Global Low Resolution Sea Ice Drift

Operational Near real time product

Ice motion vectors with a time span of 48 hours are estimated by an advanced cross-correlation method (the Continuous MCC, CMCC) on pairs of satellite images. Several single-sensor products are available, along with a merged (multi-sensor) dataset.

Acronym : GBL LR SIDR
Product navigator reference :


OSI SAF producer : Norwegian Meteorological Institute
Identifier : OSI-405-c
Digital object identifier (DOI) 10.15770/EUM_SAF_OSI_NRT_2007
Acronym for EDC (APNM) : OSIDRGB
Citation : See at bottom
Processing level : L3
Satellite input : DMSP/SSMIS, Metop/ASCAT and GCOM-W/AMSR-2
Other input : ECMWF outputs
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. 6 h
Spatial coverage : Global
Spatial sampling : 62.5 km
Projection : Polar stereographic
File Formats : HL FTP Server (NetCDF3)
Characteristics & methods : Single and multi sensor analysis.
Displacement after 48 hours in km.
Data Access

OSI SAF FTP server (last 31 days)

Directory: ice/drift_lr/

OSI SAF FTP server (archive)

Directory: ice/drift_lr/

EUMETSAT Multicast

Redistribution by Copernicus Marine Service

Accuracy Requirements
Target accuracy : 5 km yearly std deviation on both x and y components after 48 hours displacement
Verification/validation method : Collocation with buoys
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 : 2009-onwards
Detailed history :

The product series is operational since 2009:

  • version OSI-405 from 2009 to 2015
  • version OSI-405-b from 2015 to 30/05/2017
  • version OSI-405-c from 30/05/2017 onwards
Citation : OSI SAF Global Low Resolution Sea Ice Drift, OSI-405-c, doi: 10.15770/EUM_SAF_OSI_NRT_2007. 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...
  • An new variable is introduced in the OSI-405-c NetCDF files : the product uncertainties. The new variable provides an uncertainty value (aka expected accuracy) for each grid location. In the case of OSI -405-c, the new variable holds the standard deviation of the uncertainty in the components of the ice drift displacement vectors.

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