{"thcode":2,"term":{"code":981,"name":"remote sensing","parent":734,"scope":"Acquiring information about a natural feature or phenomenon, such as the Earth's surface, without actually being in contact with it. USGS remote sensing is usually carried out with airborne or spaceborne sensors or cameras."},"uf":[{"name":"airborne imaging","usewith":false},{"name":"composite burn index","usewith":{"code":1378,"name":"fire damage","parent":522,"scope":"Destruction of surficial materials and vegetation by burning."}},{"name":"normalized burn ratio","usewith":{"code":1378,"name":"fire damage","parent":522,"scope":"Destruction of surficial materials and vegetation by burning."}},{"name":"photogrammetry","usewith":false},{"name":"remote-sensing data","usewith":{"code":575,"name":"image collections","parent":808,"scope":"Visible representations of objects or earth properties produced by cameras, spectral instruments, or as graphical representations of measurements."}},{"name":"remote-sensing images","usewith":{"code":575,"name":"image collections","parent":808,"scope":"Visible representations of objects or earth properties produced by cameras, spectral instruments, or as graphical representations of measurements."}},{"name":"satellite altimetry","usewith":{"code":36,"name":"altimetry measurement","parent":450,"scope":"The measurement of altitude, or height above mean sea level, using instruments such as aneroid barometers and radar altimeters."}},{"name":"satellite images","usewith":{"code":575,"name":"image collections","parent":808,"scope":"Visible representations of objects or earth properties produced by cameras, spectral instruments, or as graphical representations of measurements."}},{"name":"satellite imaging","usewith":false},{"name":"space-borne sensing","usewith":false}],"bt":[{"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":571,"name":"IFSAR","parent":981,"scope":"Interferometric comparison of radar reflectance imagery of the same area at different times to determine changes in the land surface, typically from a space-borne sensor."},{"code":15,"name":"aerial photography","parent":981,"scope":"The process of taking pictures with a camera from an aircraft. Use for both the process of photography from the air and the images produced by the process."},{"code":18,"name":"aeromagnetic surveying","parent":981,"scope":"Mapping of the earth's magnetic field with the use of airborne electronic magnetometers."},{"code":19,"name":"aeroradiometric surveying","parent":981,"scope":"Mapping of gamma radiation from the earth's surface with airborne scintillation meters or gamma-ray spectrometers."},{"code":563,"name":"hyperspectral imaging","parent":981,"scope":"Multispectral imaging technique that records many bands of imagery at very narrow bandwidths."},{"code":588,"name":"infrared imaging","parent":981,"scope":"Method of remote sensing in which optical sensors produce visible representations of infrared rays or radiated heat from the observed objects and the temperature variations are represented by different colors in the image."},{"code":648,"name":"lidar","parent":981,"scope":"Light detection and ranging, an airborne, spaceborne or ground-based laser-ranging technique commonly used for acquiring high-resolution topographic data."},{"code":742,"name":"microwave imaging","parent":981,"scope":"Remote sensing method using short high frequency electromagnetic waves reflected or radiated from the ground."},{"code":765,"name":"multispectral imaging","parent":981,"scope":"A method of remote sensing that obtains optical representations in two or more ranges of frequencies or wave lengths."},{"code":867,"name":"panchromatic imaging","parent":981,"scope":"Photographic technique which uses emulsions, films, or plates sensitive to all colors in light to produce black-and-white photographs. Often used in aerial and satellite photography."},{"code":948,"name":"radar imaging","parent":981,"scope":"A remote sensing technique which uses the reflection of pulsed high frequency radio waves to determine the speed, direction, and distance of faraway objects."},{"code":1161,"name":"thermal imaging","parent":981,"scope":"Remote sensing techniques using instruments to measure emitted thermal radiation to form images of the earth's surface."},{"code":1281,"name":"visible light imaging","parent":981,"scope":"Remote sensing methods using electromagnetic radiation which is visible to the human eye to react with the coating on a photographic plate or film."}],"rt":[{"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":2291,"name":"gravity gradient","parent":501,"scope":"Lateral variation of the three-dimensional vector components of gravity, typically measured using airborne sensors."},{"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":2265,"name":"structure from motion","parent":574,"scope":"Mathematical analysis, using photogrammetric principles, of multiple images that depict the same subject from different angles to derive geometrical information and relationships in three-dimensional space that are not inherent in any single image. Often used for deriving land elevation or large scale orthoimagery from a collection of aerial photographs."},{"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":1276,"name":"videography","parent":734,"scope":"The process of recording and editing analog or digital video."}]}