{"thcode":2,"term":{"code":222,"name":"CTD measurement","parent":375,"scope":"Instrumental determination of conductivity, temperature, and pressure as a function of depth to determine the salinity of seawater."},"uf":[],"bt":[{"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":657,"name":"limnology","parent":291,"scope":"Scientific study of the physical and biological characteristics of inland bodies of water such as lakes and ponds."},{"code":703,"name":"marine chemistry","parent":1298,"scope":"Branch of chemistry that deals with the properties, composition, structure, and interaction of substances in the seas and oceans."},{"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."}]}