{"thcode":2,"term":{"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."},"uf":[{"name":"baseline characterization","usewith":false},{"name":"field monitoring","usewith":false},{"name":"field observation","usewith":false},{"name":"inventory","usewith":false},{"name":"ocean current measurement","usewith":{"code":814,"name":"ocean currents","parent":816,"scope":"Recurrent strong flows of seawater generated by wind or variations in water density along a given path."}},{"name":"ocean monitoring","usewith":{"code":810,"name":"ocean characteristics","parent":287,"scope":"The attributes and process of seas and oceans."}},{"name":"ocean wave measurement","usewith":{"code":822,"name":"ocean waves","parent":816,"scope":"A periodic movement of seawater caused by wind, tide, and currents."}},{"name":"precipitation measurement","usewith":{"code":927,"name":"precipitation (atmospheric)","parent":63,"scope":"Any or all forms of water particles that fall from the atmosphere, such as rain, snow, hail and sleet."}},{"name":"rainfall measurement","usewith":{"code":927,"name":"precipitation (atmospheric)","parent":63,"scope":"Any or all forms of water particles that fall from the atmosphere, such as rain, snow, hail and sleet."}},{"name":"reconnaissance","usewith":false},{"name":"river discharge monitoring","usewith":false},{"name":"snowfall measurement","usewith":{"code":927,"name":"precipitation (atmospheric)","parent":63,"scope":"Any or all forms of water particles that fall from the atmosphere, such as rain, snow, hail and sleet."}},{"name":"volcano monitoring","usewith":{"code":1286,"name":"volcanic activity","parent":451,"scope":"Episodes during which gases, ash, and lava (molten rock) escape from vents in the earth's crust, accompanied by minor tremors."}},{"name":"weather monitoring","usewith":{"code":63,"name":"atmospheric and climatic processes","parent":101,"scope":"Phenomena affecting or occurring within the mass of gases that surrounds the earth, including its physics, chemistry, dynamics, and weather conditions."}},{"name":"weather observations","usewith":{"code":63,"name":"atmospheric and climatic processes","parent":101,"scope":"Phenomena affecting or occurring within the mass of gases that surrounds the earth, including its physics, chemistry, dynamics, and weather conditions."}}],"bt":[{"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":[{"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."},{"code":1726,"name":"acoustic doppler current profiling","parent":375,"scope":"Field monitoring of water currents using the doppler effect with acoustic instruments."},{"code":1353,"name":"animal and plant census","parent":375,"scope":"Inventory of macroscopic animals and plants by observation in the field. Used to estimate population and distribution."},{"code":125,"name":"borehole logging","parent":375,"scope":"Method of recording the physical characteristics of the subsurface as a function of depth by observations during drilling of a well or borehole, studying the resulting core, or by lowering instruments into a drilled hole."},{"code":317,"name":"ecosystem monitoring","parent":375,"scope":"Recording, evaluating, and actively intervening over time in the interaction of living and nonliving elements in a specific environment."},{"code":326,"name":"electromagnetic surveying","parent":375,"scope":"Method of determining the shape and constituency of near-surface earth structures by variations of responses of the materials to electrical and magnetic fields. Use for ground-based methods of imaging."},{"code":1359,"name":"field monitoring stations","parent":375,"scope":"Locations where USGS scientists or their collaborators make measurements of natural phenomena."},{"code":1668,"name":"gravimeter measurement","parent":375,"scope":"Use of a specialized instrument for measuring the earth's gravity at a given location."},{"code":527,"name":"handheld field spectroscopy","parent":375,"scope":"Use of portable equipment to measure spectral reflectance of materials in the field."},{"code":1669,"name":"magnetometer measurement","parent":375,"scope":"Use of specialized instruments designed to measure the earth's magnetic field at a given location."},{"code":378,"name":"monitoring networks","parent":375,"scope":"An aggregation of field monitoring stations that fulfill a common purpose"},{"code":1672,"name":"optical methods","parent":375,"scope":"Measurement of light transmission or reflectance in the field to estimate, for example, the density of suspended sediment in water bodies."},{"code":1042,"name":"seismic methods","parent":375,"scope":"Procedures used to record and study earthquakes or earth vibrations including those that are artificially induced."},{"code":1083,"name":"sonar methods","parent":375,"scope":"SOund Navigation And Ranging techniques to detect submerged objects and to determine depths to the bottom of a water body using reflections of sound waves."},{"code":2024,"name":"statistical surveying","parent":375,"scope":"Information gathering by asking questions of selected people or organizations."},{"code":1116,"name":"stream-gage measurement","parent":375,"scope":"Use of specialized instruments designed for observing, checking, and recording the water discharge that occurs in a natural channel."},{"code":1148,"name":"telemetry","parent":375,"scope":"Field technique using instruments which measure heat, radiation, speed, or other property and transmit the data to a distant receiver."},{"code":1169,"name":"tiltmeter measurement","parent":375,"scope":"Determination of tiny changes in the slope angle or tilt of the ground in order to monitor deformation caused by moving magma. Instruments detect variations in a liquid level or in the position of a pendulum."},{"code":1716,"name":"tomography","parent":375,"scope":"Observation of the internal structure of an object or, as is more typical in USGS research, a cross section of the earth's crust by changing the relative orientation of a signal generator, a sensor, or both."},{"code":1273,"name":"video monitoring","parent":375,"scope":"Field study employing the use of filming or repeated photography with stationary optical or digital cameras to observe changes in a feature or organism."},{"code":1285,"name":"vocalization methods","parent":375,"scope":"Series of methods used to (a) record sonograms (sound spectrogram) of animal sounds which are analyzed to identify the presence of species in an area and to determine distinct sound patterns within a species, e.g., mating calls, danger alerts; (b) attract species to an area for inventory or monitoring by playing recorded animal sounds or mimicking them."}],"rt":[{"code":370,"name":"faunal and floral census (microscopic)","parent":619,"scope":"Records of counts of the different microscopic species in a core, soil, sediment, rock or water sample to determine geologic age or other characteristic of the sample.  Use for microscopic examinations."}]}