<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="808" name="product types" parent="1" scope="General representation of the information in a resource, such as a map or data set."/><bt><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="1740" name="animations" parent="808" scope="Graphical representation of scientific data presented as a timed sequence of visual images, normally without sound."/><term thcode="2" code="148" name="catalogs and indexes" parent="808" scope="Detailed enumeration of related items listed in a given order, or alphabetical lists of topics used for information retrieval."/><term thcode="2" code="235" name="datasets" parent="808" scope="Digital information in a format suitable for direct input to software that can analyze its meaning in the scientific, engineering, or business context for which the data were collected."/><term thcode="2" code="2077" name="field activity logs" parent="808" scope="Operational records for observation, inventory, sampling, or monitoring activities."/><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."/><term thcode="2" code="700" name="maps and atlases" parent="808" scope="Representation, usually on a flat surface, of a part or whole of the Earth or other parts of the universe.  Collections of maps linked digitally or bound together in a book are called atlases."/><term thcode="2" code="1729" name="materials standards" parent="808" scope="Physical materials such as chemicals, rocks, water, or biological materials that are used for reference when carrying out laboratory analysis."/><term thcode="2" code="1349" name="official communications" parent="808" scope="Corporate releases of information by USGS not generally intended to document the details of scientific data or techniques for a scientific audience."/><term thcode="2" code="924" name="posters" parent="808" scope="Large single sheets of paper or board imprinted with informative text and graphics. Intended for hanging or flat display."/><term thcode="2" code="1738" name="presentation materials" parent="808" scope="Diagrams, photos, and text gathered together as part of a presentation given in a meeting or class."/><term thcode="2" code="277" name="reports" parent="808" scope="Written items, especially those that are official, factual, or informative, often including graphics as well as text."/><term thcode="2" code="1077" name="scientific software" parent="808" scope="Routines, programs, and procedures devised in order to direct computers to perform specific tasks."/><term thcode="2" code="1739" name="sound recordings" parent="808" scope="Information presented in a format for listening by the user."/><term thcode="2" code="1744" name="terminologies and classifications" parent="808" scope="Collections of terms often including definitions or scope notes, with some stated relationships among terms"/><term thcode="2" code="1350" name="videos" parent="808" scope="Animation or other motion pictures, including videotape and DVD products."/></nt></descriptor>