units "MHz";
String coordinates "cell_lat cell_lon";
String long_name "The mid-point frequency of the noise-only channel of the radar instrument when the aft looking data in the specified grid cell were acquired.";
Float32 valid_min 1218.75;
Float32 valid_max 1296.25;
Float32 _FillValue -9999.;
}
/Sigma0_Data/cell_sigma0_xpol_fore {
String long_name "Representative sigma0 measure for forward looks - cross polarization";
String coordinates "cell_lat cell_lon";
Float32 valid_min -0.009999999776;
Float32 valid_max 10.;
Float32 _FillValue -9999.;
}
/Sigma0_Data/xpol_correlation_fore {
String coordinates "cell_lat cell_lon";
String long_name "The co-pol to cross-pol correlation for forward looking sigma0s based on common transmitter and both receivers.";
Float32 valid_min -10.;
Float32 valid_max 10.;
Float32 _FillValue -9999.;
}
/Sigma0_Data/cell_sigma0_qual_flag_xpol {
String long_name "Representative quality flags of cross polarization sigma0 measures in the grid cell";
String coordinates "cell_lat cell_lon";
String flag_masks "1s, 2s, 4s, 8s, 16s, 32s, 64s, 128s, 256s, 512s, 1024s, 2048s, 4096s, 8192s, 16384s, 32768s";
String flag_meanings "FORWARD_S0_GOOD_QUAL AFT_S0_GOOD_QUAL FORWARD_S0_IN_RANGE AFT_S0_IN_RANGE FORWARD_RFI_DETECTED FORWARD_RFI_CORRECTED AFT_RFI_DETECTED AFT_RFI_CORRECTED FORWARD_FARADAY_ROTATION AFT_FARADAY_ROTATION FORWARD_KP AFT_KP FORWARD_NULL AFT_NULL FORWARD_NADIR_ANGLE AFT_NADIR_ANGLE";
}
/Sigma0_Data/earth_incidence_std_dev_fore {
String long_name "Standard deviation of the angle defined by the antenna boresight vector and the normal to the reference Earth surface for all forward looks in the cell.";
String units "degrees";
String coordinates "cell_lat cell_lon";
Float32 valid_min 0.;
Float32 valid_max 90.;
Float32 _FillValue -9999.;
}
/Sigma0_Data/earth_azimuth_std_dev_fore {
String long_name "The standard deviation of the angle defined by the vector that extends from the intersection of the spacecraft geodetic nadir vector on the Earth's surface to geographic North and the vector that extends from the intersection of the spacecraft geodetic nadir on the Earth's surface to the pierce point of the boresight vector for all forward looks in the grid cell.";
String units "degrees";
String coordinates "cell_lat cell_lon";
Float32 valid_min 0.;
Float32 valid_max 359.9989929;
Float32 _FillValue -9999.;
}
/Sigma0_Data/faraday_rotation_corr_vv_fore {
String long_name "Faraday rotation correction applied to forward looking vertical polarization sigma0";
String coordinates "cell_lat cell_lon";
Float32 valid_min 0.;
Float32 valid_max 10.;
Float32 _FillValue -9999.;
}
/Sigma0_Data/selected_frequency_fore {
String units "MHz";
String coordinates "cell_lat cell_lon";
String long_name "The mid-point frequency of the noise-only channel of the radar instrument when the forward looking data in the specified grid cell were acquired.";
Float32 valid_min 1218.75;
Float32 valid_max 1296.25;
Float32 _FillValue -9999.;
}
/Sigma0_Data/slant_range_aft {
String long_name "Representative slant range of aft looking sigma0 measures in grid cell";
String units "meters";
String coordinates "cell_lat cell_lon";
Float32 valid_min 700000.;
Float32 valid_max 1100000.;
Float32 _FillValue -9999.;
}
/Sigma0_Data/earth_azimuth_mean_fore {
String units "degrees";
String coordinates "cell_lat cell_lon";
String long_name "The mean of the angle defined by the vector that extends from the intersection of the spacecraft geodetic nadir vector on the Earth's surface to geographic North and the vector that extends from the intersection of the spacecraft geodetic nadir on the Earth's surface to the pierce point of the boresight vector for all forward looks in the grid cell.";
Float32 valid_min 0.;
Float32 valid_max 359.9989929;
Float32 _FillValue -9999.;
}
/Sigma0_Data/earth_incidence_std_dev_aft {
String long_name "Standard deviation of the angle defined by the antenna boresight vector and the normal to the reference Earth surface for all aft looks in the cell.";
String units "degrees";
String coordinates "cell_lat cell_lon";
Float32 valid_min 0.;
Float32 valid_max 90.;
Float32 _FillValue -9999.;
}
/Sigma0_Data/polarization_rotation_angle_aft {
String long_name "Polarization roll angle at doppler centroid for a grid cell aft look measurement";
String units "degrees";
String coordinates "cell_lat cell_lon";
Float32 valid_min -90.;
Float32 valid_max 90.;
Float32 _FillValue -9999.;
}
/Sigma0_Data/slant_range_fore {
String long_name "Representative slant range of forward looking sigma0 measures in grid cell";
String units "meters";
String coordinates "cell_lat cell_lon";
Float32 valid_min 700000.;
Float32 valid_max 1100000.;
Float32 _FillValue -9999.;
}
/Sigma0_Data/faraday_rotation_corr_vv_aft {
String long_name "Faraday rotation correction applied to aft looking vertical polarization sigma0";
String coordinates "cell_lat cell_lon";
Float32 valid_min 0.;
Float32 valid_max 10.;
Float32 _FillValue -9999.;
}
/Sigma0_Data/cell_gradient {
String long_name "Representative land slope of the grid cell";
String units "degrees";
String coordinates "cell_lat cell_lon";
Float32 valid_min 0.;
Float32 valid_max 90.;
Float32 _FillValue -9999.;
}
/Sigma0_Data/cell_altitude {
String long_name "Representative altitude above sea level of the grid cell";
String units "meters";
String coordinates "cell_lat cell_lon";
Float32 valid_min -100.;
Float32 valid_max 9000.;
Float32 _FillValue -9999.;
}
/Sigma0_Data/cell_kp_vv_fore {
String long_name "Representative components of the forward looking sigma0 error measure that account for calibration error, communication error and contamination - vertical polarization";
String coordinates "cell_lat cell_lon";
Float32 valid_min 0.;
Float32 valid_max 10.;
Float32 _FillValue -9999.;
}
/Sigma0_Data/earth_azimuth_mean_aft {
String long_name "The mean of angle defined by the vector that extends from the intersection of the spacecraft geodetic nadir vector on the Earth's surface to geographic North and the vector that extends from the intersection of the spacecraft geodetic nadir on the Earth's surface to the pierce point of the boresight vector for all aft looks in the grid cell.";
String units "degrees";
String coordinates "cell_lat cell_lon";
Float32 valid_min 0.;
Float32 valid_max 359.9989929;
Float32 _FillValue -9999.;
}
/Sigma0_Data/faraday_rotation_corr_hh_fore {
String long_name "Faraday rotation correction applied to forward looking horizontal polarization sigma0";
String coordinates "cell_lat cell_lon";
Float32 valid_min 0.;
Float32 valid_max 10.;
Float32 _FillValue -9999.;
}
/Sigma0_Data/cell_sigma0_xpol_aft_noise {
