Topic: Change to processing
standard of Jason-3 data
Date Issued: Issued October 27,
2020 2112Z
Product(s) or Data Impacted: Jason-3 Operational Geophysical Data Records (OGDRs)
Date/Time of Initial Impact: October 28, 2020 2102Z
Date/Time of Expected End: N/A
Length of Event: N/A
Details/Specifics of Change: This is a reminder that Jason-3 altimeter products generated by NOAA and EUMETSAT will be updated to the new GDR-F standard starting tomorrow October 28, 2020.
Since the launch of Jason-3, the GDR-D altimetry product
standard has been used to process Jason-3 data. GDR-D will be
replaced by the new GDR-F standard starting with FCDAS pass
@21:02Z on October 28, 2020. This new standard will also be used
to process the future Sentinel-6 Michael Freilich data (a.k.a.
Jason-CS), thus facilitating multi-mission cross-calibration
activities.
The upgrade to the new GDR-F standard will mostly affect the netCDF
products, and will include the following changes (non-exhaustive
list):
• Improved algorithms for product generation and calibration
• New quality flags added
• Fix to known anomalies
• Use of WGS84 instead of Jason-1 ellipsoid
• New product fields added, like distance to the coast
• Introduction of the netCDF version 4 format and compression for
the output products
• Some variable names modified
For the BUFR product, which is generated from the netCDF
product,certain variables (those that will be removed in the GDR-F
netCDF product) will be left empty after the change. The format of
the BUFR product remains unchanged.
Full details on the changes are in updated versions of the Jason-3
Products Handbook and Jason-3 Products Specification document.
Filenames will also change to reflect the new standard. The letter
representing the version will change from “d” to “f”.
Example for the netCDF products:
netCDF OGDR:
Current filename:
JA3_OPN_2PdS168_068_20200901_231031_20200902_010647.nc.bz2
New filename:
JA3_OPN_2PfS168_068_20200901_231031_20200902_010647.nc.bz2
netCDF OGDR-SSHA:
Current filename:
JA3_OPR_2PdS168_068_20200901_231031_20200902_010647.nc.bz2
New filename:
JA3_OPR_2PfS168_068_20200901_231031_20200902_010647.nc.bz2
Example for the NOAA BUFR product:
Current filename:
W_US-NOAA-Washington,SURFACE+SATELLITE,JASON3+OGDR_C_KNES_20200904112950_d_168_129_20200904110819.
New filename:
W_US-NOAA-Washington,SURFACE+SATELLITE,JASON3+OGDR_C_KNES_20200904112950_f_168_129_20200904110819.
Sample files, in both netCDF and BUFR formats, generated with the
new standard, will be made available shortly.
Contact Information for Further Information: David Donahue - Satellite Services Division, NOAA/NESDIS/OSPO/SPSD/SPB, (301) 683-3236
David.R.Donahue@noaa.govWeb Site(s) for applicable information: N/A
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