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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.
  •  
 
       
Significant wave heights, Jason-1
April 13, 2006 - April 18, 2006  
 
Merged significant wave heights
April 16, 2006 - April, 18 2006  

 

 

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