<descriptor thcode="61"><thesaurus thcode="61" name="Marine Realms Information Bank (MRIB) keywords" scope="Theme keywords from the former Marine Realms Information Bank, focusing on characteristics of coasts and oceans, processes acting on them, and human concerns about them." creator="U.S. Geological Survey" rights="Public domain" date="2016-09-07" codetype="number" prefix="mrib" tblname="mrib" nonpref="mribnp" relterm="mribrt" root_code="1" contact="aallwardt"><category><term thcode="25" code="27" name="types" parent="26" scope="Terms are types of things rather than named instances"/><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="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="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="27" name="types" parent="26" scope="Terms are types of things rather than named instances"/><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="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="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"/></category><altlabel><altlabel>MRIB keywords</altlabel><altlabel>MRIB keywords</altlabel><altlabel>Marine Realms Information Bank keywords</altlabel><altlabel>Marine Realms Information Bank keywords</altlabel></altlabel></thesaurus><term thcode="61" code="449" name="remote sensing" parent="400" scope="generally used for the acquisition of images or other data from aircraft or satellites; also used for ground-based systems for collecting data at a distance."/><bt><term thcode="61" code="400" name="field observation" parent="398" scope="scientific investigation of physical or biological features and processes in a natural setting."/><term thcode="61" code="398" name="research method" parent="1"/><term thcode="61" code="1" name="Marine Realms Information Bank (MRIB) keyword categories"/></bt><nt><term thcode="61" code="459" name="SAR" parent="449" scope="technique that uses radio pulses from a moving platform (typically an aircraft or satellite) to create high-resolution images of a distant target."/><term thcode="61" code="450" name="aerial and satellite photography" parent="449" scope="used for vertical or oblique photography of the Earth taken from aircraft or satellites; do not use for air-to-air photography."/><term thcode="61" code="454" name="atmospheric temperature measurement" parent="449" scope="the indirect measurement of atmospheric temperature, generally from satellites."/><term thcode="61" code="455" name="passive microwave measurement" parent="449" scope="measurement of the microwaves radiated or reflected by the Earth, used to characterize surface features."/><term thcode="61" code="456" name="radar" parent="449" scope="imaging techniques that employ radio waves to measure the reflectance of distant targets."/><term thcode="61" code="457" name="radiometry" parent="449" scope="the measurement of radiant energy from a remote location."/><term thcode="61" code="458" name="reflectance measurement" parent="449" scope="measurement of the reflectance of a surface, generally from satellites."/><term thcode="61" code="460" name="scatterometry" parent="449" scope="the use of a device that emits microwaves and measures the energy reflected by the distant target (&quot;backscatter&quot;)."/><term thcode="61" code="461" name="sea surface temperature measurement" parent="449" scope="the indirect measurement of the surface temperature of the ocean or other large bodies of water, generally from satellites."/></nt></descriptor>