102
Fig. 6. ERS-l SAR
frame number 1719
from September 12,
1991 (Julian day
255) . (Copyright
1991 ESA, reprinted
from Beaven et aI.
1996)
Fig. 7. ERS-l SAR
frame number 1737
from September 22,
1991(Julian day 265).
(Copyright 1991
ESA, reprinted from
Beaven et al. 1996)
12 Seplember Frame 1719
S.G. BEAVEN AND S.P. GOGINENI
sigma noughl
o
-2
_ 4
-6
-8
o
-2
the Polar Star for semiquantitative assessment of the combined active and passive estimates of ice concentration. We also used SAR images from August 30 (Julian day 242,
frame 1701) and September 22 (Julian day 265,frame 1737) to test the hybrid fusion technique. The image obtained from September 22 has about 30% overlap with frame 1719
from September 12, and the image from August 30 is just south and west of these frames,
within 50 km of the IAOE cruise track.
These images were thresholded using the DLT algorithm and an example of the
resulting classified image is shown in Fig. 8. Of the three classes separated by the thresholding technique we determined which type is most likely multiyear ice (shown in red)
Fig. 6. ERS-l SAR
frame number 1719
from September 12,
1991 (Julian day
255) . (Copyright
1991 ESA, reprinted
from Beaven et aI.
1996)
Fig. 7. ERS-l SAR
frame number 1737
from September 22,
1991(Julian day 265).
(Copyright 1991
ESA, reprinted from
Beaven et al. 1996)
12 Seplember Frame 1719
S.G. BEAVEN AND S.P. GOGINENI
sigma noughl
o
-2
_ 4
-6
-8
o
-2
the Polar Star for semiquantitative assessment of the combined active and passive estimates of ice concentration. We also used SAR images from August 30 (Julian day 242,
frame 1701) and September 22 (Julian day 265,frame 1737) to test the hybrid fusion technique. The image obtained from September 22 has about 30% overlap with frame 1719
from September 12, and the image from August 30 is just south and west of these frames,
within 50 km of the IAOE cruise track.
These images were thresholded using the DLT algorithm and an example of the
resulting classified image is shown in Fig. 8. Of the three classes separated by the thresholding technique we determined which type is most likely multiyear ice (shown in red)