{"thcode":2,"term":{"code":2083,"name":"LORAN-C navigation","parent":450,"scope":"Hyperbolic radio navigation system used for near-shore waters."},"uf":[],"bt":[{"code":450,"name":"geolocation measurement","parent":376,"scope":"Methods for establishing a geographic location on the surface of the earth."},{"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":2078,"name":"navigational data","parent":474,"scope":"Geospatial data indicating the locations of instruments, vessels, aircraft, or other vehicles used to collect scientific observations.  These data include horizontal coordinates in sequence, and may include time or vertical position."}]}