{"thcode":2,"term":{"code":492,"name":"GPS measurement","parent":450,"scope":"Determination of distance and location using instruments receiving signals from the Global Positioning System, a system of satellites for identifying earth locations."},"uf":[{"name":"DGPS","usewith":false},{"name":"differential GPS","usewith":false},{"name":"global positioning measurement","usewith":false},{"name":"real-time kinematic navigation","usewith":false}],"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":445,"name":"geographic information systems","parent":587,"scope":"Computer software that allows geospatially referenced data to be linked to geographic features. Use this term only for information that is about GIS and not for the use of GIS in applications and projects."},{"code":447,"name":"geography","parent":291,"scope":"Study of the earth's landforms, topography, and climate, the distribution of flora and fauna, and the distribution, culture, and activities of human populations."},{"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."}]}