String long_name "Representative sigma0 measure before algorithm applies noise subtraction for aft looks - cross polarization";
String coordinates "cell_lat cell_lon";
Float32 valid_min -0.009999999776;
Float32 valid_max 10.;
Float32 _FillValue -9999.;
}
/Sigma0_Data/earth_azimuth_std_dev_aft {
String units "degrees";
String coordinates "cell_lat cell_lon";
String long_name "The standard deviation of angle defined by the vector that extends from the intersection of the spacecraft geodetic nadir vector on the Earth's surface to geographic North and the vector that extends from the intersection of the spacecraft geodetic nadir on the Earth's surface to the pierce point of the boresight vector for all aft looks in the grid cell.";
Float32 valid_min 0.;
Float32 valid_max 359.9989929;
Float32 _FillValue -9999.;
}
/Sigma0_Data/cell_sigma0_hh_aft_noise {
String long_name "Representative sigma0 measure before algorithm applies noise subtraction for aft looks - horizontal polarization";
String coordinates "cell_lat cell_lon";
Float32 valid_min -0.009999999776;
Float32 valid_max 10.;
Float32 _FillValue -9999.;
}
/Sigma0_Data/faraday_rotation_angle_fore {
String long_name "Faraday rotation angle for all forward looking sigma0s in the grid cell.";
String units "degrees";
String coordinates "cell_lat cell_lon";
Float32 valid_min -90.;
Float32 valid_max 90.;
Float32 _FillValue -9999.;
}
/Sigma0_Data/polar_grid_row_index {
String long_name "Row index of the location of the center of the swath cell in the 1 km Lambert azimuthal equal area Earth based grid centered on the nearer pole.";
String coordinates "cell_lat cell_lon";
Float32 valid_min 0.;
Float32 valid_max 18000.;
Float32 _FillValue -9999.;
}
/Sigma0_Data/cell_kp_vv_aft {
String long_name "Representative components of the aft looking sigma0 error measure that account for calibration error, communication error and contamination - vertical polarization";
String coordinates "cell_lat cell_lon";
Float32 valid_min 0.;
Float32 valid_max 1.;
Float32 _FillValue -9999.;
}
/Sigma0_Data/cell_radar_mode_flag {
String long_name "Representative conditions of sigma0 measure for the grid cell";
String coordinates "cell_lat cell_lon";
String flag_masks "1s, 2s, 4s, 8s";
String flag_meanings "RECEIVE_ONLY_MODE_L1C FORWARD_XPOL_DATA AFT_XPOL_DATA NADIR_REGION";
}
/Sigma0_Data/cylindrical_grid_column_index {
String long_name "Column index of the location of the center of the swath cell in the 1 km cylindrical equal area Earth based grid based with a reference latitude of 30 degrees.";
String coordinates "cell_lat cell_lon";
Float32 valid_min 0.;
Float32 valid_max 34704.;
Float32 _FillValue -9999.;
}
/Sigma0_Data/earth_incidence_mean_aft {
String long_name "Mean of the angle defined by the antenna boresight vector and the normal to the reference Earth surface for all aft looks in the grid cell.";
String units "degrees";
String coordinates "cell_lat cell_lon";
Float32 valid_min 0.;
Float32 valid_max 90.;
Float32 _FillValue -9999.;
}
/Sigma0_Data/number_of_cell_looks_aft {
String coordinates "cell_lat cell_lon";
UInt16 valid_min 0;
String long_name "Sum of statistically independent energy measurements that contribute to cell for aft looking sigma0s.";
UInt16 valid_max 130;
UInt16 _FillValue 65534;
}
/Sigma0_Data/cell_sigma0_xpol_fore_noise {
String long_name "Representative sigma0 measure before the algorithm applies noise subtraction for forward looks - cross polarization";
String coordinates "cell_lat cell_lon";
Float32 valid_min -0.009999999776;
Float32 valid_max 10.;
Float32 _FillValue -9999.;
}
/Sigma0_Data/cell_sigma0_qual_flag_hh {
String long_name "Representative quality flags of horizontal polarization sigma0 measures in the grid cell";
String coordinates "cell_lat cell_lon";
String flag_masks "1s, 2s, 4s, 8s, 16s, 32s, 64s, 128s, 256s, 512s, 1024s, 2048s, 4096s, 8192s, 16384s, 32768s";
String flag_meanings "FORWARD_S0_GOOD_QUAL AFT_S0_GOOD_QUAL FORWARD_S0_IN_RANGE AFT_S0_IN_RANGE FORWARD_RFI_DETECTED FORWARD_RFI_CORRECTED AFT_RFI_DETECTED AFT_RFI_CORRECTED FORWARD_FARADAY_ROTATION AFT_FARADAY_ROTATION FORWARD_KP AFT_KP FORWARD_NULL AFT_NULL FORWARD_NADIR_ANGLE AFT_NADIR_ANGLE";
}
/Sigma0_Data/cell_sigma0_vv_aft {
String long_name "Representative sigma0 measure for aft looks - vertical polarization";
String coordinates "cell_lat cell_lon";
Float32 valid_min -0.009999999776;
Float32 valid_max 10.;
Float32 _FillValue -9999.;
}
/Sigma0_Data/cell_area_aft {
String long_name "Sum of the topographic areas used to normalize all of the aft looking sigma0s in the grid cell.";
String units "meters**2";
String coordinates "cell_lat cell_lon";
Float32 valid_min 100.;
Float32 valid_max 10000000.;
Float32 _FillValue -9999.;
}
/Sigma0_Data/cell_sigma0_vv_fore_noise {
String long_name "Representative sigma0 measure before the algorithm applies noise subtraction for forward looks - vertical polarization";
String coordinates "cell_lat cell_lon";
Float32 valid_min -0.009999999776;
Float32 valid_max 10.;
Float32 _FillValue -9999.;
}
/Sigma0_Data/cell_sigma0_hh_fore_noise {
String long_name "Representative sigma0 measure before the algorithm applies noise subtraction for forward looks - horizontal polarization";
String coordinates "cell_lat cell_lon";
Float32 valid_min -0.009999999776;
Float32 valid_max 10.;
Float32 _FillValue -9999.;
}
/Sigma0_Data/cell_kp_xpol_aft {
String coordinates "cell_lat cell_lon";
String long_name "Representative components of the aft looking sigma0 error measure that account for calibration error, communication error and contamination - cross polarization";
Float32 valid_min 0.;
Float32 valid_max 1.;
Float32 _FillValue -9999.;
}
/Sigma0_Data/cylindrical_grid_row_index {
String coordinates "cell_lat cell_lon";
String long_name "Row index of the location of the center of the swath cell in the 1 km cylindrical equal area Earth based grid based with a reference latitude of 30 degrees.";
Float32 valid_min 0.;
Float32 valid_max 14616.;
Float32 _FillValue -9999.;
}
/Sigma0_Data/faraday_rotation_corr_xpol_aft {
String long_name "Faraday rotation correction applied to aft looking cross-polarized sigma0";
String coordinates "cell_lat cell_lon";
Float32 valid_min 0.;
Float32 valid_max 10.;
Float32 _FillValue -9999.;
}
/Sigma0_Data/number_of_cell_looks_fore {
String coordinates "cell_lat cell_lon";
UInt16 valid_min 0;
String long_name "Sum of statistically independent energy measurements that contribute to cell for forward looking sigma0s.";
UInt16 valid_max 130;
UInt16 _FillValue 65534;
}
/Sigma0_Data/polarization_rotation_angle_fore {
String long_name "Polarization roll angle at doppler centroid for a grid cell forward look measurement";
