These products are provided by The Finnish Meteorological Institute (FMI) under Polar View project supported by ESA. BIM pages are showing only combination of ice thickness charts, where new and older SAR images are used. Thus the data can be 0-3 days old. Please check detailed information at polarview.fimr.fi.
An ice thickness chart is produced after a satellite-borne SAR image has been received, using the latest available routine ice chart as an input. The ice field boundaries are refined, and the thinnest and the thickest ice areas inside each ice chart segment are identified based on the SAR signal statistics. The resulting thickness chart is colour coded according to navigation restrictions based on ice thickness. The spatial accuracy of the resulting ice thickness charts is 500 meters. Currently, the ice thickness charts are based on the Radarsat-1 ScanSAR Wide Mode and Envisat ASAR Wide Swath images.