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The purpose of scanning profilers is to determine accurately the relationship between the pipe and the surrounding seabed , or if the pipe is buried , in conjunction with a pipetracker , the depth of burial of the pipe . Because of the inherent nature of their situation viewed as either adrift within society or outside of society altogether it is particularly difficult to determine accurately the extent of homeless youth in Australia , the causes of their homelessness and the true dimensions of their needs . Whereas there was a scientific basis for determining an individual 's minimum need for food , there was hardly any method to determine accurately the norms for non-food items .