Gridded Wind / Wave products processing

Monomission

Multimission

Input data:

• Last 5 days of IGDR data available for each satellite.
  It is thus possible that no map is generated on a given day for a given satellite, if there aren't any new data.

• Last 2 days of IGDR data available for each satellite.
  A merged map is generated if a minimum of 2 missions are available.

Processing:

• Averaging of a mono-mission array by 1°x1° boxes.
• Smoothed and extrapolated by a Loess filter of 16° x 8° (gaps due to missing data are filled, signal is strongly smoothed).
  Extrapolation is limited to 8°x4°, in order to avoid artificially filling areas without data.
• A reduced bathymetry mask is applied : each point more than 2° from the sea is forced to default value.
• If more than 30% of the points have default values, no map will be generated.

• Data are cross-calibrated using OSTM/Jason-2 as reference mission.
  First, sigma0 and waves histograms are calibrated, then the OSTM/Jason-2 wind algorithm is applied to crosscalibrated sigma0.
• Mapping method is then the same as for monomission maps.
• The resulting map may be improved in case of additional mission availability: in that situation a new map will be provided, replacing the "old" one.