<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="95" name="basins" parent="816" scope="Bowl-shaped, natural depressions in the surface of the land or ocean floor. [Adapted from USGS Circ 1048]"/><uf><usefor name="asphalt lakes"/><usefor name="depressions"/><usefor name="pans (geologic)"/></uf><bt><term thcode="3" code="816" name="physiographic features" parent="1"/><term thcode="3" code="1" name="Categories"/></bt><nt><term thcode="3" code="1085" name="storage basins" parent="95" scope="Basins in which drainage water is naturally detained. [Adapted from Glossary of Geology, 4th ed.]"/></nt><rt><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="200" name="cirques" parent="816" scope="Bowl-like hollows partially surrounded by cliffs or steep slopes at the head of a glaciated valley. [NIMA GEONet Designation ... Definitions &lt;http://164.214.2.59/gns/html/desig.html&gt;]"/><term thcode="3" code="285" name="craters" parent="816" scope="Circular-shaped depressions at the summit of a volcanic core or on the surface of the land caused by the impact of a meteorite; man-made depressions caused by an explosion. [USGS GNIS Feature Class Definitions &lt;http://geonames.usgs.gov/domestic/feature_class.htm&gt;]"/><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="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="686" name="mineral deposit areas" parent="816" scope="Areas where masses of naturally occurring mineral material are found, e.g. metal ores or nonmetallic minerals. [Adapted from Glossary of Geology, 4th ed.]"/><term thcode="3" code="835" name="playas" parent="816" scope="Closed depressions in an arid or semi-arid region that are periodically inundated by surface runoff, or the salt flat within such a closed basin.[Encyc. Dictionary of Physical Geography]"/><term thcode="3" code="1123" name="synclines" parent="406" scope="Trough-shaped folds or downfolds in folded rock strata, the strata dipping towards a central axis.  [Macmillan Encyc., 2001]"/><term thcode="3" code="1197" name="valleys" parent="816" scope="Low-lying land bordered by higher ground; especially elongate, relatively large gently sloping depressions of the Earth's surface, commonly situated between two mountains or between ranges of hills or mountains, and often containing a stream with an outlet. [Glossary of Geology, 4th ed.]"/></rt></descriptor>