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    <dct:description>There are critical needs for a nationwide compilation of reliable shoreline data. To meet these needs, the U.S. Geological Survey (USGS) has produced a comprehensive database of digital vector shorelines by compiling shoreline positions from pre-existing historical shoreline databases and by generating historical and modern shoreline data. Shorelines are compiled by state and generally correspond to one of four time periods: 1800s, 1920s-1930s, 1970s, and 1998-2002. Each shoreline may represent a compilation of data from one or more sources for one or more dates provided by one or more agencies. Details regarding source are provided in the 'Data Quality Information' section of this metadata report. Shoreline vectors derived from historic sources (first three time periods) represent the high water line at the time of the survey, whereas modern shorelines (final time period) represent the mean high water line.</dct:description>
        <dcat:keyword>shoreline</dcat:keyword>
        <dcat:keyword>historic shoreline</dcat:keyword>
        <dcat:keyword>shoreline change rate</dcat:keyword>
        <dcat:keyword>linear regression rate</dcat:keyword>
        <dcat:keyword>endpoint rate</dcat:keyword>
        <dcat:keyword>baseline</dcat:keyword>
        <dcat:keyword>beach erosion</dcat:keyword>
        <dcat:keyword>beach nourishment</dcat:keyword>
        <dcat:keyword>lidar</dcat:keyword>
        <dcat:keyword>t-sheet</dcat:keyword>
        <dcat:keyword>tp-sheet</dcat:keyword>
        <dcat:keyword>coastal survey map</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>esri polyline shapefile</dcat:keyword>
        <dcat:keyword>oceans</dcat:keyword>
        <dcat:keyword>oceans and estuaries</dcat:keyword>
        <dcat:keyword>oceans and coastal</dcat:keyword>
        <dcat:keyword>elevation</dcat:keyword>
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    <dct:identifier>norcal1952-1971-vectorized-shoreline-of-northern-california-derived-from-1952-1971-source-data</dct:identifier>
    <dct:title>NORCAL1952_1971 - Vectorized Shoreline of Northern California Derived from 1952-1971 Source Data</dct:title>
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        <dcat:distribution>
            <dcat:Distribution>
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               <dct:title>Web Page</dct:title>
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        <dcat:distribution>
            <dcat:Distribution>
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        <dcat:distribution>
            <dcat:Distribution>
                <dcat:accessURL rdf:resource="http://pubs.usgs.gov/of/2006/1251/"></dcat:accessURL>
               <dct:title>Web Page</dct:title>
            </dcat:Distribution>
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        <dcat:distribution>
            <dcat:Distribution>
                <dcat:accessURL rdf:resource="http://pubs.usgs.gov/of/2006/1219/"></dcat:accessURL>
               <dct:title>Web Page</dct:title>
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            <rdfs:label>temporal-extent-begin</rdfs:label>
            <rdf:value>1945-01-01</rdf:value>
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            <rdfs:label>temporal-extent-end</rdfs:label>
            <rdf:value>1976-01-01</rdf:value>
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            <rdfs:label>metadata-language</rdfs:label>
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            <rdfs:label>bbox-west-long</rdfs:label>
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          <rdf:Description>
            <rdfs:label>metadata-date</rdfs:label>
            <rdf:value>2007-03-01</rdf:value>
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          <rdf:Description>
            <rdfs:label>dataset-reference-date</rdfs:label>
            <rdf:value>[{"type": "publication", "value": "2006-01-01"}]</rdf:value>
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            <rdfs:label>bbox-east-long</rdfs:label>
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          <rdf:Description>
            <rdfs:label>spatial-reference-system</rdfs:label>
            <rdf:value></rdf:value>
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          <rdf:Description>
            <rdfs:label>bbox-north-lat</rdfs:label>
            <rdf:value>42.000012</rdf:value>
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            <rdfs:label>bbox-south-lat</rdfs:label>
            <rdf:value>38.232334</rdf:value>
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          <rdf:Description>
            <rdfs:label>licence</rdfs:label>
            <rdf:value>["\nAlthough these data have been used by the U.S. Geological Survey, U.S. Department of the Interior, these data and information are provided with the understanding that they are not guaranteed to be usable, timely, accurate, or complete. Users are cautioned to consider carefully the provisional nature of these data and information before using them for decisions that concern personal or public safety or the conduct of business that involves substantial monetary or operational consequences. Conclusions drawn from, or actions undertaken on the basis of, such data and information are the sole responsibility of the user.\n\nNeither the U.S. Government nor any agency thereof, nor any of their employees, contractors, or subcontractors, make any warranty, express or implied, nor assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any data, software, information, apparatus, product, or process disclosed, nor represent that its use would not infringe on privately owned rights.\n\nTrade, firm, or product names and other references to non-USGS products and services are provided for information only and do not constitute endorsement or warranty, express or implied, by the USGS, USDOI, or U.S. Government, as to their suitability, content, usefulness, functioning, completeness, or accuracy.\n"]</rdf:value>
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            <rdfs:label>guid</rdfs:label>
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          <rdf:Description>
            <rdfs:label>spatial-data-service-type</rdfs:label>
            <rdf:value></rdf:value>
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        <dct:relation>
          <rdf:Description>
            <rdfs:label>access_constraints</rdfs:label>
            <rdf:value>["Use Constraints: This data set is not to be used for navigational purposes. Public domain data from the U.S. government are freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey (USGS) as the source of this information.", "Access Constraints: None"]</rdf:value>
          </rdf:Description>
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          <rdf:Description>
            <rdfs:label>frequency-of-update</rdfs:label>
            <rdf:value>notPlanned</rdf:value>
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          <rdf:Description>
            <rdfs:label>harvest_object_id</rdfs:label>
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          <rdf:Description>
            <rdfs:label>harvest_source_title</rdfs:label>
            <rdf:value>U.S. Geological Survey Coastal Map</rdf:value>
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  </dcat:Dataset>
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