{"thcode":2,"term":{"code":2036,"name":"multibeam sonar","parent":1083,"scope":"Acoustic technique for determining depths or creating backscatter imagery in a wide swath of seafloor or lakebed centered below the instrument platform."},"uf":[{"name":"multi-beam","usewith":false},{"name":"multi-beam echo sounder","usewith":false},{"name":"multi-beam echosounder","usewith":false},{"name":"multi-beam sonar","usewith":false},{"name":"multibeam","usewith":false},{"name":"multibeam echo sounder","usewith":false},{"name":"multibeam echosounder","usewith":false}],"bt":[{"code":1083,"name":"sonar methods","parent":375,"scope":"SOund Navigation And Ranging techniques to detect submerged objects and to determine depths to the bottom of a water body using reflections of sound waves."},{"code":375,"name":"field inventory and monitoring","parent":376,"scope":"Repeated observation or sampling at a site, on a scheduled or event basis, for study and analysis.  In general, this category excludes sampling programs in which materials are obtained in the field and brought back to a laboratory for study and analysis."},{"code":376,"name":"field methods","parent":734,"scope":"Research procedures and instrumental means to measure, collect data and samples, and observe in the natural areas where the materials, phenomena, structures, or species being studied occur."},{"code":734,"name":"methods","parent":1,"scope":"Techniques, methods, procedures, or strategies for research, management, collection, or analysis of scientific information in USGS."},{"code":1,"name":"Categories","parent":null,"scope":"Thematic terms for categorizing information resources.  This thesaurus is intended to support finding and understanding scientific information."}],"nt":[],"rt":[{"code":80,"name":"bathymetry","parent":1176,"scope":"The elevation of the earth's surface beneath a body of water, especially the ocean, typically determined by measurements of depth from the water surface."},{"code":2091,"name":"lakebed acoustic reflectivity","parent":2090,"scope":"Acoustic energy received by a sonar system, providing a measure of the roughness of the lakebed."},{"code":2053,"name":"sea-floor acoustic reflectivity","parent":1025,"scope":"Acoustic energy received by a sonar system, providing a measure of the roughness of the sea floor."},{"code":1025,"name":"sea-floor characteristics","parent":810,"scope":"Geomorphic features and geographic, compositional, and textural variation in the materials composing the ocean floor. Includes both large-scale structures (such as seamounts and rises) and fine-scale variations in rocks and deposits on the sea floor."}]}