Table 1: Classification Thresholds and Relationship to Visible Oil Groups 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
    
  
  
  
DV SEACAST Hypothetical 
Threshold Image Thickness Oil Appearance 
Colour (um) 
> 7700 light grey 0.0 Ambient sea 
3000 <DV x 7700 mid-grey 0.08 Visible as silvery sheen (light oiling) 
s 3000 dark grey 2.0 Darker brown colours (heavy oiling) 
Radarsat NOAA 
Orbimage 
Customers : SAR | AVHRR ES/NOAA 
i imager : 
© aquaculture SeaWiFS gery imagery 
e fisheries imagery wind 
e coast guard data 
  
  
  
     
    
    
e spill response FTP site 
e coastal managers 
es) 
FTP site 
    
Seacast 
digital products 
   
  
  
   
  
  
  
  
image + 
wind data 
  
  
  
  
image 
processing/ 
modelling 
   
  
  
digital products 
  
  
  
  
  
  
  
  
  
   
Seacast 
  
  
  
Figure 5 Data Flow Diagram for the SEACAST System Showing Data Dissemination Over the Internet. 
432 Intemational Archives of Photogrammetry and Remote Sensing. Vol. XXXII, Part 7, Budapest, 1998 
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