6 Wavelet Analysis of SAR Images in the Marginal Ice Zone
Day 21
-~-Day 24
2
Day 27
4
6
km
8
Fig.11. Summary of the results of matched floe framed with templates for days 21,24, and 27,1992,
near the polynya
Fig. 12. Floe edge elements
(small contours) obtained by
wavelet transform using a small
scale within the neighborhood
of the approximate boundary
obtained by wavelet transform
with a median scale. The small
contours are connected by the
center. The small contours are
connected by the center of mass
to construct the detailed shape
of the the ice floe.
125
the ice floe with sharp edges and corners is well delineated by this method. Based on
these detailed floe shapes, both translation and rotation of the floe can be estimated.
The floe speeds are approximately 0.32 mls from day 21 to day 24, and 0.26 mls from
day 24 to day 27. The rotations of the floe due to the shear through the opening of the
polynya are approximately 50 0 from day 21 to day 24 and 400 from day 24 to day 27.
Within 6 days, the floe moved approximately 150 km and rotated by 90 0 due to the
strong shear associated with the evolution of polynya as summarized in Fig. 9.