4 Extraction of Intermediate Scale Sea Ice Deformation Parameters from SAR Ice Motion Products
77
Fig. 4. The input and output
marking panels of the edge
point trimmer from the ASF ice
motion product 1131010 which
is generated from image
4535401 (Julian day 285, 1991)
and image 4620401 (Julian day
288,1991) for an area centered
at 81°N, 172 0 42'W
4.3.3
The Gap Filler
The input marking panel before edge point trimming, where the 2's in
italics indicate edge points that will be nimmed by the trimming
procedure.
I I I I I I I I I I I I
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21 21 I I I I
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21 21 I 21 I I 21 I 21 I
I I I I 21 I 21 21 21 II II II I II II I II I 21 I
21 I I I II I 11 11 II I II II II II II II II 21 I I
21 II I II I II I II II I II II II II II II II 21 I I
2 II I II I II II II II II II II II 11 II II II 21 I I
I II I II II II II II II II II II II II II II II 1 21
21 II II II II II II II II II II II II II \I 11 II I I
21 11 \I II II II 11 II II \I II II II II \I 11 II I I
21 11 II II II II \I II II II II II II 11 II II II II I
I 21 II II II II \I 11 II II \I 11 11 11 II 11 II II I
I 21 II II 11 1 II II I II 11 11 11 11 II II II II I 21
I 21 II II 11 11 II 11 II 11 II 11 11 11 II II II 11 II I
I 21 II II II II II II II 11 II 11 II II II II II II II I
I 21 II 11 II 11 II II I I II II 11 II II II II II II II I
11211111111111 111111 II 1111111121212121
I I 21 II II II II II II 11 II 21 21 21 21 21 I I I I
I I 21 Jill 21 21 21 21 21 21 I I I
I I I
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I I I 21 21 I I I I I I
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I I I
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I I I I I I I I I I I I I I
I
The output marking panel after edge point trimming
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I
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I
I
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11 II 11 I 11 11
II I I
I
I I I II I II II 11 I II 11 11 11 11
II I I
I
II 1 II I II 1 II II I II 11 II II 11
II I I
I
I
I II I II II 11 II II 11 II II 11 11
II I I
I
11 I II 11 11 11 11 11 II II II II 11
II 11 I
I
11 II II 11 11 II 11 11 11 11 II 11 11
II 11 I
I
II 11 II 11 II II 11 11 II 11 II 11 II
11 I I I
I
II II II II II \I 11 \I II \I II II 11
11 II II
I
I II II II 11 11 11 II II II 11 II II
II II II
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I II II 11 I II II I II II 11 11 II 11 11 II 11
I
I 11 11 II II II 11 II II II II II 11 II II II II 11
I
I II II II II II II 11 11 II 11 II 11 II 11 II \I 11 I I
I II II II II
II II II II 11 II II 11 11 II II 11 11 I I
I I \I \I \I II 11 11 II 11 II 11 II 11 11 I I I I I
I I II \I \I II 11 II 11 II I I I I I I I I I I
I I II II I I I I I I I I
I I I I I I I I
I I I I I I I I I I I I I
I I I I I
I I
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I I
Next, a 2-D template characterizing the data availability is produced. On this template,
all the tie points where ice motion data are available are flagged with the integer value
of 1. In addition, all the grid points representing background points as well as the edge
points which have already been deleted are marked with "0:' as are all the interior gaps.
It is commonly found that wherever the ice undergoes very large, complex deformations, ice motion data can be missing. The gap fllier estimates the ending positions of
the missing ice motion vectors.
Initially, the linear interpolation is made along the rows and then along the columns
for gap filling. The interpolation results are then further smoothed until the value at