The synthetic aperture radar (SAR) on board the ERS-1
satellite has a 5.3 GHz radar frequency and a spatial resolution of approximately
30 m. The angle of incidence ranges between 
and 
. The satellite has
been operating since July 1991. In the following the appearance of open water,
grease ice, new ice and pancake ice in SAR images will be explained.
Tim Flintholm Fink<tff@emi.dtu.dk>