String units "degrees";
String coordinates "cell_lat cell_lon";
Float32 valid_min -90.;
Float32 valid_max 90.;
Float32 _FillValue -9999.;
}
/Sigma0_Data/faraday_rotation_angle_aft {
String long_name "Faraday rotation angle for all aft looking sigma0s in the grid cell.";
String units "degrees";
String coordinates "cell_lat cell_lon";
Float32 valid_min -90.;
Float32 valid_max 90.;
Float32 _FillValue -9999.;
}
/Sigma0_Data/cell_sigma0_vv_fore {
String long_name "Representative sigma0 measure for forward looks - vertical polarization";
String coordinates "cell_lat cell_lon";
Float32 valid_min -0.009999999776;
Float32 valid_max 10.;
Float32 _FillValue -9999.;
}
/Sigma0_Data/earth_incidence_mean_fore {
String units "degrees";
String coordinates "cell_lat cell_lon";
String long_name "Mean of the angle defined by the antenna boresight vector and the normal to the reference Earth surface for all forward looks in the grid cell.";
Float32 valid_min 0.;
Float32 valid_max 90.;
Float32 _FillValue -9999.;
}
build_dmrpp_metadata {
String created "2025-12-22T18:25:06Z";
String build_dmrpp "3.21.1";
String bes "3.21.1";
String libdap "libdap-3.21.1";
String invocation "build_dmrpp -f /Users/myang6/Desktop/tmp-amazon-nasa-files/SMAP_L1C_S0_HIRES_02298_A_20150707T160502_R13080_001.h5 -r SMAP_L1C_S0_HIRES_02298_A_20150707T160502_R13080_001.h5.dmr -u OPeNDAP_DMRpp_DATA_ACCESS_URL -M";
}
Metadata {
String iso_19139_dataset_xml_md5 "cb6e2138097bef71875ee52cec9184b2";
String iso_19139_series_xml_md5 "11fd6eca9d0014de81172eebac9d519c";
String iso_19139_dataset_xml "
SMAP_L1C_S0_HIRES_02298_A_20150707T160502_R13080_001.h5
eng
utf8
dataset
ASF > Alaska Satellite Facility
uso@asf.alaska.edu
http://www.asf.alaska.edu/
pointOfContact
2016-05-07
ISO 19115-2 Geographic information \\342\\200\\224 Metadata \\342\\200\\224 Part 2: Extensions for imagery and gridded data
ISO 19115-2:2009-02-15
2
crossTrack
1087
1
track
15926
1
area
0
false
SMAP_L1C_S0_HIRES_02298_A_20150707T160502_R13080_001.h5
2016-05-07
creation
R13080
SPL1CS0
http://smap.jpl.nasa.gov
The ECS Short Name
63191736-8e41-4c0b-ab1b-3991b447ba3a
urn:uuid
A Universally Unique Identifier (UUID)
003
gov.nasa.esdis
The ECS Version ID
Jet Propulsion Laboratory
4800 Oak Grove Drive
Pasadena
California
91109
United States
originator
documentDigital
L1C_S0_HiRes
The calibrated/validated release of the SMAP Level 1C Radar (L1C_S0_HiRes) Science Processing Software.
Calibrated normalized synthetic aperture radar cross section measures multilooked onto a 1 km grid that conforms to the SMAP spacecraft path.
The SMAP L1C radar data product delivers the basic radar backscatter measurements at sufficiently high resolution (1 km) to meet SMAP soil moisture retrieval requirements as well as support other scientific studies while keeping the file sizes manageable for most scientific data users.
The software that generates the Level 1C S0 HiRes product and the data system that automates its production were designed and implemented at the Jet Propulsion Laboratory, California Institute of Technology in Pasadena, California.
onGoing
asNeeded
2016-05-01
dataset
HDF5
1.8.13
SMAP_L1C_S0_HIRES_02298_A_20150707T160502_R13080_001.qa
2016-05-07
creation
R13080
An ASCII product that contains statistical information on data product results. These statistics enable data producers and users to assess the quality of the data in the data product granule.
crossReference
grid
eng
utf8
geoscientificInformation
Data product generated by the SMAP mission in HDF5 format with ISO 19115 conformant metadata.
The radar operated nominally since launch to July 7, 2015. On July 7 ,2015 (orbit 2301 A) the transmitter stopped transmitting and the data are all receive only afterwards. The radar instrument always generates high resolution and low resolution radar data. The SMAP spacecraft always downlinks low resolution radar data. High resolution radar data are voluminous. Thus, the SMAP spacecraft downlinks high resolution data when the spacecraft antenna boresight is: 1) Looking forward or looking aft over all land surfaces except Antarctica when the satellite is viewing the Earth at approximately 6:00 AM local time. 2) Looking forward over all land surfaces North of 45 degrees North latitude when the satellite is viewing the Earth at approximately 6:00 PM local time, and 3) Looking forward over coastal ocean regions when the satellite is viewing the Earth at approximately 6:00 AM local time. Coastal ocean is defined as those regions that are within 1000 km of a continental or major island shoreline. The High resolution downlink strategy explained above applies to the data from launch to April 29, 2015 (orbit 1289A). From orbit 1289D to orbit 1364D (May 4, 2015), the high resolution downlink is expanded and the following is added: Looking forward and looking aft over all land surfaces South of 45 degrees North latitude only on the land surface of the American continents when the satellite is viewing the Earth at approximately 6:00 PM local time. Then, on and after orbit 1356A (May 4, 2015), the high resolution data that is downlinked becomes 1) Looking forward or looking aft over all land surfaces except Antarctica when the satellite is viewing the Earth at approximately 6:00 AM local time 2) Looking forward or looking aft over all land surfaces except Antarctica when the satellite is viewing the Earth at approximately 6:00 PM local time, and 3) Looking forward over coastal ocean regions when the satellite is viewing the Earth at approximately 6:00 AM local time.
1
-86.93 118.43 -86.68 93.43 -85.43 69.43 -80 46.16 -70 35.31 -60 31.11 -50 28.25 -40 26.08 -30 23.88 -20 21.91 -10 19.92 0 17.93 10 15.67 20 13.41 30 10.38 40 6.83 50 1.75 60 -5.89 70 -21.69 75.68 -46.69 77.18 -71.69 87.18 -71.69 86.68 -46.69 85.43 -22.69 80 -0.42 70 10.18 60 14.38 50 17.49 40 19.66 30 21.86 20 23.83 10 25.82 0 27.81 -10 30.07 -20 32.58 -30 35.36 -40 39.16 -50 43.99 -60 52.13 -70 68.43 -75.68 93.43 -76.93 118.43 -86.93 118.43
2015-07-07T16:05:01.733Z
2015-07-07T16:56:52.702Z
attribute
{ cell_sigma0_hh_fore, cell_sigma0_hh_aft, cell_sigma0_hv_fore ,cell_sigma0_hv_aft, cell_sigma0_vv_fore, cell_sigma0_vv_aft }
Percent of Missing Data
Percent of the grid cells that lack radar data relative to those that fall within the mission data acquisition mask.
directInternal
2.95
Percent of Data Missing due to Radio Frequency Interference (RFI)
Percent of the grid cells where RFI was detected and the algorithm was unable to remove the RFI contamination from the backscatter measure.
directInternal
0.0005821944
Percent of sigma0s that are within Acceptable Range.
