Global Sea Ice Type

Operational Near real time product

Ice classes are assigned from atmospherically corrected SSMIS and AMSR-2 brightness temperatures and ASCAT backscatter values, using a Bayesian approach. Both the sea ice edge product and the sea ice type product are classification products differing between different ice classes. Sea ice type differs between First-year ice and Multiyear ice which are defined from target regions of known ice types. The product series is operational since 2005.

Acronym : GBL SITY
Product navigator reference :


OSI SAF producer : Norwegian Meteorological Institute
Identifier : OSI-403-d
Digital object identifier (DOI) 10.15770/EUM_SAF_OSI_NRT_2006
Acronym for EDC (APNM) : OSITYGBN
Citation : See at bottom
Processing level : L3
Satellite input : DMSP/SSMIS, GCOM-W/AMSR-2 and Metop/ASCAT
Other input : ECMWF forecast for atmospheric correction
Temporal sampling : 1 per day
Central time : 12:00
Timeliness : ? The timeliness is the time elapsing from the sensing time of the last contributing file to the product dissemination to users. It is similar to the latency. 5 h
Spatial coverage : global
Spatial sampling : 10 km
File Formats : HL FTP Server (NetCDF4), EDC (NetCDF4), EUMETCast (NetCDF4)
Characteristics & methods : Discrimination First year, Multi year.
Multisensor analysis, daily average. Risk mitigation against sensor degradation.
Data Access

OSI SAF FTP server (last 31 days)

Directory: ice/type/

OSI SAF FTP server (archive)

Directory: ice/type/

EUMETSAT Multicast

Redistribution by Copernicus Marine Service

Accuracy Requirements
Target accuracy : 100000 km2 monthly in difference from running mean
Verification/validation method : Compare multi-year area with 11-days running mean.
Applications and users
Usage : NWP and Ocean/Ice models, operational Met and Sea Ice services.
Authorised to be operational / released :
Declared operational / released since :
On EUMETCast since :
On EDC since :
On FTP server since :
First date :
Full series temporal coverage : 2005-onwards
Detailed history :

The product series is operational since 2005 :

  • version OSI-403 from 2005 to 15/09/2015
  • version OSI-403-b from 15/09/2015 to 30/05/2017
  • version OSI-403-c from 30/05/2017 to 03/06/2021
  • version OSI-403-d since 03/06/2021
Citation : OSI SAF Global Sea Ice Type, OSI-403-d, doi: 10.15770/EUM_SAF_OSI_NRT_2006. EUMETSAT Ocean and Sea Ice Satellite Application Facility. Data extracted from [distributor/distribution mean]: ([extracted period],) ([extracted domains],) accessed [download date]

The content within square brackets "[…]" is to be replaced with whatever distributor, period, domain or download date is relevant to the data being used. The "extracted period" and "extracted domains" are only needed if a subset of the data is being used.
Suggestions for "distributor/distribution mean": OSI SAF FTP server/the EUMETSAT Data Centre/EUMETCast/name and URL of a redistributor...
  • ​Introducing for the first time Sea Ice Type for the Southern Hemisphere

  • Using Metop-B and -C, instead of Metop-A and -B (in OSI-402-c)

  • ​Switching from NetCDF3 to NetCDF4 as product format

  • ​Introducing associated uncertainty fields. The uncertainty field replaces the previous ‘confidence level” variable which will disappear. The confidence level can be reconstructed from the new uncertainty variable.

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