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        Thesaurus Term/Concept: BATHYMETRIC SURVEY
        
            
                
                    | Identifier | 147268 | 
                
                    | Class | EVENT TYPE | 
                
                    | Status | Preferred | 
                
                    | Index? | Yes | 
                
                    | Scope Note | A maritime investigation that records depth data which can be used to map submerged topography utilising echo sounders which emit a short acoustic pulse. Depth is calculated by measuring the time taken for the pulse to be reflected back to the transducer. | 
            
        
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