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
Processing level : L3
Satellite input : DMSP/SSMIS, Metop/ASCAT and GCOM-W/AMSR-2
Other input : ECMWF outputs
Frequency : 1 per day
Central time : 12:00
Timeliness : 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
Main Diffusion Means : HL FTP server, last 31 days (hosted by MET Norway) :
Archive HL FTP server :
Redistribution :


Other means :


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 :
  • 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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