Chemistry Reference
In-Depth Information
Table 1.
The parameters related with the SAR image acquisitions, environmental
conditions and oil spills
Date of SAR survey,
1991
Aug. 22
Aug. 23
Aug. 25
Aug. 27
Satellite
ERS-1 Almaz-1 Almaz-1 ERS-1 Almaz-1 Almaz-1
Time, UTC
10:48
16:41
10:35
10:48
10:44
15:30
Incidence angle >deg@
23
35
27.4
23
52.6
35.3
Resonant surface
wavelength >cm@
8.4
7.3
10.4
7.3
6.0
8.3
Wind speed >m s
-1
@
5-7
2-3
7
2-3
12
Wind direction >deg@
190-200
170
200-240
220-230
Wave period >s@
9.5
9.5
7.9
12.5
245
260
305
265
Wave direction >deg@
2.8
2.8
1.7
3.1
Wave height >m@
spill of
August
21
16
22
40
88
Spill age
>hr@
spill of
August
24
18
72
spill of
August
21
a1.2
2.5
2.2
9.5
a0.2
Damping
ratio >dB@
spill of
August
24
15
a0.2
2.5
The standard SAR image processing which allows to delineate the proc-
esses on sea the surface includes, in particular, image section and NRCS
contrast estimation. The wave damping ratio (the ratio of the spectral den-
sities of Bragg waves (
S
) with wave number
k
or the normalised radar
cross section (NRCS) (V
0
) of spill-free and spill-covered sea surface) or
contrast:
K
S
(
k
)
S
(
k
)
V
V
(1)
sl
0
0
,
sl
