Abstract
FIMR has been utilizing the Radarsat-1 ScanSAR data in operational sea ice monitoring for several years. The surface scattering dominates the backscattering at C-band [1], but it is still possible to estimate ice thickness based on this surface roughness visible in SAR data in some areas of the Baltic Sea, because typical Baltic Sea drift ice becomes more and more deformed as it gets older and thicker, i.e. there is correlation between Baltic Sea ice surface roughness and thickness. For ship navigation in the Baltic Sea ice ridging is another important ice parameter, in addition to ice thickness. However, it is impossible to detect single ridges from our operational SAR data, Radarsat-1 ScanSAR Wide images in 100 m resolution. One ice parameter closely related to ridging is the equivalent deformed ice thickness (Tdef ). The total (mean over an area) ice thickness (T ) is the sum of the level ice thickness (Tlev) and equivalent deformed ice thickness: T = Tlev + Tdef . (1)
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