<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="112" name="biogeographic regions" parent="928" scope="Geographic regions characterized chiefly by the dominant forms of plant life and the prevailing climate. [Adapted from American Heritage Dic. of the English Language, 4th ed.]"/><uf><usefor name="biomes"/><usefor name="ecoregions"/><usefor name="vegetation"/></uf><bt><term thcode="3" code="928" name="regions" parent="1" scope="(a) Large, indefinite portions of the earth's surface. (b) Specified districts or territories. (c) Areas of interest or activity; spheres. (d) Ecology. Parts of the earth characterized by distinctive animal or plant life. [Adapted from American Heritage Dic. of the English Language, 4th ed.]"/><term thcode="3" code="1" name="Categories"/></bt><nt><term thcode="3" code="89" name="barren lands" parent="112" scope="Places composed of bare rock, sand, gravel, or other earthen material with little or no vegetation and having limited ability to support life. [USGS Circ 1048]"/><term thcode="3" code="311" name="deserts" parent="112" scope="Regions rendered barren or partially barren by environmental extremes, especially by low rainfall. [USGS Circ 1048]"/><term thcode="3" code="413" name="forests" parent="112" scope="Dense growths of trees, plants, and underbrush covering a large area. [American Heritage Dic. of the English Language, 4th ed.]"/><term thcode="3" code="460" name="grasslands" parent="112" scope="Extensive noncultivated areas where vegetation is dominated by grasses or grass-like plants. [USGS Circ 1048]"/><term thcode="3" code="479" name="habitats" parent="112" scope="Particular environments or places where an organism or species tends to live. [Glossary of Geology, 4th ed.]"/><term thcode="3" code="582" name="jungles" parent="112" scope="Tropical regions of wild, tangled, dense vegetation. [Glossary of Geology, 4th ed.]"/><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.]"/><term thcode="3" code="1038" name="shrublands" parent="112" scope="Areas covered with low-growing or stunted perennial vegetation and usually not mixed with trees. [USGS Circ 1048]"/><term thcode="3" code="1056" name="snow regions" parent="112" scope="(a) Broad expanses of terrain covered with snow, relatively smooth and uniform in appearance, occurring usually at high latitudes or in mountainous regions above the snowline, and persisting throughout the year. (b) Regions of permanent snow cover, as at the heads of glaciers. [Glossary of Geology, 4th ed.]"/><term thcode="3" code="1184" name="tundras" parent="112" scope="Treeless, level, or gently rolling plains characteristic of arctic or subarctic regions, having a permanently frozen subsoil, and usually supporting low growing vegetation such as lichens, mosses, and stunted shrubs. [USGS Circ 1048]"/><term thcode="3" code="1236" name="wetlands" parent="112" scope="Vegetated areas that are inundated or saturated by surface or ground water for a significant part of the year. The vegetation is adapted for life in saturated soil conditions. [USGS Circ 1048]"/></nt><rt><term thcode="3" code="816" name="physiographic features" parent="1"/></rt></descriptor>