Percent of sigma0 measures in the data product that fall within a predefined acceptable range of measure.
directInternal
99.99751
Converts instrument telemetry into a data set that contains horizonally polarized, vertically polarized and cross polarized normalized radar cross sections, each of which are multilooked onto a 1 km swath oriented grid.
2016-05-06T20:11:16.831Z
Soil Moisture Active Passive Mission (SMAP) Science Data System (SDS) Operations Facility
processor
L1C_S0_HIRES_SPS
L1C S0 HiRes SPS
2016-04-07
revision
036
References software description document if it exists
2014-10-31
publication
L1C Algorithm Parameter File
Soil Moisture Active Passive (SMAP) Synthetic Aperture Radar processing algorithm
2016-02-12
revision
030
The algorithm calculates the projection of the swath grid based on SPICE kernel files generated by the Geometry Simulator. It defines the swath as the rectangular region that encompasses the entire area that the instrument sees over the period of time that the product represents. It uses a simple Earth spherical model to geolocate the swath grid. It also produces those metadata elements that the SPDM requires in order to register and store the output.
Soil Moisture Active Passive (SMAP) L1B_S0_LoRes L1C_S0_HiRes Algorithm Theoretical Basis Document
2013-09-16
publication
Final
EOS Additional Attributes
processingInformation
uuid for RFIThreshold
http://smap.jpl.nasa.gov
RFIThreshold
float
5
processingInformation
uuid for longTermCalibrationFactor_hh
http://smap.jpl.nasa.gov
longTermCalibrationFactor_hh
float
100
processingInformation
uuid for longTermCalibrationFactor_vv
http://smap.jpl.nasa.gov
longTermCalibrationFactor_vv
float
200
processingInformation
uuid for longTermCalibrationFactor_hv
http://smap.jpl.nasa.gov
longTermCalibrationFactor_hv
float
300
processingInformation
uuid for longTermCalibrationFactor_vh
http://smap.jpl.nasa.gov
longTermCalibrationFactor_vh
float
400
processingInformation
uuid for timeVariableEpoch
http://smap.jpl.nasa.gov
timeVariableEpoch
string
J2000
processingInformation
uuid for epochJulianDate
http://smap.jpl.nasa.gov
epochJulianDate
float
2451545
processingInformation
uuid for epochUTCDateTime
http://smap.jpl.nasa.gov
epochUTCDateTime
dateTime
2000-01-01T11:58:55.816Z
processingInformation
uuid for parameterVersionID
http://smap.jpl.nasa.gov
parameterVersionID
string
036
File that contains Correction factor to be multiplied to sigma0 as a function of orbit position, antenna scan position and antenna elevation to produce intra-swath consistency.
L1CAdHoc_160411_v010.h5
2016-04-11
creation
010
AdHoc Correction File
http://smap.jpl.nasa.gov
One or more data products that specify the offset between the X axis of the SMAP fixed instrument coordinate system and the X axis of the SMAP rotating instrument coordinate system over the same time period as the input Level 1A radar data.
smap_ar_1507071543_1507071628_v01.bc
2015-10-30
creation
01
Antenna azimuth
http://smap.jpl.nasa.gov
One or more data products that specify the offset between the X axis of the SMAP fixed instrument coordinate system and the X axis of the SMAP rotating instrument coordinate system over the same time period as the input Level 1A radar data.
smap_ar_1507071654_1507071713_v01.bc
2015-10-30
creation
01
Antenna azimuth
http://smap.jpl.nasa.gov
One or more data products that specify the offset between the X axis of the SMAP fixed instrument coordinate system and the X axis of the SMAP rotating instrument coordinate system over the same time period as the input Level 1A radar data.
smap_ar_1507071628_1507071655_v01.bc
2015-10-30
creation
01
Antenna azimuth
http://smap.jpl.nasa.gov
One or more data products that specify the spacecraft attitude over the same time period as the input Level 1A radar data.
smap_at_1507070001_1507080141_v04.bc
2015-07-08
creation
04
Attitude
http://smap.jpl.nasa.gov
The file that provides the means to encode and/or decode the exponent values of the high resolution radar telemetry using the Bit Floating Point Quantization method.
bfpq_mult_decode_arr_16_4_5_20120101_v001.bin
2012-01-01
creation
001
BFPQ exponent decode table
http://smap.jpl.nasa.gov
The file that provides the means to encode and/or decode that mantissa values of the high resolution radar telemetry using the Bit Floating Point Quantization method.
bfpq_decode_mant_arr_m4_20120101_v001.bin
2012-01-01
creation
001
BFPQ mantissa decode table
http://smap.jpl.nasa.gov
A list of files all of which contain calibration information based on a selected set of external sites. The employed external sites display adequate temporal and spatial stability of radar measures, and thus are deemed valuable for calibration purposes. The files on the list were collected within a time range that is relatively close to the input Level 1A Data. These calibration data were extracted from the high resolution radar data set.
SMAP_CAL_LT_HIRES_LIST_02298_A_20160506T195932843_R13080_001.list
2016-05-06
creation
001
List of high resolution long term radar calibration records
http://smap.jpl.nasa.gov
A list of files all of which contain calibration information based on a selected set of external sites. The employed external sites display adequate temporal and spatial stability of radar measures, and thus are deemed valuable for calibration purposes. The files on the list were collected within a time range that is relatively close to the input Level 1A Data. These calibration data were extracted from the low resolution radar data set.
SMAP_CAL_LT_LORES_LIST_02298_A_20160506T195932952_R13080_001.list
2016-05-06
creation
001
List of low resolution long term radar calibration records
http://smap.jpl.nasa.gov
A file that contains internal calibration information collected from the radar telemetry. The calibration data are specific to the half orbit represented by the input Level 1A Product.
SMAP_CAL_ST_02298_A_20150707T160502_R13080_001.xml
2015-07-07
creation
001
Short term radar calibration record
http://smap.jpl.nasa.gov
A SPICE meta-kernel that lists all of the tiles of the Digital Elevation Map that are required to geolocate the radar data in the input Level 1A Product.
smap_dem_028_A_v002.tm
2015-05-04
creation
002
SPICE meta-kernel that lists the Digital Elevation Map tiles
http://smap.jpl.nasa.gov
One or more data products that list the spacecraft trajectory over the same time period as the input Level 1A radar data.
traj_SPK_1507061300_1507111300_1507081300_sci_OD0162_v00.bsp
2015-07-08
creation
00
Ephemeris
http://smap.jpl.nasa.gov
One or more data products that list the spacecraft trajectory over the same time period as the input Level 1A radar data.
traj_SPK_1507071300_1507121600_1507091600_sci_OD0163_v01.bsp
2015-07-09
creation
01
Ephemeris
http://smap.jpl.nasa.gov
File that specifies the locations of the external targets that used to generate calibration data based on the high resolution radar product.
HiResExternalTargets_131120_v001.xml
2013-11-20
creation
001
High Resolution External Targets File
http://smap.jpl.nasa.gov
A configuration file that specifies the complete set of elements within the input Level 1A Product that the Radar Level 1C Radar Science Processing Software (SPS) needs in order to function.
SMAP_L1C_S0_HIRES_SPS_InputConfig_L1A_Radar.xml
2016-04-18
creation
R13080
Radar level 1C SPS input configuration file
http://smap.jpl.nasa.gov
Parsed and reformatted SMAP radar telemetry. The Level 1A Product contains both synthetic aperture radar data and real aperture radar data. The product also includes loopback data as well as health and status data.
