Minimize Off-nadir Angles

The off-nadir angles are computed at Level-2 processing.

  • Square of the WF-derived off-nadir angle (Ku band) is issued from the ocean retracking in LRM/PLRM modes and from the ocean/coastal retracking in SAR mode. It accounts for modelled instrumental errors correction and system bias.
  • Square of the WF-derived off-nadir angle validity flag (Ku band)
  • Square of the WF-derived off-nadir angle (Ku band) validity flags
  • RMS of the square of the WF-derived off-nadir angle (Ku band)
  • Number of valid points for the square of the WF-derived off-nadir angle (Ku band)
  • Modelled instrumental correction on the square of the WF-derived off-nadir angle (Ku band)
  • PF-derived off-nadir pitch angle
  • PF-derived off nadir roll angle
  • PF-derived off-nadir yaw angle

 

PARAMETER

Square of the Waveform Derived Off-Nadir Angle (Ku band)

NETCDF NAME

corrected_off_nadir_angle_wf_ocean[x1]_[x2]
[x1]: 1 Hz or 20 Hz data rates
[x2]: Ku-band or C-band.

DESCRIPTION

The PLA_MAN_GCM_01 algorithm computes the altimeter off-nadir angle from the platform data file.

UNITS

degrees

DATA SET AVAILABILITY

Reduced: none
Standard: 1 Hz Ku band only
Enhanced: 1 Hz only.

OPERATING MODE AVAILABILITY

LRM and SAR

DATA ORIGIN

1 Hz Ku/C-bands: PLA_MAN_GCM_01 algorithm
20 Hz Ku-band: none
20 Hz C-band: none.

ADDITIONAL INFORMATION

 

PARAMETERS RELATED

Validity flag: val_alt_off_nadir_angle_wf_ocean_[x1]_[x2]
RMS: off_nadir_angle_rms_[x1]_[x2]
Modelled instrumental correction:mod_instr_cor_off_nadir_angle_[x1]_[x2].

PARAMETER DETAILED DESCRIPTION

ESA's Global Land and Ocean Mission for GMES Operational Services

Table 1. Off-nadir angles