If false colors are assigned to certain isodensities an effective 

 bathymetric chart may be formed. After the region is viewed several 

 times, observations indicate that the transitory isodensities are 

 sediment and the permanent ones are bathymetric features. 



Photographs taken by the astronauts aboard Mercury, Gemini and 

 Apollo spacecraft have been confined to obvious unusual oceanic conditions 

 and to geographically limited flight paths. Thus, photographs of the 

 Gulf of California, northern Gulf of Mexico, Florida, and the Red Sea 

 abound, while the upwelled areas of Peru, and the fishing banks of 

 Newfoundland, Iceland, and the North Sea have not been photographed. 



The photographs that have been taken to date, however, provide a 

 wealth of material for study and must be examined carefully to derive 

 their total information. 



41 



