<descriptor thcode="2"><thesaurus thcode="2" name="USGS Thesaurus" scope="Topics and methods of scientific study carried out by USGS, with product types, scientific disciplines, geologic time, and types of institutional structure and activities.  Broad and shallow, used to help people find scientific information." creator="U.S. Geological Survey" rights="Public domain" edition="2.0" date="2020-01-09" codetype="number" prefix="topic" uri="https://www2.usgs.gov/science/USGSThesaurus" tblname="term" nonpref="nonpref" relterm="relterm" root_code="1" contact="pschweitzer"><category><term thcode="25" code="29" name="distinct labels" parent="26" scope="Preferred labels (descriptor texts) are distinct within the thesaurus. A concept can be specified either by its unique identifier (code) or by the text of its descriptor."/><term thcode="25" code="16" name="hierarchical" parent="11" scope="Substantive broader-narrower relationships exist among the terms."/><term thcode="25" code="13" name="transitive" parent="12" scope="Narrower terms have an &quot;is a&quot; relationship with their broader terms, and generally can be described as part-of, type-of, or instance-of the broader term."/><term thcode="25" code="21" name="disciplines" parent="2" scope="Broad categories of human inquiry or activity, such as scientific disciplines."/><term thcode="25" code="20" name="methods" parent="2" scope="Actions taken to obtain or analyze information"/><term thcode="25" code="19" name="organizational functions" parent="2" scope="Things that organizations do, typically including various types of programs, projects, and services."/><term thcode="25" code="7" name="temporal" parent="2" scope="Terms indicate periods of time, such as chronostratigraphic units, named historical periods or intervals surrounding known historical events, or seasons."/><term thcode="25" code="5" name="theme" parent="2" scope="Terms indicate domains of human concern, such as scientific discipline, societal problems, or characteristics of earth, space, oceans, and living things."/><term thcode="25" code="29" name="distinct labels" parent="26" scope="Preferred labels (descriptor texts) are distinct within the thesaurus. A concept can be specified either by its unique identifier (code) or by the text of its descriptor."/><term thcode="25" code="16" name="hierarchical" parent="11" scope="Substantive broader-narrower relationships exist among the terms."/><term thcode="25" code="13" name="transitive" parent="12" scope="Narrower terms have an &quot;is a&quot; relationship with their broader terms, and generally can be described as part-of, type-of, or instance-of the broader term."/><term thcode="25" code="21" name="disciplines" parent="2" scope="Broad categories of human inquiry or activity, such as scientific disciplines."/><term thcode="25" code="20" name="methods" parent="2" scope="Actions taken to obtain or analyze information"/><term thcode="25" code="19" name="organizational functions" parent="2" scope="Things that organizations do, typically including various types of programs, projects, and services."/><term thcode="25" code="7" name="temporal" parent="2" scope="Terms indicate periods of time, such as chronostratigraphic units, named historical periods or intervals surrounding known historical events, or seasons."/><term thcode="25" code="5" name="theme" parent="2" scope="Terms indicate domains of human concern, such as scientific discipline, societal problems, or characteristics of earth, space, oceans, and living things."/></category><altlabel><altlabel>USGSThesaurus</altlabel><altlabel>USGSThesaurus</altlabel></altlabel></thesaurus><term thcode="2" 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."/><uf><usefor name="AVHRR images"><usewith><term thcode="2" code="74" name="AVHRR" parent="588" scope="Advanced Very High Resolution Radiometer or broad-band, four or five channel scanner, sensing in the visible, near-infrared, and thermal infrared portions of the electromagnetic spectrum. This information is used to estimate characteristics of the land and sea surface such as temperature and overall health of vegetation."/></usewith></usefor><usefor name="LIDAR images"><usewith><term thcode="2" 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."/></usewith></usefor><usefor name="Landsat images"><usewith><term thcode="2" 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."/></usewith></usefor><usefor name="aerial photographs"><usewith><term thcode="2" 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."/></usewith></usefor><usefor name="aerial photos"><usewith><term thcode="2" 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."/></usewith></usefor><usefor name="air photos"><usewith><term thcode="2" 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."/></usewith></usefor><usefor name="orthoimagery"><usewith><term thcode="2" 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."/></usewith></usefor><usefor name="orthophotographs"><usewith><term thcode="2" 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."/></usewith></usefor><usefor name="photographs"><usewith><term thcode="2" code="889" name="photography" parent="734" scope="Process of using digital or film cameras to collect images of objects."/></usewith></usefor><usefor name="pictures"/><usefor name="remote-sensing data"><usewith><term thcode="2" 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."/></usewith></usefor><usefor name="remote-sensing images"><usewith><term thcode="2" 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."/></usewith></usefor><usefor name="satellite images"><usewith><term thcode="2" 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."/></usewith></usefor><usefor name="scientists-at-work photographs"><usewith><term thcode="2" code="1020" name="scientific careers" parent="1174" scope="Professions in which people carry out or support scientific research or monitoring."/></usewith></usefor></uf><bt><term thcode="2" code="808" name="product types" parent="1" scope="General representation of the information in a resource, such as a map or data set."/><term thcode="2" code="1" name="Categories" scope="Thematic terms for categorizing information resources.  This thesaurus is intended to support finding and understanding scientific information."/></bt><nt><term thcode="2" code="2046" name="image mosaics" parent="575" scope="Composite images formed by overlapping existing images, typically arranged to achieve greater spatial coverage."/></nt></descriptor>