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Fig. 4. Upper row:
SIR-C/X-SAR images of the same spot of the Baltic Proper
acquired during the first shuttle mission on April 16
th
, 1994, and showing signa-
tures of a mineral oil spill (image dimensions 8 by 7 km). The images were ac-
quired at L-, C-, and X-band (from left to right), VV-polarisation. On the
bottom
right
, damping ratios obtained from SIR-C/X-SAR images of various mineral oil
spills at low to moderate wind speeds (< 7 m s
-1
) are shown. Diamonds, circles,
and triangles denote HH, VV, and HV/VH polarisation, respectively
4 Statistical Analysis of ERS SAR Data
Gade et al. (2000) analysed more than 700 ERS SAR images of European
marginal waters (acquired between December 1996 and November 1998
over the Baltic Sea, the North Sea, and the northwestern Mediterranean
Sea) with respect to the detectability of marine oil pollution. Model wind
speeds provided by the Deutscher Wetterdienst (DWD, German Weather
Service) were used to get an estimate of the influence of the mean local
meteorological conditions (namely of the wind speed) on the overall de-
tectability of marine oil pollution. The model results for the three test ar-
eas, each for the entire period of SAR image acquisition (December 1996
until November 1998), are shown in Figure 5. The upper row contains the
values calculated for the summer periods (April - September) and the