SMAP_L1A_RADAR_02298_A_20150707T160502_R12170_001.h5
2015-11-25
creation
R12170
L1A_Radar
http://smap.jpl.nasa.gov
A short name used by the Soil Moisture Active Passive (SMAP) mission to identify the Level 1A Radar product.
doi:10.5067/DM0U37IYZ6NK
gov.nasa.esdis
A Digital Object Identifier (DOI) that provides a persistent interoperable means to locate the SMAP Level 1A Radar data product.
SMAP Radar Level 1A SPS
250
A configuration file that specifies the source of the values for each of the data elements that comprise the metadata in the output Level 1C Radar product.
SMAP_L1C_S0_HIRES_SPS_MetConfig_L1C_S0_HiRes.xml
2016-04-18
creation
R13080
Radar level 1C SPS metadata configuration file
http://smap.jpl.nasa.gov
A configuration file that lists the entire content of the output Level 1C Radar product.
SMAP_L1C_S0_HIRES_SPS_OutputConfig_L1C_S0_HiRes.xml
2016-04-18
creation
R13080
Radar level 1C SPS output configuration file
http://smap.jpl.nasa.gov
One or more files that completely describe the spatial sensitivity of the SMAP antenna to electromagnetic radiation.
ElAz_Complete_SAR_Band_Hpol_v001.grd
2013-08-05
creation
001
Antenna pattern
http://smap.jpl.nasa.gov
One or more files that completely describe the spatial sensitivity of the SMAP antenna to electromagnetic radiation.
ElAz_Complete_SAR_Band_Vpol_v001.grd
2013-08-05
creation
001
Antenna pattern
http://smap.jpl.nasa.gov
description of the radar level 1C SPS run configuration file
SMAP_L1C_S0_HIRES_SPS_RunConfig_20160506T201116831.xml
2016-05-06
creation
R13080
Radar level 1C SPS run configuration file
http://smap.jpl.nasa.gov
A file that provides a correlation between the time recorded by the spacecraft clock and Coordinated Universal Time (UTC).
smap_cl_v00039.tsc
2016-04-22
creation
00039
Spacecraft Clock UTC Correlation
http://smap.jpl.nasa.gov
A data product that provides a measure of the total electron content in the ionosphere. The International Global Positioning System (GPS) Service for Geodynamics (IGS) provides these files on a daily basis.
igsg1880.15i
2015-07-21
creation
1
Total Electron Content
http://smap.jpl.nasa.gov
SMAP Handbook
2014-07-01
publication
JPL CL#14-2285, JPL 400-1567
SMAP
http://smap.jpl.nasa.gov
The SMAP observatory houses an L-band radiometer that operates at 1.414 GHz and an L-band radar that operates at 1.225 GHz. The instruments share a rotating reflector antenna with a 6 meter aperture that scans over a 1000 km swath. The bus is a 3 axis stabilized spacecraft that provides momentum compensation for the rotating antenna.
SMAP Handbook
2014-07-01
publication
JPL CL#14-2285, JPL 400-1567
SMAP SAR
L-Band Synthetic Aperture Radar
The SMAP 1.225 GHz L-Band Radar Instrument
SMAP Handbook
2014-07-01
publication
JPL CL#14-2285, JPL 400-1567
SMAP RAD
L-Band Radiometer
The SMAP 1.414 GHz L-Band Radiometer
EOS Additional Attributes
platformInformation
uuid for antennaRotationRate
http://smap.jpl.nasa.gov
antennaRotationRate
float
RevolutionsPerMinute (rpm)
14.6
platformInformation
uuid for argumentOfPerigee
http://smap.jpl.nasa.gov
argumentOfPerigee
float
71.23393
platformInformation
uuid for cycleNumber
http://smap.jpl.nasa.gov
cycleNumber
int
19
platformInformation
uuid for eccentricity
http://smap.jpl.nasa.gov
eccentricity
float
0.001269036
platformInformation
uuid for epoch
http://smap.jpl.nasa.gov
epoch
dateTime
2015-07-07T16:30:55.604Z
platformInformation
uuid for equatorCrossingDateTime
http://smap.jpl.nasa.gov
equatorCrossingDateTime
dateTime
2015-07-07T16:30:55.604Z
platformInformation
uuid for equatorCrossingLongitude
http://smap.jpl.nasa.gov
equatorCrossingLongitude
float
22.75331
platformInformation
uuid for inclination
http://smap.jpl.nasa.gov
inclination
float
98.09377
platformInformation
uuid for meanMotion
http://smap.jpl.nasa.gov
meanMotion
float
14.62549
platformInformation
uuid for orbitDirection
http://smap.jpl.nasa.gov
orbitDirection
string
Ascending
platformInformation
uuid for halfOrbitStartDateTime
http://smap.jpl.nasa.gov
halfOrbitStartDateTime
dateTime
2015-07-07T16:06:16.000Z
platformInformation
uuid for halfOrbitStopDateTime
http://smap.jpl.nasa.gov
halfOrbitStopDateTime
dateTime
2015-07-07T16:55:30.000Z
platformInformation
uuid for pathNumber
http://smap.jpl.nasa.gov
pathNumber
int
28
platformInformation
uuid for period
http://smap.jpl.nasa.gov
period
float
seconds
5907.495
platformInformation
uuid for referenceCRS
http://smap.jpl.nasa.gov
referenceCRS
string
J2000
platformInformation
uuid for revNumber
http://smap.jpl.nasa.gov
revNumber
int
2298
platformInformation
uuid for rightAscensionAscendingNode
http://smap.jpl.nasa.gov
rightAscensionAscendingNode
float
195.6234
platformInformation
uuid for semiMajorAxis
http://smap.jpl.nasa.gov
semiMajorAxis
float
km
7066.562
";
String iso_19139_series_xml "
L1C_S0_HiRes
eng
utf8
series
ASF > Alaska Satellite Facility
uso@asf.alaska.edu
http://www.asf.alaska.edu/
pointOfContact
2014-05-09
ISO 19115-2 Geographic information - Metadata - Part 2: Extensions for imagery and gridded data
ISO 19115-2:2009-02-15
SMAP L1C Radar Half-Orbit High-Resolution sigma naught Data on 1 km Swath Grid
2016-03-31
revision
R13
SPL1CS0
smap.jpl.nasa.gov
The ECS Short Name
003
gov.nasa.esdis
The ECS Version ID
doi:10.5067/E0QIAMXM89YY
gov.nasa.esdis
A Digital Object Identifier (DOI)
National Aeronautics and Space Administration (NASA)
resourceProvider
Jet Propulsion Laboratory
originator
documentDigital
The calibrated/validated release of the SMAP Level 1C Radar (L1C_S0_HiRes) Science Processing Software.
Calibrated normalized synthetic aperture radar cross section measures multilooked onto a 1 km grid that conforms to the SMAP spacecraft path.
