contribution of thermal imagery in charting surface temperature and thereby 
indicating water qualities is also well established (cf. Figure 8). 
Synoptic views of sedimentation patterns in an estuary, or of tidal fronts and 
boundaries between zones of different water quality, are of immense value in 
understanding the processes of erosion and sedimentation, the dispersion of 
pollutants and the patterns of ocean current. The Arctic is an area of intense oil 
and gas exploration; engineering and ecological problems are immense and 
information and experience fall well short of what may be required if we should 
some day be confronted with an oil spill. However, among our information sources, 
   
  
  
  
   
   
   
  
  
FIGURE 8. Thermal infrared line scan imagery showing outflows of warm water é 9 
into a larger body of colder water. (Canada Centre for Remote 
Sensing).