{"thcode":2,"term":{"code":281,"name":"drilling and coring","parent":379,"scope":"Cutting into the subsurface, for example into underground strata, ice, or a tree trunk, to remove material for examination. Intended for broad use wherever coring is done. The combination of this term with other terms will convey the context of the activity."},"uf":[{"name":"core sampling","usewith":false},{"name":"coring","usewith":false},{"name":"ice core sampling","usewith":{"code":1072,"name":"snow and ice cover","parent":287,"scope":"Accumulation of snow or ice blanketing land surfaces."}}],"bt":[{"code":379,"name":"field sampling","parent":376,"scope":"Collecting pieces or specimens or making measurements or observations at determined intervals or areas.  Results may be used as representative of the whole research area or population."},{"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":2063,"name":"augering","parent":281,"scope":"Use of a device with rotating blades and possibly helical flanges to dig holes in unconsolidated material for subsurface sampling."},{"code":2060,"name":"box coring","parent":281,"scope":"Use of a rectangular box pushed into soft sediment with a spade to facilitate lifting the sampled material, to isolate and extract relatively undisturbed underwater sediment."},{"code":2061,"name":"gravity coring","parent":281,"scope":"Use of a simple tube pushed into underwater sediments by an overhanging weight, to extract relatively undisturbed material for study."},{"code":2062,"name":"piston coring","parent":281,"scope":"Use of a piston mechanism and a weight with a triggering mechanism to drive a coring tube deep into underwater sediments for extraction and study."},{"code":2064,"name":"push coring","parent":281,"scope":"Use of a small, hand-held tube pressed into unconsolidated material for sampling."},{"code":2065,"name":"rotary drilling","parent":281,"scope":"Use of machinery to drive a rotating bit through earth materials in order to sample below the surface."},{"code":2066,"name":"vibracoring","parent":281,"scope":"Application of vibration to a coring device in order to achieve greater penetration for sampling unconsolidated material."}],"rt":[{"code":127,"name":"botany","parent":650,"scope":"The science of plants."},{"code":212,"name":"core analysis","parent":619,"scope":"Study of the composition and layers of cylindrical samples of rocks, trees, ice, and other materials extracted by drilling into a mass. Intended for broad use for the analysis of all types of core samples. The combination of this term with other terms will convey the context of the activity."},{"code":464,"name":"geology","parent":291,"scope":"Study of the planet earth, its composition, structure, physical and chemical processes, and history since its origin."},{"code":484,"name":"glaciology","parent":291,"scope":"Science dealing with the features, origins, processes, and properties of snow, ice, glaciers, and ice sheets."},{"code":1325,"name":"well drilling","parent":775,"scope":"The process of artificial excavation for the purpose of withdrawing water, oil, or gas from underground."}]}