The SMAP L1C radar data product delivers the basic radar backscatter measurements at sufficiently high resolution (1 km) to meet SMAP soil
moisture retrieval requirements as well as support other scientific studies while keeping the file sizes manageable for most scientific data users
The software that generates the Level 1C S0 HiRes product and the data system that automates its production were designed and implemented
at the Jet Propulsion Laboratory, California Institute of Technology in Pasadena, California.
onGoing
Alaska Satellite Facility
distributor
EARTH SCIENCE > SPECTRAL/ENGINEERING > PLATFORM CHARACTERISTICS > ORBITAL CHARACTERISTICS
EARTH SCIENCE > SPECTRAL/ENGINEERING > RADAR > RADAR IMAGERY
EARTH SCIENCE > SPECTRAL/ENGINEERING > RADAR > SIGMA NAUGHT
theme
NASA/GCMD Earth Science Keywords
Earth Remote Sensing Instruments > Active Remote Sensing > Imaging Radars > > SMAP L-BAND RADAR > SMAP L-Band Radar
theme
NASA/GCMD Earth Science Keywords
Earth Observation Satellites > NASA Decadal Survey > SMAP > Soil Moisture Active and Passive Observatory
theme
NASA/GCMD Earth Science Keywords
GEOGRAPHIC REGION > GLOBAL
theme
NASA/GCMD Earth Science Keywords
SMAP
largerWorkCitation
mission
grid
1000
eng
utf8
geoscientificInformation
Data product generated by the SMAP mission in HDF5 format with metadata that conforms to the ISO 19115 model.
The radar operated nominally since launch to July 7, 2015. On July 7, 2015 (orbit 2301 A) the transmitter stopped transmitting and the data are all receive only afterwards.
The radar instrument always generates high resolution and low resolution radar data. The SMAP spacecraft always downlinks low resolution radar data. High resolution radar data are voluminous.
Thus, the SMAP spacecraft downlinks high resolution data when the spacecraft antenna boresight is:
1) Looking forward or looking aft over all land surfaces except Antarctica when the satellite is viewing the Earth at approximately 6:00 AM local time
2) Looking forward over all land surfaces North of 45 degrees North latitude when the satellite is viewing the Earth at approximately 6:00 PM local time, and
3) Looking forward over coastal ocean regions when the satellite is viewing the Earth at approximately 6:00 AM local time.
Coastal ocean is defined as those regions that are within 1000 km of a continental or major island shoreline.
The High resolution downlink strategy explained above applies to the data from launch to April 29, 2015 (orbit 1289A). From orbit 1289D to orbit 1364D (May 4, 2015), the high resolution downlink is expanded and the following is added:
- Looking forward and looking aft over all land surfaces South of 45 degrees North latitude only on the land surface of the American continents when the satellite is viewing the Earth at approximately 6:00 PM local time.
Then, on and after orbit 1356A (May 4, 2015), the high resolution data that is downlinked becomes
1) Looking forward or looking aft over all land surfaces except Antarctica when the satellite is viewing the Earth at approximately 6:00 AM local time
2) Looking forward or looking aft over all land surfaces except Antarctica when the satellite is viewing the Earth at approximately 6:00 PM local time, and
3) Looking forward over coastal ocean regions when the satellite is viewing the Earth at approximately 6:00 AM local time.
1
-180.00
180.00
-87.00
87.00
2015-04-13T00:00:00.000Z
2020-12-31T23:59:59.999Z
Product Specification Document for the SMAP Level 1C Radar Product (L1C_S0_HiRes)
2015-10-30
publication
1.0
L1C_S0_HiRes
smap.jpl.nasa.gov
Short name used by the Soil Moisture Active Passive (SMAP) mission to identify the Level 1C Radar product.
documentDigital
The Product Specification Document that fully describes the content and format of this data product.
eng
";
AcquisitionInformation {
platform {
Float32 antennaRotationRate 14.60000038;
String description "The SMAP observatory houses an L-band radiometer that operates at 1.414 GHz and an L-band radar that operates at 1.225 GHz. The instruments share a rotating reflector antenna with a 6 meter aperture that scans over a 1000 km swath. The bus is a 3 axis stabilized spacecraft that provides momentum compensation for the rotating antenna.";
String identifier "SMAP";
}
platformDocument {
String publicationDate "2014-07-01";
String edition "JPL CL#14-2285, JPL 400-1567";
String title "SMAP Handbook";
}
radarDocument {
String publicationDate "2014-07-01";
String edition "JPL CL#14-2285, JPL 400-1567";
String title "SMAP Handbook";
}
radiometerDocument {
String publicationDate "2014-07-01";
String edition "JPL CL#14-2285, JPL 400-1567";
String title "SMAP Handbook";
}
radar {
String description "The SMAP 1.225 GHz L-Band Radar Instrument";
String identifier "SMAP SAR";
String type "L-Band Synthetic Aperture Radar";
}
radiometer {
String description "The SMAP 1.414 GHz L-Band Radiometer";
String identifier "SMAP RAD";
String type "L-Band Radiometer";
}
}
DataQuality {
String scope "{ cell_sigma0_hh_fore, cell_sigma0_hh_aft, cell_sigma0_hv_fore ,cell_sigma0_hv_aft, cell_sigma0_vv_fore, cell_sigma0_vv_aft }";
CompletenessOmission {
Float32 value 2.950000048;
String evaluationMethodType "directInternal";
String measureDescription "Percent of the grid cells that lack radar data relative to those that fall within the mission data acquisition mask.";
String nameOfMeasure "Percent of Missing Data";
String unitofMeasure "percent";
}
RFICompletenessOmission {
Float32 value 0.0005821944214;
String evaluationMethodType "directInternal";
String measureDescription "Percent of the grid cells where RFI was detected and the algorithm was unable to remove the RFI contamination from the backscatter measure.";
String nameOfMeasure "Percent of Data Missing due to Radio Frequency Interference (RFI)";
String unitofMeasure "percent";
}
DomainConsistency {
Float32 value 99.99751282;
String evaluationMethodType "directInternal";
String measureDescription "Percent of sigma0 measures in the data product that fall within a predefined acceptable range of measure.";
String nameOfMeasure "Percent of sigma0s that are within Acceptable Range.";
String unitofMeasure "percent";
}
}
ProductSpecificationDocument {
String language "eng";
String characterSet "utf8";
String publicationDate "2014-10-31";
String edition "version ID";
String title "Soil Moisture Active Passive Mission L1C_S0_HiRes Product Specification Document";
String SMAPShortName "L1C_S0_HiRes";
}
SeriesIdentification {
String otherCitationDetails "The calibrated/validated release of the SMAP Level 1C Radar (L1C_S0_HiRes) Science Processing Software.";
String shortName "SPL1CS0";
String mission "Soil Moisture Active Passive (SMAP)";
String characterSet "utf8";
String resourceProviderOrganizationName "National Aeronautics and Space Administration (NASA)";
String language "eng";
String ECSVersionID "003";
String abstract "Calibrated normalized synthetic aperture radar cross section measures multilooked onto a 1 km grid that conforms to the SMAP spacecraft path.";
String status "onGoing";
String revisionDate "2015-10-30";
String credit "The software that generates the Level 1C_S0_HiRes product and the data system that automates its production were designed and implemented at the Jet Propulsion Laboratory, California Institute of Technology in Pasadena, California.";
String topicCategory "geoscientificInformation";
String purpose "The SMAP L1C radar data product delivers the basic radar backscatter measurements at sufficiently high resolution (1 km) to meet SMAP soil moisture retrieval requirements as well as support other scientific studies while keeping the file sizes manageable for most scientific data users.";
