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    <dct:description>Bear Lake is a tectonic lake that has existed for at least several hundred thousand years. The lake basin is a relatively simple half graben, a spoon-shaped depression tilted toward the main fault on the east side of the lake. The U.S. Geological Survey, in cooperation with researchers from several universities, has been studying the sediments of Bear Lake since 1996. The general purpose of this effort is to reconstruct past limnological conditions and regional climate on a range of timescales, from hundreds of years to hundreds of thousands of years. This research relates to a variety of human concerns, including water usage in the Bear River basin. Past work has included several coring operations, a seismic-reflection survey, sediment-trap deployments, a barge-mounted drilling operation with the GLAD800 drill rig, and a variety of other studies. The objectives of the September, 2002 operations, preliminarily reported here, were (1) to compile a detailed bathymetric map of the lake using swath-mapping techniques, in order to provide baseline data for a variety of applications and studies, and (2) to complete a sidescan-sonar survey of the lake, providing a nearly complete acoustic image of the lake floor. Limited amounts of subbottom acoustic-reflection data (chrip) were also collected, along with samples of lake-floor sediments representative of different kinds of backscatter patterns. These surveys followed an earlier subbottom acoustic-reflection survey (1997), using boomer and 3.5 kHz systems (S. M. Colman, unpublished data).</dct:description>
        <dcat:keyword>bathymetry</dcat:keyword>
        <dcat:keyword>swath bathymetry</dcat:keyword>
        <dcat:keyword>interferometry</dcat:keyword>
        <dcat:keyword>u.s. geological survey</dcat:keyword>
        <dcat:keyword>usgs</dcat:keyword>
        <dcat:keyword>coastal and marine geology program</dcat:keyword>
        <dcat:keyword>cmgp</dcat:keyword>
        <dcat:keyword>woods hole field center</dcat:keyword>
        <dcat:keyword>bear lake</dcat:keyword>
        <dcat:keyword>utah</dcat:keyword>
        <dcat:keyword>idaho</dcat:keyword>
        <dcat:keyword>western lakes</dcat:keyword>
        <dcat:keyword>north america</dcat:keyword>
        <dcat:keyword>united states</dcat:keyword>
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    <dct:identifier>bathygrd-tif-geophysical-surveys-of-bear-lake-utah-idaho-september-2002-bathymetric-grid</dct:identifier>
    <dct:title>BATHYGRD.TIF - Geophysical Surveys of Bear Lake, Utah-Idaho, September 2002 - Bathymetric Grid</dct:title>
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                <dcat:accessURL rdf:resource="http://pubs.usgs.gov/of/2003/of03-150"></dcat:accessURL>
               <dct:title>Web Page</dct:title>
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            <rdfs:label>contact-email</rdfs:label>
            <rdf:value>jdenny@usgs.gov</rdf:value>
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            <rdfs:label>metadata-date</rdfs:label>
            <rdf:value>2002-01-19</rdf:value>
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          <rdf:Description>
            <rdfs:label>licence</rdfs:label>
            <rdf:value>["Altough this data set and its lineage have been used by the USGS, no warranty, expressed or implied, is made by the USGS as to the accuracy of the data and/or it's related materials. The act of distribution shall not constitute any such warranty, and no resposibility is assumed by the USGS in the use of these data or related items. Users must assume resposibility for the proper use of this data. This data should not be used at resolutions for which it is not intended. This data has no been reviewed for conformity with U.S. Geological Survey editorial standards, or the North American Strigraphic code. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the US Government."]</rdf:value>
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            <rdf:value>["Use Constraints: Bathymetry is not to be used for navigational purposes. The USGS asks to be referenced in any use of these data.", "Access Constraints: None."]</rdf:value>
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            <rdfs:label>harvest_source_title</rdfs:label>
            <rdf:value>U.S. Geological Survey Coastal Map</rdf:value>
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