{"thcode":2,"term":{"code":2264,"name":"water column reflectivity","parent":1304,"scope":"A measure of the strength of reflection from small particles suspended in water. It is usually measured by sending a pulse of sound or light through the water and measuring the sound or light that is returned. Water column reflectivity can be used to measure the concentration of suspended particles."},"uf":[{"name":"backscatter (water column)","usewith":false},{"name":"water column acoustic reflectivity","usewith":false},{"name":"water column optical reflectivity","usewith":false}],"bt":[{"code":1304,"name":"water properties","parent":1174,"scope":"Measurable physical and chemical characteristics of water from different sources."},{"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":[],"rt":[{"code":810,"name":"ocean characteristics","parent":287,"scope":"The attributes and process of seas and oceans."},{"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."}]}