FIGURE 6. Oblique aerial photograph of tundra showing part of a caribou herd 
anxious to leave the area to left. (National Film Board of Canada). 
  
FIGURE 7. An oil slick in Halifax harbour photographed at a flying height of 300 m 
e 9 with an aerial camera (left) and displayed to the operator during the 
flight on a television monitor (right). Note that a power boat has just 
passed through the slick. (Environmental Protection Service, Department 
of the Environment).