image) grading 
hills south 
(3.0 cm) radar 
ber, 1975. 
Figure 5. 
Mangrove swamps, Gulf of San Miguel, Panama. Westinghouse 
bang (0.87 cm wavelength) radar image, 1967. The high 
speckled return enabled rapid discrimination of mangrove 
swamps throughout Darien Province. 
0 2 10 KM 
  
Figure 6. 
Coastal mangrove swamp (A) and rubber plantation (B) south of 
Rio del Rey, Cameroon. X-band radar image, 1977. A high 
return is characteristic of the mangrove swamps. The rubber 
plantation to the northeast is characterized by uniformly low 
return.