a.
I
J
0 - 3
)-1
I
.I
11O~
-
t
;
;
.t
Q-J
J-O
i-'
D -'
'-0 i - I . - 12
~
.. . .
.....
Fig.4. a-c. Determination of ice age distribution and thickness distribution in a grid cell extracted from the time sequence. a The image sequence showing
the deformation
of a grid cell. b Plot of area changes as a function of time, and age histograms computed from the area changes. c Plot of the freezing-degree
days
and the computed thickness of the ice. (1
Pixel
= 100
x 100
m
= 10 000
m 2
= unit area.) (ERS-l
images copyright ESA 1996)
N
t
(0
~
o
~