{"thcode":2,"term":{"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."},"uf":[{"name":"ocean bottom characteristics","usewith":false},{"name":"sea floor characteristics","usewith":false},{"name":"seafloor characteristics","usewith":false}],"bt":[{"code":810,"name":"ocean characteristics","parent":287,"scope":"The attributes and process of seas and oceans."},{"code":287,"name":"earth characteristics","parent":1174,"scope":"The measurable, definable properties and features of the earth."},{"code":1174,"name":"topics","parent":1,"scope":"Themes, subjects, and concerns for which USGS information resources are relevant."},{"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":[{"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."}],"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":2037,"name":"interferometric 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."},{"code":626,"name":"land surface characteristics","parent":287,"scope":"Features and attributes of earth's land surface."},{"code":706,"name":"marine geology","parent":464,"scope":"Branch of geology concerned with the composition, geologic history, and earth processes of the ocean floor and the continental margin."},{"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."},{"code":818,"name":"ocean sciences","parent":291,"scope":"Sciences involved in the study of geological, biological, chemical, and physical characteristics and processes of the oceans."},{"code":824,"name":"oceanic lithosphere","parent":667,"scope":"The solid outer zone of the earth, covered by seawater, and comprised of the crust and the upper layer of the mantle."},{"code":2038,"name":"sidescan sonar","parent":1083,"scope":"Acoustic technique for creating oblique backscatter imagery of the seafloor or lakebed."}]}