该文选取NOAA卫星连续5天晴空图象序列,用相关-张弛-(C-R)法和泛函分析法(FAM)计算了辽东湾海冰运动速度矢量场。在运用这些方法之前,利用地标点和最大互相关方法对图象序列进行精确配准,为了消除非运动因素引起的图象灰度变化对于FAM计算结果的影响,对图象序列采用了一种简单的均衡化处理。研究结果表明,C-R和FAM两种算法计算的海冰运动在总体趋势上是一致的,并且与辽东湾局地平均风场和潮汐活动有较好的对应关系。

Currently the modified maximun cross correlation (Correlation-Relaxation) method and the functional analysis method (FAM) are used to study displacement vector fields of sea ice in the Liaodong Bay of China, from NOAA satellite image sequences of continuous five clear days. Before using these algorithms several preprocessing steps, such as image registration, calibration, as well as land and water masks, are performed. Particularly, two kinds of normalization methods for the image sequence are tested in order to eliminate non-advective effect on the FAM calculations. The calculated results for the C-R method and the FAM are quite homogeneous and show distinct patterns in displacement vector fields. Both results are well explained by wind and tide data, which demonstrate that the time averaged winds and the residual tidal activity are responsible for the displacement of sea ice deduced from time lapsed images.