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02 July 2013

OSI SAF SST products in NetCDF GDS V2

Following the OSISAF Steering Group approval, the operationnal OSISAF low earth orbit SST product in netCdf format will change from GDS v1 to GDS v2 on 4th july 2013.

This change is requested by the GRHSST community; its main impact is the compression mode which will be internal instead of external with bzip.

The modification is based on the GDS v2 document available on the GHRSST web site : https://www.ghrsst.org/documents/q/category/gds-documents/operational/GDS20r5.pdf

In order for the users to anticipate this switch, a test period is scheduled starting 04/06/2013 afternoon.

  1. For EUMETCast users, some MGR SST test files will be available on a EUMETSAT ftp server : ftp://ftp.eumetsat.int/pub/EUM/out/OPS/User/OSI-SAF_MGRSST_Test_Files/ Note that the filename will be modified following the example below : from S-OSI_-FRA_-MTOP-MGRSST_FIELD-201305211228Z.nc.bz2 to S-OSI_-FRA_-MTOP-MGRSST_FIELD-201305211228Z.nc
  2. For IFREMER users, MGR, NAR and GLB SST GDSV2 products will be sent in parallel during one month with the ones in GDSV1 format, and available in the same directory. Note that with the change to the GDS v2 format, the filenames will be different, following the example below.

GDSV1 filenames :

20130521-EUR-L2P_GHRSST-SSTsubskin-AVHRR_METOP_A-eumetsat_sstmgr_metop02_20130521_121 903-v01.7-fv01.0.nc.bz2
20130521-EUR-L3P_GHRSST-SSTsubskin-NAR_AVHRR_NOAA_19-eumetsat_sstnar_noaa19_20130521_ 030000-v01.7-fv01.0.nc.bz2
20130520-EUR-L3P_GHRSST-SSTsubskin-NAR_AVHRR_METOP_A-eumetsat_sstnar_metop02_20130520 _200000-v01.7-fv01.0.nc.bz2
20130521-EUR-L3P_GHRSST-SSTsubskin-GLOB_AVHRR_METOP_A-eumetsat_sstglb_metop02_2013052 1_000000-v01.7-fv01.0.nc.bz2

GDSV2 filenames :

20130521121903-OSISAF-L2P_GHRSST-SSTsubskin-AVHRR_SST_METOP_A-sstmgr_metop02_20130521 _121903-v02.0-fv01.0.nc
20130521030000-OSISAF-L3C_GHRSST-SSTsubskin-AVHRR_SST_NOAA19_NAR-sstnar_noaa19_201305 21_030000-v02.0-fv01.0.nc
20130520200000-OSISAF-L3C_GHRSST-SSTsubskin-AVHRR_SST_METOP_A_NAR-sstnar_metop02_2013 0520_200000-v02.0-fv01.0.nc
20130521000000-OSISAF-L3C_GHRSST-SSTsubskin-AVHRR_SST_METOP_A_GLB-sstglb_metop02_2013 0521_000000-v02.0-fv01.0.nc

The date of the operationnal switch to GDSV2 is planned on 04/07/2013.