String longName "SMAP L1C Radar Half-Orbit High-Resolution sigma0 Data on 1 km Swath Grid";
String pointOfContact "Alaska Satellite Facility, Fairbanks Alaska";
String CompositeReleaseID "R13080";
String spatialRepresentationType "grid";
String identifier_product_DOI "http://dx.doi.org/10.5067/E0QIAMXM89YY";
}
DatasetIdentification {
String spatialRepresentationType "grid";
String characterSet "utf8";
String UUID "63191736-8e41-4c0b-ab1b-3991b447ba3a";
String language "eng";
String formatVersion "1.8.13";
String ECSVersionID "003";
String abstract "Calibrated normalized synthetic aperture radar cross section measures multilooked onto a 1 km grid that conforms to the SMAP spacecraft path.";
String creationDate "2016-05-07";
String status "onGoing";
String credit "The software that generates the Level 1C S0 HiRes product and the data system that automates its production were designed and implemented at the Jet Propulsion Laboratory, California Institute of Technology in Pasadena, California.";
String topicCategory "geoscientificInformation";
String purpose "The SMAP L1C radar data product delivers the basic radar backscatter measurements at sufficiently high resolution (1 km) to meet SMAP soil moisture retrieval requirements as well as support other scientific studies while keeping the file sizes manageable for most scientific data users.";
String format "HDF5";
String fileName "SMAP_L1C_S0_HIRES_02298_A_20150707T160502_R13080_001.h5";
String maintenanceAndUpdateFrequency "asNeeded";
String CompositeReleaseID "R13080";
String originatorOrganizationName "Jet Propulsion Laboratory";
String maintenanceDate "2016-05-01";
String SMAPShortName "L1C_S0_HiRes";
String shortName "SPL1CS0";
}
Extent {
String description "The radar operated nominally since launch to July 7, 2015. On July 7 ,2015 (orbit 2301 A) the transmitter stopped transmitting and the data are all receive only afterwards. The radar instrument always generates high resolution and low resolution radar data. The SMAP spacecraft always downlinks low resolution radar data. High resolution radar data are voluminous. Thus, the SMAP spacecraft downlinks high resolution data when the spacecraft antenna boresight is: 1) Looking forward or looking aft over all land surfaces except Antarctica when the satellite is viewing the Earth at approximately 6:00 AM local time. 2) Looking forward over all land surfaces North of 45 degrees North latitude when the satellite is viewing the Earth at approximately 6:00 PM local time, and 3) Looking forward over coastal ocean regions when the satellite is viewing the Earth at approximately 6:00 AM local time. Coastal ocean is defined as those regions that are within 1000 km of a continental or major island shoreline. The High resolution downlink strategy explained above applies to the data from launch to April 29, 2015 (orbit 1289A). From orbit 1289D to orbit 1364D (May 4, 2015), the high resolution downlink is expanded and the following is added: Looking forward and looking aft over all land surfaces South of 45 degrees North latitude only on the land surface of the American continents when the satellite is viewing the Earth at approximately 6:00 PM local time. Then, on and after orbit 1356A (May 4, 2015), the high resolution data that is downlinked becomes 1) Looking forward or looking aft over all land surfaces except Antarctica when the satellite is viewing the Earth at approximately 6:00 AM local time 2) Looking forward or looking aft over all land surfaces except Antarctica when the satellite is viewing the Earth at approximately 6:00 PM local time, and 3) Looking forward over coastal ocean regions when the satellite is viewing the Earth at approximately 6:00 AM local time.";
Float32 polygonPosList -86.93000031, 118.4300003, -86.68000031, 93.43000031, -85.43000031, 69.43000031, -80., 46.15999985, -70., 35.31000137, -60., 31.11000061, -50., 28.25, -40., 26.07999992, -30., 23.87999916, -20., 21.90999985, -10., 19.92000008, 0., 17.93000031, 10., 15.67000008, 20., 13.40999985, 30., 10.38000011, 40., 6.829999924, 50., 1.75, 60., -5.889999866, 70., -21.69000053, 75.68000031, -46.68999863, 77.18000031, -71.69000244, 87.18000031, -71.69000244, 86.68000031, -46.68999863, 85.43000031, -22.69000053, 80., -0.4199999869, 70., 10.18000031, 60., 14.38000011, 50., 17.48999977, 40., 19.65999985, 30., 21.86000061, 20., 23.82999992, 10., 25.81999969, 0., 27.80999947, -10., 30.06999969, -20., 32.58000183, -30., 35.36000061, -40., 39.15999985, -50., 43.99000168, -60., 52.13000107, -70., 68.43000031, -75.68000031, 93.43000031, -76.93000031, 118.4300003, -86.93000031, 118.4300003;
String rangeBeginningDateTime "2015-07-07T16:05:01.733Z";
String rangeEndingDateTime "2015-07-07T16:56:52.702Z";
}
QADatasetIdentification {
String fileName "SMAP_L1C_S0_HIRES_02298_A_20150707T160502_R13080_001.qa";
String creationDate "2016-05-07";
String abstract "An ASCII product that contains statistical information on data product results. These statistics enable data producers and users to assess the quality of the data in the data product granule.";
}
GridSpatialRepresentation {
Int32 numberOfDimensions 2;
String cellGeometry "area";
String transformationParameterAvailability "0";
String controlPointAvailability "0";
crossTrack {
Int32 dimensionSize 1087;
String resolution "1 km";
}
track {
Int32 dimensionSize 15926;
String resolution "1 km";
}
}
OrbitMeasuredLocation {
Float32 rightAscensionAscendingNode 195.6233673;
Float32 meanMotion 14.62548828;
Float32 eccentricity 0.001269035507;
Float32 semiMajorAxis 7066.562012;
Int32 orbitPathNumber 28;
String epoch "2015-07-07T16:30:55.604Z";
Int32 cycleNumber 19;
String halfOrbitStopDateTime "2015-07-07T16:55:30.000Z";
Float32 inclination 98.09376526;
String halfOrbitStartDateTime "2015-07-07T16:06:16.000Z";
String equatorCrossingDateTime "2015-07-07T16:30:55.604Z";
String orbitDirection "Ascending";
Float32 argumentOfPerigee 71.2339325;
Float32 orbitPeriod 5907.495117;
String referenceCRS "J2000";
Int32 revNumber 2298;
Float32 equatorCrossingLongitude 22.75331116;
}
Lineage {
OutputConfiguration {
String description "A configuration file that lists the entire content of the output Level 1C Radar product.";
String fileName "SMAP_L1C_S0_HIRES_SPS_OutputConfig_L1C_S0_HiRes.xml";
String creationDate "2016-04-18";
String version "R13080";
}
DEM {
String description "A SPICE meta-kernel that lists all of the tiles of the Digital Elevation Map that are required to geolocate the radar data in the input Level 1A Product.";
String fileName "smap_dem_028_A_v002.tm";
String creationDate "2015-05-04";
String version "002";
}
CalibrationLongTermLoRes {
String description "A list of files all of which contain calibration information based on a selected set of external sites. The employed external sites display adequate temporal and spatial stability of radar measures, and thus are deemed valuable for calibration purposes. The files on the list were collected within a time range that is relatively close to the input Level 1A Data. These calibration data were extracted from the low resolution radar data set.";
String fileName "SMAP_CAL_LT_LORES_LIST_02298_A_20160506T195932952_R13080_001.list";
String creationDate "2016-05-06";
String version "001";
}
TotalElectronContent {
String description "A data product that provides a measure of the total electron content in the ionosphere. The International Global Positioning System (GPS) Service for Geodynamics (IGS) provides these files on a daily basis.";
