<descriptor thcode="3"><thesaurus thcode="3" name="Alexandria Digital Library Feature Type Thesaurus" scope="Types of named geographic features.  Applicable also to many unnamed features but reflects the level of detail traditionally shown on maps, so some feature types specified in scientific studies may not be well represented here.  Not highly specific." creator="Alexandria Digital Library Project, University of California at Santa Barbara" rights="Copyright (c) 1999-2004 by the Regents of the University of California. All rights reserved.\r\n\r\nRedistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:\r\n\r\n   1. Redistributions of source code or dataset must retain the above copyright notice, this list of conditions and the following disclaimer.\r\n   2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.\r\n   3. Neither the name of the University of California, Santa Barbara nor the names of its contributors may be used to endorse or promote products derived from this software or dataset without specific prior written permission.\r\n\r\nTHIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS &quot;AS IS&quot; AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE OR DATASET, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.\r\n\r\n[This statement is derived from the BSD license template, http://www.opensource.org/licenses/bsd-license.php]" edition="2.0" date="2002-07-03" codetype="number" prefix="feature" uri="http://www.usgs.gov/science/ADLFeatureType" tblname="feature" nonpref="featnp" relterm="featrt" root_code="1" contact="pschweitzer"><category><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="16" name="hierarchical" parent="11" scope="Substantive broader-narrower relationships exist among the terms."/><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="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="16" name="hierarchical" parent="11" scope="Substantive broader-narrower relationships exist among the terms."/><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."/></category><altlabel><altlabel>ADLFTT</altlabel><altlabel>ADLFTT</altlabel><altlabel>ADLFeatureType</altlabel><altlabel>ADLFeatureType</altlabel></altlabel></thesaurus><term thcode="3" code="525" name="hydrographic features" parent="1" scope="For natural bodies of water. For constructed waterways, reservoirs, and such, use 'hydrographic structures'."/><uf><usefor name="bodies of water"/><usefor name="eddies"/><usefor name="fluvial features"/><usefor name="marine features"/><usefor name="overfalls"/><usefor name="upwellings"/><usefor name="water bodies"/><usefor name="waterholes"/><usefor name="whirlpools"/></uf><bt><term thcode="3" code="1" name="Categories"/></bt><nt><term thcode="3" code="48" name="aquifers" parent="525" scope="Bodies of rock that contain sufficient saturated permeable material to conduct ground water and to yield significant quantities of water to  wells and springs. [Glossary of Geology, 4th ed.]"/><term thcode="3" code="100" name="bays" parent="525" scope="Indentations of a coastline or shoreline enclosing a part of a body of water; bodies of water partly surrounded by land. [USGS GNIS Feature Class Definitions &lt;http://geonames.usgs.gov/domestic/feature_class.htm&gt;]"/><term thcode="3" code="189" name="channels" parent="525" scope="(a) Relatively narrow seas or stretches of water between two close landmasses and connecting two larger bodies of water; (b) Deeper parts of a moving body of water (as bays, estuaries, or straits) through which the main current flows or which affords the best passage through an area otherwise too shallow to navigate. [Glossary of Geology, 4th ed.]"/><term thcode="3" code="331" name="drainage basins" parent="525" scope="Regions or areas bounded by drainage divides and occupied by drainage systems; specifically the tract of country that gathers water originating as precipitation and contributes it to a particular stream channel or system of channels, or to a lake, reservoir, or other body of water. [Glossary of Geology, 4th ed.]"/><term thcode="3" code="361" name="estuaries" parent="525" scope="Regions of interaction between rivers and near-shore ocean waters, where tidal action and river flow mix fresh and salt water. These brackish water ecosystems shelter and feed marine life, birds, and wildlife.. [EPA Terms of Environment &lt; http://www.epa.gov/OCEPAterms/&gt;]"/><term thcode="3" code="401" name="floodplains" parent="525" scope="Flat or nearly flat land along a river or stream or in a tidal area that is covered by water during a flood. [EPA Terms of Environment &lt;http://www.epa.gov/OCEPAterms/&gt;]"/><term thcode="3" code="473" name="gulfs" parent="525" scope="Largest of various forms of inlets of the sea; usually larger, more enclosed, and more deeply indented than bays. [Glossary of Geology, 4th ed.]"/><term thcode="3" code="476" name="guts" parent="525" scope="Relatively small coastal waterways connecting larger bodies of water or other waterways. [USGS Feature Class Definitions &lt;http://geonames.usgs.gov/domestic/feature_class.htm&gt;]"/><term thcode="3" code="529" name="ice masses" parent="525" scope="Fields of ice, formed in regions of perennial frost. [USGS Circ 1048]"/><term thcode="3" code="596" name="lakes" parent="525" scope="Natural inland bodies of standing water, generally of appreciable size, occupying a depression in the Earth's surface. [Adapted from Glossary of Geology, 4th ed.]"/><term thcode="3" code="1015" name="seas" parent="525" scope="Large bodies of salt water. [USGS Feature Class Definitions &lt;http://geonames.usgs.gov/domestic/feature_class.htm&gt;]"/><term thcode="3" code="1096" name="streams" parent="525" scope="Linear bodies of water flowing on the Earth's surface. [USGS Feature Class Definitions &lt;http://geonames.usgs.gov/domestic/feature_class.htm&gt;]"/><term thcode="3" code="1149" name="thermal features" parent="525" scope="Holes in the Earth's crust from which hot water and steam (geysers), and gases and vapors (fumaroles) are emitted. [Adapted from USGS Circ 1048 and Glossary of Geology, 4th ed.]"/></nt><rt><term thcode="3" code="526" name="hydrographic structures" parent="643" scope="For constructed bodies of water. For natural water bodies, use 'hydrographic features'."/><term thcode="3" code="747" name="oases" parent="112" scope="Fertile, vegetated areas in the midst of a desert, where the water table has come close enough to the surface for wells and springs or seepages to exist, thus making them suitable for human habitation. [Glossary of Geology, 4th ed.]"/></rt></descriptor>