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    <dct:description>ASCII xyz point cloud data were produced from remotely-sensed, geographically-referenced elevation measurements in cooperation with the U.S. Geological Survey (USGS) and National Air and Space Administration (NASA). Elevation measurements were collected over the area using the NASA Experimental Advanced Airborne Research Lidar (EAARL), a pulsed laser ranging system mounted onboard an aircraft to measure ground elevation, vegetation canopy, and coastal topography. The system uses high-frequency laser beams directed at the earth's surface through an opening in the bottom of the aircraft's fuselage. The laser system records the time difference between emission of the laser beam and the reception of the reflected laser signal in the aircraft. The plane travels over the target area at approximately 50 meters per second at an elevation of approximately 300 meters. The EAARL, developed by NASA at Wallops Flight Facility in Virginia, measures ground elevation with a vertical resolution of 15 centimeters. A sampling rate of 3 kHz or higher results in an extremely dense spatial elevation data set. Over 100 kilometers of coastline can be easily surveyed within a 3 to 4 hour mission time period. When subsequent elevation maps for an area are analyzed, they provide a useful tool to make management decisions regarding land development. For more information on Lidar science and the Experimental Advanced Airborne Research Lidar (EAARL) system and surveys, see http://ngom.usgs.gov/dsp/overview/index.php and http://ngom.usgs.gov/dsp/tech/eaarl/index.php .</dct:description>
        <dcat:keyword>elevation</dcat:keyword>
        <dcat:keyword>lidar</dcat:keyword>
        <dcat:keyword>experimental advanced airborne research lidar</dcat:keyword>
        <dcat:keyword>eaarl</dcat:keyword>
        <dcat:keyword>digital elevation model</dcat:keyword>
        <dcat:keyword>elevation change</dcat:keyword>
        <dcat:keyword>laser altimetry</dcat:keyword>
        <dcat:keyword>derived surface</dcat:keyword>
        <dcat:keyword>resource management</dcat:keyword>
        <dcat:keyword>alps</dcat:keyword>
        <dcat:keyword>advanced lidar processing system</dcat:keyword>
        <dcat:keyword>hurricanes</dcat:keyword>
        <dcat:keyword>ivan</dcat:keyword>
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    <dct:title>EAARL Coastal Topography-Northern Gulf of Mexico</dct:title>
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            <rdf:value>["The U. S. Geological Survey shall not be held liable for improper or incorrect use of the data described and/or contained herein. These data and related graphics are not legal documents and are not intended to be used as such. The information contained in these data is dynamic and may change over time. The data are not better than the original sources from which they were derived. It is the responsibility of the data user to use the data appropriately and consistent within the limitations of geospatial data in general and these data in particular. The related graphics are intended to aid the data user in acquiring relevant data; it is not appropriate to use the related graphics as data. The U. S. Geological Survey gives no warranty, expressed or implied, as to the accuracy, reliability, or completeness of these data. It is strongly recommended that these data are directly acquired from a U. S. Geological Survey server and not indirectly through other sources which may have changed the data in some way. Although these data have been processed successfully on a computer system at the U. S. Geological Survey, no warranty expressed or implied is made regarding the utility of the data on another system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. This disclaimer applies both to individual use of the data and aggregate use with other data."]</rdf:value>
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            <rdf:value>["Use Constraints: The U.S. Geological Survey and National Aeronautics and Space Administration request to be acknowledged as originators of the data in future products or derivative research.", "Access Constraints: None"]</rdf:value>
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            <rdf:value>USGS Coastal and Marine Geoscience Data System</rdf:value>
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