String fileName "igsg1880.15i";
String creationDate "2015-07-21";
String version "1";
}
CalibrationShortTerm {
String description "A file that contains internal calibration information collected from the radar telemetry. The calibration data are specific to the half orbit represented by the input Level 1A Product.";
String fileName "SMAP_CAL_ST_02298_A_20150707T160502_R13080_001.xml";
String creationDate "2015-07-07";
String version "001";
}
HiResExternalTargets {
String description "File that specifies the locations of the external targets that used to generate calibration data based on the high resolution radar product.";
String fileName "HiResExternalTargets_131120_v001.xml";
String creationDate "2013-11-20";
String version "001";
}
RunConfiguration {
String description " description of the radar level 1C SPS run configuration file";
String fileName "SMAP_L1C_S0_HIRES_SPS_RunConfig_20160506T201116831.xml";
String creationDate "2016-05-06";
String version "R13080";
}
SpacecraftClockUTC {
String description "A file that provides a correlation between the time recorded by the spacecraft clock and Coordinated Universal Time (UTC).";
String fileName "smap_cl_v00039.tsc";
String creationDate "2016-04-22";
String version "00039";
}
CalibrationLongTermHiRes {
String description "A list of files all of which contain calibration information based on a selected set of external sites. The employed external sites display adequate temporal and spatial stability of radar measures, and thus are deemed valuable for calibration purposes. The files on the list were collected within a time range that is relatively close to the input Level 1A Data. These calibration data were extracted from the high resolution radar data set.";
String fileName "SMAP_CAL_LT_HIRES_LIST_02298_A_20160506T195932843_R13080_001.list";
String creationDate "2016-05-06";
String version "001";
}
BFPQDecodeMantissaTable {
String description "The file that provides the means to encode and/or decode that mantissa values of the high resolution radar telemetry using the Bit Floating Point Quantization method.";
String fileName "bfpq_decode_mant_arr_m4_20120101_v001.bin";
String creationDate "2012-01-01";
String version "001";
}
L1A_Radar {
String description "Parsed and reformatted SMAP radar telemetry. The Level 1A Product contains both synthetic aperture radar data and real aperture radar data. The product also includes loopback data as well as health and status data.";
String resolution "250 m";
String DOI "http://dx.doi.org/10.5067/DM0U37IYZ6NK";
String fileName "SMAP_L1A_RADAR_02298_A_20150707T160502_R12170_001.h5";
String creationDate "2015-11-25";
String version "R12170";
String identifier "L1A_Radar";
}
Ephemeris {
String description "One or more data products that list the spacecraft trajectory over the same time period as the input Level 1A radar data.";
String fileName "traj_SPK_1507061300_1507111300_1507081300_sci_OD0162_v00.bsp", "traj_SPK_1507071300_1507121600_1507091600_sci_OD0163_v01.bsp";
String creationDate "2015-07-08", "2015-07-09";
String version "00", "01";
}
MetadataConfiguration {
String description "A configuration file that specifies the source of the values for each of the data elements that comprise the metadata in the output Level 1C Radar product.";
String fileName "SMAP_L1C_S0_HIRES_SPS_MetConfig_L1C_S0_HiRes.xml";
String creationDate "2016-04-18";
String version "R13080";
}
InputConfiguration {
String description "A configuration file that specifies the complete set of elements within the input Level 1A Product that the Radar Level 1C Radar Science Processing Software (SPS) needs in order to function.";
String fileName "SMAP_L1C_S0_HIRES_SPS_InputConfig_L1A_Radar.xml";
String creationDate "2016-04-18";
String version "R13080";
}
Attitude {
String description "One or more data products that specify the spacecraft attitude over the same time period as the input Level 1A radar data.";
String fileName "smap_at_1507070001_1507080141_v04.bc";
String creationDate "2015-07-08";
String version "04";
}
AdHocCorrection {
String description "File that contains Correction factor to be multiplied to sigma0 as a function of orbit position, antenna scan position and antenna elevation to produce intra-swath consistency.";
String fileName "L1CAdHoc_160411_v010.h5";
String creationDate "2016-04-11";
String version "010";
}
RadarAntennaPattern {
String description "One or more files that completely describe the spatial sensitivity of the SMAP antenna to electromagnetic radiation.";
String fileName "ElAz_Complete_SAR_Band_Hpol_v001.grd", "ElAz_Complete_SAR_Band_Vpol_v001.grd";
String creationDate "2013-08-05", "2013-08-05";
String version "001", "001";
}
BFPQDecodeExponentTable {
String description "The file that provides the means to encode and/or decode the exponent values of the high resolution radar telemetry using the Bit Floating Point Quantization method.";
String fileName "bfpq_mult_decode_arr_16_4_5_20120101_v001.bin";
String creationDate "2012-01-01";
String version "001";
}
AntennaAzimuth {
String description "One or more data products that specify the offset between the X axis of the SMAP fixed instrument coordinate system and the X axis of the SMAP rotating instrument coordinate system over the same time period as the input Level 1A radar data.";
String fileName "smap_ar_1507071543_1507071628_v01.bc", "smap_ar_1507071654_1507071713_v01.bc", "smap_ar_1507071628_1507071655_v01.bc";
String creationDate "2015-10-30", "2015-10-30", "2015-10-30";
String version "01", "01", "01";
}
}
ProcessStep {
String documentVersion "1.0";
String stepDateTime "2016-05-06T20:11:16.831Z";
Float32 longTermCalibrationFactor_hv 300.;
String documentation "References software description document if it exists";
Float32 longTermCalibrationFactor_vv 200.;
String epochUTCDateTime "2000-01-01T11:58:55.816Z";
String algorithmVersionID "030";
Float32 longTermCalibrationFactor_vh 400.;
String softwareTitle "L1C S0 HiRes SPS";
String algorithmDate "2016-02-12";
String parameterVersionID "036";
String identifier "L1C_S0_HIRES_SPS";
String ATBDVersion "Final";
String softwareDate "2016-04-07";
String ATBDDate "2013-09-16";
String SWVersionID "036";
String algorithmDescription "The algorithm calculates the projection of the swath grid based on SPICE kernel files generated by the Geometry Simulator. It defines the swath as the rectangular region that encompasses the entire area that the instrument sees over the period of time that the product represents. It uses a simple Earth spherical model to geolocate the swath grid. It also produces those metadata elements that the SPDM requires in order to register and store the output.";
String ATBDTitle "Soil Moisture Active Passive (SMAP) L1B_S0_LoRes L1C_S0_HiRes Algorithm Theoretical Basis Document";
Float32 epochJulianDate 2451545.;
Float32 RFIThreshold 5.;
String timeVariableEpoch "J2000";
String documentDate "2014-10-31";
String processor "Soil Moisture Active Passive Mission (SMAP) Science Data System (SDS) Operations Facility";
String algorithmTitle "Soil Moisture Active Passive (SMAP) Synthetic Aperture Radar processing algorithm";
Float32 longTermCalibrationFactor_hh 100.;
String runTimeParameters "L1C Algorithm Parameter File";
String processDescription "Converts instrument telemetry into a data set that contains horizonally polarized, vertically polarized and cross polarized normalized radar cross sections, each of which are multilooked onto a 1 km swath oriented grid.";
}
}
Spacecraft_Data {
}
Crosstrack_Data {
}
Sigma0_Data {
}
}