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Jason-2 Geophysical Data Record (GDR) and Interim GDR Data Quality Monitoring

The data quality monitoring (DQM) system developed by the satellite oceanography team at NODC is based on the concept of a Rich Inventory developed by the Enterprise Data Systems Group at the National Geophysical Data Center (NGDC). The principle concept of a Rich Inventory is to calculate statistics for selected parameters as files are received and ingested into the archive, store them in a database, and make them available to users and managers of the archive. A "granule" is the smallest data unit over which statistics are calculated - in this case, one pass (half-orbit) of the Jason-2 satellite. Thus, the DQM produces 254 statistical estimates per cycle, one for each pass.

Below are some representative statistics calculated from the selected parameters in a granule as it is ingested into NODC's archive. Parameters we monitor include sea surface height anomaly, Ku-band significant wave height, altimeter wind speed, the difference between altimeter and radiometer wind speeds, the radiometer water vapor content, and the difference between the the radiometer and model wet tropospheric corrections.

GDR Granule Statistics

GDR
(click for a larger view)

IGDR Granule Statistics

IGDR
(click for a larger view)

Statistics for other parameters:

  • Significant wave height (Ku Band): GDR; IGDR
  • Altimeter wind speed: GDR; IGDR
  • Difference between radiometer wet tropospheric and model correction: GDR; IGDR
  • Difference between altimeter and radiometer wind speed: GDR; IGDR
  • Radiometer water vapor content: GDR; IGDR

Latest GDR Sea Surface Height Anomaly
(3.0x1.0 longitude/latitude)

GDR
(click for a larger view)

Latest IGDR Sea Surface Height Anomaly
(0.25x0.25 longitude/latitude)

IGDR
(click for a larger view)

Observations gridded to 3.0x1.0 longitude/latitude:

  • Sea surface height anomaly: IGDR
  • Significant wave height (Ku Band): GDR; IGDR
  • Altimeter wind speed: GDR; IGDR
  • Difference between radiometer wet tropospheric and model correction: GDR; IGDR
  • Difference between altimeter and radiometer wind speed: GDR; IGDR
  • Radiometer water vapor content: GDR; IGDR

Observations gridded to 0.25x0.25 longitude/latitude:

  • Sea surface height anomaly: GDR
  • Significant wave height (Ku Band): GDR; IGDR
  • Altimeter wind speed: GDR; IGDR
  • Difference between radiometer wet tropospheric and model correction: GDR; IGDR
  • Difference between altimeter and radiometer wind speed: GDR; IGDR
  • Radiometer water vapor content: GDR; IGDR

Quality Monitoring News
SOG NODC NOAA CLASS AVHRR SST GODAE MPMC GAC RSMAS GHRSST-PP MCSST NLSST SeaWiFS OAIS
AIP SIP DIP GOSTA NPOESS VIIRS OPeNDAP DODS LAS HRPT LAC GAC HDF-SDS DMAC PO.DAAC LTSRF CoRTAD
  Last modified:    Mon, 7-May-2012 14:49 UTC NODC.Webmaster@noaa.gov
 
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