{"thcode":2,"term":{"code":2086,"name":"continuous resistivity profiling","parent":326,"scope":"Ship-based method of analyzing apparent resistivity of the sub-bottom (for example, spatial variation in pore-water salinity) by measuring the induced electromagnetic response to a current generated by the instruments."},"uf":[{"name":"CRP profiling","usewith":false},{"name":"CRP surveying","usewith":false},{"name":"continuous resistivity surveying","usewith":false}],"bt":[{"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":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":2298,"name":"inverse modeling","parent":713,"scope":"An iterative approach to estimate the form and characteristics of a physical system explained by observations or measurements. Frequently used to determine a subsurface geological structure from measurements of physical properties obtained at or near the earth's surface."}]}