%0 conference paper,conference lecture,GKSS report %@ %A Ziemer, F.,Rosenthal, W.,Richter, K.,Schrader, D. %D 1992 %J ERS-1 Geophysical Validation: Workshop Proceedings %N %P 35-40 %T Two-dimensional wave field measurements as sea truth for ERS-1 SAR %U %X